Chemistry - Questions and Answers, General Study (GK)

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31.

Which one of the following has highest frequency?

(a)Cosmic rays

(b)X-rays

(c)Radio waves

(d)Microwaves

Comment

Answer is: ANA

32.

Which of the following isotopes of carbon is/are used in carbon dating?

(a)₆C¹² only

(b)₆C¹³ only

(c)₆C¹⁴ only

(d)₆C¹² and ₆C¹⁴ only

Comment

Answer is: CNA

33.

By which one of the following an old written material which cannot be read easily, can be read?

(a)γ-rays

(b)X-rays

(c)IR-rays

(d)Radio frequency waves

Comment

Answer is: BNA

34.

Which one of the following is not radioactive?

(a)Astatine

(b)Francium

(c)Tritium

(d)Zirconium

Comment

Answer is: DNA

35.

X-rays comprise of

(a)electrons only

(b)protons only

(c)neutrons only

(d)electromagnetic radiations

Comment

Answer is: DNA

36.

A radioactive substance has a half life of four months. Three-fourth of the substance would decay in

(a)3 months

(b)4 months

(d)12 months

Comment

Answer is: CNA

37.

Cobalt-60 is commonly used in radiation therapy because it emits

(a)∝-rays

(b)beta rays

(c)gamma rays

(d)X-rays

Comment

Answer is: CNA

38.

Which one of the following elements is essential for construction in nuclear reactors?

(a)Cobalt

(b)Nickel

(c)Zirconium

(d) Tungsten

Comment

Answer is: CNA

39.

An ∝-particle consists of which of the following?

(a)2 protons and 2 neutrons

(b)1 proton and 1 electron

(d)1 proton and 1 neutron

Comment

Answer is: ANA

40.

The ratio of velocity of X-rays to that of gamma rays is

(a)< 1

(b)> 1

(d)depends upon the ratio of their frequencies.

Comment

Answer is: CNA

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Chemistry - Questions and AnswersPage 4

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