Work, Energy and Power (KVPY Stream-SA (Class 11) Physics): Questions 1 - 4 of 24

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Question number: 1

» Work, Energy and Power » Work-Energy Theorem

Appeared in Year: 2011

MCQ▾

Question

A body of 0.5 kg moves along the positive x-axis under the influence of a varying force F (in Newton) as shown below.

Graph of force F (in N) ⟶ distance x (in cm)

Graph of Force F (In N) ⟶ Distance X (In Cm)

In figure a graph of a moving body along x-axis under the influence of a varying force F (in N) is shown.

If the speed of the object at x = 4 m in 3.16 ms –1 then its speed at x = 8m is,

Choices

Choice (4) Response

a.

3.16ms

b.

6.8ms

c.

8ms

d.

9.3ms

Question number: 2

» Work, Energy and Power » Power

Appeared in Year: 2011

MCQ▾

Question

A 750 W motor drivers a pump which lifts 300 liters of water per minute to a height of 6 meters. The efficiency of the motor is nearly (take acceleration due to gravity to be 10 m/s 2)

Choices

Choice (4) Response

a.

30%

b.

20%

c.

50%

d.

40%

Question number: 3

» Work, Energy and Power » Kinetic Energy

Appeared in Year: 2012

MCQ▾

Question

A clay ball of mass m and speed v strikes another metal ball of same mass m, which is at rest. They stick together after collision. The kinetic energy of the system after collision is:

Choices

Choice (4) Response

a.

mv2

b.

2mv2

c.

mv22

d.

mv24

Question number: 4

» Work, Energy and Power » Conservation of Mechanical Energy

MCQ▾

Question

A small metal ball is pushed from a height h along smooth hemispherical glass cup. If the height of the cup is R, the speed required to push it such that it just reaches the top of the opposite end of the cup is,

Choices

Choice (4) Response

a.

2gh

b.

2gR

c.

2g(Rh)

d.

2g(R+h)

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