Question # 1

Hydrogen has ________________ isotopes.

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1

2

3

4

In a discharge tube, the pressure of a gas is kept at

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10-2 atm

10-4 atm

10-6 atm

10-8 atm

The concept of orbit was used by:

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J.J Thomson

Rutherford

Bohr

Planck

Deuterium is used to make:

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light water

heavy water

soft water

hard water

Who discovered the proton?

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Goldstein

J.J Thomson

Neil Bohr

Ruther Ford

Alpha particles are double charged.

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Negative

Positive

Can be both

Nil

Which of the following result in discovery of proton?

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cathode rays

canal rays

x-rays

alpha rays

The isotopes C-12 is present in abundance of:

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96.6%

97.6%

99.7%

None of these

Atoms of elements combine chemically to form:

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Mixtures

compounds

solutions

ions

Cathode rays are actually

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Electrons

Protons

Neutrons

Photons

"Atoms" means _________

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Divisible

Indivisible

Break

Nil

For diagnosis of goiter in thyroid gland we use

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Co-60

C-14

I-131

Sr-90

The isotopes of an element have different number of

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Electrons

Protons

Neutrons

Protons & Neutrons

Half life of C-14 ________________ years.

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5800

5700

5600

5500

The maximum no.of electrons that can be accommodated in M shell are

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2

8

18

32

Which one of the following is the most penetrating?

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protons

electrons

neutrons

alpha paticles

The number of isotopes of carbon are

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1

2

3

5

The lowest energy level is

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K

L

M

N

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