The principle of working of a hydrogen bomb is MCQ with Answer and Explanation

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The principle of working of a hydrogen bomb is

A. Nuclear fusion

B. Chain reaction

C. Chemical explosion

D. Nuclear fission

Answer: Option A

Solution (By JKSSB Mock Tests)

Hydrogen bomb uses uncontrolled fusion of deuterium and tritium triggered by fission bomb. Releases vast energy, thermonuclear reaction. Sun's energy is fusion.

This question belongs to: Science Physics

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Question #1

A transformer steps up 220 V to 2200 V. The turn ratio (secondary to primary) is

A. 1:10

B. 220:1

C. 1:1

D. 10:1

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Correct Answer: Option D

Explanation:
For ideal transformer, V_s/V_p = N_s/N_p. So N_s/N_p = 2200/220 = 10. So secondary turns 10 times primary. Ratio 10:1. Step-up increases voltage.

This question belongs to: Science Physics

Question #2

Microscope resolution improved by:

A. Lower magnification

B. Oil immersion

C. Longer wavelength light

D. Smaller numerical aperture

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Correct Answer: Option B

Explanation:
Oil immersion increases numerical aperture (NA) by matching refractive indices, improving resolution d = λ/(2NA). Memory tip: 'Higher NA or shorter λ ⇒ better resolution'. Optical instrument concept frequently tested in competitive exams.

This question belongs to: Science Physics

Question #3

The work done by a centripetal force in half revolution is

A. 2F r

B. πrF

C. mv²

D. Zero

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Correct Answer: Option D

Explanation:
Centripetal force always perpendicular to displacement, work zero.

This question belongs to: Science Physics

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