Laws of Motion Test

Result

Laws of Motion Test - 25

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Weekly Quiz Competition

Question 1
4 / -1

If E, G and N represent the magnitudes of electromagnetic, gravitational and nuclear forces between two protons at a given separation, then,

A
N = E = G

B
E < N < G

C
N > G < E

D
E > G > N
Question 2
4 / -1

In a tug of war, two opposite teams are pulling the rope with an equal and opposite force of 10 KN at each and of the rope, so that condition of equilibrium exists. What is the tension in the rope ?

A
Zero

B
5 KN

C
10 KN

D
20 KN
Question 3
4 / -1

A container, filled with water and having a wooden block floating in it, is allowed to fall freely under gravity. During the fall, the upthrust on the wooden block will be

A
equal to the weight of block in air

B
equal to weight of water displaced by the portion of the block

C
equal to loss of weight of the block in water

D
Zero
Question 4
4 / -1

Two bodies of 5 kg and 4 Kg are tied to a string as shown in Fig. If the table and pulley both are smooth, then acceleration of 5 kg mass will be

A
49 m/s²

B
5.45 m/s²

C
19.5 m/s²

D
2.72 m/s²

Solution
Question 5
4 / -1

Two masses A and B each of mass M are fixed together by a massless spring. A force acts on the mass B as shown in Fig. At the instant shown, the mass A has acceleration ‘a’. What is the acceleration of mass B ?

A
(F / M ) ‒ a

B
a

C
‒ a

D
(F/ M)
Question 6
4 / -1

Consider the situation shown in figure the acceleration of block of mass m is

A
g/3 up the plane

B
g/3 down the plane

C
g/2 up the plane

D
g/2 down the plane

Solution
Question 7
4 / -1

Two blocks each having a mass M, rest on frictionless surfaces as shown in Fig. If the pulleys are light and frictionless, and M on the incline is allowed to move down, then the tension in the string will be

A

B

C

D
Question 8
4 / -1

Two blocks are connected over a massless pulley as shown in fig. the mass of block A is 10 kg and the coefficient of kinetic friction is 0.2. Block A slides down the incline at constant speed. The mass of block B in kg is

A
3.5

B
> 2.5

C
3.3

D
3.0
Question 9
4 / -1

A body of mass 60 kg is dragged with just enough force to start moving on a rough surface with coefficients of static and kinetic frictions 0.5 and 0.4 respectively. On applying the same force, what is the acceleration ?

A
0.98 m/s²

B
9.8 m/s²

C
0.54 m/s²

D
5.292 m/s²
Question 10
4 / -1

For the arrangement shown in Fig., the tension in the string to prevent it from sliding down is

A
6 N

B
6.4 N

C
0.4 N

D
zero