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 Physics Questions

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Q:

A transformer can do all of the following except

A) step­-up a/c voltage B) step­-up a/c current
C) step­-up a/c power D) step­-down a/c voltage
 
Answer & Explanation Answer: C) step­-up a/c power

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Exam Prep: Bank Exams

1 1967
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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Exam Prep: CAT , Bank Exams , AIEEE

1 1966
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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0 1962
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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0 1961
Q:

The time taken by a pendulum to complete one oscillation is called its?

A) Maximum speed B) Average speed
C) Time period D) Time interval
 
Answer & Explanation Answer: C) Time period

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3 1960
Q:

Find the resistance (in mega ohm) of a wire of length 8 m, cross sectional area 2 sq.cm and made of a material of resistivity 120 ohm m.

A) 1920 B) 4.8
C) 2.4 D) 960
 
Answer & Explanation Answer: B) 4.8

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2 1956
Q:

An object of 10 kg is moving with a speed of 2 m/s. The kinetic energy of the object is

A) 20 J B) 25 J
C) 10 J D) 40 J
 
Answer & Explanation Answer: A) 20 J

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0 1953
Q:

When ice floats on water, its _____ part remains outside the water.

A) 0.5 B) 0.3
C) 0.1 D) 1
 
Answer & Explanation Answer: C) 0.1

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1 1950