Q:

A rocket is launched to travel vertically upward with a constant velocity of 20 m/s. After travelling for 35 seconds, the rocket develops a snag and its fuel supply is cut off. The rocket then travels like a free body. The height achieved by it is

A) 680 m	B) 720 m
C) 800 m	D) 700 m

Answer & Explanation Answer: B) 720 m

Explanation:

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Q:

What does the kinetic energy (KE) of a moving body depend upon?

A) Mass & its position	B) Weight & its position
C) Mass & acceleration	D) Mass & velocity

Answer & Explanation Answer: D) Mass & velocity

Explanation:

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Q:

The rate of change of velocity is called

A) Momentum	B) Speed
C) Acceleration	D) Force

Answer & Explanation Answer: C) Acceleration

Explanation:

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Q:

During the free fall of the object, the decrease in potential energy, at any point in its path, appears as an equal amount of increase in _________________.

A) kinetic energy	B) work done
C) heat energy	D) gravitational force

Answer & Explanation Answer: A) kinetic energy

Explanation:

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Q:

An object of 5.0 kg is raised through a height of 2.0m. The work done in the process is

A) 49 J	B) 10 J
C) 19.6 J	D) 98 J

Answer & Explanation Answer: D) 98 J

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Q:

A solar eclipse occurs when

A) moon comes in the middle of sun and earth	B) sun comes in the middle of moon and earth
C) earth comes in the middle of moon and sun	D) All of the above

Answer & Explanation Answer: A) moon comes in the middle of sun and earth

Explanation:

A solar eclipse happens when the moon gets in the way of the sun's light and casts its shadow on Earth. Solar eclipses happen when the New Moon comes between the Sun and Earth and blocks out the Sun's rays.

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Q:

Which of the following is NOT an example of potential energy?

A) Running water	B) Water stored in a dam
C) A raised hammer	D) A compressed spring

Answer & Explanation Answer: A) Running water

Explanation:

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Q:

What is the heat generated (in J) in a heating element of resistance 800 Ω when a current of 0.2 A passes through it for 40 seconds?

A) 6400	B) 1280
C) 640	D) 3200

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