Physics Questions

Q:

The atomic bomb is based on the principle of

A) Uncontrolled nuclear fusion B) Uncontrolled nuclear fission
C) Controlled nuclear fission D) Controlled nuclear fusion
 
Answer & Explanation Answer: B) Uncontrolled nuclear fission

Explanation:
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Q:

Which one of the following statements with regard   to   Jet   stream,   an   upper   level tropospheric wave, is not correct?

A) It is narrow band of high-velocity wind. B) It   follows   the   wave   path   near   the tropopause at elevations of 8 km to 15 km.
C) Jet  streams  are typically  continuous over long distances. D) In summer, the polar front jet achieves its maximum force.
 
Answer & Explanation Answer: B) It   follows   the   wave   path   near   the tropopause at elevations of 8 km to 15 km.

Explanation:

All  are  correct  except  D,  as  Jet streams  are  phenomena  of  winter. It   is   believed   that   jet   stream exercises  an  important  influence on the winter weather in India.

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Q:

According to the Second Law of Motion, for a given force, acceleration is inversely proportional to the ____ of an object.

A) density B) volume
C) force D) mass
 
Answer & Explanation Answer: D) mass

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Q:

During _____________ motion of an object along a straight line, the velocity remains constant with time.

A) linear B) translational
C) uniform D) equilibrium
 
Answer & Explanation Answer: C) uniform

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Q:

What is the power rating (in W) of a bulb if a current of 0.3 A passes through on application of 240 V of potential difference across its terminals?

A) 800 B) 36
C) 400 D) 72
 
Answer & Explanation Answer: D) 72

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Q:

If a body moves with a uniform speed in a circular motion, then______.

A) its acceleration is increasing B) its acceleration is zero
C) its velocity is changing D) its velocity is uniform
 
Answer & Explanation Answer: C) its velocity is changing

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Q:

Find the position of the image formed by a concave mirror when the object is placed between P and F?

A) At infinity B) Between F and C
C) Behind the mirror D) Beyond C
 
Answer & Explanation Answer: C) Behind the mirror

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Q:

1kWH = .........J

A) 3.6×10^-8 B) 3.6×10^-6
C) 3.6×10^8 D) 3.6×10^6
 
Answer & Explanation Answer: D) 3.6×10^6

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