**Physics Project Class 12 ISC**. We covered all the Physics Project Class 12 ISC MCQs in this post for free so that you can practice well for the exam.

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## Physics Project Class 12 ISC Objective for Students

## If the work done on the system or by the system is zero, which of the following statements for a system kept at a certain temperature is correct?

(a) Change in internal energy of the system is equal to the flow of heat in or out of the system.

(b) Change in internal energy of the system is less than heat transferred.

(c) Change in the internal energy of the system is more than the heat flow.

(d) Cannot be determined.

Option a – Change in internal energy of the system is equal to the flow of heat in or out of the system

## Blowing air with an open pipe is an example of ( Physics Project Class 12 MCQs )

(a) isothermal process

(b) isochoric process

(c) isobaric process

(d) adiabatic process

Option c – isobaric process

## A cycle tire bursts suddenly. This represents an

(a) isothermal process

(b) adiabatic process

(c) isochoric process

(d) isobaric process

Option b – adiabatic process

## Who codified the first two laws of thermodynamics and deduced that the absolute zero of temperature is -273.15°C, leading to the naming of the Kelvin temperature scale?

(a) William Crookes

(b) William Thomson

(c) Luis Alvarez

(d) Robert Hooke

Option b – William Thomson

## The statement that ‘heat cannot flow by itself from a body at a lower temperature to a body at a higher temperature’ is known as ( Physics Project Class 12 MCQs )

(a) Zeroth Law of Thermodynamics.

(b) First Law of Thermodynamics.

(c) Second Law of Thermodynamics.

(d) Third Law of Thermodynamics.

Option c – Second Law of Thermodynamics

## The greenhouse effect is the heating up of the Earth’s atmosphere due to

(a) the ultraviolet rays

(b) gamma rays

(c) the infrared rays

(d) X-rays

Option c – the infrared rays

## Zeroth Law of Thermodynamics leads to

(a) the concept of temperature.

(b) the concept of specific heat.

(c) the concept of internal energy.

(d) None of the above

Option a – the concept of temperature

## The first law of thermodynamics is simply the case of ( Physics Project Class 12 MCQs )

(a) Charles’s Law

(b) Newton’s Law of Cooling

(c) The Law of Heat Exchange

(d) The Law of Conservation of Energy

Option d – The Law of Conservation of Energy

## A weightless string can bear tension up to 3.7 kgwt. A stone of mass 0.5 kg is tied to it and rotated in a vertical circular path of radius 4 m then the maximum angular velocity of the stone :

(A) 2 rad/s

(B) 2.7 rad/s

(C) 3 rad/s

(D) 4 rad/s

Option d – 4 rad/s

## A motorcycle is going on over the bridge of radius R. The driver maintains a constant speed. As the motorcycle is ascending on the bridge, The normal force on it ( Physics Project Class 12 MCQs )

(A) Increases

(B) Remains constant

(C) Decrease

(D) fluctuates

Option c – Decrease

## A frictionless track ends in a circular loop of radius small body slides down the track from a 3 cm. A height h then the minimum value of ‘h’ point ‘p’ at for a body to complete a circular loop :

(A) 3 cm

(B) 7.5 cm

(C) 12.5 cm

(D) 14 cm

Option b – 7.5 cm

## A vertical section of the flyover bridge is in the form of an arc of radius 19.5 m, the truck crosses the bridge without losing contact, and the center of gravity of the truck is 0.5 m above the surface. The maximum speed upto which the truck can be driven is : ( Physics Project Class 12 MCQs )

(A) 7 m/s

(B) 14 m/s

(C) 21 m/s

(D) 28 m/s

Option b – 14 m/s

## A stone attached to a rope of length 1 = 80 cm is rotated at a speed of 240 rpm. At the moment when the velocity is directed upward the rope breaks, to what height does the stone rise further?

(A) 10.3 m

(B) 41.2 m

(C) 20.6 m

(D) 24.9 m

Option c – 20.6 m

## A 4 kg ball swings in a vertical circle at the end of the chord 1 m long. What maximum speed at which it can swing if the chord can sustain maximum tension of 163.6 N? ( Physics Project Class 12 MCQs )

(A) 5.57 m/s

(B) 4 m/s

(C) 10.2 m/s

(D) 31.1 m/s

Option a – 5.57 m/s

## The string of a pendulum of mass m and length 1 is displaced through 90°. The minimum strength of the string to withstand the tension will be :

(A) mg

(B) 2 mg

(C) 3 mg

(D) 4 mg

Option c – 3 mg

## A small body of mass 0.1 kg swings in a vertical circle, at the end of the chord of length 1 m. If the speed is 2 m/s when the chord makes an angle of 30° with vertical. Find the tension in the chord : (g=9.8 m/s²) ( Physics Project Class 12 MCQs )

(A) 0.4 N

(B) 0.85 N

(C) 0.98 N

(D) 1.25 N

Option d – 1.25 N

## A particle of mass 1 kg is moving in the xy plane parallel to the y-axis, with a uniform speed of 5 m/s, 2 m away from the origin. Angular momentum of particle about origin :

(A) 10kg m² s

(B) 5kg m²/s

(C) 2.5kg m²/s

(D) 2kgm²/s

Option a – 10kg m² s

## A bob of mass m attached to an inextensible string of length I is suspended from a vertical support. The bob rotates in a horizontal circle with an angular speed of rad/s about the vertical. About the point of suspension : ( Physics Project Class 12 MCQs )

(A) angular momentum changes in direction but not in magnitude

(B) angular momentum changes both in direction and magnitude

(C) angular momentum is conserved

(D) angular momentum changes in magnitude but not in direction

Option a – angular momentum changes in direction but not in magnitude

## If the radius of the earth is suddenly expanded by ‘n’ times its present value without change in its mass then the length of the day is :

(A) 24 hours

(B) 24/n² hours

(C) n² 24 hours

(D) n 24 hours

Option b – 24/n² hours

## A wheel is rotating with an angular frequency of 500 revolutions per minute on a shaft. The second wheel whose mass and radius are half of the first is coupled with the first wheel then the angular speed of rotation becomes : ( Physics Project Class 12 MCQs )

(A) 500 rpm

(B) 450 rpm

(C) 250 rpm

(D) 125 rpm

Option b – 450 rpm

## A particle of mass m is rotating in a plane in a circular path of radius Y’. Its angular momentum is L. The centripetal force acting on the particle is :

(A) L²/mr³

(B) L²m/r

(C) L²/mr²

(D) L²m/r²

Option a – L²/mr³

## If the ice of polar caps melts the duration of the day will : ( Physics Project Class 12 MCQs )

(A) Increase

(B) 20 gm cm²

(C) Remains the same

(D) cannot be predicted

Option a – Increase

## A particle performs UCM with an angular momentum of L. If the frequency of the particle in motion is doubled and Its KE is halved, the angular momentum becomes :

(A) L/4

(B) L/2

(C) L

(D) 4L

Option a – L/4

## A body starts from rest and completes 20 revolutions in 5 minutes then its number of revolutions in the next 5 minutes : ( Physics Project Class 12 MCQs )

(A) 20 revolutions

(B) 40 revolutions

(C) 60 revolutions

(D) 80 revolutions

Option c – 60 revolutions

## A flywheel of MI 15 kgm² slows down from 90 rad/ s to 40 rad/s in 20 seconds by a constant torque than the number of revolutions during this time interval :

(A) 100 rev

(B) 207 rev

(C) 215 rev

(D) 1300 rev

Option b – 207 rev

## A 0.5 kW motor acts for 10 seconds on an initially non-rotating wheel with a moment of inertia of 1 kg m². What is the angular velocity developed in the wheel neglecting friction? ( Physics Project Class 12 MCQs )

(A) 50 rad/s

(B) 120 rad/s

(C) 70 rad/s

(D) 160 rad/s

Option c – 70 rad/s

## A wheel of the moment of inertia 50 kg m² is rotating at a uniform angular velocity of 5 rad/ s. The torque required to stop it in 2 s has a magnitude :

(A) 125 Nm

(B) 250 Nm

(C) 500 Nm

(D) 1000 Nm

Option a – 125 Nm

## A motor running at a rate of 1200 rpm can supply a torque of 80 Nm. What power does it develop?

(A) 1.6 π kW

(B) 3.2 π kW

(C) 0.8 π kW

(D) 4.8 π kW

Option b – 3.2 π kW

## Starting from rest a fan takes 5 seconds to attain the maximum speed of 400 rpm. Assuming constant acceleration, the time taken by the fan in attaining half the maximum speed is :

(A) 20 s

(B) 10 s

(C) 2.5 s

(D) 2.0 s

Option c – 2.5 s

## A motor of an engine is rotating about its axis with an angular velocity of 100 rev/min. It comes to rest in 15 seconds after being switched off. A number of revolutions made by the motor before coming to rest :

(A) 25 rev

(B) 25 π rev

(C) 12.5 rev

(D) 50 π rev

Option c – 12.5 rev

## The ratio of the accelerations for a solid sphere (mass m and radius R) rolling down an incline of angle ‘0’ without slipping and slipping down the incline without rolling is :

(A) 5 : 7

(B) 2 : 5

(C) 2 : 3

(D) 7 : 5

Option a – 5 : 7

## A body rolls down an inclined plane. If its kinetic energy of rotational motion is 40% of its kinetic energy of translational then the body is :

(A) a Disc

(B) a Hollow sphere

(C) a Ring

(D) a Solid sphere

Option d – a Solid sphere

## The solid cylinder is raised to a certain height on the inclined plane and then rolls down with a velocity of 7 m/s. What is the height to which the cylinder is raised?

(A) 1.2 m

(B) 4.9 m

(C) 3 m

(D) 3.75 m

Option d – 3.75 m

## An inclined plane makes an angle of 30° with the horizontal. A solid sphere rolling down this inclined plane from rest without slipping has linear acceleration equal to

(A) 3g

(B) 5g

(C) 5g/14

(D) 5g/7

Option c – 5g/14

## A solid sphere of mass 2 kg rolls up a 30° incline with an initial speed of 10 m/s. The maximum height reached by the sphere is : (g = 10 m/s²)

(A) 3.5 m

(B) 7 m

(C) 10.5 m

(D) 14 m

Option b – 7 m

## A solid sphere rolls down an inclined plane the percentage of total energy which is rotational K.E. is :

(A) 28%

(B) 72%

(C) 100%

(D) 75%

Option a – 28%

## A solid sphere rolls down an inclined plane, and the percentage of total energy which is translational K.E. is :

(A) 28%

(B) 72%

(C) 100%

(D) 25%

Option b – 72%

## The speed of a solid sphere after rolling from a height of 14 m horizontally is (g = 9.8 m/s²) :

(A) 14 m/s

(B) 7 m/s

(C) 9.8 m/s

(D) 10 m/s

Option a – 14 m/s

## A small spherical liquid drop is moving in a viscous medium. The viscous force does not depend on

(A) the nature of the medium

(B) the density of the medium

(C) the instantaneous speed of the spherical drop

(D) the radius of the spherical drop

Option b – the density of the medium

## If the temperature rises, the coefficient of viscosity of a liquid :

(A) decreases

(B) increases

(C) remains unchanged

(D) increases for some liquids and decreases for others

Option a – decreases

## A metal plate 48 cm² in area rests horizontally on a layer of oil 1 mm thick. A force of 0.25 N applied to the plate horizontally keeps it moving with a uniform speed of 2.5 cm/s. The coefficient of viscosity of the oil is :

(A) 1.083 Ns/m²

(B) 3.083 Ns/m²

(C) 2.083 Ns/m²

(D) 4.083 Ns/m²

Option c – 2.083 Ns/m²

## A plate of area 100 cm² is lying on the upper surface of a 3 mm thick oil film. If the coefficient of viscosity of the oil is 15.5 poise then the horizontal force required to move the plate with a velocity of 3 cm/s will be

(A) 0.155 N

(B) 15.5 N

(C) 1.55 N

(D) 155 N

Option a – 0.155 N

## Stoke’s law is applicable only to :

(A) púre liquids

(B) solutions

(C) non-viscous liquids

(D) viscous liquids

Option d – viscous liquids

## The SI unit of the coefficient of viscosity is :

(A) m/kg-s

(B) kg/m-s²

(C) m-s/kg²

(D) kg/m-s

Option d – kg/m-s

## The coefficient of viscosity of a liquid does not depend upon

(A) the density of the liquid

(B) the temperature of the liquid

(C) the pressure of the liquid

(D) the nature of liquid

Option a – the density of the liquid

## 1 centipoise is equal to :

(A) 0.001 kg/m-s

(B) 1 kg/m-s

(C) 0.1 kg/m-s

(D) 1000 kg/m-s

Option a – 0.001 kg/m-s

## One poise is equivalent to :

(A) 0.1 Pa-s

(B) 0.001 Pa-s

(C) 0.01 Pa-s

(D) 0.0001 Pa-s

Option a – 0.1 Pa-s

## Two sound waves of wavelengths 0.87 m and 0.885 m produce 7 beats per second. The velocity of sound in the air will be near about :

(A) 359 m/s

(B) 340 m/s

(C) 280 m/s

(D) 320 m/s

Option a – 359 m/s

## Eleven tuning forks are arranged in ascending order of frequencies. Each fork produces 8 beats per second with the other. The last fork is an octave of the first. The frequency of the 10th fork is :

(A) 80 Hz

(B) 152 Hz

(C) 172 Hz

(D) 184 Hz

Option b – 152 Hz

## A tuning fork C sounded together with a tuning fork D of frequency 256 Hz emits 2 beats. On loading the tuning fork D the number of beats, heard is 1 per second. The frequency of tuning fork C is :

(A) 257 Hz

(B) 256 Hz

(C) 258 Hz

(D) 254 Hz

Option d – 254 Hz

## Two bodies have frequencies of 252 and 256 vibrations per second respectively. The beat frequency produced when they vibrate together is :

(A) 16

(B) 12

(C) 20

(D) 4

Option d – 4

## When a tuning fork of frequency 341 Hz is sounded with another tuning fork, six beats per second are heard. When the second tuning fork is loaded with wax and sounded with the first tuning fork, the number of beats is two per second. The natural frequency of the second tuning fork is :

(A) 335 Hz

(B) 339 Hz

(C) 343 Hz

(D) 347 Hz

Option d – 347 Hz

## Two tuning forks A and B produce 8 beats per second when sounded together. When B is slightly loaded with wax the beats are reduced to 4 per second. If the frequency of A is 512 Hz, the frequency of B is :

(A) 508 Hz

(B) 516 Hz

(C) 504 Hz

(D) 520 Hz

Option d – 520 Hz

## A source of the sound of frequency 450 cycle/sec is moving, towards a stationary observer with 34 m/s. If the speed of sound is 340 m/s, then the apparent frequency will be :

(A) 410 cycle/sec

(B) 500 cycle/sec

(C) 550 cycle/sec

(D) 450 cycle/sec

Option b – 500 cycle/sec

## Ten tuning forks are arranged in increasing order of frequency in such a way that any two nearest tuning forks produce 4 beats per second. The highest frequency is twice the lowest. The possible highest and lowest frequencies are :

(A) 80 Hz and 40 Hz

(B) 100 Hz and 50 Hz

(C) 44 Hz and 22 Hz

(D) 72 Hz and 36 Hz

Option d – 72 Hz and 36 Hz

## Two tuning forks have frequencies of 450 Hz and 454 Hz respectively. On sounding these forks together, the time interval between successive maximum intensities will be :

(A) 1/4 second

(B) 1/2 second

(C) 1 second

(D) 2 second

Option a – 1/4 second

## A tuning fork gives 5 beats with another tuning fork of frequency 100 Hz. When the first tuning fork is loaded with wax, then the number of beats remains unchanged, then what will be the frequency of the first tuning fork?

(A) 95 Hz

(B) 100 Hz

(C) 105 Hz

(D) 110 Hz

Option c – 105 Hz

## Two tuning forks of frequency 256 and 258 vibrations per second are sounded together, then the time interval between consecutive maxima heard by the observer is :

(A) 2 sec

(B) 0.5 sec

(C) 250 sec

(D) 252 sec

Option b – 0.5 sec

## Two tuning forks A and B vibrating simultaneously produce 5 beats. The frequency of B is 512 Hz. It is seen that if one arm of A is filed, then the number of beats increases. The frequency of A will be :

(A) 502 Hz

(B) 507 Hz

(C) 517 Hz

(D) 522 Hz

Option c – 517 Hz

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