Radioactivity is
|
(a) Irreversible process |
(b) Self disintegration process |
|
(c) Spontaneous process |
(d) All of the above |
Radioactivity is
|
(a) Irreversible process |
(b) Self disintegration process |
|
(c) Spontaneous process |
(d) All of the above |
(d) All of the above
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A light source approaches the observer with velocity 0.8 c. The doppler shift for the light of wavelength 5500 Å is
|
(a) 4400 Å |
(b) 1833 Å |
(c) 3167 Å |
(d) 7333 Å |
The resistance of hot tungsten filament is about 10 times the cold resistance. What will be the resistance of 100 W and 200 V lamp when not in use
|
(a) 400 Ω |
(b) 200 Ω |
(c) 40 Ω |
(d) 20 Ω |

Assertion : Current is passed through a metallic wire, heating it red. When cold water is poured on half of its portion, then rest of the half portion become more hot.
Reason : Resistances decreases due to decrease in temperature and so current through wire increases.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |