Work, Energy and Power Test

Result

Work, Energy and Power Test - 32

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Weekly Quiz Competition

Question 1
4 / -1

Velocity time graph of a particle of mass 2kg moving in a straight line is as shown in fig. Work done by all forces on the particle is

A
400 J

B
–400 J

C
–200 J

D
200 J

Solution
Question 2
4 / -1

A solid sphere rolls without slipping and presses a spring of spring constant k as shown in Fig. Then the compression in the spring will be

A

B

C

D

Solution
Question 3
4 / -1

The blocks of mass m each are connected to a spring of spring constant k as shown. The maximum displacement in the block is

A

B

C

D

Solution
Question 4
4 / -1

A

B

C

D

Solution
Question 5
4 / -1

The bob A of a simple pendulum is released when the string makes an angle of 45⁰ with the vertical. It hits another bob B of the same material and same mass kept at rest on the table. If the collision is elastic

A
both A and B rise to the same height

B
both A and B come to rest at B

C
both A and B move with the velocity of A

D
A comes to rest and B moves with the velocity of A
Question 6
4 / -1

If W₁, W₂, W₃ represent the work done in moving a particle from A to B along three different paths 1,2,3 respectively as shown in the gravitational field of a point mass m , find the correct relation between W₁, W₂ and W₃

A
W₁ > W₂ > W₃

B
W₁ = W₂ = W₃

C
W₁ < W₂ < W₃

D
W₂ > W₁ > W₃
Question 7
4 / -1

A stationary particle explodes into two particles of masses m₁ and m₂ which move in opposite directions, with velocities v₁ and v₂. The ratio of their kinetic energies (E₁ / E₂) is

A
m₂/m₁

B
m₁/m₂

C
1

D
m₁v₂ / m₂v₁

Solution
Question 8
4 / -1

Power supplied to a particle of mass 2 kg varies with time as P = 3 t²/2 watt, where t is in seconds. If velocity of particle at t = 0 is v = 0, the velocity of particle at t = 2 sec will be

A
1 m/s

B
4 m/s

C
2 m/s

D
2 √2m/s

Solution
Question 9
4 / -1

Liquid of density ρ flows along a horizontal pipe of uniform area of cross section a with a velocity v through a right angled bend. What force should be applied to the bend to hold it in equilibrium?

A

B

C

D

Solution
Question 10
4 / -1

A chain of length l and mass M is held on a frictionless table with (1/n)th part hanging over the edge. Work done in pulling the chain is directly proportional to

A
√n

B
n

C
n^-3

D
n^-2

Solution