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Q:

An atom bomb based upon the principal of ________

A) Nuclear fission B) Nuclear fussion
C) Controlled chain reaction D) None of these
 
Answer & Explanation Answer: A) Nuclear fission

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Q:

Energy is continuously generated in the sun due to

A) Nuclear fusion B) Nuclear fission
C) Radioactivity D) Artificial radioactivity
 
Answer & Explanation Answer: A) Nuclear fusion

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Q:

The core of an electromagnet is made of soft iron because soft iron has 

A) small susceptibility and small retentivity B) large susceptibility and small retentivity
C) large density and large retentivity D) small density and large retentivity
 
Answer & Explanation Answer: B) large susceptibility and small retentivity

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Q:

Two bulbs are fitted in a room in the domestic electric installation. One of them glows brighter than the other. Then

A) the brighter bulb has smaller resistance B) the brighter bulb has larger resistance
C) both the bulbs have the same resistance D) none of these
 
Answer & Explanation Answer: A) the brighter bulb has smaller resistance

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Q:

When light enters from air to water, then its 

A) frequency increases and speed decreases B) frequency is same but the wavelength is smaller in water than in air
C) frequency is same but the wavelength is larger in water than in air D) frequency and speed both decreases
 
Answer & Explanation Answer: B) frequency is same but the wavelength is smaller in water than in air

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Q:

When a ray of light is  refracted by a prism such that the angle of deviation is minimum then

A) the angle of emergence is equal to the angle of incidence B) the angle of emergence is greater than the angle of incidence
C) the angle of emergence is smaller than the angle of incidence D) the sum of the angle of incidence and the angle of emergence is equal to 90 degrees
 
Answer & Explanation Answer: A) the angle of emergence is equal to the angle of incidence

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Q:

If a sound travels from air to water, the quantity that remain unchanged is

A) velocity B) frequency
C) wavelength D) amplitude
 
Answer & Explanation Answer: B) frequency

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Q:

Ultrasonic waves are used for stirring liquid solutions because they 

A) do not produce noise during the operation B) are easy to produce
C) can produce perfectly homogeneous solutions D) do not produce chemical reactions in the solution
 
Answer & Explanation Answer: C) can produce perfectly homogeneous solutions

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