bcafamilyMechanics
51. The rate of tension and surface tension has dimension of [2075]
[M0L0t0]
[L]
[L-1]
[LT-1]
52. A force of 5N acts on a body of weight 10N the acceleration of body is [2075]
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 [2075]
54. Spokes in a bicycle wheel is used to[2075]
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 [2075]
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 [2075]
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 [2074]
0°
45°
90°
120°
53. A simple pendulum where set into vibration comes to neat after sometimes because of [2074]
friction of air
tension on thread
gravity
mass
54. Powder cling to skin because of [2074]
compression
cohesion
adhesion
capillarity
55. Viscosity is inherent property of liquid and gases and is more closely related to [2074]
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 [2073]
14m
2m
8m
(82 + 62)m
54. If initial velocity of a projectile is doubled, the maximum range will by [2073]
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 [2073]
smaller
zero
greater
unaffected
57. A weightless rubber balloon has 100g of water in it. Its weight in water will be[2073]
100g
50g
> 100g
zero
51. A force F = newton acts on a body. In 5 seconds the force displaces the body through a displacement S = meter. The power (in watt) of the force is [2072]
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 [2072]
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 [2072]
due north
30° East of North
60° East of North
30° West of North
54. Dimension of surface energy is [2072]
[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. [2072]
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 [2072]
(3/4)Lo
Lo
4o
12Lo
51. The dimension of (h/e) are same as that of [2071]
Magnetic field
Electric field
Magnetic flux
Electric flux
52. The number of significant figure in 0.0030 x 1011m are [2071]
5
4
11
2
53. μk and μk are coefficent of static and kinetic friction between two bodies. Then [2071]
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 [2071]
Perpendicular to
Perpendicular to
Always zero
180°
55. The Poisson's ratio of material can't be [2071]
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[2071]
7.348 cm
0.918 cm
3.674 cm
1.837 cm
