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.
Peltier co-efficient of a thermo couple is 2 nano volts. How much heat is developed at a junction if 2.5 amp current flows for 2 minute
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(a) 6 ergs |
(b) 6 |
(c) 16 ergs |
(d) 6 |
An expression for rate of heat generated, if a current of I ampere flows through a resistance of R W, is
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(a) |
(b) |
(c) |
(d) IR |
The temperature of the cold junction of thermo‑couple is 0℃ and the temperature of hot junction is T℃. The e.m.f. is E = 16T – 0.04
volts. The temperature of inversion is
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(a) 200 ℃ |
(b) 400 ℃ |
(c) 100 ℃ |
(d) 300 ℃ |
A steady current of 5 amps is maintained for 45 mins. During this time it deposits 4.572 gms of zinc at the cathode of a voltameter. E.C.E. of zinc is
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(a) 3.387 |
(b) 3.387 |
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(c) 3.384 |
(d) 3.394 |
Assertion : Electric appliances with metallic body; e.g. heaters, presses etc, have three pin connections, whereas an electric bulb has a two pin connection.
Reason : Three pin connections reduce heating of connecting cables.
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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. |
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