Physics Test

Result

Physics Test - 20

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Question 1
3 / -1

A stone is dropped from a certain height. After falling for 5 sec, the stone breaks through a pane of glass and instantaneously, loses half of its velocity. If the stone takes one more second to reach the ground, what is the height of the glass above the ground? (Given g = 10 m/s²)

A
60 m

B
50 m

C
30 m

D
20 m

Solution
Question 2
3 / -1

Water is falling on the blades of a turbine at the rate of 6000 kg/min. The height of the fall is 100 m. The power given to the turbine is (Take g = 10 m/s²)

A
10 kW

B
6 kW

C
100 kW

D
150 kW

Solution
Question 3
3 / -1

Three particles, each of mass 'm' g, are situated at the vertices of an equilateral triangle ABC of side l cm (as shown in the figure). The moment of inertia of the system about a line AX perpendicular to AB in the plane of ABC in gram-cm² unit will be

A
(3/4) ml²

B
2 ml²

C
(5/4) ml²

D
(3/2) ml²

Solution
Question 4
3 / -1

If two balls each of mass 0.06 kg moving in opposite directions with speed of 4 ms^-1 collide and rebound with same speed, then the impulse imparted to each ball due to other is

A
0.48 kg ms^-1

B
0.53 kg ms^-1

C
0.81 kg ms^-1

D
0.92 kg ms^-1

Solution

Impulse = (0.06 x 4 + 0.06 x 4) x 1 = 0.48 kg m/s
Question 5
3 / -1

Which of the following magnitudes is expressed most accurately?

A
1.3 x 10^-1 m

B
1.30 x 10^-2 m

C
1.3000 x 10^-4 m

D
1.3000 x 10^-6m

Solution

The result is expressed in maximum number of significant figures in the 4th option, so this option is the answer.
Question 6
3 / -1

A body constrained to move in y-direction is subjected to a force N. The work done by this force in moving the body through a distance of 10 m along the y-axis is

A
100 J

B
150 J

C
120 J

D
200 J

Solution
Question 7
3 / -1

A 1 kg ball moving at 12 m/s collides head-on with a 2 kg ball moving in the opposite direction at 24 m/s. What is the velocity of each ball after the impact, if the coefficient of restitution is 2/3 ?

A
v₁ = -28 m/s, v₂ = -4 m/s

B
v₁ = 20 m/s, v₂= 2 m/s

C
v₁ = -30 m/s, v₂= -18 m/s

D
v₁ = -20 m/s, v₂= -4 m/s

Solution
Question 8
3 / -1

A small drop of water of surface tension is squeezed between two clean glass plates, so that a thin layer of thickness d and area A is formed between them. If the angle of contact is zero, then the force required to pull the plates apart is

A

B

C

D

Solution
Question 9
3 / -1

The Leaning Tower of Pisa does not fall because

A
it is tapered at the top.

B
it covers a large base area.

C
the vertical line passing through the centre of gravity of the tower falls within its base.

D
its centre of gravity remains at the lowest position.

Solution

The Leaning Tower of Pisa does not fall because the vertical line through the centre of gravity of the tower falls within its base.
Question 10
3 / -1

A stone weighing 0.5 Kg tied to a rope of length 0.5 m revolves along a circular path in a vertical plane. The tension of the rope at the bottom point of the circle is 45 N. To what height will the stone rise if the rope breaks the moment the velocity is directed upwards? (g = 10m/s²)

A
2 m

B
4 m

C
6 m

D
8 m

Solution