Question # 1

Neuron was discovered by

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Sir Willium Crooks

Goldstein

James Chadwik

Neil Bohr

Hydrogen has ________________ isotopes.

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1

2

3

4

Which of the following can accommodate 18 electrons?

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K

L

M

N

Canal rays are actually

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Electrons

Protons

Neutrons

X-rays

Which radioisotope is used for the diagnosis of tumor in the body?

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cobalt-60

iodine-131

strontium-90

phosphorus-30

Half life of C-14 ________________ years.

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5800

5700

5600

5500

The concept of orbit was used by:

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J.J Thomson

Rutherford

Bohr

Planck

The number of electrons in K shell of O is ________________

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9

10

2

1

Which one of the following is the most penetrating?

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protons

electrons

neutrons

alpha paticles

The p subshell has:

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one orbital

two orbitals

three orbitals

four orbitals

Alpha particles are double charged.

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Negative

Positive

Can be both

Nil

The number of isotopes of carbon are

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1

2

3

5

In 9th century scientist accepted by:

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Dalton

Bohars

Rutherford

Nil

The isotopes C-12 is present in abundance of:

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96.6%

97.6%

99.7%

None of these

The no.of neutrons in deutrium is

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1

2

3

4

The boiling point of H2O is:

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100

12

1.105

9

For diagnosis of goiter in thyroid gland we use

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Co-60

C-14

I-131

Sr-90

L shell can accommodate ________________ electrons.

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2

8

18

32

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