Physics – Atoms Molecules and Nuclei – MCQs TEST (Maharashtra HSC Board)

Physics – Atoms Molecules and Nuclei – TEST  (MCQ Maharashtra HSC Board)

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#1. Which of the following is true for a radioactive nucleus?

It emits α, β, γ simultaneously

It emits only α_ and/ (β but simultaneously

It emits α, β, γ in sequence

It can emit any of the α or β or γ but one at a time

#2. In Davisson Germer experiment the angel of diffraction is 52˚. What is the glancing angle?

52˚

78˚

64˚

40˚

#3. What are nuclei that have the same number of protons but different number of neutrons called?

α-particles

Isotopes

Isobars

β-particles

#4. The half life of a radioactive element is 6 days. How much time is required for the decay of 7/8 of the element?

18 days

42/8 days

35/8 days

12 days

#5. These rays have the maximum penetrating power

γ- rays

X-rays

α– rays

β – rays

#6. An α particle can be expressed as being composed of

1p + 1n

2p + 1n

2p + 2n

1p + 2n

#7. The Layman transitions involve

Smallest changes of energy

Largest changes of energy

Largest changes in potential energy

Smallest changes in potential energy

#8. What is the radius of Bohr’s orbit proportional to?

Principle of quantum number

Reciprocal of principal quantum number

Square of principal quantum number

Reciprocal of square of the principal quantum number

#9. What did the experiment of Davisson and Germer prove?

Wave nature of light

Matter wave of electron

Matter wave of proton

Particle nature of light

#10. Who promoted the idea of matter waves?

Maxwell

De Borglie

Einstein

Davisson and Germer

#11. The series which lies in the ultra-violet region of the spectrum of a hydrogen atom is called

Brackett series

Lyman series

Paschen series

Balmer series

#12. The radius of the hydrogen atom in the second excited sates is

4.77 Angstrom

3.18 Angstrom

2.12 Angstrom

1.5 Angstrom

#13. Produced by the angular moment of electrons?

Magnetic moment

Nuclear fusion

Light

Zeeman Effect

Previous

Finish