Which is the correct diagram of a half-wave rectifier
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(a) |
(b) |
|
(c) |
(d) |
Which is the correct diagram of a half-wave rectifier
|
(a) |
(b) |
|
(c) |
(d) |
(b)
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The central point of a spherical mirror is called:
In X-ray tube when the accelerating voltage V is halved, the difference between the wavelength of Ka line and minimum wavelength of continuous X-ray spectrum
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(a) Remains constant |
(b) Becomes more than two times |
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(c) Becomes half |
(d) Becomes less than two times |
In a PN-junction diode not connected to any circuit
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(a) The potential is the same everywhere |
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(b) The P-type is a higher potential than the N-type side |
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(c) There is an electric field at the junction directed from the N- type side to the P- type side |
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(d) There is an electric field at the junction directed from the P-type side to the N-type side |
γ-rays radiation can be used to create electron-positron pair. In this process of pair production, γ-rays energy cannot be less than
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(a) 5.0 MeV |
(b) 4.02 MeV |
(c) 15.0 MeV |
(d) 1.02 MeV |
A battery having e.m.f. 5V and internal resistance 0.5 W is connected with a resistance of 4.5 W then the voltage at the terminals of battery is
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(a) 4.5 V |
(b) 4 V |
(c) 0 V |
(d) 2 V |
Assertion : In a simple battery circuit the point of lowest potential is positive terminal of the battery
Reason : The current flows towards the point of the higher potential as it flows in such a circuit from the negative to the positive terminal.
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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. |
Solar energy is mainly caused due to
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(a) Fission of uranium present in the sun |
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(b) Fusion of protons during synthesis of heavier elements |
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(c) Gravitational contraction |
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(d) Burning of hydrogen in the oxygen |