Question # 1

Which of these is not a radiation detector

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Wilson cloud chamber

cyclotron acceleration

Geiger Miller counter

solid state detector

The number of all the protons and neutrons in a nucleus is known as

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atomic number

mass number

charge number

none of these

Nucleus consists of

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proton and neutron

protons and electron

electron and neutron

protons only

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

Which of the following material has smaller has life

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uranium

polonium

radium

radian

Radioactivity is

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self disruptive activity

spontaneous activity

exhibited by all elements under proper conditions

both 'a' and 'b'

The time required for a radioactive material to decrease in active by one half is called

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half time

half life

disintegration time

mean life

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

Alfa particles are

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hydrogen nuclei

helium nuclei

electrons

photons

The missing mass which is converted to energy in the formation of nucleus, is called

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packing fraction

mass defect

binding energy

none of these

Charge on neutron is

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1.6 x 10^-19C

zero

-1.6 x 10^-19C

1.2 x 10^-19C

The emission of radiations take place in elements, having charge number greater than

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109

82

69

52

The mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called

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nuclear fission

nuclear fusion

man defect

radioactivity

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

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Equal to 1

Less than 1

Greater than 1

Infinity

Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:

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50

100

150

200

250

The rate of decay of radioactive substance

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is constant

decrease exponentially with time

varies inversely as time

decreases linearly with time

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