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Q:

The absolute refractive index of any medium is always:

A) more than one B) 0
C) 1 D) less than one
 
Answer & Explanation Answer: A) more than one

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Q:

Heat flows as a result of difference of _____.

A) Temperature B) Density
C) mass D) Volume
 
Answer & Explanation Answer: A) Temperature

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Q:

For a body moving with uniform acceleration its final velocity equals _________________.

A) average velocity - initial velocity B) 2 x average velocity - initial velocity
C) 2 x average velocity + initial velocity D) average velocity + initial velocity
 
Answer & Explanation Answer: B) 2 x average velocity - initial velocity

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Q:

In the gamma decay of a nucleus

A) the mass number of the nucleus changes whereas its atomic number does not change B) the mass number of the nucleus does not change whereas its atomic number changes
C) both the mass number and the atomic number of the nucleus change D) neither the mass number nor the atomic number of the nucleus changes
 
Answer & Explanation Answer: D) neither the mass number nor the atomic number of the nucleus changes

Explanation:

The emission of gamma rays does not alter the number of protons or neutrons in the nucleus but instead has the effect of moving the nucleus from a higher to a lower energy state (unstable to stable)

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Q:

Where is a transistor most likely to be found ?

A) Wrist watch B) Fuse
C) Hearing aid D) Fluorescent lamp
 
Answer & Explanation Answer: C) Hearing aid

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Q:

The reflector of a search light is a :

A) Convex mirror B) Concave mirror
C) Plane mirror D) Cylindrical mirror
 
Answer & Explanation Answer: B) Concave mirror

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Q:

The bending of light when it passes around a corner or a slit is due to ______.

A) reflection B) refraction
C) diffraction D) total internal reflection
 
Answer & Explanation Answer: C) diffraction

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Q:

What is the phenomenon which established the transverse nature of light ?

A) Reflection B) Interference
C) Diffraction D) Polarisation
 
Answer & Explanation Answer: D) Polarisation

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