Motion in a Straight Line Test

Result

Motion in a Straight Line Test - 41

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Question 1
4 / -1

A very large number of balls are thrown vertically upwards in quick succession in such a way that the next ball is thrown when the previous one is at the maximum height. If the maximum height is 5m, the number of ball thrown per minute is (take g = 10 m/s²)

A
120

B
80

C
60

D
40

Solution
Question 2
4 / -1

A body falls from rest in the gravitational field of the earth. The distance travelled in the fifth second of its motion is (g = 10 m/s²)

A
25 m

B
45 m

C
90 m

D
125 m

Solution
Question 3
4 / -1

A balloon is rising vertically up with a velocity of 29 ms^–1. A stone is dropped from it and it reaches the ground in 10 sec. The height of the balloon when the stone was dropped from it is (g = 9.8 m/s²)

A
100 m

B
200 m

C
400 m

D
150 m

Solution
Question 4
4 / -1

A ball is released from the top of a tower of height h meters. It takes T sec to reach the ground. What is the position of the ball in T/3 sec?

A
h/9 m from he ground

B
7h/9 m from the ground

C
8h/9 from the ground

D
17h/18 m from the ground

Solution
Question 5
4 / -1

Two balls of same size but the density of one is greater than that of other are dropped from the same height, then which ball will reach the earth first (air resistance is negligible)

A
Heavy ball

B
Light ball

C
Both simultaneously

D
Will depend upon the density of the balls
Question 6
4 / -1

A body is thrown vertically upwards with velocity u. The distance travelled by it in the fifth and the sixth sec are equal. The velocity u is given by (g = 9.8 m/s²)

A
24.5 m/s

B
49.0 m/s

C
73.5 m/s

D
98.0 m/s

Solution
Question 7
4 / -1

A body, thrown upwards with some velocity reaches the maximum height of 50 m. Another body with double the ass thrown up with double the initial velocity will reach a maximum height of

A
100 m

B
200 m

C
300 m

D
400 m

Solution
Question 8
4 / -1

A stone falls freely from rest and the total distance covered by it in the last second of its motion equals the distance covered by it in the first three sec of its motion. The stone remains in the air for

A
6 s

B
5 s

C
7 s

D
4 s

Solution
Question 9
4 / -1

Two identical metal spheres are released from the top of a tower after t sec of each other such that they fall along the same vertical line. If air resistance is neglected, then at any instant of time during their fall

A
The difference in their displacements remain the same

B
The difference between their speed remains the same

C
The difference between their heights above ground is proportional to t²

D
The difference between their displacements is proportional to t
Question 10
4 / -1

Free fall of an object (in vacuum) is a case of motion with

A
Uniform velocity

B
Uniform acceleration

C
Variable acceleration

D
Constant momentum