The (๐ – ๐) graph for a coil is
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(a)
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(b)
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(c)
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(d)
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The (๐ – ๐) graph for a coil is
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(a)
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(b)
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(c)
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(d)
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(a)

Generate a complete, print-ready paper with questions like this in minutes โ across 16+ boards, with answer keys.
For a cell of e.m.f. 2V, a balance is obtained for 50 cm of the potentiometer wire. If the cell is shunted by a 2โฆ resistor and the balance is obtained across 40 cm of the wire, then the internal resistance of the cell is
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(a) 0.25 โฆ |
(b) 0.50 โฆ |
(c) 0.80 โฆ |
(d) 1.00 โฆ |
Assertion : Lenz’s law violates the principle of conservation of energy.
Reason : Induced e.m.f., opposes always the change in magnetic flux responsible for its production.
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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 assertion is false but reason is true. |
The equivalent resistance of the following diagram A and B is
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(a) |
(b) 9 W |
(c) 6 W |
(d) None of these |
Laser beams are used to measure long distance because
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(a) They are monochromatic |
(b) They are highly polarised |
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(c) They are coherent |
(d) They have high degree of parallelism |
Assertion : A charged capacitor is disconnected from a battery. Now if its plate are separated farther, the potential energy will fall.
Reason : Energy stored in a capacitor is equal to the work done in charging it.
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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 assertion is false but reason is true. |
The solar constant on the surface of the earth is S. What will be its value on the surface of another planet which is about 5.3 A.U. away from sun
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(a) |
(b) |
(c) 5.3 S |
(d) (5.3)2 S |