Q:

What is the SI unit of Charge?

A) Coulomb	B) Amperes
C) Watts	D) Joules

Answer & Explanation Answer: A) Coulomb

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Q:

What is the upward force exerted by water called?

A) Density	B) Buoyant force
C) Gravitation	D) Friction

Answer & Explanation Answer: B) Buoyant force

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Q:

An echo is returned in 3 s. What is the distance of the reflecting surface from the source, considering the speed of sound as $342 {ms}^{- 1}$ ?

A) 513 m	B) 644 m
C) 342 m	D) 171 m

Answer & Explanation Answer: A) 513 m

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Q:

One step in the production of hydroelectric power involves _____.

A) falling water that turns a turbine	B) electric current flowing across a dam
C) hot water from under the ground	D) tides that pour through a barrier dam

Answer & Explanation Answer: A) falling water that turns a turbine

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Q:

The speed of the light is maximum in

A) Air	B) Vacuum
C) Water	D) Glass

Answer & Explanation Answer: B) Vacuum

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Q:

The acceleration due to gravity at the surface of the earth (mass M and radius R) is proportional to ___.

A) MR	B) M/R2
C) M2/R	D) M/R

Answer & Explanation Answer: B) M/R2

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Q:

The diameter of the reflecting surface of a spherical mirror is called a/an

A) principal axis	B) aperture
C) focus	D) pole

Answer & Explanation Answer: B) aperture

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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

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