# 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) Ï€/64 (

*D*

^{4}+

*d*

^{4})

- (B) Ï€/32 (

*D*

^{4}-

*d*

^{4})

- (C) Ï€/32 (

*D*

^{4}+

*d*

^{4})

- (D) Ï€/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 ‘Î¸’ makes an angle ‘Î±’ with ‘*P’*, then tan Î± equals- (A) P sin Î¸/P -
Q cos Î¸

- (B) Q sin Î¸/P +
Q cos Î¸

- (C) P sin Î¸/P +
Q tan Î¸

- (D) Q sin Î¸/P +
Q sin Î¸

**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 (Î±) 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 Î±*

- (B) ½

*sin Î±*

- (C) ½

*tan Î±*

- (D) 2

*cos Î±*

**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

**View All Answers**

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