# Practice Test: Question Set - 16

**1. What is the answer to this question?**

- (A) Zero

- (B) 2

*t*

- (C) 3

*t*

- (D) 1

*t*

**2. A Second's pendulum gains 2 minutes a day. To make it to keep correct time its length**

- (A) Must
be decreased

- (B) Must
be increased

- (C) Is
not changed but weight of the bob is increased

- (D) Is
not changed but weight of the bob is decreased

**3. In a simple harmonic motion, the position of equilibrium is always**

- (A) Stable

- (B) Unstable

- (C) Neutral

- (D) None of the above

**4. The centre of gravity of a quadrant of a circle lies along its central radius at a distance of**

- (A) 0.2

*R*

- (B) 0.4

*R*

- (C) 0.3

*R*

- (D) 0.6

*R*

**5. Lami's theorem states that**

- (A) Three forces
acting at a point are always in equilibrium

- (B) If three
forces acting on a point can be represented in magnitude and direction by the
sides of a triangle, the point will be in the state of equilibrium

- (C) Three
coplanar forces acting at a point will be in equilibrium, if each force is
proportional to the sine of the angle between the other two

- (D) Three
coplanar forces acting at a point will be in equilibrium if each force is
inversely proportional to the sine of the angle between the other two

**6. Impulse can be obtained from a**

- (A) Force-displacement diagram

- (B) Force-time diagram

- (C) Velocity-time diagram

- (D) Velocity-displacement diagram

**7. A block of weight 50 kg is placed on a horizontal plane. When a horizontal force of 18 kg is applied, the block is just on the point of motion. The angle of friction is**

- (A) 17° 48'

- (B) 18° 48'

- (C) 19° 48'

- (D) 20° 48'

**8. The units of moment of inertia of an area are**

- (A)

*kg*/

*m*

- (B)

*kg*/

*m*

^{2}- (C)

*m*

^{4}- (D)

*m*

^{3}**9. A car goes round a curve of radius 100 m at 25 m/sec. The angle to the horizontal at which the road must be banked to prevent sideways friction on the car wheels is tan"1 x, where x is (Assume g = 10 m/sec²)**

- (A) 3/8

- (B) 1/2

- (C) 9/5

- (D) 5/8

**10. From the circular plate of a diameter 6 cm is cut out a circular plate whose diameter is equal to radius of the plate. The C.G. of the remainder shifts from the original position through**

- (A) 0.25 cm

- (B) 0.50
cm

- (C) 0.75 cm

- (D) 1.00 cm

**11. The resultant of two forces acting at right angles is 5 kgf and if they act at an angle of 60°, it is 37 kgf. The magnitudes of the forces are:**

- (A) 2 kgf, 3 kgf

- (B) 3
kgf, 4 kgf

- (C) 4 kgf, 5 kgf

- (D) 5 kgf, 3 kgf

**12. The diagram showing the point of application and line of action of forces in their plane is called**

- (A) Vector diagram

- (B) Space diagram

- (C) Force diagram

- (D) Funicular diagram

**13. Energy may be defined as**

- (A) Power
of doing work

- (B) Capacity of
doing work

- (C) Rate
of doing work

- (D) All the
above

**14. If two forces of 3 kg and 4 kg act at right angles to each other, their resultant force will be equal to**

- (A) 7 kg

- (B) 1 kg

- (C) 5 kg

- (D) None of
these

**15. A block in the shape of a parallelepiped of sides 1m × 2m × 3m lies on the surface. Which of the faces gives maximum stable block?**

- (A) 1 m × 2 m

- (B) 2 m × 3 m

- (C) 1 m × 3 m

- (D) Equally stable on all faces

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