Physics - Questions and Answers, General Study (GK)

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371.

Energy is continuously generated in the sun due to

(a)nuclear fusion

(b)Nuclear fission

(c)Radioactivity

(d)Artificial radioactivity

Comment

Answer is: ANA

372.

The phenomenon of ejection of electrons from the surface of metals, when light of suitable wavelengths falls on it, is known as

(a)electrolysis

(b)ionization

(c)Photo electric effect

(d)none of the above

Comment

Answer is: CNA

373.

Which of the following nuclei undergo fission when struck by thermal neutrons
1. U²³⁵
2. U²³⁸
3. Pu²³⁹
Select the correct answer using the codes given below.

(a)1 and 2

(b)2 and 3

(d)1, 2 and 3

Comment

Answer is: CNA

374.

If a U²³⁸ nucleus splits into two identical parts, the two nuclei so produced will be

(a)radioactive

(b)Stable

(c)isotopes

(d)isobars

Comment

Answer is: CNA

375.

Consider the following metals
1. Uranium
2. Radium
3. Plutonium
Which of these are used in making nuclear weapons?

(a)1 and 2

(b)1, 2 and 3

(d)1 and 3

Comment

Answer is: DNA

376.

A nuclear reactor harness nuclear energy by

(a)nuclear fusion

(b)spontaneous fission

(c)uncontrolled chain reaction

(d)Controlled chain reaction

Comment

Answer is: DNA

377.

If a proton of mass 'm' is moving with the velocity of light, its mass will be

(a)unchanged

(b)large but finite

(c)infinite

(d)zero

Comment

Answer is: CNA

378.

The mass-energy relation is the out come of

(a)quantum theory

(b)General theory of relativity

(c)field theory of relativity

(d)Special theory of relativity

Comment

Answer is: DNA

379.

What does the term Dobly B or Dolby C printed on tape recorders and other sound systems refer to?

(a)frequency modulated system

(b)amplitude modulated system

(c)noise reduction circuit

(d)both DC and AC power can be used

Comment

Answer is: CNA

380.

Particles which can be added to the nucleus of an atom without changing its chemical properties are

(a)electrons

(b)Protons

(c)neutrons

(d)Alpha particles

Comment

Answer is: CNA

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Physics - Questions and AnswersPage 38

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