Motion in a Straight Line Test

Result

Motion in a Straight Line Test - 33

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following four statements is false?

A
A body can have zero velocity and still be accelerated

B
A body can have a constant velocity and still have a varying speed

C
A body can have a constant speed and still have a varying velocity

D
The direction of the velocity of a body can change when its acceleration i s constant
Question 2
4 / -1

A particle moving with a uniform acceleration travels 24 m and 64 m in the first two consecutive intervals of 4 sec each. Its initial velocity

A
1 m/sec

B
10 m/sec

C
5 m/sec

D
2 m/sec

Solution
Question 3
4 / -1

Two cars A and B are travelling in the same direction with velocities v₁ and v₂(v₁ > v₂). When the car A is at a distance d ahead of the car B, the driver of the car A applied the brake producing a uniform retardation a. There will be no collision when

A

B

C

D

Solution
Question 4
4 / -1

A body of mass 10 kg is moving with a constant velocity of 10 m/s. When a constant force acts for 4 sec on it, it moves with a velocity 2 m/sec in the opposite direction. The acceleration produced in it is

A
3 m/sec²

B
–3 m/sec²

C
0.3 m/sec²

D
–0.3 m/sec²

Solution
Question 5
4 / -1

A

B

C

D

Solution
Question 6
4 / -1

An elevator car, whose floor to ceiling distance is equal to 2.7 m, starts ascending with constant acceleration of 1.2 ms^–2, 2 sec after the start, a bolt begins falling from the ceiling of the car. The free fall time of the bolt is

A
√0.54 s

B
√6 s

C
0.7 s

D
1 s

Solution
Question 7
4 / -1

Speed of two identical cars are u and 4u at a specific instant. The ratio of the respective distances in which the two cars are stopped from that instant is

A
1 : 1

B
1 : 4

C
1 : 8

D
1 : 16

Solution
Question 8
4 / -1

Two trains travelling on the same track are approaching each other with equal speeds of 40 m/s. The drivers of the trains begin to decelerate simultaneously when they are just 2.0 km apart. Assuming the decelerations to be uniform and equal, the value of the deceleration to barely avoid collision should be

A
11.8 m/s²

B
11.0 m/s²

C
2.1 m/s²

D
–0.8 m/s²

Solution
Question 9
4 / -1

A body moves from rest with a constant acceleration of 5 m/s².Its instantaneous speed (in m/s) at the end of 10 sec is

A
50

B
5

C
2

D
0.5

Solution
Question 10
4 / -1

A boggy of uniformly moving train is suddenly detached from train and stops after covering some distance. The distance covered by the boggy and distance covered by the train in the same time has relation

A
Both will be equal

B
First will be half of second

C
First will be 1/4 of second

D
No definite ratio

Solution