Minimum deviation is observed with a prism having angle of prism A, angle of deviation δ, angle of incidence i and angle of emergence e. We then have generally
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(a) i > e |
(b) i < e |
(c) i = e |
(d) i = e = δ |
(c) i = e
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Assertion : Light is produced in gases in the process of electric discharge through them at high pressure.
Reason : At high pressure electrons of gaseous atoms collide and reach and excited state.
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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. |
The charge density in a nucleus varies with distance from the centre of the nucleus according to the curve in Fig.
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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 bar magnet when placed at an angle of 30o to the direction of magnetic field induction of 5 × 10–2 T, experiences a moment of couple 25 × 10–6 N-m. If the length of the magnet is 5 cm its pole strength is
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(a) 2 × 10–2 A-m |
(b) 5 × 10–2 A-m |
(c) 2 A-m |
(d) 5 A-m |
The working of dynamo is based on principle of
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(a) Electromagnetic induction |
(b) Conversion of energy into electricity |
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(c) Magnetic effects of current |
(d) Heating effects of current |
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 |
When is the real image formed?
