Out of the following, which is not emitted by radioactive substance?

The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then

A

$${\frac{3}{4}^{{\text{th}}}}$$ of it will disintegrate in two months

B

It will completely disintegrate in two months

C

It will completely disintegrate in four months

D

$${\frac{l}{8}^{{\text{th}}}}$$ of it will remain intact at the end of four months

__________ are not emitted by radioactive substances.

A

α-rays

B

β-rays

C

Protons

D

Positrons

Which among the following is a positively charged particle emitted by a radioactive element?

A

Beta ray

B

Alpha ray

C

Cathode ray

D

Gamma ray

Beta rays emitted by a radioactive material are

A

The electrons orbiting around the nucleus

B

Charged particles emitted by nucleus

C

Neutral particles

D

Electromagnetic radiations

240 radioactive grams of goo loses half its radioactivity every 10 days. How many grams of radioactive goo is left in 40 days?

A

120

B

60

C

15

D

none

A radioactive substance does not emit

A

α-ray

B

Proton

C

Position

D

β-ray

Emission of β-particles during radioactive decay of a substance is from

A

Innermost shell

B

Nucleus

C

Outermost shell

D

None of these

Chemical potential (an intensive property) of a substance is a force that drives the chemical system to equilibrium and is equal to its partial molar properties. The reatio of chemical potential to free energy of a pure substance at oconstant temperature and pressure is

A

0

B

1

C

∞

D

None of these

Which of the following pollutants is not emitted during volcanic eruptions?

A

SO₂

B

H₂S

C

CO

D

Hydrocarbons

Which of the following is NOT a radioactive element?

A

Uranium

B

Plutonium

C

Titanium

D

Thorium

Out of the following, which is not emitted by radioactive substance?

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