Physics Mcqs

Quality of X-rays depends upon ____________ A-filament current B-accelerating voltage C-material of the target ?

• (A)  A & B
• (B)  B & C
• (C)  A & C
• (D)  A B & C

Answer

Submitted By :Ali Uppal

When X-rays are passed through successive aluminum sheets what happens to their thickness ?

• (A)  increases
• (B)  it decreases
• (C)  it remains same
• (D)  sometimes increases and sometimes decreases

Answer

Submitted By :Ali Uppal

X-rays are similar in nature to_______________?

• (A)  Cathode rays
• (B)  Positive rays
• (C)  γ-rays
• (D)  Beta rays

Answer

Submitted By :Ali Uppal

In an electronic transition atom cannot emit______________?

• (A)  γ-rays
• (B)  Infra red radiation
• (C)  Visible light
• (D)  Ultraviolet rays

Answer

Submitted By :Ali Uppal

Radiation with wavelength longer than red lights______________?

• (A)  ultraviolet rays
• (B)  X-rays
• (C)  infra red radiation
• (D)  visible radiation

Answer

Submitted By :Ali Uppal

Reverse process of photoelectric effect is_______________?

• (A)  pair production
• (B)  Compton effect
• (C)  annihilation of matter
• (D)  X-rays production

Answer

Submitted By :Ali Uppal

In He-Ne laser the lasing action is produced by_______________?

• (A)  Ne only
• (B)  He-Ne both
• (C)  Electrons of He
• (D)  Electrons Ne

Answer

Submitted By :Ali Uppal

The metastable state for an atom in laser light is_____________?

• (A)  10-4 sec
• (B)  10-5 sec
• (C)  10-3 sec
• (D)  10-8 sec

Answer

Submitted By :Ali Uppal

In laser production the state in which more atoms are in the upper state than in the lower one is called_____________?

• (A)  Metal stable state
• (B)  Normal state
• (C)  Inverted population
• (D)  All the above

Answer

Submitted By :Ali Uppal

In normal state of energy the incident high energy photons will be______________?

• (A)  Stimulated
• (B)  Absorbed
• (C)  Cause X-ray emission
• (D)  Cause laser production

Answer

Submitted By :Ali Uppal