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Q:

For what is Radiocarbon dating technique used?

A) To estimate soil contamination B) To estimate the amount of water in fossils
C) To estimate the age of fossils D) To estimate the quality of soil
 
Answer & Explanation Answer: C) To estimate the age of fossils

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Q:

Who does not the kinetic energy of an object increase with?

A) Friction B) Time
C) Mass D) Speed
 
Answer & Explanation Answer: D) Speed

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Q:

What is the principal focus of a spherical mirror?

A) It is a point from which the rays of light appear to be coming from on the principal axis of a convex mirror B) It is the point on the principal axis through which rays of light parallel to the principal axis pass after reflection or appear to be arising from this point on the principal axis
C) It is the centre of a hollow sphere of which the spherical mirror is a part D) It is the midpoint of a spherical mirror
 
Answer & Explanation Answer: B) It is the point on the principal axis through which rays of light parallel to the principal axis pass after reflection or appear to be arising from this point on the principal axis

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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

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Q:

According to Ohm's law, if current (I) increase and potential difference (V) remains constant, then

A) resistance unchanged B) resistance decreases
C) potential difference decreases D) resistance increases
 
Answer & Explanation Answer: B) resistance decreases

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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:

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:

If a body is whirled in a circle, then the work done on it ___.

A) is zero B) is positive
C) cannot be determined D) is negative
 
Answer & Explanation Answer: A) is zero

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