## Q1 The definition of one atomic mass unit and its value is

- (a) 1/12th the mass of an atom of oxygen-16, 1amu = 1.6 × `10^{-19}` Kg
- (b) 1/16th the mass of an atom of carbon-12, 1amu = 9.1 × `10^{-31}` Kg
- (c) 1/12th the mass of an atom of carbon-12, 1amu = 1.66 × `10^{-27}`Kg
- (d) The mass of helium nucleus, 1amu = 3.2 × `10^{-27}` Kg

- (c) 1/12th the mass of an atom of carbon-12, 1amu = 1.66 × `10^{-27}`Kg

## Q2 Which of the following quantity is vector quantity?

- (a) Density
- (b) angular velocity
- (c) Energy
- (d) angular frequency

- (b) angular velocity

## Q3 Which of the following quantities remains constant in a projectile motion?

- (a) Speed of body
- (b) acceleration acting on the body
- (c) vertical component of velocity
- (d) linear momentum of body

- (b) acceleration acting on the body

## Q4 The working of rocket is based on the principle of

- (a) Newton's first law
- (b) inertia of rest
- (c) conservation of linear momentum
- (d) none of these

- (c) conservation of linear momentum

## Q5 The component of contact force in the direction parallel to the surface of contact of two bodies and perpendicular to the surface are called

- (a) normal reaction, frictional force
- (b) frictional force, normal reaction
- (c) centripetal force, centrifugal force
- (d) centrifugal force, centripetal force

- (b) frictional force, normal reaction

## Q6 A car accelerates on a horizontal road due to the force exerted by

- (a) the engine of the car
- (b) the driver of the car
- (c) the earth gravitational force
- (d) the friction between tyres and road

- (d) the friction between tyres and road

## Q7 A body of certain mass is lifted upwards from ground to a certain height, the work done by the gravitational force and applied force respectively are

- (a) positive, negative
- (b) negative, positive
- (c) positive, positive
- (d) negative, negative

- (b) negative, positive

## Q8 The value of coefficient of restitution e for elastic and perfectly inelastic collisions are respectively

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

- (d) 1,0

## Q9. The center of mass of two non identical particle system

- (a) always lies in between two particles and on the line joining them
- (b) always lies at the center of two particles
- (c) may lie outside the two particle system but on the line joining them
- (d) always lies nearer the lighter particle

- (a) always lies in between two particles and on the line joining them

## Q10 Angular momentum has the same unit as

- (a) Impulse × distance
- (b) Linear momentum × time
- (c) Work × frequency
- (d) Power × distance

- (a) Impulse × distance

## Q11 In the absence of external torque acting on a rotating body, which of the following quantities can change?

- (a) Angular momentum
- (b) Angular velocity but not moment of inertia
- (c) Moment of inertia but not angular velocity
- (d) Both angular velocity and moment of inertia

- (d) Both angular velocity and moment of inertia

## Q12 The Vander Wall’s equation for an ideal gas is given by (P + a/`V^{2}` )(V- b) = RT, where P = pressure, V = volume, T = temperature, R = universal gas constant, a and b are constants. The dimensions of a and b in this equation are

- (a) [a] = `L^{3}` [b], M`L^{5}` `T^{-2}`
- (b) [a] = `L^{3}` [b], M`L^{-3}` `T^{-2}`
- (c) [a] = M`L^{5}` `T^{-2}` [b] = `L^{3}`
- (d) [a] = M`L^{3}` `T^{-2}` [b] = `L^{5}`

- (b) [a] = M`L^{5}` `T^{-2}` [b] = `L^{3}`

## Q13 . A person starts his journey from his home at 9.00 a.m.to his office and came back to his home at 5.00 p.m. His office is 20 km from his home, then the displacement and distance covered in his complete journey are:

- (a) 20 km, 0 Km
- (b) 0 km, 20 Km
- (c) 40 km, 0 Km
- (d) 0 km, 40 Km

- (d) 0 km, 40 Km

## Q14 Which of the following statement for an object in uniform motion is not true?

- (a)The object must be moving in straight path along same direction

(b) The object covers equal displacements in equal intervals of time - (c) The velocity of object changes by equal amounts in equal intervals of time like free fall under gravity.
- (d) The acceleration of object must be zero

- (c) conservation of linear momentum

## Q15 When a car moving in a fixed direction accelerates

- (a) The frictional force acts on it in the direction opposite to the direction of motion
- (b) The frictional force acts on it in the same direction as direction of motion
- (c) Frictional force is not required. The engine of the car gives the force needed.
- d) No force is required due to inertia of motion. The car accelerates by itself

- (b) The frictional force acts on it in the same direction as direction of motion

## Q16 If a body is stationary then

- (a) there is no force acting on it
- (b) the forces acting on it are not in contact with it
- (c) the combination of forces acting on it balance out
- (d) the body is in vacuum

- (c) the combination of forces acting on it balance out

## Q17 The restoring force produced in a spring is a conservative force. It means

- (a) Work done by spring force depends only on the initial and final positions.
- (b) Work done by spring force depends on the path between initial and final positions.
- (c) Work done by spring force in a cyclic process is non zero.
- (d) This statement is false. Spring force is a non conservative force

- (b) Work done by spring force depends on the path between initial and final positions.

## Q8 A man pushes a wall normally and fails to displace it but himself gets displaced by 2 m away from wall against frictional force between his feet and ground. Work done by wall on him is:

- (a) zero
- (b) negative
- (c) positive
- (d) depends on the frictional force between the wall and hands of the

- (c) positive

## Q19. Four particles given below have same linear momentum, which has maximum kinetic energy?

- (a) proton
- (b) electron
- (c) deutron
- (d) alpha particle

- (b) electron

## Q20 In which of the following motions momentum changes but K.E. does not change?

- (a) A freely falling body
- (b) A body moving in uniform motion
- (c) A body vertically thrown upwards
- (d) A body moving in uniform circular motion

- (d) A body moving in uniform circular motion

## Q21 The casing of a rocket in flight burns up due to friction. At whose expense is the heat energy required for burning obtained?

- (a) The kinetic energy of rocket
- (b) Energy given by atmosphere
- (c) Energy given by burning fuel
- (d) The potential energy of the rocket

- (a) The kinetic energy of rocket

## Q22 When perfectly inelastic collision between two objects takes place, then during the collision

- (a) Linear momentum remains conserved.

(b) Kinetic energy remains conserved. - (c) Both kinetic energy and linear momentum remain conserved.
- (d) Neither kinetic energy nor linear momentum remains conserved.

- (a) Linear momentum remains conserved.

## Q23 The angular velocity of a planet revolving in an elliptical orbit around the sun increases, when it comes near the sun and vice-versa. This process better explained on the basis of law of conservation of:

- (a) Mass
- (b) Linear Momentum
- (c) Angular Momentum
- (d) Energy

- (c) Angular Momentum

## Q24 A cylinder rolls down an inclined plane without slipping as shown. The work done against friction during rolling motion is

- (a) always positive
- (b) always negative
- (c) zero
- (d) first positive and then negative

- (c) zero

## Q25 The temperatures of two bodies measured by a thermometer are t1 = 20`0^{C}` ± 0.5`0^{C}` and t2 = 50`0^{C}` ± 0.5`0^{C}`. The temperature difference t = t2 – t1 between them is given by

- (a) t = 30 `0^{C}` ± 0.5 `0^{C}`
- (b) t = 70 `0^{C}`± 0.5 `0^{C}`
- (c) t = 70`0^{C}`± 1.0`0^{C}`
- (d) t = 30`0^{C}`± 1.0`0^{C}`

- (d) t = 30oC ± 1.0oC

## Q26 In the experiment of finding the reaction time of Sunil, his friend releases a scale from rest in between the fingers of Sunil and notices the scale to fall by a distance of 20 cm before being held by Sunil. The reaction time of Sunil is (Use g = 10 ms-2 )

- a) 0.1s
- (b) 0.2s
- (c) 0.3s
- (d) 0.4s

- (b) 0.2s

## Q27 The angle made by vector 𝐴⃗⃗ = 2𝑖̂+ 𝑗̂ with x axis is

- (a) tanθ = 0.5
- (b) tanθ = 2
- (c) tanθ = √5
- (d) tanθ = √ 2/5

- (a) tanθ = 0.5

## Q28 At what angle to the horizontal should an object be projected so that the maximum height reached is equal to the horizontal range?

- (a) tan θ = 1/4
- (b) tan θ = 1/2
- (c) tan θ = 4
- (d) tan θ = 2

- (c) tan θ = 4

## Q29. A rocket with a lift – off mass 3.5×`10^{4}` kg is blasted upwards with an initial acceleration of 10 m`s^{-2}` . Then, the initial thurst of the blast

- (a) 3.5×`10^{5}` N
- (b) 7.0×`10^{5}` N
- (c) 14.0×`10^{5}` N
- (d)1.75×`10^{5}`N

- (b) 7.0×`10^{5}` N

## Q30 Determine the maximum acceleration of the train in which a box lying on its floor will remain stationary. Given that the coefficient of static friction between the box and train’s floor is 0.15. Take g = 10m`s^{-2}`

- (a) 0.5 m`s^{-2}`
- (b) 1.0 m`s^{-2}`
- (c) 2.5 m`s^{-2}`
- (d) 1.5 m`s^{-2}`

- (d) 1.5 m`s^{-2}`

## Q31 A police officer fires a bullet of mass 50.0 g with speed 200 m`s^{-1}` on soft plywood of some thickness. The bullet emerges with speed 100 m`s^{-1}` from other side. Using work energy theorem, find the work done by plywood in reducing the speed of bullet?

- (a) – 50 J
- (b) – 550 J
- (c) – 750 J
- (d) – 200 J

- (c) – 750 J

## Q32 A particle of mass M is moving in a horizontal circle of radius R with uniform speed v. When it moves from one point to a diametrically opposite point, it’s

- (a) K.E changes by `\frac{1}{2}mv^{2}`
- (b) linear momentum does not change
- (c) linear momentum changes by 2 M v
- (d) K.E changes by `mv^{2}`

- (c) linear momentum changes by 2 M v

## Q33 How much energy is released, when 1mg of uranium is completely destroyed in an atom bomb.

- (a) 7×`10^{10}` J
- (b) 8×`10^{10}` J
- (c) 9×`10^{10}` J
- (d) 5×`10^{10}` J

- (c) 9× `10^{10}` J

## Q34 A solid cylinder of moment of inertia 0.625 kg `m^{2}` rotates about its axis with angular speed 100 rad`s^{-1}`. What is the magnitude of angular momentum of the cylinder about its axis?

- (a) 62.5 kg`m^{2}s^{-1}`
- (b) 625×104 kg`m^{2}s^{-1}`
- (c) 6.25 kg`m^{2}s^{-1}`
- (d) 625×105kg`m^{2}s^{-1}`

- (a) 62.5 kg`m^{2}s^{-1}`

## Q35 The sun rotates around itself in 27 days, if it were to expand to twice its present diameter, what would be its new period of revolution?

- (a) 27 days
- (b) 54 days
- (c) 81 days
- (d) 108 days

- (d) 108 days

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