Question # 1

The value of Planck's constant is

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6.63 x 10-34 Js

6.63 x 10-32 Js

6.63 x 10-30 Js

6.63 x 10-28 Js

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

Electron ________________ energy when they jump from low to higher level.

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Absorb

Radiate

Nothing

Nil

"Atoms" means _________

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Divisible

Indivisible

Break

Nil

The isotopes C-12 is present in abundance of:

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96.6%

97.6%

99.7%

None of these

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

Who discovered the proton?

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Goldstein

J.J Thomson

Neil Bohr

Ruther Ford

Which of the following result in discovery of proton?

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cathode rays

canal rays

x-rays

alpha rays

L shell can accommodate ________________ electrons.

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2

8

18

32

Half life of C-14 ________________ years.

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5800

5700

5600

5500

The number of isotopes of carbon are

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1

2

3

5

Neuron was discovered by

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Sir Willium Crooks

Goldstein

James Chadwik

Neil Bohr

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