Friday 23 February 2018

2nd Year Chemistry Important MCQs solved

2nd Year Chemistry Important MCQs solved
If you are in the need of 12th class chemistry mcqs solved which are important then you are at the right page because here we have written the all 2nd Year Chemistry Important MCQs solved.


  1. The number of electrons in one coulomb charge is equal to:
a.       (a) 6.2 x 1018               (b) 1.6 x 10-19              (c) zero                                    (d) 6.2 x 1021
  1. The value of  for various dielectrics is always:
a.       (a) less than unity        (b) equal to unity         (c) larger than unity     (d) none of these
  1. The electric field cannot deflect:
a.       (a) x-rays                     (b) -particles                        (c) -particles                        (d) electron
  1. The potential of all the points of eqvi-potential planes is:
a.       (a) same                       (b) zero                                    (c) different                 (d) infinite
  1. The graphical representation of ohm’s law is:
a.       (a) hyperbola               (b) ellipse                     (c) parabola                 (d) straight line
  1. The resistance of a meter cube of the substance is called:
a.       (a) conductivity                       (b) permittivity                        (c) resistivity               (d) none of these
  1. The conductance of a conductor increases when:
a.       (a) its temperature increases                            (b) its temperature decreases
b.      (c) its length increases                                     (d) none of these
  1. The amount of work done per coulomb of the charge passing though a conductor is:
a.       (a) I2R                         (b) VI                          (c) V                            (d) VQ
  1. Semi conductor diode is an example of:
a.       (a) non-ohmic device  (b) ohmic device         (c) insulator                 (d) none of these
  1. By increasing the thickness of a wire, its resistance will:
a.       (a) increase                  (b) decrease                 (c) remains same          (d) become zero
  1. Whenever current is drawn from a cell, its terminal potential difference and emf become:
a.       (a) different                 (b) same                       (c) zero                                    (d) negative
  1. The reciprocal of conductance of a conductor is:
a.       (a) conductivity                       (b) resistivity               (c) resistance               (d) capacitance
  1. The motional emf developed in a conductor depends upon:
a.       (a) length                     (b) orientation             (c) magnetic filed        (d) all of these
  1. One henry is equal to:
a.       (a) VS-1A                     (b) NmA-1                    (c) V-1SA                     (d) VSA-1
  1. The unit of electric intensity is:
a.       (a) N/C                                    (b) C/N                                    (c) N                            (d) Dynes
  1. Electric flux is minimum when B is:
a.       (a) Parallel to A           (b) Perpendicular to A            (c) Antiparallel to A    (d) None of these
  1. Work done per unit charge is called:
a.       (a) electric flux                        (b) electric intensity    (c) electric potential    (d) none of these
  1. The unit of electric current is:
a.       (a) impere                    (b) newton                  (c) NC-1                       (d) VA-1
  1. The drift velocity of electrons is:
a.       (a) 103ms-1                  (b) 333ms-1                  (c) 3x108ms-1               (d) 10-3ms-1
  1. The force on an electron in a field of 108 N/c will be:
a.       (a) 1.6 x 10-8 N                        (b) 1.6 x 10-9N             (c) 1.6 x 10-10 N           (d) 1.6 x 10-11 N
  1. Electric potential is a:
a.       (a) Vector quantity      (b) Scalar quantity       (c) Both (a) & (b)        (d) None of these
  1. The electric intensity at infinite distance from the point charge will be:
a.       (a) Positive                  (b) Zero                       (c) Infinite                   (d) Negative
  1. The intensity of electric field between two oppositely charged parallel plates close to each other is:
a.       (a)                       (b)                     (c)                   (d)
  1. The S.I unit of the temperature co-efficient of resistivity of a material is:
a.       (a) Ohm – m                (b) K                            (c) K-1                          (d) Ohm – k
  1. The resistance of a conductor at absolute zero (K) is:
a.       (a) Zero                       (b) Infinite                   (c) Positive                  (d) Negative
  1. Heat generated by a 40 watts bulb in one hour is:
a.       (a) 4800J                     (b) 14400J                   (c) 144000J                 (d) 1440J
  1. Which one of the following bulbs has the least resistance:
a.       (a) 100 watt                 (b) 200 watt                (c) 500 watt                 (d) 1000 watt
  1. When a charged particle moves through a magnetic field, the effect of the field changes the particle’s:
a.       (a) Speed                     (b) Mass                      (c) Energy                   (d) Direction of motion
  1. The magnetic induction is also called:
a.       (a) Flux                        (b) Magnetic intensity             (c) Flux density           (d) Magnetization
  1. Two parallel wires carrying currents in the opposite directions:
a.       (a) Repel each other    (b) Attract each other  (c) Both (a) and (b)     (d) None of these
  1. In order to increase the range of an ammeter the shunt resistance is:
a.       (a) Decreased              (b) Increased                (c) Kept constant        (d) None of these
  1. The magnetic force on an electron traveling with 108 ms-1 parallel to a field of strength 1 Weber m2 is:
a.       (a) 105N                      (b) 10-10N                    (c) 108N                       (d) Zero
  1. The magnetic force is:
a.       (a) Restoring force      (b) Lorentz force         (c) Deflecting force     (d) All of these
  1. Identify the instrument which can be used to find potential difference:
a.       (a) potentiometer          (b) digital voltmeter   (c) CRO                      (d) All of these
  1. The maximum output power of a certain e.m.f source is given by:
a.       (a)Pout = E2 R/4r        (b) Pout = E/4r            (c) Pout =            (d) Pout =
  1. The letter ‘3k9k’ unscribed on a resistance means:
a.       (a) 3.9           (b) 1.9                   (c) 39            (d) 3.9kk
  1. CRO practically draws:
a.       (a) very large amount of current                     (b) finite amount of current
b.      (c) No current                                                  (d) May draw either a large or small current
  1. For an open circuit the current following through the circuit will be:
a.       (a) infinite                   (b) finite                      (c) maximum               (d) zero
  1. For an open circuit:
a.       (a) E = Vt                    (b) E > Vt                    (c) E<Vt                      (d) E = Vt + Ir
  1. Terminal potential Vt of a working circuit is = :
a.       (a) E – I/r                    (b) E + I/r                    (c) Ir – E                      (d) E – Iv
  1. Unit of e.m.f is:
a.       (a) joule                       (b) coulomb                 (c) volt                         (d) watt
  1. One of the practical application of electrostatic induction is:
a.       (a) Laser                       (b) X – ray machine   (c) photo copier           (d) All of these
  1. For air the value of  is equal to:
a.       (a) 2                             (b) 1.006                      (c) 78.5                                    (d) 2.94
  1. Another name of dielectric is:
a.       (a) conductor               (b) insulator                 (c) substance               (d) super conductor
  1. S.I unit of permittivity of free space is:
a.       (a) C2/Nm2                   (b) Nm2/ C2                 (c) Newton                  (d) dynes
  1. Electric flux is given by the expression:
a.       (a) =                   (b) =                  (c)  = F/q                  (d)  =
  1. The ratio of e/m of an electron is:
a.       (a) 1.7588  1011c/kg  (b) 1.750810-11 c/kg  (c) 1.675010-27 c/kg  (d) 9.104510-31 c/kg
  1. The expression of  a single charge sheet is:
a.       (a) /                    (b) /2                   (c) q/                       (d) q/2
  1. The energy stored on the capacitor is:
a.       (a) K.E                        (b) P.E                         (c) Electrical K.E        (d) Electrical P.E
  1. A
    Type
     
    When resistance is increased in a series LCR circuit:
a.       (a) Impedance increases          (b) Reactance increases           (c) Phase angle increases         (d) Phase angle decreases
  1. The reactance of an inductor depends upon:
a.       (a) L                            (b) wL                         (c) w                            (d) All of these
52.  A device that allows only continuous flow of A.C through a circuit is:
a.       (a) Capacitor               (b) Inductor                 (c) Dynamo                 (d) D.c motor
  1. As a result of modulation, resultant wave is known as:
a.       (a)  Energetic carrier waves                             (b) Carries waves
b.      (c) Modulated carries wave                            (d) None of these
  1. B
    Type
     
    In a resistive A.C circuit, instantaneous values of voltage & current are:
a.       (a) In phase                 (b) Out of phase                      (c) Lead each other     (d) None of these
  1. At what frequency 1 Henry inductance offer same impendence as 1F capacitor:
a.       (a) Hz                    (b) Hz                    (c) 1 KHz                    (d) None of these
56.  The measure of opposition offered by capacitor to flow of A.C called:
a.       (a) reactance                (b) Resistance              (c) Impedance                         (d) Capacitance
  1. The reactance of a coil depends upon:
a.       (a)  Inductance of coil             (b) Capacitance of coil            (c) Thickness of coil    (d) None of these
  1. C
    Type
     
    When A.C voltage is applied to an inductor the:
a.       (a) Voltage v leads current I by 90o                            (b) Voltage v leads current I by 270o
b.      (c) Voltage v leads current I by 0o                              (d) None of these
  1. Inductive reactance  of a coil is expressed in:
a.       (a) ohm                                    (b) Ampere                  (c) Volt                                    (d) None of these
60.  In an R.L.C series circuit, the quantities which are directed opposite to each other are:
a.       (a) Xc & R                   (b) Xc & XL                 (c) Xc & L                   (d) XL & C
  1. Power factor is defined by:
a.       (a)  Cos                    (b) Sin                      (c) tan                                  (d) Sec
  1. Bohr’s postulate explained by:
a.       (a) de-Broglie              (b) Einstein                  (c) Compton                (d) Rutherford
  1. The process of formation of spectrum is known as:
a.       (a) diffraction              (b) interferences          (c) refraction               (d) spectroscopy
  1. An electron of the hydrogen atom in the second orbit, is called its:
a.       (a) ground state           (b) ionized state          (c) excited state           (d) none of these
  1. Electromagnetic rays which lies above the x-rays region are called:
a.       (a) -rays                                                        (b) infrared radiations
b.      (c) ultraviolet radiation                                   (d) none of these
  1. The orbital speed of an electron in the nth orbit is:
a.       (a)            (b)                         (c)            (d) none of these
  1. If the ionization energy of hydrogen atom is 136ev, its ionization potential will be:
a.       (a) 13.6v                      (b) 3v                           (c) 4v                           (d) none of these
  1. The energy of the 4th orbit in hydrogen atom is:
a.       (a) -2.51ev                   (b) -3.50ev                   (c) -0.85ev                   (d) -5.25ev
  1. Lasers can be produced by:
a.       (a) solid lasers                                     (b) solid and liquid lasers
b.      (c) gas lasers                                                    (d) all of these
  1. The strong nuclear force is between:
a.       (a) hadrons                  (b) muons                    (c) leptons                   (d) none of these
  1. Mass defect per nucleon is called:
a.       (a) binding energy of nucleus             (b) packing fraction
b.      (c) average energy of nucleus             (d) none of these
  1. 0.1Kg mass will be equivalent to the energy:
a.       (a) 5x108J                    (b) 6x1016J                   (c) 9x1016J                   (d) 9x1015J
  1. The minimum energy required by a photon to create an electron positron pair is:
a.       (a) 3MeV                     (b) 4MeV                    (c) 1.02MeV                (d) 1.5MeV
  1. The rest mass of a photon is:
a.       (a) zero                                    (b) 1.67x10-27Kg         (c) 9.1x10-31Kg                        (d) 1.67x10-31Kg
  1. The platinum wire becomes yellow at a temperature:
a.       (a) 1100oC                   (b) 500oC                     (c) 1300oC                   (d) 1600oC
  1. If speed of light were infinite then moving mass m=:
a.       (a)                            (b) 0                             (c) mo                           (d) 2mo
  1. The radiations emitted from hydrogen filled discharge tube shows:
a.       (a) band spectrum       (b) line spectrum         (c) continuous spectrum          (d) absorption spectrum
  1. Life time of excited states (meta stable) is:
a.       (a) 10-5s                       (b) 10-3s                       (c) 10-8s                       (d) 10-4s
  1. The velocity of electron in ground state of hydrogen atom is:
a.       (a) 2x106ms-1               (b) 2x107m/s                (c) 2x108ms-1               (d) 2x109ms-1
  1. In the sate n= of hydrogen atom, total energy of electron is:
a.       (a) 5.2ev                      (b) 9.8ev                      (c) zero                                    (d) 10.5ev
  1. Chadwick discovered neutron by the study of scattering of alpha particles from:
a.       (a) gold foil                 (b) nitrogen                 (c) beryllium                (d) oxygen
  1. Mass of neutron is:
a.       (a) 1.6x10-31Kg                        (b) 1.67x10-27Kg         (c) 9.1x10-31Kg                        (d) 1.67x10-19Kg
  1. A curie represents a very strong source of:
a.       (a) -particle              (b) -particle              (c) -particles             (d) all of these
  1. Various types of cancer are treated by:
a.       (a) cobalt-60                (b) strontium-90          (c) carbon-14               (d) nickel-63
  1. Anti-proton was discovered by:
a.       (a) Anderson               (b) Chadwick              (c) J.J.Thomson                       (d) Newton
  1. During electrolysis process, density of CuSO4 solution:
a.       (a) remains constant                            (b) decreased
b.      (c) increased                                                    (d) none of these
  1. The value of the resistivity is the least for:
a.       (a) silver                      (b) aluminium  (c) copper                    (d) all of these
  1. A voltmeter can read the correct potential difference only when the current drawn by it from the cell is:
a.       (a) smaller                   (b) greater                   (c) nearly zero (d) none of these
  1. If the resistor is traversed in the direction of current, the potential change are:
a.       (a) negative                 (b) positive                  (c) constant                 (d) zero
  1. The current passing through galvanometer is directly proportional to:
a.       (a) angle of deflection                                    (b) magnetic field
b.      (c) number of turns                                         (d) resistance of the coil
  1. If the magnetic flux is expressed in Weber, then the magnetic induction can be expressed as:
a.       (a) weber/m                 (b) weber/m2   (c) m2/weber                (d) weber/m3
  1. If a charge is free to move in an electric field, the acceleration produced in it will be:
a.       (a)                   (b)                (c)                  (d)
  1. The self induction does not depend upon:
a.       (a) core material                                              (b) weight of coil
b.      (c) number of turns of the coil                        (d) area of coil
  1. D.C is converted into A.C by:
a.       (a) dynamo                  (b) rectifier                  (c) oscillator                (d) transformer
  1. In case of a motor, if V is the applied emf and  is the back emf then the net emf in the circuit is:
a.       (a) V-                       (b) V+                      (c) Vx                       (d) /V
  1. Resistivity of a material depends upon its:
a.       (a) length                     (b) area of cross section          (c) conductivity                       (d) reactance
  1. The resistance of a conductor at absolute zero is:
a.       (a) zero                                    (b) infinite                   (c) positive                  (d) negative
  1. The basic circuit element in a D.C circuit which controls the current or voltage is:
a.       (a) inductor                 (b) resistor                   (c) capacitor                (d) all of these
  1. Power dissipated in a pure inductor is:
a.       (a) large                       (b) small                      (c) infinite                   (d) zero
  1. If the value of C in a series RLC circuit is increased, the resonance frequency:
a.       (a) increases                 (b) decreases               (c) remains the same    (d) become infinite
  1. The electric field, magnetic field and direction of propagation of electromagnetic waves are mutually:
a.       (a) parallel                   (b) antiparallel             (c) orthogonal              (d) rectangular
  1. The graph between time and voltage is known as:
a.       (a) cosine curve                       (b) sine curve               (c) tangent curve         (d) varying curve
  1. Electromagnetic waves emitted from antenna are:
a.       (a) transverse               (b) longitudinal                       (c) stationary               (d) all of these
  1. The most suitable metal for making permanent magnetic is:
a.       (a) Fe                           (b) Al                           (c) Cu                          (d) Steel
  1. Which one exhibit good strength to weight ratio:
a.       (a) crystal                    (b) amorphous             (c) polymeric               (d) metals
  1. The dimension of strain is:
a.       (a) [T]                          (b) [Mo]                       (c) [LT-1]                      (d) [M]
  1. The critical temperature for lead is:
a.       (a) 7.2k                                    (b) 4.2k                                    (c) 1.18k                      (d) 3.72k
  1. The basic region of transistor is:
a.       (a) base                                    (b) collector                 (c) emitter                    (d) all of these
  1. Digital system deals with variables which has only:
a.       (a) two discrete           values                                      (b) three discrete values
b.      (c) four discrete values                                                (d) none of these
  1. The word “Xerography” means:
a.       (a) to take photograph                         (b) dry writing
b.      (c) writing by machine                                    (d) to point something
  1. The impedance of the circuit at resonance frequency in RLC series circuit is:
a.       (a) minimum                (b) maximum               (c) zero                        (d) one
  1. The basic circuit element in a D.C circuit is:
a.       (a) an inductor (b) a resistor                (c) a capacitor  (d) a battery
  1. Which type of solids have definite melting point:
a.       (a) crystalline solid                                          (b) amorphous solid
b.      (c) crystalline solid and amorphous solid
c.       (d) none of these
  1. A well known example of an intrinsic semi-conductor is:
a.       (a) germanium (b) phosphorus            (c) aluminium  (d) cobalt
  1. In n-type material, the minority carriers are:
a.       (a) free electrons         (b) holes                      (c) proton                    (d) mesons
  1. The reactance of inductor is equal to:
a.       (a)                       (b)                         (c)                                     (d)
  1. The unit of capacitance is:
a.       (a) Coulomb                (b) Farad                     (c) Joule                       (d) Watt
  1. The peak value of A.C voltage is called:
a.       (a) maximum voltage                          (b) rms voltage
b.      (c) both ‘a’ and ‘b’                                          (d) none of these
  1. Coulomb’s electrostatic force is:
a.       (a) conservative                                               (b) non-conservative
b.      (c) gravitational                                               (d) all of these
  1. Since selenium becomes conductor in light, so it is called:
a.       (a) photo cell               (b) photo diode                       (c) photo tube              (d) photo conductor
  1. The electron energy is one electron volt when it is accelerated through a potential difference of:
a.       (a) one volt                  (b) one joule                (c) one coulomb          (d) one erg
  1. The potential of all the points of equipotential plane:
a.       (a) same                       (b) zero                        (c) different                 (d) infinite
  1. The absolute potential at a point distance 20cm from a charge of 2 is:
a.       (a) 9x102V                   (b) 9x103V                  (c) 9x104V                   (d) 9x105V
  1. The brightness of the spot on CRO screen is controlled by:
a.       (a) cathode                  (b) anode                     (c) grid                                    (d) filament
  1. A 5 meter wire carrying a current of 2A is at right angles to the uniform magnetic field of 0.5 weber/m2. The force on the wire is:
a.       (a) 2N                          (b) 4N                          (c) 5N                          (d) 1.5N
  1. Cathode ray oscilloscope works by deflecting beam of:
a.       (a) neutrons                 (b) electrons                (c) photons                  (d) positrons
  1. The magnetic force on an electron traveling with 108ms-1 parallel to a field of strength 1 weber/m2 is:
a.       (a) 105N                       (b) 10-10N                    (c) 108N                       (d) zero
  1. A magnetic compass will be deflected if it is kept near a:
a.       (a) rest charge              (b) moving charge       (c) +ve rest charge       (d) none of these
  1. The product of induced current and resistance is:
a.       (a) lesser                      (b) greater                    (c) constant                 (d) none of these
  1. When a charged particle is projected along x-y path to a uniform B, its trajectory is:
a.       (a) Ellipse                    (b) Helix                      (c) Cycloid                  (d) Circle
  1. If coil is wound on an iron core, the flux through it will:
a.       (a) decrease                 (b) become zero           (c) increase                  (d) remain the same
  1. If the motor is overloaded, then the magnitude of back emf is:
a.       (a) increases                 (b) remains constant    (c) zero                                    (d) none of these
  1. Non inductive resistances are used in:
a.       (a) resistance boxes     (b) ammeters               (c) voltmeters              (d) all of these
  1. The value of Coulomb’s constant K depends upon
(a)    The system of units used
(b)   Medium between the charges
(c)    Quantity of the charges
(d)   The system of units and the medium between the charges.
  1. The coulomb’s force in a medium of relative permittivity is given by
a.       (a)                 (b)                (c)                         (d)
  1. The magnitude of the electric intensity at a point near an infinite sheet of positive charge is
a.       (a)                  (b)                (c)                 (d)
  1. The amount of energy equal to 1.6 x 10-19 J is called
a.       (a) one volt                  (b) one milli-volt         (c) one electron volt    (d) one mega electron volt
  1. The product of resistance and capacitance is
a.       (a) velocity                  (b) force                      (c) acceleration            (d) time
  1. If 1 ampere current flows through 2m long conductor, the charge flow through this in 1 hour will be
a.       (a) 3600 C                   (b) 7200                       (c) 1 C                         (d) 2 C
  1. The reciprocal of resistance is called
a.       (a) Reactance              (b) conductance          (c) susceptance            (d) conductivity
  1. If a resistor is traversed in the direction of current, the potential change is given as
a.       (a) negative                 (b) positive                  (c) zero                        (d) neutral
  1. The SI unit of magnetic induction is
a.       (a) Weber                    (b) Tesla                      (c) Weber per meter    (d) Gauss
  1. A current carrying conductor is surrounded by
a.       (a) Magnetic field       (b) Electric field          (c) Conservative field (d) Gravitational field
  1. The idea of electric field lines was given by
a.       (a) coulomb                 (b) Faraday                  (c) Milikans                 (d) Ampere
  1. Work done per unit charge is called:
a.       (a) electric flux            (b) electric potential    (c) electric intensity     (d) electric field
  1. The energy density of capacitor is
a.       (a)                  (b)                    (c)               (d)
  1. For air is
a.       (a) 2                             (b) 1.0006                    (c) 2.24                        (d) 78.5
  1. The expression of Electric field intensity due to uniformly distributed infinite sheet of charge is
a.       (a)              (b)                        (c)                          (d)
  1. The SI unit of Electric current is
a.       (a) Volt                        (b) Coulomb                (c) Ampere                  (d) Farad
  1. An ideal voltmeter would have
a.       (a) Very low resistance                                   (b) Double the resistance of circuit
b.      (c) Infinite resistance                                      (d) All
  1. The device which convert heat into electrical energy is
a.       (a) solar cell                 (b) battery                   (c) thermo couple        (d) cell
  1. Internal resistance is a resistance offered by
a.       (a) Source of EMF      (b) the conductor        (c) the circuit               (d) resistor
  1. One ohm =
a.         (a) 1 VA                      (b) 1 V/A                     (c) 1 C/A                     (d) 1 J/A2
  1. If a material object moves with a speed of light, its mass becomes:
a.       (a) equal to its rest mass                                  (b) four times of its rest mass
b.      (c) double of its mass                          (d) infinite
  1. The theory of relativity which deals with non-inertial frame of reference is called:
a.       (a) special theory of relativity             (b) general theory of relativity
b.      (c) quantum theory                                          (d) classical theory
  1. Photocells are used for:
a.       (a) security system                                          (b) counting system
b.      (c) automatic door system                               (d) all of these
  1. Transistors are made from:
a.       (a) plastics                   (b) metals                    (c) insulators    (d) doped semi-conductors
  1. Newton’s laws of motion are valid:
a.       (a) in inertial frame of reference                     (b) in non-inertial
b.      (c) both (a) and (b)                                          (d) all of these
  1. The magnitude of Plank’s constant is:
a.       (a) 8.85x10-19J-S          (b) 6.63x10-34J-S         (c) 6.62x10-19J-S          (d) 0.53x10-10J-S
  1. Compton’s scattering experiment provide a proof that radiation has a:
a.       (a) wave nature                                               (b) particle-wave nature
b.      (c) particle nature                                            (d) x-ray nature
  1. The momentum of moving photon is:
a.       (a) zero                        (b) P=n                    (c) P=                      (d) P=
  1. The maximum energy required by a photon to create an electron positron pair is:
a.       (a) 3Mev                      (b) 4Mev                     (c) 1.02Mev                 (d) 1.5Mev
  1. A logic gate which inverts the input is called:
a.       (a) AND Gate             (b) OR Gate                (c) NOT Gate              (d) none of these
  1. Columb’s law in accordance of Newton’s:
a.       (a) first law                  (b) second law             (c) third law                (d) none of these
  1. The product of charge and potential difference is:
a.       (a) flux                                    (b) current                   (c) energy                    (d) power
  1. Sharks can detect the potential difference of the order of:
a.       (a) milli-volt                (b) micro-volt              (c) nano-volt                (d) pico-volt
  1. The speed of charging and discharging of a capacitor depends upon the product of resistance and as:
a.       (a) current                    (b) charge                    (c) capacitance                        (d) potential difference
  1. The negative of the potential gradient is:
a.       (a) electrostatic force  (b) electromotive force            (c) potential difference           (d) none of these
  1. Two parallel straight wires carrying currents in opposite direction:
a.       (a) repel each other                                          (b) attract each other
b.      (c) have no effect upon each other                 (d) none of these
  1. The S.I unit of flux density is:
a.       (a) Weber                    (b) Tesla                      (c) Weber /Meter         (d) Gauss’s
  1. An electron enters a region where the electric field  is perpendicular to the magnetic field . It will suffer no deflection is:
a.       (a)                 (b)                      (c)                   (d)
  1. Couple necessary to produce unit twist is called:
a.       (a) Deflecting couple  (b) torsional couple     (c) restoring couple     (d) all of these
  1. The path of the electron can be visible by filling glass tube with a gas at:
a.       (a) high pressure          (b) moderate pressure  (c) low pressure                       (d) none of these
  1. The only difference between construction of D.C generator and an A.C generator is that of:
a.       (a) carbon brushes       (b) coil                         (c) commutator                        (d) magnetic field
  1. Which one of the following works like a motor:
a.       (a) galvanometer         (b) ammeter                 (c) voltmeter                (d) all of these
  1. The points where the waveform crosses the time axis corresponds to phase:
a.       (a) 0  and                 (b) 0 and /2              (c) /2 and                         (d) /2 and /4
  1. When XL=XC this condition is called:
a.       (a) null                         (b) balanced                (c) resonance               (d) critical
  1. Domains contains nearly:
a.       (a) 108-109 atoms         (b) 1012-1016 atoms      (c) 1015-1020 atoms      (d) 1025-1030 atoms
  1. Yield stress is another name of:
a.       (a) plasticity                (b) proportional limit   (c) elasticity limit        (d) both (b) and (c)
  1. The minimum number of semiconductor diodes required for full wave rectification are:
a.       (a) 3                             (b) 2                             (c) 4                             (d) 1
  1. In a non-uniform electric field, a polar molecule will experience:
a.       (a) net torque               (b) net force                (c) both (a) and (b)      (d) zero torque
  1. The electric field lines from a charge emerges only in:
a.       (a) one dimension        (b) two dimensions     (c) three dimension     (d) none of these
  1. The electric intensity at infinite distance from the point charge will be:
a.       (a) positive                  (b) zero                                    (c) infinite                   (d) negative
  1. Two parallel straight wires carrying currents in same direction:
a.       (a) repel each other                                          (b) attract each other
b.      (c) have no effect upon each other                 (d) none of these
  1. The S.I unit of flux density is:
a.       (a) NAm-1                    (b) NA-1m-1                  (c) NA-1m                    (d) Nm-1A-2
  1. Charge to mass ratio (e/m) of an electron is:
a.       (a) 0.1x10-31C kg-1       (b) 9.1x10-19C kg-1       (c) 1.75x1011C kg-1      (d) 1.67x10-27C kg-1
  1. In a moving coil galvanometer, the deflection couple depends upon:
a.       (a) area of the coil                                           (b) number of turns of coil
b.      (c) value of magnetic field                              (d) all of these
  1. The brightness of the spot on CRO screen is controlled by:
a.       (a) cathode                  (b) anode                     (c) grid                                    (d) plates
  1. The magnetic force is:
a.       (a) restoring force        (b) Lorentz force         (c) deflecting force     (d) all of these
  1. If the coil is wound on a iron core, the flux through it will:
a.       (a) increases                 (b) decreases               (c) remain constant      (d) be zero
  1. If the velocity of a conductor moving through a magnetic field B is zero, then its motional emf will be:
a.       (a)                     (b)                        (c)                      (d) zero
  1. If the plane of the generator coil is parallel to field then emf induced in the coil is:
a.       (a) maximum               (b) minimum                (c) zero                                    (d) intermediate value
  1. Current in a dry cell is an example of:
a.       (a) A.C                                    (b) D.C                                    (c) both (a) and (b)      (d) none of these
  1. The basic circuit element in a D.C circuit which controls the current or voltage is a:
a.       (a) capacitor                (b) inductor                 (c) resistor                   (d) none of these
  1. The curie temperature for  iron is:
a.       (a) 875oC                     (b) 750oC                     (c) 1000oC                   (d) 950oC
  1. The coercivity of the steel is:
a.       (a) more than the iron  (b) less than the iron    (c) equal to the iron     (d) none of these
  1. If a reverse current of a reverse biased junction is increased to a maximum value then:
a.       (a) diode becomes more efficient                   (b) voltage drop to zero
b.      (c) diode junction may break down                (d) none of these
  1. The electric field lines emerges only in:
a.       (a) one dimension        (b) two dimensions     (c) three dimensions    (d) none of these
  1. During photocopy the dark areas of documents retain their:
a.       (a) positive charge       (b) negative charge      (c) both (a) and (b)      (d) none of these
  1. The electric intensity between two oppositely charged plates:
a.       (a)                         (b)                (c)                (d)
  1. One tesla is equal to:
a.       (a) wbm2                      (b) wbm-2                     (c) wbm-1                     (d) wbm
  1. The current passing through the coil of galvanometer:
a.       (a) directly proportional to angle of deflection           (b) inversely proportional to angle of deflection
b.      (c) constant                                                     (d) all of these
  1. To convert a galvanometer into a ammeter the shunt resistance is given by:
a.       (a)            (b)            (c)            (d)
  1. The mutual inductance has practical role in the performance of:
a.       (a) radio choke                        (b) a.c generator          (c) d.c generator          (d) transformer
  1. The emf produced by an alternating generator:
a.      (a)          (b)         (c)          (d)
  1. The back emf of a motor can be expressed as:
a.       (a)               (b)              (c)               (d)
  1. If Vo is the peak value of A.C voltage, its rms value is:
a.       (a)               (b)            (c)                (d)
  1. The opposition offered by the inductor to flow of A.C is called:
a.       (a) capacitance                        (b) resistance               (c) inductive reactance            (d) impedance
  1. In the equation  is called:
a.       (a) phase angle                        (b) limiting angle         (c) critical angle           (d) power factor
  1. The solid which have regular arrangement of atom is:
a.       (a) glassy solid                        (b) polymeric solid      (c) crystalline solid      (d) all of these
  1. A unit cell is the smallest basic structure which is:
a.       (a) two dimensional    (b) one dimensional     (c) three dimensional   (d) none of these
  1. In general most of the electrical circuits make use of:
a.       (a) n-n-junction                       (b) p-p-junction                       (c) n-p-n-transistor      (d) p-n-p-transistor
  1. The resistance between (+) and (-) inputs of an op-amp is of the order:
a.       (a) several mega Ohms            (b) a few Ohms                       (c) both (a) and (b)      (d) none of these
  1. The mathematic symbol for OR operation:
a.       (a) X=A.B                    (b)                 (c) X=A+B                  (d)
  1. If unit charge experience a force of 100 N at a point in a electric field then electric field intensity will be.
216.                      a) 100 N/C                  b) 10 N/C                    c) 16 ×10-19 N/C          d) 10×10-19N/C
  1. A particle  of mass m and charge q is released from rest in a uniform electric field E.The K.E attained by the particle  after moving a distance ‘d’ is
218.                      a) Ed/q                                    b) qEd                         c) qE2d                                    d) qE/d2
  1. Uniform electric field can be mapped with electric field lines which are.
220.                      a) Parallel                                                        b) Parallel and equally spaced
221.                      c) equally spaced                                             d) None of these
  1. Electric intensts  b/w same charged parallel platens is
223.                      a) /o                        b) /2o                     c) 2/o                      d) Zero
  1. Neutral  zone in an electric field of two similar charges is a region where.
a)      Both Positive and negative charges are present.
b)      Equal quantity of both positive and negative charges are present.
225.                      c) an electric dipole exist .                              d) No electric field lines passes.
  1. Three charges +Q each are placed at the corners A, B and C of an equilateral triangle. At the circum centre O, the electric field strength is
227.                      a) Zero                         b)                      c)                          b)
  1. Four charges each are placed at the corners of a squire of side a. The electric field at the centre of square is
229.                      a) Zero                                     b)                      c)                      d)
  1. An electric field can deflect
231.                      a) x-rays                      b) Neutrons                 c) Ionized Helium       d) -rays atom
  1. If electric field is uniform then the electric lines of forces are
233.                      a) Divergent                b) Convergent                         c) Circular                   d) Parallel
  1. The relative permittivity of distilled water is .
235.                      a) 78.5 C2 N-1 m-2        b) 1 C2 N-1m-2              c) 22- 25 C2N-1m-2       d) None
  1. The value of 2 for various dielectric is always.
237.                      a) Less than unity        b) equal to unity          c) Larger than unity    d) none of these
  1. Which one is a photo conductor.
239.                      a) Selenium                                                     b) Sodium coated oxides
240.                      c) Potassium coated oxides                             d) All  of these
  1. Negative and positive charges in a hollow sphere are equal in number then flux from the surface will  be.
242.                      a) Zero                                                             b) Positive
243.                      c) Negative                                                      d) flux will be both positive and negative
  1. The Gaussian surface must has shape which is.
245.                      a) Spherical                 b) cylindrical               c) Box type                 d) any arbitrary closed shape
  1. The black dry powder sprayed over the drum of photo copier is.
247.                      a) Neutral                    b) Positively charged              c) Negatively Charged            d) None of these
  1. The apparatus used by coulomb is .
249.                      a) Cavendish               b) Torsion balance       c)  Physical balance     d) Gold leaf dichroscope
  1. Electric field intensity between two Similar charged parallel plates
251.                      a) Zero                         b) ω/o                         c) ω/o                               d) Non
  1. The product of charge and potential difference is:
a.       (a) flux                                    (b) current                   (c) energy                                (d) power
  1. The reciprocal of resistance is called:
a.       (a) resistance               (b) conductance                      (c) susceptance                                    (d) reactance
  1. A silver band resistor shows a tolerance of:
a.       (a)                       (b)                     (c)                                 (d)
  1. Magnetic induction is also called:
a.       (a) flux                                    (b) magnetic intensity (c) flux density                                    (d) all of these
  1. A device used for the detection and measurement of small amount of current is called:
a.       (a) Avometer               (b) Voltmeter              (c) Galvanometer                    (d) Ammeter
  1. A high speed graph plotting device is:
a.       (a) Monitor                  (b) Television              (c) Cathode ray oscilloscope   (d) All of these
  1. Transformer is used to change:
a.       (a) Electrical energy    (b) magnetic field        (c) voltage of A.C                   (d) Electrical power
  1. One henry is equal to:
a.       (a)                     (b)                   (c)                                  (d)
  1. Self induced emf is sometimes called:
a.       (a) motional emf          (b) constant emf          (c) back emf                            (d) variable emf
  1. The back emf of a motor can be expressed as:
a.       (a)               (b)              (c)                           (d)
  1. The electric intensity at infinite distance from the point charge is
a.       (a) zero                                    (b) infinite                               (c) 1 volt m-1                (d) positive
  1. The unit of electrical energy is
a.       (a) watt                                    (b) kilowatt                             (c) kilowatt-hour         (d) volt
  1. The earth’s potential is considered as:
a.       (a) negative                 (b) positive                              (c) zero                                    (d) infinite
  1. If the current passing through a wire in a magnetic field is halved the magnetic force would become
a.       (a) half                         (b) twice                                  (c) four times               (d) six times
  1. The relation for a straight current carrying a wire is called
a.       (a) Faraday’s Law       (b) Gauss’s Law                      (c) Ampere’s Law       (d) Lenz’s Law
  1. In particle velocity selector method, the selected speed is given by
a.       (a)                    (b)                                (c)                    (d)
  1. In order to increase the range of an ammeter, the shunt resistance is:
a.       (a) decreased               (b) increased                            (c) kept constant         (d) zero
  1. The pole pieces of the magnet in galvanometer are made concave to make the field
a.       (a) strong                     (b) weak                                  (c) radial                      (d) radial & strong
  1. The coil placed in the galvanometer or voltmeter circuit in the experiment of mutual induction is known as:
a.       (a) primary coil                        (b) secondary coil                    (c) resistance               (d) none of these
  1. The number of coils wound around an iron cylinder and related in magnetic field is called:
a.       (a) turbine                    (b) commutator                                   (c) an armature                        (d) transformer
  1. The electric intensity at infinite distance from the Charge is:
a.       (a) infinite                   (b) zero                        (c) positive                  (d) negative
  1. If a charge body is moved against the electric filed it will gain:
a.       (a) potential energy                                         (b) K.E
b.      (c) mechanical energy                         (d) electric potential energy
  1. Capacitance of a capacitor is increased by decreasing:
a.       (a) area of plates                                              (b) medium between plates
b.      (c) distance between plates                 (d) none of these
  1. Which of the following substance has positive temperature co-efficient of resistance:
a.       (a) copper                                (b) aluminum   (c) silver                      (d) all of these
  1. When a battery is being charged, its terminal potential difference is:
a.       (a) less than emf                                              (b) greater than emf
b.      (c) equal to emf                                               (d) none of these
  1. Radial magnetic field is used in a galvanometer so that the galvanometer scale is:
a.       (a) exponential            (b) circular                   (c) linear                      (d) none of these
  1. If the north pole of a magnet moves away from a metallic ring then the current flows:
a.       (a) clockwise               (b) anticlockwise         (c) both ‘a’ and ‘b’      (d) none of these
  1. The magnetic field produced around a current carrying straight conductor is given by:
a.       (a)                 (b)                (c)                         (d)

  1. Magnetic flux linked with a coil can be changed by using a:
a.       (a) Permanent magnet                         (b) electromagnet
b.      (c) both ‘a’ & ‘b’                                 (d) none of these
  1. If the motor is overloaded, then the magnitude of “Back emf”:
a.       (a) Increase                  (b) decreases               (c) constant                 (d) becomes zero
  1. A choke is used as a resistance in:
a.       (a) A.C circuit (b) potential divider    (c) D.C circuit (d) wheat stone bridge
  1. Which one of the following is a ductile substance:
a.       (a) copper                    (b) lead                        (c) wrought iron          (d) all of these
  1. The basic region of transistor is:
a.       (a) base                        (b) collector                 (c) emitter                    (d) all of these
  1. Find the gain of an inverting amplifier of external resistances R1=10K and R2=100K:
a.       (a) -5                            (b) -10                         (c) 10                           (d) 50
  1. Radiation having wavelength shorter than violet is called:
a.       (a) x-rays                     (b) infrared                  (c) ultra violet  (d) r-rays
  1. Thyroid cancer is cured by:
a.       (a) carbon-14               (b) sodium-24  (c) iodine-131  (d) cesium-137
  1. The principle on the basis of dual nature of light was first discovered by:
a.       (a) Compton                (b) J.J Thomson           (c) De-Broglie (d) Heisenberg
  1. The value of relative permittivity for all the dielectrics other than air or vacuum is always:
a.       (a) less than unity        (b) greater than unity  (c) equal to unity         (d) zero
  1. Three capacitors of capacitance 1F each are connected in series. Their equivalent capacitance Ceq is:
a.       (a) 3F                       (b) F                     (c) 0.03F                  (d) 1F
  1. The unit of reciprocal of resistivity is:
a.       (a) ohm – m                 (b) siemen – m-1           (c) mho – m-1               (d) both b & c
  1. The practical unit of electrical power is:
a.       (a) watt                        (b) Horse power          (c) Kilo watt hour       (d) kilowatt
  1. Radial magnetic field is used in a galvanometer so that the galvanometer scale is:
a.       (a) exponential                        (b) circular                   (c) linear                      (d) none of these
  1. Magnetic flux density at a point due to the current carrying conductor determined by:
a.       (a) Faraday’s law        (b) Amperes law          (c) Flemming’s law     (d) Gauss’s law
  1. When the back emf is zero, it draws:
a.       (a) zero current                        (b) minimum current   (c) maximum current   (d) steady current
  1. A coil has an inductance of 0.02 Henry. When a current in the coil is changing at the rate of 150 A/s then the induced emf will be:
a.       (a) 3V                          (b) 0.3V                       (c) 1.5 V                      (d) 0.2 V
  1. When we say that Lenz law refers to induced currents, it means that we can apply it directly to:
a.       (a) open circuits                                               (b) closed conducting loop
b.      (c) every circuits                                              (d) None of these
  1. If frequency f is in Hz and inductance L is in milli henry, then Xl is in:
a.       (a) milli ohm                (b) kilo ohm                 (c) ohm                        (d) none of these
  1. The A.C circuit in which current and voltage are in phase, the power factor is:
a.       (a) 1                             (b) zero                        (c) infinity                   (d) 0.5
  1. Electromagnetic waves emitted from antenna are:
a.       (a) transverse               (b) longitudinal                       (d) stationary               (d) all of these
  1. When a battery is being charged, its terminal potential difference is:
a.       (a) less than emf                                              (b) greater than emf
b.      (c) equal to emf                                               (d) none of these
  1. Radial magnetic field is used in a galvanometer so that the galvanometer scale is:
a.       (a) exponential            (b) circular                   (c) linear                      (d) none of these
  1. If the north pole of a magnet moves away from a metallic ring then the current flows:
a.       (a) clockwise               (b) anticlockwise         (c) both ‘a’ and ‘b’      (d) none of these
  1. The magnetic field produced around a current carrying straight conductor is given by:
a.       (a)                 (b)                (c)                         (d)

  1. Magnetic flux linked with a coil can be changed by using a:
a.       (a) Permanent magnet                         (b) electromagnet
b.      (c) both ‘a’ & ‘b’                                 (d) none of these
  1. If the motor is overloaded, then the magnitude of “Back emf”:
a.       (a) Increase                  (b) decreases               (c) constant                 (d) becomes zero


You may also like:

This is the post on the topic of the 2nd Year Chemistry Important MCQs solved. The post is tagged and categorized under in , Tags. For more content related to this post you can click on labels link.
You can give your opinion or any question you have to ask below in the comment section area. Already 0 people have commented on this post. Be the next one on the list. We will try to respond to your comment as soon as possible. Please do not spam in the comment section otherwise your comment will be deleted and IP banned.

,
Next
Prev Post
Previous
Next Post
Maher Afrasiab

About Maher Afrasiab

Hello, I am Maher Afrasiab a founder of Ratta.pk and some other websites. I have created ratta.pk to promote the eductaion in Pakistan. And to help the students in their studies. Find me on Facebook: @Maher Afrasiab

No comments:
Write comments

Trending!

© Copyrights 2021 Ratta.pk. Powered by Blogger.
–>