296 questions across 1 question group — pick any mix to generate a Physics paper with step-by-step answer keys.
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
Two bulbs are in parallel and they together consume 48 W from a battery of 6 V. The resistance of each bulb is
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(a) 0.67 Ω |
(b) 3.0 Ω |
(c) 4.0 Ω |
(d) 1.5 Ω |
The current flowing in a copper voltameter is 1.6 A. The number of 
ions deposited at the cathode per minute are
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(a) 1.5 |
(b) 3 |
(c) 6 |
(d) 1 |
The emf of a thermocouple, one junction of which is kept at 0℃, is given by 
the Peltier co-efficient will be
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(a) (t + 273) (a + 2bt) |
(b) (t + 273) (a – 2bt) |
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(c) (t – 273) (a- 2bt) |
(d) (t – 273) (a – 2bt) |
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.
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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. |
Assertion : An electric bulb is first connected to a dc source and then to a ac source having the same brightness in both the cases.
Reason : The peak value of voltage for an A.C. source is 
times the root mean square voltage.
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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 assertion is false but reason is true. |
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