- AFlint glass prism
- BDirect vision prism
- CNicol prism
- DQuartz prism
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Every atom makes one free electron in copper. If 1.1 ampere current is flowing in the wire of copper having 1 mm diameter, then the drift velocity (approx.) will be (Density of copper = 9 and atomic weight = 63)
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(a) 0.3 mm/sec |
(b) 0.1 mm/sec |
(c) 0.2 mm/sec |
(d) 0.2 mm/sec |
Two uniform wires A and B are of the same metal and have equal masses. The radius of wire A is twice that of wire B. The total resistance of A and B when connected in parallel is
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(a) 4 Ω when the resistance of wire A is 4.25 Ω |
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(b) 5 Ω when the resistance of wire A is 4.25 Ω |
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(c) 4 Ω when the resistance of wire B is 4.25 Ω |
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(d) 4 Ω when the resistance of wire B is 4.25 Ω |
Two short magnets placed along the same axis with their like poles facing each other repel each other with a force which varies inversely as
| (a) Square of the distance | (b) Cube of the distance |
| (c) Distance | (d) Fourth power of the distance |
Assertion : Television signals are received through sky-wave propagation.
Reason : The ionosphere reflects electromagnetic waves of frequencies greater than a certain critical frequency.
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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. |
The focal length of a converging lens are fv and fr for violet and red light respectively: