# Practice Test: Question Set - 23

**1. M.I. of a thin ring (external diameter**

*D*, internal diameter*d*) about an axis perpendicular to the plane of the ring, is- (A) π/64 (

*D*

^{4}+

*d*

^{4})

- (B) π/32 (

*D*

^{4}-

*d*

^{4})

- (C) π/32 (

*D*

^{4}+

*d*

^{4})

- (D) π/32 (

*D*

^{4}×

*d*

^{4})

**2. A rigid body suspended vertically at a point and oscillating with a small amplitude under the action of the force of gravity, is called**

- (A) Simple
pendulum

- (B) Compound
pendulum

- (C) Second's
pendulum

- (D) None of
these

**3. The maximum frictional force which comes into play, when a body just begins to slide over the surface of a another body, is known**

- (A) Sliding
friction

- (B) Rolling
friction

- (C) Limiting
friction

- (D) None of
these

**4. If the resultant of two forces ‘**

*P’*and ‘*Q’*acting at an angle ‘θ’ makes an angle ‘α’ with ‘*P’*, then tan α equals- (A) P sin θ/P -
Q cos θ

- (B) Q sin θ/P +
Q cos θ

- (C) P sin θ/P +
Q tan θ

- (D) Q sin θ/P +
Q sin θ

**5. For maximum range of a projectile, the angle of projection should be**

- (A) 30°

- (B) 45°

- (C) 60°

- (D) None of
these

**6. The angle of projection for a range is equal to the distance through which the particle would have fallen in order to acquire a velocity equal to the velocity of projection, will be**

- (A) 30°

- (B) 45°

- (C) 60°

- (D) 75°

**7. One half of a vibration of a body, is called**

- (A) Period time

- (B) Oscillation

- (C) Beat

- (D) Amplitude

**8. Time required to stop a car moving with a velocity 20 m/sec within a distance of 40 m, is**

- (A) 2 sec

- (B) 3 sec

- (C) 4 sec

- (D) 5 sec

**9. A ball of mass 1 kg moving with a velocity of 2 m/sec collides a stationary ball of mass 2 kg and comes to rest after impact. The velocity of the second ball after impact will be**

- (A) Zero

- (B) 0.5 m/sec

- (C) 1.0 m/sec

- (D) 2.0 m/sec

**10. The centre of gravity of a plane lamina will not be at its geometrical centre if it is a**

- (A) Circle

- (B) Equilateral
triangle

- (C) Rectangle

- (D) Right angled
triangle

**11. If the angle between the applied force and the direction of motion of a body, is between 90° and 180°, the work done, is called**

- (A) Virtual work

- (B) Imaginary
work

- (C) Zero work

- (D) Negative
work

**12. If the angle of projection is double the angle of inclination (α) of the plane on which particle is projected, the ratio of times of flight up the inclined plane and down the inclined plane, will be**

- (A) ½

*cos α*

- (B) ½

*sin α*

- (C) ½

*tan α*

- (D) 2

*cos α*

**13. In simple harmonic motion, acceleration of a particle is proportional to**

- (A) Rate
of change of velocity

- (B) Displacement

- (C) Velocity

- (D) Direction

**14. When a body falls freely under gravitational force, it possesses**

- (A) Maximum
weight

- (B) Minimum
weight

- (C) No weight

- (D) No effect on
its weight

**15. In a simple screw jack, the pitch of the screw is 9 mm and length of the handle operating the screw is 45 cm. The velocity ratio of the system is**

- (A) 1.5

- (B) 5

- (C) 25

- (D) 314

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