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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:

The Brownian Motion was discovered by

A) Robert Brown B) Mandel Brown
C) Isaac Newton D) John Brown
 
Answer & Explanation Answer: A) Robert Brown

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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:

In a concave mirror when the object is placed at infinity which of the following applies to the image?

A) Real, inverted, highly enlarged image at center of curvature (C) B) Real, inverted image of the same size at centre of curvature (C)
C) Real, inverted, diminished image between centre of curvature (C) and principal focus (F) D) Real, inverted, highly diminished image at focus
 
Answer & Explanation Answer: D) Real, inverted, highly diminished image at focus

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Q:

Which of the following devices helps to maintain a potential difference across a conductor?

A) Galvanometer B) Ammeter
C) Voltmeter D) A cell or battery
 
Answer & Explanation Answer: D) A cell or battery

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Q:

The work done in one complete revolution of the moon around the earth is equal to

A) centripetal force x radius of the orbit of the moon B) gravitational force x circumference of the orbit of the moon
C) gravitational force x diameter of the orbit of the moon D) zero
 
Answer & Explanation Answer: D) zero

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Q:

A unit of power is called a

A) Joule B) Pascal
C) Newton D) Watt
 
Answer & Explanation Answer: B) Pascal

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Q:

An object of 1.2 cm height is placed 30 cm before a concave mirror of focal length of 20 cm toget a real image at a distance of 60 cm from the mirror. What is the height of the image formed?

A) -3.6 cm B) -2.4 cm
C) 1.2 cm D) 2.4 cm
 
Answer & Explanation Answer: B) -2.4 cm

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