- ✓Infrared rays
- BX-rays
- CUltra-violet rays
- DGamma rays
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Field inside a solenoid is
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(a) Directly proportional to its length |
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(b) Directly proportional to current |
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(c) Inversely proportional to total number of turns |
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(d) Inversely proportional to current |
The energy of a photon of light with wavelength 5000 Å is approximately 2.5 eV. This way the energy of an X-ray photon with wavelength 1Å would be
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(a) 2.5/5000 eV |
(b) |
(c) 2.5 × 5000 eV |
(d) |
Assertion : Electron has higher mobility than hole in a semiconductor.
Reason : Mass of electron is less than the mass of hole.
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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 | B | Y |
| 0 | 0 | 0 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 1 |
Find out the value of current through 2Ω resistance for the given circuit
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(a) 5 A |
(b) 2 A |
(c) Zero |
(d) 4 A |
Hubble showed that the universe as a whole is expanding and the distant stars are receding from us. The spectral line from a star, when compared with the corresponding line from an source will then show
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(a) A shift in frequency towards the red end |
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(b) A shift in frequency towards the violet end |
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(c) No shift in frequency at all |
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(d) A shift in frequency towards the violet end as well as a decrease in intensity |
When a lamp is connected in series with capacitor, then
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(a) Lamp will not glow |
(b) Lamp will burst out |
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(c) Lamp will glow normally |
(d) None of these |