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In a parallel beam of white light is incident on a converging lens, the colour which is brought to focus nearest to the lens is
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(a) Violet |
(b) Red |
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(c) The mean colour |
(d) All the colours together |
Assertion : In photoemissive cell inert gas is used.
Reason : Inert gas in the photoemissive cell gives greater current.
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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 : When the speed of an electron increases its specific charge decreases.
Reason : Specific charge is the ratio of the charge to mass.
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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 refractive index of a certain glass is 1.5 for light whose wavelength in vacuum is 6000 Å. The wavelength of this light when it passes through glass is
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(a) 4000 Å |
(b) 6000 Å |
(c) 9000 Å |
(d) 15000 Å |
Assertion : An N-type semiconductor has a large number of electrons but still it is electrically neutral.
Reason : An N-type semiconductor is obtained by doping an intrinsic semiconductor with a pentavalent impurity.
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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 combination of two resistors, of 1W each, is connected in series with a 1.5 W resistor. The total combination is connected across a 10 V battery. The current flowing in the circuit is
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(a) 5 A |
(b) 20 A |
(c) 0.2 A |
(d) 0.4 A |
An ammeter gives full scale deflection when current of 1.0 A is passed in it. To convert it into 10 A range ammeter, the ratio of its resistance and the shunt resistance will be
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(a) 1 : 9 |
(b) 1 : 10 |
(c) 1 : 11 |
(d) 9 : 1 |