Beta Particles MCQs with Answers

Beta Particles MCQs

β -rays are fast moving electrons from nucleus. Nucleus emits an electron by converting a neutron in the nucleus into proton. Hence the basic equation which can represent the beta decay can be written as,

n → p + e + antineutrino

Neutrino and antineutrino are particles with very less mass and no charge. In process of beta decay the mass number of nucleus remains unchanged but mass number increases by 1.

The general form of reaction can be given as,

Q.1)  During emission of β – particles from radioactive atom the atomic number increases by…

a) 1

b) 2

c) 3

d) 4

Q.2)  During emission of β – particles from radioactive atom the atomic mass…….

a) increases by 1

b) decreases by 1

c) remains unchanged

d) none of these

Q.3) In β – decay the total mass of product atom of decay is…….. that of parent atom

a) same as

b) less than

c) more than

d) either less or more than

Q.4) Ionisation power of beta particles is……of alpha particles.

a) (1/10)th

b) (1/100)th

a) (1/1000)th

d) same as that

Q.5) The range of beta particle of 0.5 MeV in air is……

a) 100 m

b) 10 m

c) 1 m

d) 0.1 m

Q.6) The process in which proton gets converted in to neutron by emitting positron and neutrino is known as……

a) β+ decay

b) β- decay

c) γ+ decay

d) γ- decay

Q.7) Which among the following is correct for β – particles?

a) β – particles does not gets deflected by electric and magnetic field.

b) β – particles are more penetrating those alpha particles.

c) Speed of β – particles is more than that of light.

d) β – particles are visible.

Q.8) Which among the following is correct for β – particles?

 

 

 

 

 

 

 

 

 

Q.9) The energy emitted in beta decay is represented as……

a) Q = [mX + mY – me] c2

b) Q = [mX – mY + me] c2

c) Q = [mX + mY + me] c2

d) Q = [mX – mY – me] c2

Q.10) Which among the following is not correct for β – particles?

a) They ionize gas when passed through gas.

b) They affect photographic plate.

c) They have high penetration power.

d) They are neutral hence not deflected by electric and magnetic field.

 

Answers:

Q.1) a) 1

Q.2) c) remains unchanged

Q.3) b) less than

Q.4) b) (1/100)th

Q.5) c) 1 m

Q.6) a) β+ decay

Q.7) b) β – particles are more penetrating those alpha particles.

Q.8) a)

Q.9) Q = [mX – mY – me] c2

Q.10) d) They are neutral hence not deflected by electric and magnetic field..


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