CSIT Family An online CSIT community

### Mechanics

51. The rate of tension and surface tension has dimension of 

[M0L0t0]

[L]

[L-1]

[LT-1]

52. A force of 5N acts on a body of weight 10N the acceleration of body is 

50 m/s2

2 m/s2

5 m/s2

0.5 m/s2

53.The depth from surface of earth at which value of acceleration due to gravity become half of on the surface of earth is 

$R$

$\sqrt{2}R$

$\frac{R}{2}$

$\frac{R}{4}$

54. Spokes in a bicycle wheel is used to

Increase mass

Give better mass

Increase moment inertia

Drive Easily

55. If length of wire is doubled keeping the diameter constant, it’s Young's modulus will 

increases

decrease

remains same

depend upon nature of matter

56.A rain drop of radius 0.3mm has terminal velocity Im/s in air.The viscosity of air is 18 x 10-5 poise, then viscous force is 

1.01 x 10-7N

1.01 x 10-8N

1.6 x 10-9N

1.6 x 10 -8

52. A projectile goes farthest away from Earth, when the angle of projection is 

45°

90°

120°

53. A simple pendulum where set into vibration comes to neat after sometimes because of 

friction of air

gravity

mass

54. Powder cling to skin because of 

compression

cohesion

capillarity

55. Viscosity is inherent property of liquid and gases and is more closely related to 

inertia

shearing sharing

transfer of momentum

surface tension

53. A man walks 8 m forwards East and 6m towards North. The magnitude of displacement is 

14m

2m

8m

(82 + 62)m

54. If initial velocity of a projectile is doubled, the maximum range will by 

2 times

4 times

8 times

16 times

55. Which of the following friction is maximum?

rolling

Kinetic

rolling + kinetic

static

56. If the speed of rotation of earth increases, the weight of the body earth’s surface becomes 

smaller

zero

greater

unaffected

57. A weightless rubber balloon has 100g of water in it. Its weight in water will be

100g

50g

> 100g

zero

51. A force F = $\stackrel{\to }{\mathrm{2i}}+\stackrel{\to }{\mathrm{3j}}-\stackrel{\to }{\mathrm{4k}}$ newton acts on a body. In 5 seconds the force displaces the body through a displacement S = $\stackrel{\to }{\mathrm{3i}}+\stackrel{\to }{j}-\stackrel{\to }{\mathrm{2k}}$ meter. The power (in watt) of the force is 

4.3

3.4

5.4

6.3

52. Two simple harmonic waves are represented respectively by y1 = A1 sin ωt and y2 = A2 cos ωt. The phase difference between the two wave is 

3π / 2

π

π/2

π/4

53. A river is flowing west to east at a speed of 5 m/min. A man on the south bank of the river, capable of swimming at 10m/min in still water, wants to swim across the river by the shortest path. He should swim in the direction 

due north

30° East of North

60° East of North

30° West of North

54. Dimension of surface energy is 

[M1L0T-2]

[M1L1t-1]

[M0L1T-2]

[M2L0T-2]

55. The terminal velocity of a small sized spherical body of radius r falling vertically in a viscous liquid is given as one of the following proportionality with radius. 

r-2

r-1

r

r2

56. A constant torque acting on a uniform circular wheel changes its angular momentum from L0 to 4L0 in 4 second. The magnitude of this torque is 

(3/4)Lo

Lo

4o

12Lo

51. The dimension of (h/e) are same as that of 

Magnetic field

Electric field

Magnetic flux

Electric flux

52. The number of significant figure in 0.0030 x 1011m are 

5

4

11

2

53. μk and μk are coefficent of static and kinetic friction between two bodies. Then 

μs ≥ μk

μs < μk

μs = 0 and μk > 0

μk < 0 and μk <0

54. When a torque acts on a body, the change in the angular momentum of the body is 

Perpendicular to $\stackrel{\to }{L}$

Perpendicular to $\stackrel{\to }{L}$

Always zero

180° $\stackrel{\to }{L}$

55. The Poisson's ratio of material can't be 

0.10

0.20

0.40

0.65

56. The depth of water at which air bubble of radius 0.4mm may remain in equilibrium (surface tension of water = 72 x 10-3 N/m, g = 9.8 m/s2 is given by

7.348 cm

0.918 cm

3.674 cm

1.837 cm I there is