1. A ball is thrown downward on the 30° inclined plane so that when it rebounds perpendicular to the incline it has a velocity of vA = 40 ft/s. Determine the distance R where it strikes the plane at B.

A. R = 66.3 ft B. R = 99.4 ft C. R = 172.1 ft D. R = 344 ft

Answer - Option A
2. A train travels along a horizontal circular curve that has a radius of 200 m. If the speed of the train is uniformly increased from 30 km/h to 45 km/h in 5 s, determine the magnitude of the acceleration at the instant the speed of the train is 40 km/h.

A. a = 0.617 m/[latex]{s}^{2}[/latex] B. a = 1.037 m/[latex]{s}^{2}[/latex] C. a = 1.451 m/[latex]{s}^{2}[/latex] D. a = 0.833 m/[latex]{s}^{2}[/latex]

Answer - Option B
3. A car is traveling at a speed of 80 ft/s when the brakes are suddenly applied, causing a constant deceleration of 10 ft/[latex]{s}^{2}[/latex]. Determine the time required to stop the car and the distance traveled before stopping.

A. t = 8 s, s = 800 ft B. t = 8 s, s = 320 ft C. t = 4 s, s = 240 ft D. t = 4 s, s = 40

Answer - Option B
4. A package is dropped from the plane which is flying with a constant horizontal velocity of vA = 150 ft/s at a height h = 1500 ft. Determine the radius of curvature of the path of the package just after it is released from plane at A.

A. p2 = 9860 ft B. p2 = 3000 ft C. p2 = 1500 ft D. p2 = 8510 ft

Answer - Option D

5. When the motorcyclist is at A he increases his speed along the vertical circular parth at the rate of v = (0.3t)ft/[latex]{s}^{2}[/latex], where t is in seconds. If he starts from rest when he is at A, determine his velocity and acceleration when he reaches B.

A.v = 51.1 ft/, a[latex]{s}^{2}[/latex] = 9.83 ft/[latex]{s}^{2}[/latex] B.v = 51.1 ft/[latex]{s}^{2}[/latex], a = 8.18 ft/[latex]{s}^{2}[/latex] C.v = 51.1 ft/[latex]{s}^{2}[/latex], a = 10.31 ft/[latex]{s}^{2}[/latex] D.v = 51.1 ft/[latex]{s}^{2}[/latex], a = 8.69 ft/[latex]{s}^{2}[/latex]

Answer - Option C

1. An electron and a proton are moving under the influence of mutual forces. In calculating the change in the kinetic energy of the system during motion, one ignores the magnetic force of one on another. This is because.

A.the two magnetic forces are equal and opposite, so they produce no net effect. B.the magnetic forces do no work on each particle. C.the magnetic forces do equal and opposite (but non-zero) work on each particle. D.the magenetic forces are necessarily negligible.

Answer - Option C
2. A proton is kept at rest. A positively charged particle is released from rest at a distance d in its field. Consider two experiments; one in which the charged particle is also a proton and in another, a positron. In the same time t, the work done on the two moving charged particles is

A. same as the same force law is involved in the two experiments. B. less for the case of a positron, as the positron moves away more rapidly and the force on it weakens. C. more for the case of a positron, as the positron moves away a larger distance. D. same as the work done by charged particle on the stationary proton

Answer - Option C
3. A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man during the process is

A. constant and equal to mg in magnitude. B. constant and greater than mg in magnitude. C. variable but always greater than mg. D. at first greater than mg, and later becomes equal to mg.

Answer - Option D
4. A bicyclist comes to a skidding stop in 10 m. During this process, the force on the bicycle due to the road is 200N and is directly opposed to the motion. The work done by the cycle on the road is

A. + 2000J B. – 200J C. zero D. – 20,000J

Answer - Option C
5. A body is falling freely under the action of gravity alone in vacuum. Which of the following quantities remain constant during the fall?

A. Kinetic energy. B. Potential energy. C. Total mechanical energy. D. Total linear momentum.

Answer - Option C

1. A ball is travelling with uniform translatory motion. This means that

A. it is at rest. B. the path can be a straight line or circular and the ball travels with uniform speed. C. all parts of the ball have the same velocity (magnitude and direction) and the velocity is constant. D. the centre of the ball moves with constant velocity and the ball spins about its centre uniformly.

Answer - Option C
2. A metre scale is moving with uniform velocity. This implies (a) the force acting on the scale is zero, but a torque about the centre of mass can act on the scale. (b) the force acting on the scale is zero and the torque acting about centre of mass of the scale is also zero. (c) the total force acting on it need not be zero but the torque on it is zero. (d) neither the force nor the torque need to be zero.

A. the force acting on the scale is zero, but a torque about the centre of mass can act on the scale. B. the force acting on the scale is zero and the torque acting about centre of mass of the scale is also zero. C. the total force acting on it need not be zero but the torque on it is zero D. neither the force nor the torque need to be zero.

Answer - Option B
3. Conservation of momentum in a collision between particles can be understood from

A. conservation of energy. B. Newton’s first law only. C. Newton’s second law only. D. both Newton’s second and third law.

Answer - Option C
4. A hockey player is moving northward and suddenly turns westward with the same speed to avoid an opponent. The force that acts on the player is

A. frictional force along westward B. muscle force along southward. C. frictional force along south-west. D. muscle force along south-west.

Answer - Option C
5. A body of mass 2kg travels according to the law x(t ) = pt + qt2 + rt3 where p = 3 [latex]{ms}^{-1}[/latex], q = 4 [latex]{ms}^{-2}[/latex] and r = 5 ms-3. The force acting on the body at t = 2 seconds is

A.136 N B.134 N C.158 N D.68 N

Answer - Option A

1. Unit of reduction factor is

A.ampere B.ohm C.tesla D. weber

Answer - Option A
2. The numerical value of a given quantity is

A. independent of unit B. directly proportional to unit C. inversely proportional to unit D. directly proportional to the square root of the unit

Answer - Option C
3. Lumen is the unit of

A. illuminating power B. luminous flux C. luminous intensity D. None of these

Answer - Option B
4. The physical quantity which does not have the same dimensions as the other three is

A. spring constant B. surface energy C. surface energy D. acceleration due to gravity

Answer - Option D
5. Which of the following quantities has units but not dimensions?

A. Displacement B. Angle C. Couple D. Speed

Answer - Option B

1. By what percentage does the kinetic energy increase, if the linear momentum is increased by 50%

A. 25% B. 50% C.100% D. 125%

Answer - Option D
2. What is the angular momentum vector in an orbital motion?

A. The vector is perpendicular to the orbital plane B. The vector is along the radius vector C. The vector is parallel to the linear momentum D. The vector is in the orbital plane

Answer - Option A
3. On which of the following factor does the moment of inertia of an object not depend upon

A. Axis of rotation B. Angular velocity C.Distribution of mass D. Mass of an object

Answer - Option A
4. What is the frictional force of a round object with mass M and radius R which rolls down the inclined plane without slipping along the way

A. There is a decrease in the rotational motion B. There is a decrease in the rotational and transnational motion C. There is a conversion of transnational motion into rotational motion D. Kinetic energy is converted into heat

Answer - Option C
Explanation -
5. When does the moment of inertia of a body come into the picture?

A. When the motion is rotational B.When the motion is linear C.When the motion is along a curved path D. None of the above

Answer - Option A

1. The earth is an approximate sphere. If the interior contained matter which is not of the same density everywhere, then on the surface of the earth, the acceleration due to gravity

A. will be directed towards the centre but not the same everywhere. B. will have the same value everywhere but not directed towards the centre. C. will be same everywhere in magnitude directed towards the centre. D. cannot be zero at any point

Answer - Option D
2. As observed from earth, the sun appears to move in an approximate circular orbit. For the motion of another planet like mercury as observed from earth, this would

A. be similarly true B. not be true because the force between earth and mercury is not inverse square law. C. not be true because the major gravitational force on mercury is due to sun. D. not be true because mercury is influenced by forces other than gravitational forces.

Answer - Option C
3. Different points in earth are at slightly different distances from the sun and hence experience different forces due to gravitation. For a rigid body, we know that if various forces act at various points in it, the resultant motion is as if a net force acts on the c.m. (centre of mass) causing translation and a net torque at the c.m. causing rotation around an axis through the c.m. For the earth-sun system (approximating the earth as a uniform density sphere)

A. the torque is zero. B. the torque causes the earth to spin. C. the rigid body result is not applicable since the earth is not even approximately a rigid body. D. the torque causes the earth to move around the sun.

Answer - Option A
4. Satellites orbiting the earth have finite life and sometimes debris of satellites fall to the earth. This is because,

A. the solar cells and batteries in satellites run out. B. the laws of gravitation predict a trajectory spiraling inwards. C. of viscous forces causing the speed of satellite and hence height to gradually decrease. D. of collisions with other satellites.

Answer - Option C
5. Both earth and moon are subject to the gravitational force of the sun. As observed from the sun, the orbit of the moon

A. will be elliptical. B. will not be strictly elliptical because the total gravitational force on it is not central. C. is not elliptical but will necessarily be a closed curve. D. deviates considerably from being elliptical due to influence of planets other than earth.

Answer - Option B

1. Modulus of rigidity of ideal liquids is

A. infinity B. zero C. unity D. some finite small non-zero constant value.

Answer - Option B
2. The maximum load a wire can withstand without breaking, when its length is reduced to half of its original length, will

A. be double B. be half. C. be four times. D. remain same.

Answer - Option D
3. The temperature of a wire is doubled. The Young’s modulus of elasticity

A.will also double B.will become four times. C.will remain same. D.will decrease

Answer - Option D
4. A spring is stretched by applying a load to its free end. The strain produced in the spring is

A. volumetric. B. shear C. longitudinal and shear. D.longitudinal.

Answer - Option C
5.The stress-strain graphs for two materials are shown in Fig.9.3 (assume same scale).

A. Material (ii) is more elastic than material (i) and hence material (ii) is more brittle. B. Material (i) and (ii) have the same elasticity and the same brittleness. C. Material (ii) is elastic over a larger region of strain as compared to (i). D. Material (ii) is more brittle than material (i).

Answer - Option C

1. The energy required to increase the temperature of one pound of water one degree Fahrenheit is known as a Btu. For what does this abbreviation stand?

A.Big Temperature Unit B.Brenwald’s Thermal Unit C.Britain Temperature Unification D.British Thermal Unit

Answer - Option D
2. What is the term for the amount of disorder in a system?

A.Enthalpy B.Chaos C.Entropy D.Disequilibrium

Answer - Option C
3.A Carnot engine, having an efficiency of η =1/10 as heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is [AIPMT 2015]

A. 100 J B. 99 J C. 90 J D. 1 J

Answer - Option C
4. A gas is compressed isothermally to half its initial volume. The same gas is compressed separately through an adiabatic process until its volume is again reduced to half. Then

A. Compressing the gas isothermally or adiabatic ally will require the same amount of work B. Which of the case (whether compression through isotherm or through adiabatic process) requires more work will depend upon the atomicity of the gas C. Compressing the gas isothermally will require more work to be done D. Compressing the gas through adiabatic process will require more work to be done

Answer - Option D
5. An ideal gas is compressed to half its initial volume by means of several processes. Which of the process results in the maximum work done on the gas?

A. Isothermal B. Adiabatic C. Isobaric D. Isochoric

Answer - Option B

1. On which factor does the average kinetic energy of gas molecules depend?

A. Nature of the gas B. Temperature C. Volume D. Mass

Answer - Option B
Explanation -The average kinetic energy of a gas molecule depends only on the absolute temperature of the gas and is directly proportional to it.
2. What is the average velocity of the molecules of an ideal gas?

A. Infinity B. Constant C. Unstable D. Zero

Answer - Option C
Explanation - The average velocity of the molecules of an ideal gas is zero because the molecules possess all sorts of velocities in all possible directions so their vector sum and hence the average is zero.
3. Cooking gas containers are kept in a lorry moving with uniform speed. The temperature of the gas molecules inside will ___________

A. Increase B. Decrease C. Remain the same D. Decreases for some, while the increase for others

Answer - Option C
Explanation - The center of mass of the gas molecules moves with uniform speed along with the lorry. As there is no change in relative motion, the transnational kinetic energy and hence the temperature of the gas molecules will remain the same.
4. At Boyle’s temperature?

A. Joule’s effect is positive B. Van der Waal’s equation becomes zero C. Gases obey Boyle’s law D. Water solidifies

Answer - Option C
Explanation - At Boyle’s temperature, a gas obeys Boyle’s law to a high degree of accuracy. Above and below this temperature, the gas deviates from Boyle’s law.
5. The temperature of gas is held constant, while its volume is decreased. The pressure exerted by the gas on the wall of the container increases, because of its molecules ___________

A. Strike the walls with higher velocities B. Strike the walls with large farce C. Strike the walls more frequently D. Are in contact with the walls for a shorter time

Answer - Option C
Explanation - When the volume is decreased, the gas molecules strike the walls more frequently.

1. A linear harmonic oscillator of force constant 2×106 N/m and amplitude 0.01m has a total mechanical energy of 160J. Its ___________ Explanation: Potential energy = 1/2×kx2 = [latex]\frac{1}{2}[/latex] × 2 × 106 × 0.012 = 100J.

A. Potential energy is 160 J B. Potential energy is zero C. Potential energy is 100J D. Potential energy is 120J

Answer - Option C
Explanation - Potential energy = [latex]\frac{1}{2}[/latex]×[latex]{kx}^{2}[/latex] = [latex]\frac{1}{2}[/latex] × 2 × [latex]{10}^{6}[/latex] × 0.012 = 100J.
2. A body executes simple harmonic motion with amplitude A. At what displacement from the mean position is the potential energy of the body one fourth of its total energy?

A. [latex]\frac{A}{4}[/latex] B. [latex]\frac{A}{2}[/latex] C. 3[latex]\frac{A}{4}[/latex] D. Some other fraction of A

Answer - Option B
Explanation -Potential energy = [latex]\frac{1}{4}[/latex] × Total energy [latex]\frac{1}{2}[/latex] × [latex]{kx}^{2}[/latex]= [latex]\frac{1}{4}[/latex] × [latex]\frac{1}{2}[/latex] × [latex]{ka}^{2}[/latex]x = [latex]\frac{1}{2}[/latex]
3. Time period of a simple pendulum is 2sec. If its length is increased by 4 times, then its period becomes ___________

A. 8 sec B.12 sec C.16 sec D.4 sec

Answer - Option D
4. A second’s pendulum is mounted in a rocket. Its period of oscillation will decrease when rocket is ___________

A. Moving down with uniform acceleration B.b) Moving around the earth in geostationary orbit C. Moving up with uniform velocity D. Moving up with uniform acceleration

Answer - Option A
Explanation -When at rest, T= 2π√([latex]\frac{l}{g}[/latex]) When the rocket moves up with uniform acceleration, T‘=2π√([latex]\frac{l}{(g+a))}[/latex] Clearly, T‘<T.
5. The composition of two simple harmonic motions of equal periods at the right angle to each other and with a phase difference of π results in the displacement of the particle along?

A. Circle B. Figure of eight C. Straight line D. Ellipse

Answer - Option
Explanation - Let x = asinωt y = bsin(ωt + π)= -bsinωt [latex]\frac{x}{a}[/latex] = [latex]\frac{y}{b}[/latex] y = [latex]\frac{-b}{a x × }[/latex] This is the equation of a straight line.

1. What are the basic components of simple electric current?

A.energy source B.connecting wires C. switch D. All the above

Answer - Option D
Explanation - The basics of simple electric current is energy source,switch,connecting wires.
2. Resistant is a measure of materials option to.

A. Voltage B. Current C. Electric Force D.Movement of Protons

Answer - Option B
Explanation - Resistant is a measure of materials option to current.
3. Give the name of materials which contains lots of electrons?

A. insulators B. conductors C. semi conductors D.None of the above

Answer - Option B
Explanation - In an atom the free electrons present at outer most orbit.it can easily flow from atom to another by applying voltage.so it is called conductor.
4. The instrument used for measuring electric current s:

A. galvanometer B. ammeter C. voltmeter D.poteintmeter

Answer - Option B
Explanation - The instrument used for measuring is ammeter.
5. The rate of flow of electric charge is known as:

A.electric potential B.electric resistance C. electric current D.None of the above

Answer - Option C
Explanation -The rate of flow of electric is known as electric current.

1. As per Coulomb’s law, the force of attraction or repulsion between two point charges is directly proportional to the

A. sum of the magnitude of charges B. product of the magnitude of charges C. square of the distance between them D. cube of the distance

Answer - Option B
2. The electric flux through a closed surface depends on the?

A. Magnitude of the charge enclosed by the surface. B. Position of the charge enclosed by the surface C. The shape of the surface D. None of these

Answer - Option A
3. Which of the following is not a good conductor of electricity?

A. Copper B. Silver C. Glass D. Aluminum

Answer - Option C
4. The force per unit charge is known as?

A. Electric current B. Electric field intensity C. Electric potential D. Electric flux

Answer - Option A
5. The unit of electric intensity is?

A. V-m B. N—C/m C. V/m D. N—C

Answer - Option C

1. Who discovered the magnetic field of current?

A. William Gilbert B. Hans Christian Oersted C. Benjamin Franklin D. Charles Augustin de Coulomb

Answer - Option B
2. Magnetic effect of current gives rise to which force?

A. Mechanical B. Friction C. Spring D. Gravitational

Answer - Option A
3. Magnetic effect around a wire is due to:

A. The presence of metal B. Current flowing in it C. Circular loop D. No current in it

Answer - Option B
4. Which of the following utilise magnetic effect of current?

A. Electric motor B. Telephone C. Radio D. All of the above

Answer - Option D
5. What kind of magnetic field lines will be produced around a straight wire carrying current?

A. Bigger circles B. Straight C. Concentrated circles D. Parallel straight

Answer - Option C

1. What happens to the current in a coil while accelerating a magnet inside it?

A.Increases B. Decreases C. Remains constant D. Reverses

Answer - Option A
Explanation - A change in the magnetic field induces an emf. When there is an emf, there has to be current. Hence, when the magnet is moved inside a coil, the current in it increases.
2. What is the consequence of motor effect?

A.Current B.Voltage C.Electromagnetic induction D.EMF

Answer - Option C
Explanation -Motor effect is when a current carrying conductor in a magnetic field experiences a force, hence its consequence is electromagnetic induction.
3. If a conductor 0.2m long moves with a velocity of 0.3m/s in a magnetic field of 5T, calculate the emf induced if magnetic field, velocity and length of conductor are mutually perpendicular to each other.

A. 0.3V B. 0.03V C. 30V D. 3V

Answer - Option A
Explanation - The formula for induced emf is: emf = Blv if B,l,v are perpendicular to each other. Substituting the values of B, l and v from the question, we get emf=0.3V.
4. An E.M.F. can be induced by _________.

A. Change in the magnetic field only B. Change in the area of cross section only C. Change in angle between magnetic field and area only D. Change in the magnetic field, area or angle between them

Answer - Option D
Explanation -emf=-dϕ/dt. We know ϕ flux is the dot product of magnetic field vector and area vector. ϕ=BAcos(θ), hence if either of the three, that is, magnetic field, area or angle changes, the emf will change, flux changes due to which emf can be induced.
5. The total number of magnetic field lines passing through an area is termed as?

A. Voltage B. EMF C. Magnetic flux D. Magnetic flux density

Answer - Option C
Explanation - Number of magnetic field lines passing through an area is magnetic flux.

1. Arrange the following electromagnetic radiations per quantum in the order of increasing energy: A : Blue light B : Yellow light C : X-ray D : Radiowave

A. A, B, D, C B. C, A, B, D C. B, A, D, C D. D, B, A, C

Answer - Option D
2. Out of the following options which one can be used to produce a propagating electromagnetic wave?

A.A changeless particle B. An accelerating charge C.A charge moving at constant velocity D.A stationary charge

Answer - Option B
3. A red LED emits light at 0.1 watt uniformly around it. The amplitude of the electric field of the light at a distance of 1 m from the diode is

A. 1.73 V/m B. 2.45 V/m C. 5.48 V/m D. 7.75 V/m

Answer - Option B
4. The electric and magnetic field of an electromagnetic wave are?

A. in opposite phase and perpendicular to each other B.in opposite phase and parallel to each other C.in phase and perpendicular to each other D. in phase and parallel to each other

Answer - Option C
5. Electromagnetic wave consists of periodically oscillating electric and magnetic vectors ______.

A. in mutually perpendicular planes but vibrating with a phase difference of π B.in mutually perpendicular planes but vibrating with a phase difference of π/2 C.in randomly oriented planes but vibrating in phase D. in mutually perpendicular planes but vibrating in phase

Answer - Option D

1. The direction of propagation of an electromagnetic wave is the same as:

A.E B.E.B C.E×B D.B×E

Answer - Option C
2. Photons always propagate with speed c, but light appears to travel at a speed different from c in dense media. How can we account for this phenomenon?

A. Propagation in media depends on re-radiation by electron-oscillators, which takes a finite time to occur. B. Electron oscillators in the medium introduce a phase change upon re-radiation. C. A medium is a different reference frame to vacuum, so the difference in the observed speed of light is a consequence of relativity. D. Light is slowed down because it does not take a straight line path through the dense medium

Answer - Option B
Explanation -
3. Which of the following is true: I) A reflected beam always has the same irradiance as the incident beam; II) a reflected beam lies in the same plane as the incident beam; III) a reflected beam always makes an angle θ = sin-1(nt/ni) with the normal to the interface.

A. I only. B. I and II. C. II and III. D. II only.

Answer - Option D
4. One reason why the sky appears blue is because:

A.Much more red light than blue light is absorbed by air atoms. B.Red light is reflected by the atmosphere. C. Blue light is scattered to a greater extent than red light. D.Higher energy light waves have more penetration through the atmosphere.

Answer - Option C
5. If μ1 and phi2 are solutions to the wave equation, which of the following is not also a solution, if a and b are real constants.

A. aμ1 + b B. a2bμ2 C. – μ1. D. aμ1μ2

Answer - Option D

1.Energy produced in sun is due to .

A. Motion of electrons and ion B.Chemical reaction C.Fusion reaction D. Fission reaction

Answer - Option C
2. Atoms and Nuclei Class 12 MCQ Question 1. When a β-particle is emitted from a nucleus then its neutron-proton ratio

A. increases B. decreases C. remains unchanged. D. may increase or decrease depending upon the nucleus.

Answer - Option B
Explanation - In P-decay neutron converts to proton with emission of electron and neutrino.
3. The quantity which is not conserved in a nuclear reaction is

A. momentum B.charge C.mass D. none of these

Answer - Option C
Explanation - Energy equivalent to mass detect is released.
4. A radioactive nucleus emits a beta particle. The parent and daughter nuclei are

A. isotopes B. isotones C. isomers D. isobars

Answer - Option D
Explanation - Isobars have the same atomic mass but 1 different atomic number.
5. The radius of a spherical nucleus as measured by electron scattering is 3.6 fm. What is the mass number of the nucleus most likely to be?

A. 27 B. 40 C. 56 D. 120

Answer - Option A

1.Two semiconductor material have exactly the same properties except that material A has a bandgap of 1.0 eV and material B has a bandgap energy of 1.2 eV. The ratio of intrinsic concentration of material A to that of material B is

A. 2016 B. 47.5 C. 58.23 D. 1048

Answer - Option B
2. The intrinsic carrier concentration in silicon is to be no greater than ni = 1 x 10^12 cc. The maximum temperature allowed for the silicon is

A. 300 K B. 360 K C. 382 K D. 364 K

Answer - Option C
3. A capacitor holds 0.03 C of charge when fully charged by a 6V battery. To hold 2C of charge, the voltage required would be

A. 150V B. 100V C. 300V D. 400V

Answer - Option D
4. A particular intrinsic semiconductor has a resistivity of 50 (ohm-cm) at T = 300 K and 5 (ohm-cm) at T = 330 K. If change in mobility with temperature is neglected, the bandgap energy of the semiconductor is

A. 1.9 eV B. 1.3 eV C. 2.6 eV D.2.6 eV

Answer - Option B
5. In germanium semiconductor material at T 400 K the intrinsic concentration is (x 10^14 per cc)

A.26.8 B. 18.4 C.8.5 D. 3.6

Answer - Option C