Chemistry - Questions and Answers, General Study (GK)

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101.

Select the correct statement based on Rutherford's model.

(a)Most of the space in an atom between the nucleus and the revolving electron is empty

(b)Electrons are called planetary electrons

(c)Protons give positive charge on the nucleus but nuclear mass is determined by proton and neutron both

(d)All of the above

Comment

Answer is: DNA

102.

In an x-ray tube, potential differences if several thousand volts accelerate electrons which then hit the target and x-ray are emitted. Why are the x-rays emitted?

(a)Because of electron transition in an atom

(b)Because of removal of an electron from an atom

(c)Because electron get decelerated

(d)Because of the heat produced in the collision

Comment

Answer is: CNA

103.

A body is charged negatively. it implies that

(a)It has lost some of its proton

(b)It has lost some of its electron

(c)It has gained some electrons from outside

(d)None of the above

Comment

Answer is: CNA

104.

An atom of deuterium (1H2) is composed of

(a)One electron and two protons

(b)One electron and one proton

(c)One electron, one proton and one neutron

(d)One electron, one proton and two neutrons

Comment

Answer is: CNA

105.

A body is charged negatively. it implies that

(a)It has lost some of its proton

(b)It has lost some of its electron

(c)It has gained some electrons from outside

(d)None of the above

Comment

Answer is: CNA

106.

Which of the following is the correct statement about proton?

(a)Proton is nucleus of deuterium

(b)Proton is α-particle

(c)Proton is ionized hydrogen molecule

(d)Proton is ionized hydrogen

Comment

Answer is: DNA

107.

Which involves the emission of least energy in the hydrogen atom?

(a)An electron moving from n=4 to n=2

(b)An electron moving from n=3 to n=2

(c)An electron moving from n=4 to n=1

(d)An electron moving from n=5 to n=2

Comment

Answer is: BNA

108.

The end product of 23290 This 20882Pb. The number of alpha and beta particles emitted are respectively.

(a)3, 3

(b)4, 6

(d)6, 4

Comment

Answer is: DNA

109.

Radioactive substance used in dating geological object is

(a)C-12

(b)C-11

(c)C-14

(d)None of these

Comment

Answer is: CNA

110.

Which electromagnetic radiation is emitted by radioactive substances?

(a)γ-rays

(b)Radio waves

(c)Microwaves

(d)x-rays

Comment

Answer is: ANA

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Chemistry - Questions and AnswersPage 11

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