- AChemical reaction
- BElastic reaction
- CThermonuclear reaction
- DPhotonuclear reaction
Explanation:
In nuclear physics,nuclear fusion is a nuclear reaction in which two or more atomic nuclei collide at very high speed and join to form a new type of atomic nucleus. During this process matter is not conserved because some of the matter of fusing nuclei is converted to photons also known as thermonuclear reaction.
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Certain radio-active substance reduces to 25% of its value in 16 days. Its half-life is
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(a) 32 days |
(b) 8 days |
(c) 64 days |
(d) 28 days |
Assertion : When a tiny circular obstacle is placed in the path of light from some distance, a bright spot is seen at the centre of shadow of the obstacle.
Reason : Destructive interference occurs at the centre of the shadow.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
A parallel beam of monochromatic light of wavelength 5000 Å is incident normally on a single narrow slit of width 0.001 mm. The light is focused by a convex lens on a screen placed on the focal plane. The first minimum will be formed for the angle of diffraction equal to
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(a) 0o |
(b) 15o |
(c) 30o |
(d) 60o |
The magnetic induction in air at a distance d from an isolated point pole of strength m unit will be
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(a) |
(b) |
(c) md |
(d) |
Which of the following statement is wrong
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(a) Voltmeter should have high resistance |
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(b) Ammeter should have low resistance |
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(c) Ammeter is placed in parallel across the conductor in a circuit |
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(d) Voltmeter is placed in parallel across the conductor in a circuit |