Laws of Motion Test

Result

Laws of Motion Test - 78

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Weekly Quiz Competition

Question 1
4 / -1

Three weights W, 2W and 3W are connected to identical springs suspended from a rigid horizontal rod. The assembly of the rod and the weights fall freely. The positions of the weights from the rod are such that

A
3W will be farthest

B
W will be farthest

C
All will be at the same distance

D
2W will be farthest
Question 2
4 / -1

A false balance has equal arms. An object weigh X when placed in one pan and Y when placed in other pan, then the weight W of the object is equal to

A

B

C

D
Question 3
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 sturdier

B
Pattern B is sturdier

C
Pattern C is sturdier

D
All will have same sturdiness
Question 4
4 / -1

In the arrangement shown in figure the ends P and Q of an unstrechable string move downwards with uniform speed U. Pulleys A and B are fixed. Mass M moves upwards with a speed

A

B

C

D
Question 5
4 / -1

A pulley fixed to the ceiling carries a string with blocks of mass m and 3m attached to its ends. The masses of string and pulley are negligible. When the system is released, its centre of mass moves with what acceleration

A
0

B
g/4

C
g/2

D
–g/2
Question 6
4 / -1

A

B
29 N

C
26 N

D
Question 7
4 / -1

A stick of 1 m is moving with velocity of 2.7 × 10⁸ ms^–1. What is the apparent length of the stick? (c = 3 × 10⁸ ms^–1)

A
10 m

B
0.22 m

C
0.44 m

D
2.4 m
Question 8
4 / -1

One day on a spacecraft corresponds to 2 days on the earth. The speed of the spacecraft relative to the earth is

A
1.5 × 10⁸ ms^–1

B
2.1 × 10⁸ ms^–1

C
2.6 × 10⁸ ms^–1

D
5.2 × 10⁸ ms^–1
Question 9
4 / -1

A flat plate moves normally with a speed v₁ towards a horizontal jet of water of uniform area of cross-section. The jet discharges water at the rate of volume V per second at a speed of v₂. The density of water is ρ. Assume that water splashes along the surface of the plate at right angles to the original motion. The magnitude of the force acting on the plate due to the jet of water is

A

B

C

D
Question 10
4 / -1

A rope of mass 0.1 kg is connected at the same height of two opposite walls. It is allowed to hang under its own weight. At the contact point between the rope and the wall, the rope makes an angle θ=10° with respect to horizontal. The tension in the rope at its midpoint between the wall is

A
2.78 N

B
2.56 N

C
2.82 N

D
2.71 N