Laws of Motion Test

Result

Laws of Motion Test - 52

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Question 1
4 / -1

A ball of mass m moves with speed v and it strikes normally with a wall and reflected back normally, if its time of contact with wall is t, then find force exerted byball on wall

A

B

C

D

Solution
Question 2
4 / -1

A plumb line is suspended from a ceiling of a car moving with horizontal acceleration of a. What will be the angle of inclination with vertical?

A
tan^–1(a/g)

B
tan^–1(g/a)

C
cos^–1(a/g)

D
cos^–1(g/a)

Solution
Question 3
4 / -1

A force of 10 N acts on a body of mass 20 kg for 10 s.Change in its momentum is

A
5 kg m/s

B
100 kg m/s

C
200 kg m/s

D
1000 kg m/s

Solution
Question 4
4 / -1

A body of mass 1.0 kg is falling with an acceleration of 10 m/s². Its apparent weight will be (g = 10 m/s²)

A
1.0 kg

B
2.0 kg

C
0.5 kg

D
Zero

Solution
Question 5
4 / -1

A lift accelerated downward with acceleration \'a\'. A man in the lift throws a ball upward with acceleration a₀(a₀< a). Then, acceleration of ball observed byobserver, which is on Earth, is

A
(a + a₀) upward

B
(a –a₀) upward

C
(a + a₀) downward

D
(a –a₀) downward

Solution
Question 6
4 / -1

A lift is moving down with acceleration a. A man in the lift drops a ball inside the lift. The acceleration of the ball as observed by the man in the lift and a man standing stationary on the ground are respectively

A
g, g

B
g – a, g – a

C
g – a, g

D
a, g
Question 7
4 / -1

If in a stationary lift, a man is standing with a bucket full of water, having a hole at its bottom. The rate of flow of water through this hole is R₀. If the lift starts to move up and down with same acceleration and then that rates of flow of water are R_u and R_d, then

A
R₀ > R_u >R_d

B
R_u > R₀ >R_d

C
R_d> R₀ > R_u

D
R_u >R_d > R₀

Solution
Question 8
4 / -1

A gun fires N bullets per second, each of mass m with velocity v. The force exerted by the bullets on the gun is

A

B

C

D
Question 9
4 / -1

A man is standing at the centre of frictionless pond of ice. How can he get himself to the shore?

A
By throwing his shift in vertically upward direction

B
By spitting horizontally

C
He will wait for the ice to melt in pond

D
Unable to get at the shore
Question 10
4 / -1

A student attempts to pull himself up by tugging on hishair. He will not succeed

A
As the force exerted is small

B
The frictional force while gripping, is small

C
Newton's law of inertia is not applicable to living beings

D
As the force applied is internal to the system