Question # 1

Half life of C-14 ________________ years.

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5800

5700

5600

5500

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

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Absorb

Radiate

Nothing

Nil

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

Which of the following result in discovery of proton?

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cathode rays

canal rays

x-rays

alpha rays

The p subshell has:

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one orbital

two orbitals

three orbitals

four orbitals

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

Hydrogen has ________________ isotopes.

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1

2

3

4

Atoms of elements combine chemically to form:

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Mixtures

compounds

solutions

ions

___________ is used in treatment of cancer.

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Nil

Cobalt-60

C-12

H-3

Cathode rays are actually

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Electrons

Protons

Neutrons

Photons

According to Bohr, electrons can revolve only in this orbits whose angular momentum is

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h/2π

n 2h/π

n h2/2π

n h/2π

The lowest energy level is

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K

L

M

N

Energy of a shell is ________________

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Variable

Constant

Cannot be changed

Nil

The number of electrons in K shell of O is ________________

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9

10

2

1

"Atoms" means _________

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Divisible

Indivisible

Break

Nil

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

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2

8

18

32

Alpha particles are double charged.

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Negative

Positive

Can be both

Nil

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