- A$\mu_0 \frac{d \phi_{ E }}{d t}$
- B$\mu_0 \in_0 \frac{d \phi_{ E }}{d t}$
- ✓$\in_0 \frac{d \phi_{ E }}{d t}$
- D$\frac{1}{\in_0} \frac{d \phi_{ E }}{d t}$
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The electrical circuits used to get smooth d.c. output from a rectifier circuit is called
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(a) Filter |
(b) Amplifier |
(c) Full wave rectifier |
(d) Oscillator |
Assertion : A star which appears blue will be much hotter than the sun
Reason : It is based on Wien's law
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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 : The quantity L/R possesses dimensions of time.
Reason : To reduce the rate of increases of current through a solenoid should increase the time constant (L/R).
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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. |
Which of the following is deflected by electric field
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(a) X-rays |
(b) γ -rays |
(c) Neutrons |
(d) α -particles |
An electron enters between two horizontal plates separated by 2mm and having a potential difference of 1000V. The force on electron is
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(a) 8 |
(b) 8 |
(c) 8 |
(d) 8 |
A galaxy is observed to be moving with a velocity of 8600 km-sec–1. If it is at a distance of 430 million light year from us, Hubble constant and corresponding age of the universe are respectively
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(a) 2 |
(b) 2 |
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(c) |
(d) None of these |
Assertion : In all conductors, for studying the thermoelectric behaviour or metals, lead is taken as a reference metal.
Reason : In lead, the Thomson effect is negative.
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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. |