- A$10^{-7}$ Gauss
- B$10^{-4}$ Gauss
- ✓$10^{4}$ Gauss
- D$10^{-8}$ Gauss
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The image formed by a concave mirror:
As the temperature of hot junction of a thermo‑couple is increased (while cold junction is at constant temperature), the thermo e.m.f.
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(a) Increases uniformly at constant rate |
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(b) Increases slowly in the beginning and more rapidly at higher temperatures |
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(c) Increases more rapidly in the beginning but less rapidly at higher temperatures |
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(d) In minimum at neutral temperature |
Assertion : Base in a transistor is made very thin as compared to collector and emitter regions.
Reason : Due to thin base power gain and voltage gain is obtained by a transistor.
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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. |
At a place the value of horizontal component of the earth's magnetic field H is 3
. A metallic rod AB of length 2 m placed in east-west direction, having the end A towards east, falls vertically downward with a constant velocity of 50 m/s. Which end of the rod becomes positively charged and what is the value of induced potential difference between the two ends
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(a) End A, 3 |
(b) End A, 3 mV |
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(c) End B, 3 |
(d) End B, 3 mV |
Assertion : A metallic shield in form of a hollow shell may be built to block an electric field.
Reason : In a hollow spherical shield, the electric field inside it is zero at every point.
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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. |
In Bohr’s model of hydrogen atom, which of the following pairs of quantities are quantized
| (a) Energy and linear momentum | (b) Linear and angular momentum |
| (c) Energy and angular momentum | (d) None of the above |
What is the path difference of destructive interference
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(a) nl |
(b) n(λ + 1) |
(c) |
(d) |