Laws of Motion Test

Result

Laws of Motion Test - 24

Score
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Weekly Quiz Competition

Question 1
4 / -1

A body of mass 4 kg moving on a horizontal surface with an initial velocity of 6 ms^-1 comes to rest after 3 seconds. If one wants to keep the body moving on the same surface with the velocity of 6 ms^-1, the force required is

A
Zero

B
4 N

C
8 N

D
16 N

Solution
Question 2
4 / -1

A plumb line is suspended from the roof of a carriage moving with an acceleration a. If plumb line gets inclined at an angle θ with vertical, then

A
a = g tanθ

B
a = dv/dt

C
a = d²x / dt²

D
a = f/m

Solution
Question 3
4 / -1

A particle of mass m strikes a wall at an angle of incidence 60^o with velocity v elastically. The change in momentum is

A
mv

B
mv / 2

C
–2mv

D
zero
Question 4
4 / -1

A man slides down a light rope whose breaking strength is η times his weight. What should be his maximum acceleration so that the rope just not breaks ?

A

B

C

D
Question 5
4 / -1

A ‘NO VACANCY’ board of mass 5 kg is suspended from a horizontal beam by two supporting wires, each at an angle of 45⁰ to the vertical. The tension of each wire is (g = 10 ms^-2)

A
50 N

B
35 N

C
12.5 N

D
20 N
Question 6
4 / -1

A
p

B

C

D
zero

Solution
Question 7
4 / -1

A

B

C

D

Solution
Question 8
4 / -1

A spring is compressed between two toy carts of masses m₁ and m₂. When the toy carts are released, then spring exerts on each, equal and opposite average force for the same time t. Assume that there is no friction between the toy carts and the ground, then the speeds of toy carts are:

A
in opposite directions but in inverse ratio of masses

B
in the opposite directions but in the direct ratio of masses

C
equal but in opposite direction

D
equal but in same direction
Question 9
4 / -1

A sand bag of mass M is suspended by a rope. A bullet of mass m is fired at it with speed v and gets embeded in it. The loss of K.E. is

A

B

C

D

Solution
Question 10
4 / -1

A bullet is fired by a light rifle and the other with a heavy rifle by the same force. Which rifle will cause more injury to the shoulder

A
Light rifle

B
Heavy rifle

C
Both will cause the same injury

D
The information is insufficient