Q:

Which of the following is not a commercial source of energy?

A) Coal	B) Petroleum
C) Natural Gas	D) Firewood

Answer & Explanation Answer: D) Firewood

Explanation:

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Q:

Spring tides occur when ______.

A) the moon, the sun and the earth are in the same line	B) the sun is closest to earth
C) the moon is farthest from earth	D) the earth is at right angles with the sun and the moon

Answer & Explanation Answer: A) the moon, the sun and the earth are in the same line

Explanation:

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Q:

Fuse wire is made of an alloy of

A) Tin and Lead	B) Tin and Copper
C) Lead and Copper	D) Copper and Silver

Answer & Explanation Answer: A) Tin and Lead

Explanation:

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Q:

When body is accelerated--

A) Its velocity never changes.	B) Its speed will always change.
C) Its direction always changes.	D) Its speed may or may not change.

Answer & Explanation Answer: D) Its speed may or may not change.

Explanation:

Uniform circular motion, that is constant speed along a circular path, is an example of a body experiencing acceleration resulting in velocity of a constant magnitude but the change of direction

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Q:

If a body takes 't' seconds to go once round the circular path of radius 'r', the velocity 'v' is given by

A) v=t2πr	B) v=2πrt
C) v=2πr2t	D) v=πr2t

Answer & Explanation Answer: B) v=2πrt

Explanation:

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Q:

Mangifera indica is the scientific name of

A) Guava	B) Mango
C) Amla	D) Jack fruit

Answer & Explanation Answer: B) Mango

Explanation:

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Q:

The large collection of stars, dust and gas held together by gravitational attraction between components is known as

A) Cluster	B) Atmosphere
C) Galaxy	D) Sun Family

Answer & Explanation Answer: C) Galaxy

Explanation:

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Q:

The Ozone layer is present in which atmospheric layer?

A) Lithosphere	B) Ionosphere
C) Stratosphere	D) Biosphere

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