Laws of Motion Test

Result

Laws of Motion Test - 51

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Weekly Quiz Competition

Question 1
4 / -1

A ball of mass 400 g is dropped from a height of 5 m. A boy on the ground hits the ball vertically upwards with a bat with an average force of 100 N so that it attains a vertical height of 20 m. The time for which the ball remains in contact with the bat is [g = 10 m/s²]

A
0.12 s

B
0.08 s

C
0.04 s

D
12 s

Solution
Question 2
4 / -1

The linear momentum p of a body moving in one dimension varies with time according to the equation p = a + bt², where a and b are positive constants. Thenet force acting on the body is

A
A constant

B
Proportional to t²

C
Inversely proportional to t

D
Proportional to t

Solution
Question 3
4 / -1

A body is imparted motion from rest to move in a straight line. If it is then obstructed by an opposite force, then

A
The body may necessarily change direction

B
The body is sure to slow down

C
The body will necessarily continue to move in the same direction at the same speed

D
None of the above
Question 4
4 / -1

The adjacent figure is the part of a horizontally stretched net. Section AB is stretched with a force of 10 N. The tensions in the sections BC and BF are

A
10 N, 11 N

B
10 N, 6 N

C
10 N, 10 N

D
Cannot calculate due to insufficient data

Solution
Question 5
4 / -1

A second pendulum is mounted in a rocket. Its period of oscillation decreases when the rocket

A
Comes down with uniform acceleration

B
Moves round the earth in a geostationary orbit

C
Moves up with a uniform velocity

D
Moves up with uniform acceleration

Solution
Question 6
4 / -1

A particle moves in the xy–plane under the action of a force Fsuch that the components of its linear momentum p at any time t are p_x = 2 cost, p_y = 2 sin t. The angle between F and p attime t is

A
90°

B
0°

C
180°

D
30°

Solution
Question 7
4 / -1

A cricket ball of mass 250 g collides with a bat with velocity 10 m/s and returns with the same velocity within 0.01 s. The force acted on bat is

A
25 N

B
50 N

C
250 N

D
500 N

Solution
Question 8
4 / -1

A pendulum bob of mass 50 g is suspended from the ceiling of an elevator. The tension in the string if the elevator goes up with uniform velocity is approximately

A
0.30 N

B
0.40 N

C
0.42 N

D
0.50 N

Solution
Question 9
4 / -1

A ball of mass 0.5 kg moving with a velocity of 2 m/s strikes a wall normally and bounces back with the same speed. If the time of contact between the ball and the wall is 1 ms, the average force exerted by the wall on the ball is

A
2000 N

B
1000 N

C
5000 N

D
125 N

Solution
Question 10
4 / -1

An automobile travelling with a speed of 60 km/h, can brake to stop within a distance of 20 m. If the car is going twice as fast, i. e., 120 km/hr, the stoppingdistance will be

A
20 m

B
40 m

C
60 m

D
80 m

Solution