Laws of Motion Test

Result

Laws of Motion Test - 16

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Question 1
4 / -1

A steel wire can withstand a load upto 2940 N. A load of 150 kg is suspended from a rigid support. The maximum angle through which the wire can be displaced from the mean position, so that the wire does not break when the load passes through the position of equilibrium, is

A
30°

B
60°

C
80°

D
85°

Solution
Question 2
4 / -1

If a street light of mass M is suspended from the end of a uniform rod of length L in different possible patterns as shown in figure, then

A
pattern A is more sturdy

B
pattern B is more sturdy

C
pattern C is more sturdy

D
All will have same sturdiness

Solution
Question 3
4 / -1

The adjacent figure is the part of a horizontally stretched net. Section AB is stretched with a force of 10 N. The tensions in the sections BC and BF are

A
10 N, 11 N

B
10 N, 6 N

C
10 N, 10 N

D
Can't be calculated due to insufficient data

Solution
Question 4
4 / -1

Two particles of equal mass are connected to a rope AB of negligible mass, such that one is at end A and the other dividing the length of the rope in the ratio 1 : 2 from B. The rope is rotated about end B in a horizontal plane. Ratio of the tensions in the smaller part to the other is (ignore effect of gravity)

A
4 : 3

B
1 : 4

C
1 : 2

D
1 : 3

Solution
Question 5
4 / -1

A mass M kg is suspended by a weightless string. The horizontal force required to hold the mass at 60° with the vertical is

A
Mg

B

C

D

Solution
Question 6
4 / -1

A block of mass 0.18 kg is attached to a spring of force constant 2N/ m . The coefficient of friction between the block and the floor is 0.1. Initially the block is at rest and the spring is unstretched. An impulse is given to the block. The block slides a distance of 0.06 m and comes to rest for the first time the initial velocity of the block in m/s is v= N / 10. Then, N is

A
2

B
3

C
4

D
6

Solution
Question 7
4 / -1

An object is gently placed on a long converges belt moving with 11 ms^-1.If the coefficient of friction is 0.4, then the block will slide in the belt upto a distance of

A
10.21 m

B
15.125 m

C
20.3 m

D
25.6 m

Solution
Question 8
4 / -1

Three blocks of masses m₁ , m₂ and m₃ are connected by massless string as shown kept on a frictionless table.
They are pulled with a force T₃ = 40 N. If m₁ = 10 kg, m₂ = 6 kg and m₃ = 4 kg , the tension T₂ will be

A
20 N

B
40 N

C
10 N

D
32 N

Solution
Question 9
4 / -1

A box of mass 2 kg is placed on the roof of a car. The box would remain stationary until the car attains a maximum acceleration. Coefficient of static friction between the box and the roof of the car is 0.2 and g =10 ms^-2. The maximum acceleration of the car, for the box to remain stationary, is

A
8 ms^-2

B
6 ms^-2

C
4 ms^-2

D
2 ms^-2

Solution
Question 10
4 / -1

Three blocks of masses 4 kg, 2 kg and 1 kg respectively are in contact on a frictionless table as shown in the figure. If a force of 14 N is applied on the 4 kg block, the contact force between the 4 kg and the 2 kg block will be

A
2 N

B
6 N

C
8 N

D
14 N

Solution