2nd year Physics Important MCQs Solved

If you are in search of the multiple chioce questions of 12th class physics then you are at the right spot because here we have published the 2nd year Physics Important MCQs Solved.

i). According to Einstein equation 1kg is:

(a) 9x10¹⁶J (b) 3x10⁸J (c) 1x10¹⁶J (d) 1J

ii). If minimum division is 1mm on a scale then what would be the correct one:

(a) 0.2145m (b) 0.21m (c) 0.214m (d) none of these

iii). A precise measurement is one which has less:

(a) precision (b) absolute uncertainty

iv). If a body is moving with uniform angular velocity the torque acting on the body will be:

(a) negative (b) positive (c) zero (d) none of these

v). For a body to be in complete equilibrium:

(a) Fx=0 (b) Fy=0 (c) =0 (d) all of these

vi). If and then is:

(a) 9 (b) -9 (c) -10 (d) 10

vii). The slope of velocity time graph gives:

(a) acceleration (b) displacement (c) distance (d) none of these

viii). If a body is moving with constant velocity of 50m/s towards East then its acceleration is:

(a) 20m/s² (b) 8m/s² (c) zero (d) none of these

ix). In a projectile motion, the horizontal range R depends upon:

(a) angle of projection (b) initial velocity

x). The field in which work done is independent of the path followed is:

(a) conservative filed (b) gravitational field

xi). The absolute P.E on the surface of the earth w.r.t centre of earth is:

(a) zero (b) -GMm/R (c) maximum (d) mgh

xii). Solar energy while passing through the atmosphere, the total energy is:

(a) 1.4KWm^-2 (b) 1KWm^-2 (c) 1.5Wm^-2 (d) 1Km^-2

xiii). Which theory of gravitational force is better:

(a) Einstein (b) Newton (c) Compton (d) Michelson

xiv). If rope of an elevator moving downward with acceleration ‘a’ breaks, then apparent weight is:

(a) m(a-g) (b) m(a+g) (c) m(g-a) (d) zero

xv). The ratio of the moment of inertia of disk and hoop is:

(a) ½ (b) 2 (c) mr² (d) ½ mr²

xvi). Blood is an incompressible fluid having a density nearly equal to that of::

(a) oil (b) milk (c) water (d) all of these

xvii). Flow rate is equal to:

(a) volume (b) area (c) constant (d) all of these

i). The perpendicular distance from the line of action of force to the pivot is called:

(a) Displacement (b) Force (c) Momentum (d) Moment arm

ii). is equal to:

(a) (b) 1 (c) 2 (d) 0

iii). In a projectile motion, the horizontal range R depends upon:

(a) Initial velocity (b) Angle of projection (c) Both ‘a’ and ‘b’ (d) None of these

iv). With the help of velocity time graph, we can find:

(a) Distance (b) Acceleration (c) Momentum (d) Both a&b

v). The loss of P.E is equal to gain in K.E, is true only if there is no:

(a) Weight (b) Gravity (c) Friction (d) None of these

vi). Geysers usually occurs in:

(a) Cold regions (b) Hot regions (c) Volcanic regions (d) None of these

vii). Height of closest orbit of the satellite above the earth is:

(a) 300Km (b) 400Km (c) 500Km (d) 250Km

viii). Blood is an incompressible fluid having a density nearly equal to that of:

(a) Milk (b) Water (c) Oil (d) None of these

ix). If mass attached to spring increases, then its time period:

(a) Decrease (b) Increases (c) No change (d) All of these

x). When a particle is moving along circular path its projection along the diameter executes:

(a) S.H.M (b) Linear motion (c) Angular motion (d) None of these

xi). The wave form of SHM is:

(a) Cosine wave (b) Square wave (c) Sine wave (d) None of these

xii). The distance between two consecutive node is:

(a) (b) (c) (d)

xiii). The speed of sound at 30^oC is approximately equal to:

(a) 333 rns^-1 (b) 280 rns^-1 (c) 332 (d) 350 rns^-1

xiv). If 30 waves per second pass through a medium at 30 m/s, wavelength of these waves is:

(a) 30m (b) 15m (c) 1m (d) 280m

xv). When an object moves in a circle, the angle between angular velocity and linear velocity V is:

(a) 90^o (b) 0^o (c) 45^o (d) 60^o

xvi). The relation between linear acceleration and angular acceleration is:

(a) (b) (c) (d)

xvii). The dimensions of angular momentum are:

(a) [M²LT^-1] (b) [M²L²T^-1] (c) [ML²T²] (d) [ML²T^-2]

xviii). Speed of hoop at the bottom can be given by:

(a) (b) (c) (d) None of these

xix). Height of geo-stationary satellite above the equator is:

(a) 40,000 km (b) 24,000 km (c) 30,000 km (d) 36,000 km

xx). The drag force increases as the speed of particle:

(a) increases (b) decreases (c) remains constant (d) None of these

xxi). The SI unit of coefficient of viscosity is:

(a) kg m^-1s^-1 (b) Nm²s² (c) kg m²s^-2 (d) kg ms^-2

xxii). The terminal velocity of water droplet of radius 1 x 10^-4 m and density 1000 kg/m³ falling through air of viscosity 19x10^-6 kg/ms is:

(a) 1.5 m/s (b) 2.3 m/s (c) 3.4 m/s (d) 1.1 m/s

xxiii). Venturi meter is a device used to measure:

(a) viscosity of fluid (b) density of fluid (c) pressure of fluid (d) speed of fluid

xxiv). The velocity of liquid below which its flow is laminar is called:

(a) critical velocity (b) escape velocity (c) relative velocity (d) None of these

xxv). A body attached to a spring is pulled to a distance of 20cm. if the spring constant k is 48 N/m then the force applied:

(a) 5.3 N (b) 9.6 N (c) 96 N (d) 192 N

xxvi). The instantaneous speed of the projection on the diameter for a particle moving in a circle is:

(a) (b) (c) (d) None of these

xxvii). When potential energy of the mass is maximum, the kinetic energy of the spring is:

(a) zero (b) maximum (c) minimum (d) None of these

xxviii). The wavelength of the waves produced in microwave oven is:

(a) 8 cm (b) 10 cm (c) 14 cm (d) 12 cm

xviii). The equation V_o=X_ow is for:

(a) spring mass system (b) Simple pendulum

xix). By increasing length of simple pendulum, its time period:

(a) decreases (b) increases (c) remain constant (d) none of these

xx). When damping is small, the amplitude of vibration at resonance will be:

(a) small (b) unchanged (c) large (d) none of these

xxi). Speed of light in vacuum depends upon:

(a) time period (b) frequency (c) wavelength (d) none of these

xxii). The wavelength of the fundamental mode of vibration of a closed end pipe is:

(a) 2l (b) l (c) 4l (d) l/2

xxiii). Increase in velocity of sound in air for 1^oC rise in temperature is:

(a) 1.61m/s (b) 6.10m/s (c) 0.61m/s (d) 0.06m/s

xxiv). Newton’s rings are dark at the center due to:

(a) destructive interference (b) constructive interference

xxv). The direction in which light energy is carried is called a:

(a) locus (b) wavefront (c) ray (d) beam

xxvi). Which one of the following is optically active substance:

(a) quartz crystal (b) sodium oxide (c) tartaric acid (d) all of these

xxvii). For normal adjustment, length of astronomical telescope is:

(a) (b) (c) (d)

xxviii). For angles of incidence greater than the critical angle, all the light is:

(a) reflected (b) refracted (c) diffracted (d) both ‘a’ and ‘b’

xxix). Using a graded index fiber the time difference is reduced to:

(a) 1ns per km (b) 2ns per km (c) 1us per km (d) 0.01 ns per km

xxx). The magnifying power of simple microscope is given by:

(a) (b) (c) (d) all of these

xxxi). A heat engine is made cyclic to provide a continuous supply of:

(a) heat (b) work (c) energy (d) none of these

xxxii). The volume is directly proportional to absolute temperature of gas provided pressure is kept constant:

(a) Charles’ law (b) Boyle’s law

xxxiii). The efficiency of a carnot engine is:

(a) infinite (b) zero (c) less than one (d) greater than one

xxxiv). Second fixed point of the thermodynamic temperature scale is chosen as:

(a) absolute zero (b) 0^oC (c) 0^oF (d) 37^oC

xxix). The minimum number of unequal forces whose vector sum can be zero is:

(a) 1 (b) 2 (c) 3 (d) 4

xxx). The cross product of vector with it self ( x ) is equal to:

(a) A (b) A² (c) 2A (d) Zero

xxxi). The dot product = = is equal to:

(a) Zero (b) 1 (c) -1 (d)

xxxii). Which of the following is vector quantity:

(a) length (b) volume (c) mass (d) velocity

xxxiii). A body will be in rotational equilibrium if:

(a) (b) (c) (d)

xxxiv). The dimensions of weight are give by:

(a) [LT^-1] (b) [LT^-2] (c) [MLT^-2] (d) [ML²T]

xxxv). The property of body due to which it opposes its state of rest or uniform motion is called:

(a) momentum (b) weight (c) torque (d) inertia

xxxvi). The S.I unit of impulse is:

(a) Kgms^-1 (b) NS (c) Newton (d) Both (a) and (b)

xxxvii). A football kicked in the air is an example of:

(a) Rotational motion (b) circular motion (c) linear motion (d) projectile motion

xxxviii). The mass of the fuel consumed by a typical rocket to overcome earth’s gravity is:

(a) 1000 kgs^-1 (b) 100 kgs^-1 (c) 10000 kgs^-1 (d) 10 kgs^-1

xxxix). Work is a:

(a) vector quantity (b) Scalar quantity (c) both (a) and (b) (d) None of these

xl). Power is also defined as the dot product of:

(a) Force and mass (b) force and displacement

xli). If the direction of motion of force is perpendicular to the direction of the motion of the body, then work done will be:

(a) minimum (b) maximum (c) zero (d) None of these

xlii). Energy stored in the spring of which is called:

(a) potential energy (b) kinetic energy (c) both (a) and (b) (d) None of these

xliii). A vector has ‘zero’ magnitude is called:

(a) Null vector (b) unit vector (c) position vector (d) a negative vector

xliv). The sum of two or more vectors is equal to a single vector is known as:

(a) resultant vector (b) component of vector (c) position vector (d) product of vector

xlv). If a vector makes an angle with x-axis its x-component given by:

(a) A Sin (b) A Cos (c) A tan (d) A Sin x

xlvi). The scalar product of a vector with itself is equal to:

(a) F (b) F² (c) 2F (d) F/2

xlvii). The magnitude of is:

(a) 1 (b) 0 (c) -1 (d)

xlviii). Which of the following are vector quantities:

(a) area (b) momentum (c) energy (d) both (a) & (b)

xlix). If r = 5m and F=4N are along same direction then torque is:

(a) 5Nm (b) 20Nm (c) 10 Nm (d) zero

l). The space around the earth in which its gravitational force acts on a body is called:

(a) electrostatic field (b) gravitational field (c) Frictional field (d) None of these

li). Examples of non-conservative field are:

(a) frictional force (b) Tension in a string (c) Normal force (d) All of these

lii). The value of escape velocity is:

(a) 11kms^-1 (b) 11x10³ms^-1 (c) both (a) and (b) (d) None of these

liii). The slope of velocity time graph gives:

(a) Distance (b) Area (c) Acceleration (d) Speed

liv). The power can be expressed by a formula:

(a) P = wt (b) P = w/t (c) P = f/w (d) P = w/t

lv). If =180^o the work done will be:

(a) zero (b) maximum (c) -1 (d) 1

lvi). K.E is a:

(a) Scalar quantity (b) vector quantity (c) both (a) and (b) (d) None of these

i). The path followed by projectile is known as:

(a) range (b) maximum range

ii). A force which always opposes the motion of a body is called:

(a) impulse (b) force of friction (c) elastic force (d) gravitational force

iii). The S.I unit of force is:

(a) joule (b) Newton (c) erg (d) dyne

iv). The energy stored in a dam:

(a) heat energy (b) gravitational P.E

v). Kinetic energy is a:

(a) scalar quantity (b) vector quantity

vi). When the fuel in the rocket is ejected, the mass of rocket decreases and its acceleration:

(a) increases (b) decreases (c) remain constant (d) none of these

vii). The ballistic missiles are useful only for:

(a) short ranges (b) long ranges (c) greater precision (d) none of these

viii). The range of projectile depends upon:

(a) velocity of projection (b) angle of projection

ix). The value of solar constant is:

(a) 1.4kw (b) 1.9kwm^-1 (c) 1.4kwm^-2 (d) 1.02kwm^-2

x). Salter’s duck consists of:

(a) Duck float (b) balance float (c) both (a) and (b) (d) none of these

lvii). When a body is whirled in a vertical circle at the end of the string tension in the string is maximum:

(a) at the top (b) at the bottom (c) at the horizontal (d) none of these

lviii). In case of planets the necessary acceleration is provided by:

(a) gravitational force (b) frictional force (c) coulomb’s force (d) centripetal force

lix). For the angular momentum of a system to remain constant the external torque should be:

(a) small (b) large (c) zero (d) both (a) and (c)

lx). The weight of a man in an elevator moving down with an acceleration of 9.8 ms^-2 will become:

(a) half (b) zero (c) unchanged (d) double

lxi). Speed of a hoop at the bottom of inclined plane can be given by:

(a) (b) (c) (d) None of these

lxii). The relation between torque and moment of inertia is:

(a) (b) (c) (d)

lxiii). Stoke’s law holds for bodies when they have:

(a) spherical shape (b) rectangular shape (c) curved shape (d) all of these

lxiv). Venturi-meter is a device used to measure:

(a) density of fluid (b) Speed of fluid (c) Pressure of fluid (d) all of these

lxv). Human blood pressured is measured in:

(a) Nm^-2 (b) mm (c) torr (d) cm

lxvi). When the external pressure applied becomes larger than the systolic pressure, then the vessels:

(a) expand (b) contract (c) collapse (d) remain normal

lxvii). The wave form of S.H.M is:

(a) Pulsed wave (b) Sine wave (c) square wave (d) Cosine wave

lxviii). The maximum velocity V_o of the mass attached to the end of an elastic spring:

(a) Vo = (b) Vo = (c) Vo = (d) Vo =

lxix). If mass attached to a spring increases, then its time period:

(a) remains constant (b) decreases (c) increase (d) None of these

lxx). The relation between frequency and time period T is :

(a) f = 1/T (b) f = (c) f = (d)

xxxv). Image formed by a plane mirror is:

(a) virtual, erect and equal in size to the object

(b) virtual, erect and smaller in size to the object

xxxvi). The resolving power of an astronomical telescope depends upon:

(a) the focal length of eyepiece (b) the focal length of the objective

xxxvii). The supplementary units are named as:

(a) joule and Newton (b) meter and kilogram

xxxviii). Prefix deca is equal to:

(a) 10m² (b) 10m¹ (c) 10m³ (d) 10m^-1

xxxix). When a body moves up on a rough inclined plane, it is acted upon by:

(a) two forces (b) one force (c) three forces (d) four forces

xl). The slope of velocity time graph gives:

(a) distance (b) area (c) acceleration (d) speed

xli). Angular momentum of a body under a centripetal force is:

(a) zero (b) maximum (c) minimum (d) constant

xlii). A man in an elevator descending with acceleration will conclude his weight has:

(a) increased (b) decrease (c) constant (d) reduces to zero

xliii). If length of simple pendulum become four times, then its time period will become:

(a) four times (b) six times (c) eight times (d) two times

xliv). Bending of light around the edges of an obstacle is called:

(a) refraction (b) polarization (c) interference (d) diffraction

xlv). At constant temperature, the graph between V and I/P is:

(a) hyperbola (b) parabola (c) straight line (d) ellipse

xlvi). No entropy change is the measure of:

(a) isobaric process (b) isochoric process

xlvii). The ability or capacity to do work is called:

(a) force (b) power (c) kinetic energy (d) energy

xlviii). A moving car possesses:

(a) K.E (b) energy (c) P.E (d) both K.E and P.E

xlix). The fluid which is incompressible and non viscous is called:

(a) viscous fluid (b) non ideal fluid (c) ideal fluid (d) perfect fluid

l). Human blood pressure is measured in:

(a) N-m² (b) mm of Hg (c) pascal (d) cm

li). When source of sound moves away from a stationary listener there is:

(a) an apparent increase in wavelength (b) an apparent decrease in frequency

lxxi). A man in an elevator ascending with an acceleration will conclude that his weight has:

(a) Increased (b) Decreased (c) Remains constant (d) Reduced to zero

lxxii). Centripetal force performs:

(a) maximum work (b) minimum work (c) negative work (d) no work

lxxiii). A fog droplet falls vertically through air with an acceleration:

(a) less than g (b) greater than g (c) equal to g (d) equal to zero

lxxiv). Unit of gh in Bernoulli’s equation is that of:

(a) force (b) work (c) pressure (d) volume

lxxv). At which of the following places motion of a simple pendulum is faster:

(a) Muree (b) K-2 (c) Multan (d) Karachi

lxxvi). The period of a simple pendulum, whose length is 0.98m, is:

(a) 2 (b) 2 (c)2 (d)

lxxvii). The amplitude at resonance of a vibration body situated in the air becomes:

(a) Infinite (b) Zero (c) Maximum (d) Minimum

lxxviii). On loading the prong of a tuning fork with wax, its frequency:

(a) Increases (b) Decreases (c) remains unchanged (d) My increase or decrease

lxxix). Quality of sound depends upon its:

(a) Amplitude (b) Frequency (c) Harmonics (d) Intensity of sound

lxxx). The speed of sound is independent of:

(a) temperature (b) pressure (c) medium (c) None of these

lxxxi). The speed of sound at 30^oC is approximately equal to:

(a) 332 ms^-1 (b) 335 ms^-1 (c) 340 ms^-1 (d) 350 ms^-1

lxxxii). The blue colour of the sky is due to:

(a) Diffraction (b) Reflection (c) Polarization (d) Scattering

lxxxiii). The direction in which light energy is carried is called a:

(a) Locus (b) Wave front (c) Ray (d) Beam

lxxxiv). The light emitted from LED has a wave length:

(a) 1.3 (b) 1.2 (c) 1.4 (d) 1.5

lxxxv). Substance which can not flow easily have:

(a) Large viscosity (b) zero viscosity (c) small viscosity (d) None of these

lxxxvi). A fog droplet falls vertically through air with acceleration:

(a) equal to ‘g’ (b) greater then g (c) less than g (d) equal to zero

lxxxvii). If area of cross-section is decreased then fluid pressure:

(a) Increase (b) Decrease (c) remains same (d) May increase or decrease

lxxxviii). Human blood pressure measured in:

(a) Nm^-1 (b) torr (c) Nm^-2 (d) Nm^-3

lxxxix). The angular acceleration is produced due to:

(a) displacement (b) torque (c) force (d) centrifugal force

xc). /6 radian is equal to:

(a) 30^o (b) 60^o (c) 90^o (d) 45^o

xci). Work done due to a centripetal force is:

(a) zero (b) maximum (c) minimum (d) constant

xcii). When the lift is at rest, newtons second law tells us that acceleration is:

(a) zero (b)minimum (c) maximum (d) equal to ‘g’

xciii). 1 GHz is equal to:

(a) 10⁹Hz (b) 10³Hz (c) 10¹²Hz (d) 10⁶Hz

xciv). The area under the velocity time graph is equal to:

(a) displacement (b) velocity (c) acceleration (d) None of these

xcv). Source of geothermal energy is:

(a) radioactive decay (b) residual heat of earth

xcvi). The energy stored in a dam is:

(a) elastic P.E (b) gravitational P.E (c) K.E (c) electric energy

xcvii). Kilo-watt hour is unit of:

(a) power (b) energy (c) torque (d) momentum

xcviii). Slope of work- time graph is equal to:

(a) force (b) velocity (c) power (d) energy

xcix). One light year is equal to:

(a) 9.46x10¹⁵cm (b) 9.46x10¹⁵m (c) 9.46x10¹⁵km (d) 7.88x10¹⁴m

c). If the radius of a small sphere is measured as 2.25cm by a vernier calipers with least count 0.01cm, then %age uncertainty in volume of the sphere is:

(a) 2% (b) 1.2% (c) 1.25% (d) 0.6%

ci). If the resultant of two forces each of magnitude F is 2F. then the angle between them will be:

(a) 60^o (b) 0^o (c) 30^o (d) 90^o

cii). If two non-zero vectors and are parallel to each other, then:

(a) . =0 (b) , =ab (c) | x |=ab (d) x =0

ciii). If x = points along +z-axis then the vector A and B must lie in:

(a) x,y plane (b) y,z plane (c) –z,x plane (d) –x,y plane

civ). The dimensions of work are:

(a) [MLT^-1] (b) [MLT^-2] (c) [ML²T^-2] (d) [ML²T^-1]

cv). The number of significant figures in 5.400 are:

(a) three (b) two (c) five (d) none of these

cvi). The scientist who made first attempt to measure speed of light was:

(a) Michelson (b) Galileo (c) Morley (d) Maxwell

cvii). The detector in photo phone is made of:

(a) Germanium (b) Silicon (c) Aluminum (d) Selenium

cviii). The optical fiber is covered for protection with:

(a) rubber jacket (b) plastic jacket (c) steel jacket (d) copper jacket

cix). If a convex lens has focal length ‘f’ is equal to 5cm placed at a distance of 25cm than the magnification will be:

(a) 2.5 (b) 6 (c) 7.5 (d) 10

cx). Temperature of human body on Kelvin scale is:

(a) 273k (b) 373k (c) 310k (d) 326k

cxi). The sum of all forms of molecular energies of a substance is termed as:

(a) temperature (b) internal energy (c) heat (d) none of these

cxii). If the pressure is increased, the melting point of ice:

(a) increases (b) decreases (c) remains same (d) none of these

cxiii). The viscosity of glycerine at 30^o is:

(a) 1.6 (b) 6.29 (c) 0.019 (d) none of these

cxiv). The direction of the streamlines is the same as the direction of:

(a) velocity (b) acceleration (c) displacement (d) none of these

cxv). If we take initial phase as , the displacement is:

(a) x=x_ocoswt (b) x=x_osinwt (c) x=x_otanwt (d) x=x_ocotwt

cxvi). The waves which propagate instead of material particles are:

(a) mechanical wave (b) progressive waves

(c) travelling waves (d) electromagnetic waves

cxvii). The profile of the periodic waves generated by a source executing SHM is represented by a:

(a) tangent curve (b) cosine curve (c) sine curve (d) all of these

cxviii). The speed of the efflux of the liquid is the same as the speed of the ball that fall, through height:

(a) h₁-h₂ (b) h₁+h₂ (c) h₁/h₂ (d) none of these

cxix). A transverse wave is incident on rarer medium, the phase change is:

(a) 180^o (b) 90^o (c) 270^o (d) no change

cxx). If the pipe is closed at one end the harmonics generated are:

(a) even (b) odd (c) rational (d) real

cxxi). If the star is moving towards the earth show:

(a) blue shift (b) red shift (c) yellow shift (d) green shift

cxxii). The vibrations of a factory floor is due to:

(a) free oscillations (b) damped oscillation

(c) forced oscillations (d) none of these

cxxiii). Motorcycle safety helmet extends the time of collision hence decreasing the:

(a) chance of collision (b) force acting (c) velocity (d) impulse

cxxiv). During long jump, athlete runs before taking the jump by doing so he:

(a) provide him a larger inertia (b) decrease his inertia

cxxv). Tidal energy and wind energy is used to generate:

(a) current (b) friction (c) electricity (d) fossil fuel

cxxvi). The slope of work time graph represents:

(a) power (b) P.E (c) K.E (d) all of these

cxxvii).A moving body may not has:

(a) K.E (b) impulse (c) momentum (d) velocity

cxxviii). Dimension of angular frequency is same as that of:

(a) frequency (b) velocity (c) tension (d) angular acceleration

cxxix). A body moving along a circular path completes a round trip. The distance is:

(a) 4 R (b) 2 R (c) zero (d) none of these

cxxx). The value of escape velocity is:

(a) 10.2km/sec (b) 11.2km/sec (c) 11.2m/sec (d) 7.9km/sec

cxxxi). Close orbiting satellites orbit the earth at a height of:

(a) 200km (b) with in hook (c) 36000km (d) none of these

cxxxii).The mass of a body weighing 39.2N in kg is:

(a) 4 (b) 5 (c) 3 (d) 6

cxxxiii). Total change in momentum of an isolated system is:

(a) positive (b) zero (c) negative (d) none of these

cxxxiv). Newton’s first law of motion gives definition of:

(a) mass (b) force (c) acceleration (d) speed

cxxxv).Gravity performs zero work when body moves:

(a) vertically (b) horizontally (c) at 60^o with vertical (d) none of these

cxxxvi). Above critical velocity the fluid flow becomes:

(a) streamline (b) turbulent (c) laminar (d) regular

cxxxvii). When a certain vector is multiplied by -1, the direction changes by:

(a) 90^o (b) 180^o (c) 120^o (d) 160^o

cxxxviii). The magnitude of is:

(a) 0 (b) 1 (c) -1 (d) 2i

cxxxix). lies in quadrant:

(a) 1^st (b) 2^nd (c) 3^rd (d) 4^th

cxl). If there are five objects in equilibrium than _______ object selected at a time to apply conditions of equilibrium:

(a) one (b) two (c) four (d) five

cxli). Everything in the vastness of space is in a sate of:

(a) parabola motion (b) hyperbola motion

cxlii). When and both has apposite signs then it means:

(a) speed increasing (b) zero speed

cxliii). For spherical earth, the ballistic trajectory should be:

(a) elliptical (b) circular (c) straight (d) parabolic

cxliv). Inertial and gravitational masses are:

(a) identical (b) opposite (c) proportional (d) none of these

cxlv). When a body moves along a circular path its velocity:

(a) remains same (b) becomes zero

cxlvi). The diver spins faster when moment of inertia becomes:

(a) constant (b) greater (c) smaller (d) both ‘a’ and ‘b’

i). Which of the following is not a unit of energy:

(a) joule (b) kilowatt (c) ev (d) kwh

ii). The number of milli seconds in a year is:

(a) 3.1536x10⁹ (b) 3.1536x10⁷ (c) 3.1536x10¹⁰ (d) 3.1536x10^-9

iii). The resultant of two forces 30N and 40N acting at an angle of 180^o with each other is:

(a) 30N (b) 40N (c) 50N (d) 10N

iv). The angle between and is:

(a) 0^o (b) 60^o (c) 90^o (d) 180^o

v). If , then will be:

(a) 90^o (b) 75^o (c) 60^o (d) 45^o

vi). The horizontal range (R) and maximum range (R_max) of a projectile are related as:

(a) R=R_maxSin² (b) R=R_maxSin (c) 2R=R_maxSin² (d) R=R_maxSin2

vii). A particle moves in a circle. What is the ratio between its magnitude of displacement and total distance covered:

(a) 1 (b) 2 (c) 0 (d) 2

viii). Two revolutions are equal to:

(a) 4 radians (b) 700^o (c) radians (d) none of these

ix). If the volume of a sphere increases without changing the mass then terminal velocity:

(a) remains same (b) increases (c) decreases (d) none of these

x). Unit of coefficient of viscosity:

(a) Nm^-2s (b) Kgm^-1s^-1 (c) both a&b (d) Ns^-2m

xi). The acceleration of a projection on the diameter for a particle moving along a circle is:

(a) w²x (b) wx² (c) –w²x (d) –wx²

xii). If mass of the spring system is doubled then frequency becomes:

(a) 1.4 times (b) 0.7 times (c) 2 times (d) 0.5 times

xiii). The effect of loading the prongs of a tuning fork with wax is to:

(a) increase the frequency (b) decrease the frequency

xiv). The central spot of the Newton’s rings is dark, due to phase difference:

(a) zero (b) rad (c) 2 rad (d) /2 rad

xv). Which of the following has the longest wavelength:

(a) blue light (b) gamma rays (c) x-rays (d) red light

xvi). Power of a lens of focal length 10cm is:

(a) 1 diopter (b) 10 diopter (c) 0.1 diopter (d) none of these

xvii). Efficiency of carnot engine is:

(a) 50% (b) 100% (c) minimum (d) maximum

cxlvii). The minimum number of un-equal forces whose vector sum can be zero:

(a) 2 (b) 4 (c) 3 (d) none of these

cxlviii).Torque has maximum value if angle between and is:

(a) 0^o (b) 45^o (c) 90^o (d) 180^o

cxlix). The horizontal part of projectile motion in the absence of air drag is:

(a) uniform (b) constant (c) non accelerated (d) all of these

cl). Total change in momentum of an isolated system is:

(a) positive (b) zero (c) negative (d) none of these

cli). The acceleration of a projectile along x-axis is:

(a) zero (b) increases (c) decreases (d) equal to ‘g’

clii). One watt hour is equal to:

(a) 36x10¹²J (b) 3.6x10³J (c) 36x10⁶J (d) 3.6x10⁶J

cliii). Which of the following is renewable source of energy:

(a) coal (b) natural gas (c) uranium (d) sun light

cliv). One radian is equal to:

(a) 57.3^o (b) 67.3^o (c) 77.3^o (d) 360^o

clv). The diver spins faster when moment of inertia becomes:

(a) smaller (b) greater (c) double (d) zero

clvi). The S.I unit of viscosity is:

(a) Nm^-2S (b) Kgm^-1S^-2 (c) Kgm^-1S^-1 (d) both (a) and (c)

clvii). According to Bernoulli’s equation pressure should be high if:

(a) speed is high (b) speed is low (c) both (a) and (b) (d) none of these

clviii). In an isolated mass spring system total energy is:

(a) variable (b) constant (c) low (d) high

clix). The number of vibrations per second is called:

(a) amplitude (b) time period (c) revolutions (d) none of these

clx). At which of the following places, motion of pendulum will become the fastest:

(a) Lahore (b) Murree (c) K-2 (d) Karachi

clxi). Vibratory or oscillatory motion is always under:

(a) an applied force (b) an elastic restoring force & inertia

clxii). The time taken to complete one vibration is called:

(a) displacement (b) time period (c) amplitude (d) frequency

clxiii). The distance between two consecutive node or antinodes is:

(a) (b) /4 (c) 2 (d) /2

clxiv). A force of 10N is acting along Z-axis its component along x-axis and y-axis is:

(a) 5N,8N (b) 3N,4N (c) 5N each (d) Zero

clxv). Torque is also called as:

(a) Moment of inertia (b) Moment arm (c) Moment of force (d) Angular velocity

clxvi). Slope of velocity time graph gives:

(a) Distance (b) Displacement (c) Acceleration (d) None of these

clxvii). The range of projectile is directly proportional to the:

(a) Sin 2 (b) Sin² (c) Cos² (d) Tan²

clxviii).Ethanol is the replacement of :

(a) Kerosene Oil (b) Gas Oil (c) Gasoline Oil (d) Refinery Oil

clxix). When the speed of moving body is doubled then its:

(a) K.E increases 6-time (b) K.E is doubled

clxx). Which theory of gravitation is better:

(a) Newton (b) Einstein (c) Compton (d) Plank

clxxi). The value of angular momentum is maximum when is:

(a) 60^o (b) 45^o (c) 0^o (d) 90^o

clxxii). A fog droplet falls vertically through air with an acceleration:

(a) Greater than g (b) Less than g (c) Equal to g (d) Equal to zero

clxxiii).The SI unit of coefficient of viscosity is:

(a) Kg m^-1 s^-1(b) Nm²S² (c) Kg m2s^-2 (d) Kg ms^-2

clxxiv).A motion which repeats itself in equal intervals of time is:

(a) Rotartory motion (b) Periodic motion (c) Translatory motion (d) Osicllatory

clxxv). The velocity of a body is minimum at:

(a) Mean position (b) Extreme position

clxxvi).Shock absorber in automobiles is a practical form of:

(a) SHM (b) Damped (c) Pascal’s law (d) All of these

clxxvii). The distance between two successive crests or troughs is called:

(a) Area (b) Displacement (c) Amplitude (d) Wave length

clxxviii). With the rise of temperatures the velocity of sound is:

(a) Increased (b) Decreased (c) Remains constant (d) Becomes zero

clxxix).Pure note means:

(a) Mixture frequency (b) Quantum frequency (c) Single frequency (d) None of these

clxxx). The amplitude of pound waves determines its

(a) Pitch (b) Loudness (c) Interference (d) None of these

clxxxi).The perpendicular distance from the line of action of force to the pivot is called:

(a) Displacement (b) Force (c) Momentum (d) Moment arm

clxxxii). is equal to:

(a) (b) 1 (c) 2 (d) 0

clxxxiii). In a projectile motion, the horizontal range R depends upon:

(a) Initial velocity (b) Angle of projection (c) Both ‘a’ and ‘b’ (d) None of these

clxxxiv). With the help of velocity time graph, we can find:

(a) Distance (b) Acceleration (c) Momentum (d) Both a&b

clxxxv). The loss of P.E is equal to gain in K.E, is true only if there is no:

(a) Weight (b) Gravity (c) Friction (d) None of these

clxxxvi). Geysers usually occurs in:

(a) Cold regions (b) Hot regions (c) Volcanic regions (d) None of these

clxxxvii). Height of closest orbit of the satellite above the earth is:

(a) 300Km (b) 400Km (c) 500Km (d) 250Km

clxxxviii). If a particle moves in a circle of radius then the angle between and is:

(a) (b) (c) (d)

clxxxix). Blood is an incompressible fluid having a density nearly equal to that of:

(a) Milk (b) Water (c) Oil (d) None of these

cxc). Bernoulli’s equation is based upon the law of conservation of:

(a) Momentum (b) Mass (c) Energy (d) All of these

cxci). A body of mass ‘m’ is falling downward in a viscous medium with terminal velocity V, the net force on the body is

(a) 6 (b) Zero (c) Mg (d) Mg-6

cxcii). If mass attached to spring increases, then its time period:

(a) Decrease (b) Increases (c) No change (d) All of these

cxciii). When a particle is moving along circular path its projection along the diameter executes:

(a) S.H.M (b) Linear motion (c) Angular motion (d) None of these

cxciv). The wave form of SHM is:

(a) Cosine wave (b) Square wave (c) Sine wave (d) None of these

cxcv). The distance between two consecutive node is:

(a) (b) (c) (d)

cxcvi). The speed of sound at 30^o is approximately equal to:

(a) 333 rns^-1 (b) 280 rns^-1 (c) 332 (d) 350 rns^-1

cxcvii). If 30 waves per second pass through a medium at 30 m/s, wavelength of these waves is:

(a) 30m (b) 15m (c) 1m (d) 280m

xviii).

(a) (b) (c) (d)

this is called:

(a) commutative law (b) associative law (c) distributive law (d) none of these

xix). If a vector makes an angle with x-axis, the magnitude of its, x-component is:

(a) A_y=ASin (b) A_x=ACos (c) both a & b (d) none of these

xx). Unit vector is used to specify:

(a) direction of a vector (b) position of a vector (c) magnitude of a vector (d) none of these

xxi). An example of a vector quantity:

(a) speed (b) work (c) acceleration (d) mass

xxii). The turning effect of a force is called:

(a) momentum (b) inertia (c) torque (d) impulse

xxiii). Conventionally anti-clock wise torque is taken as:

(a) zero (b) negative (c) positive (d) none of these

xxiv). When the velocity of a body is increases at constant rate, it is said to be moving with:

(a) constant velocity (b) constant speed (c) constant displacement (d) none of these

xxv). The product of mass and velocity is called:

(a) momentum (b) impulse (c) force (d) power

xxvi). The minimum velocity of projectile during its path is at:

(a) Initial point (b) final point

xxvii). In which pair of an angles the ranges are equal:

(a) 90,45 (b) 30,60 (c) 45,60 (d) 55,95

xxviii). In gravitational field the work done is independent of:

(a) force (b) path followed by body (c) direction (d) none of these

xxix). The y-component of velocity in projectile motion changes due to:

(a) air friction (b) gravity (c) both (a) and (b) (d) applied force

xxx). A vector which gives the direction of a given vector is called:

(a) unit vector (b) position vector (c) null vector (d) negative vector

xxxi). Which one of the following is a scalar quantity:

(a) mass (b) displacement (c) force (d) torque

xxxii). The angle between two rectangular components:

(a) 60^o (b) 90^o (c) 180^o (d) 270^o

xxxiii). A vector which has zero magnitude is called:

(a) null vector (b) unit vector (c) resultant vector (d) position vector

xxxiv). Impulse is equal to the:

(a) change in momentum (b) change of force (c) change of time (d) change of velocity

xxxv). Newton’s first law of motion is also called:

(a) law of inertia (b) law of momentum (c) ampere’s law (d) none of these

xxxvi). The S.I unit of torque is given by:

(a) N.m² (b) N.m (c) N/m² (d) none of these

xxxvii). A body will be in translational equilibrium if:

(a) (b) (c) both a & b (d) none of these

xxxviii). Range of the projectile is maximum at an angle of:

(a) 30^o (b) 45^o (c) 60^o (d) 90^o

xxxix). The time of projectile can be determined by expression:

(a) t= (b) t= (c) t = (d)t =

xl). The work done will be negative when angle between force and displacement is:

(a) (b) (c) (d)

xli). The area under force displacement curve gives:

(a) energy (b) work (c) momentum (d) torque

xlii). An example of a scalar quantity:

(a) displacement (b) acceleration (c) force (d) speed

xliii). A vector which has magnitude one is called:

(a) null vector (b) unit vector (c) resultant vector (d) position vector

xliv). The expression is for:

(a) unit vector (b) position vector (c) null vector (d) negative vector

xlv). Select the correct answer:

(a) (b) (c) (d)

xlvi).

(a) (b) (c) (d)

A body will be in complete equilibrium if:

(a) (b) (c) both a & b (d) none of these

xlvii). The direction of torque is determined by:

(a) head to tail rule (b) right hand rule (c) left hand rule (d) none of these

xlviii). The rate of change of velocity is called:

(a) displacement (b) velocity (c) speed (d) acceleration

xlix). The unit of velocity in S.I system is:

(a) m/s (b) m/s²(c) m-s (d) none of these

l). The path followed by the projectile is called:

(a) height of projectile (b) range of projectile (c) trajectory (d) None of these

li). Height and range of projectile are equal at angle:

(a) (b) (c) (d)

lii). The S.I unit of work is:

(a) Newton (b) Nm² (c) Joule (d) Kelvin

liii). The total work done around a closed path in gravitational field is:

(a) maximum (b) zero (c) constant (d) None of these

cxcviii). When a vector is multiplied by a negative number its direction

(a) does not change (b) remains same (c) change by 180^o (d) become vertical

cxcix). In the self cross product, the angle is

(a) 0^o (b) 45^o (c) 90^o (d) 180^o

cc). The minimum number of unequal forces whose vector sum can be zero is

(a) 3 (b) 2 (c) 1 (d) 4

cci). If the velocity of a body is increasing, its acceleration is

(a) positive (b) negative (c) both (a), (b) (d) None of these

ccii). Change in momentum is called

(a) impulse (b) force (c) torque (d) momentum

cciii). Original source of biomass is

(a) fossil source (b) moon (c) sun (d) All of these

cciv). Power of colour T.V is (approximate)

(a) 130 watts (b) 120 watts (c) 110 watts (d) 150 watts

ccv). SI unit of angular displacement is

(a) meter (b) degree (c) rotation (d) radian

ccvi). The moment of Inertia of a body depends on

(a) volume of body (b) K.E of body

ccvii). Centripetal force performs

(a) maximum work (b) minimum work (c) negative work (d) zero work

ccviii). The direction of a vector in space is specified by

(a) one angle (b) three angles (c) two angles (d) four angles

ccix). If , then lies in

(a) 1^st quadrant (b) 3^rd quadrant (c) 2^nd quadrant (d) 4^th quadrant

ccx). When the line of action of the applied force passes through the pivot point, then torque is

(a) maximum (b) minimum (c) zero (d) both (b) and (c)

ccxi). The area under the curve of the velocity time graph is equal to

(a) slope (b) distance (c) velocity (d) acceleration

ccxii). Frictional Force is a

(a) conservative force (b) non-conservative force

ccxiii). Water flows out from a pipe at 3kgs^-1 and its velocity changes from 5ms^-1 to zero, then force is

(a) 10N (b) 5N (c) 20N (d) 15N

ccxiv). The field in which work done along a closed path be zero, is called a

(a) gravitational field (b) conservative field (c) magnetic field (d) electric field

ccxv). The tides raise the water in the sea roughly twice a day, are due to gravity of

(a) sun (b) earth (c) moon (d) all of these

ccxvi). The angular displacement is given as

(a) (b) (c) (d) All of these

ccxvii). The moment of inertia of a coin is

(a) (b) (c) (d)

ccxviii). When a wave enter from one medium to other, which remain constant:

(a) velocity (b) wave length (c) frequency (d) all of these

ccxix). Maximum number of beats is audio able to human being:

(a) 7 (b) 5 (c) 10 (d) 15

ccxx). When a jet fighter moves faster than air, a huge sound is produced called:

(a) big – bang (b) ultra – boom (c) sonic boom (d) infra - boom

ccxxi). Tow pipes one is open and other is closed at one end, have same length, the ratio of their fundamental frequencies is:

(a) 1:2 (b) 2:1 (c) 3:1 (d) 4:1

ccxxii). If mass attached with a spring having S.H.M is doubled, its time period will be:

(a) 2T (b) (c) T (d) 4T

ccxxiii). Dimensions of spring constant ‘K’ is:

(a) [MLT^-2] (b) [M^oT^-2] (c) [MT^-2L^o] (d) none of these

ccxxiv). A physical system undergoing forced vibration is known as:

(a) Harmonic oscillator (b) driven harmonic oscillator

ccxxv). If a watch with a wound spring is taken into the moon, it:

(a) run faster (b) runs slower (c) does not work (d) shows no change

ccxxvi). Water waves are:

(a) longitudinal waves (b) transverse waves (c) both a & b (d) none of these

ccxxvii). In a standing wave, the particle velocity at the node is:

(a) maximum (b) minimum (c) zero (d) constant

ccxxviii). When the amplitude of a wave becomes double, its energy becomes:

(a) double (b) four times (c) one half (d) nine times

ccxxix). The amplitude of a vibrating body at resonance in vacuum is:

(a) minimum (b) maximum (c) zero (d) infinite

ccxxx). Stars moving away from the earth show a:

(a) yellow shift (b) blue shift (c) red shift (d) violet shift

ccxxxi). A mechanical wave is represented by:

(a) light (b) heat (c) sound (d) E.M wave

ccxxxii). A thin layer of oil on the surface of water appears coloured because of:

(a) Interference (b) Reflection (c) Polarization (d) Refraction

ccxxxiii). In newton’s ring:

(a) The central spot is bright (b) The central spot is dark

ccxxxiv). When light enters glass (or any other medium) it suffers a change in:

(a) Wave length only (b) Frequency only (c) Velocity only (d) Both a & c

ccxxxv). In monochromatic red light a blue book will appear:

(a) Blue (b) Purple (c) Black (d) Red

ccxxxvi). Polarization property shows that light waves are:

(a) Longitudinal waves (b) Compressional waves

ccxxxvii). The concept of corpuscular nature of light was given by:

(a) Newton (b) Huygen (c) Thomas young (d) Maxwell

ccxxxviii). When waves pass from one medium into another:

(a) Their wave length changes (b) Frequency unchanged

ccxxxix). The index of refraction of a medium depends on:

(a) Frequency of light (b) Wave length of light

ccxl). The wave length of x-rays is of the order of:

(a) 10A^o (b) 1000 A^o (c) 1A^o (d) 100A^o

ccxli). Light waves are:

(a) Compressional (b) Electromagnetic (c) Longitudinal (d) Mechanical

ccxlii). When is small then tan is equal to:

(a) Sin2 (b) Cos2 (c) Sin (d) Cos

ccxliii). When the object is placed at 2F of convex lens then the image formed behind the lens will be:

(a) At the focus (b) At 2F (c) Beyond 2F (d) between F & 2F

ccxliv). Power of a lens of focal length 1m is:

(a) 0.5 dioptre (b) 1.5 dioptre (c) 1 dioptre (d) None of these

ccxlv). The final image obtained by astronomical telescope is:

(a) Inverted (b) Virtual (c) Magnified (d) All of these

ccxlvi). Interference and diffraction support the:

(a) Quantum nature of light (b) Complex nature of light

ccxlvii). A thin layer of oil on the surface of water appears coloured because of:

(a) Interference (b) Reflection (c) Polarization (d) Refraction

ccxlviii). When light enters glass it suffers a change in:

(a) (b) f (c) V (d) All of these

ccxlix). At a very large distance from a point of source we get:

(a) A spherical wave front (b) A plane wave front

ccl). Refractive index of glass is:

(a) 1.33 (b) 1.5 (c) 2.5 (d) 1

ccli). For gratting equation, which value of n is impossible for d=4

(a) 5 (b) 4 (c) 3 (d) 2

cclii). The wave nature of light was proposed by:

(a) Michelson (b) Young (c) Newton (d) Huygen

ccliii). Sound waves are:

(a) Compressional (b) Electromagnetic (c) Longitudinal (d) Both a&c

ccliv). Michelson’s interferometer works on the principle of:

(a) Interference of light (b) Diffraction of light

cclv). The example of optically active crystal is:

(a) Nacl (b) Germanium (c) Si (d) None of these

cclvi). The phase difference between two points of wave front is:

(a) Zero (b) /2 (c) (d) 2n

cclvii). The find image obtained by microscope is:

(a) Inverted (b) Real (c) Virtual (d) Both a&c

cclviii). Distance of near point from the normal eye is:

(a) 2.5cm (b) 25cm (c) 25m (d) 50cm

cclix). The magnifying power of a convex lens of focal length 5cm is equal to:

(a) 5 (b)6 (c) 4 (d) 8

Friday, 23 February 2018

2nd year Physics Important MCQs Solved

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