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If Fresnel’s biprism experiment as held in water inspite of air, then what will be the effect on fringe width
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(a) Decrease |
(b) Increase |
(c) No effect |
(d) None of these |
As the switch S is closed in the circuit shown in figure, current passed through it is
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(a) 4.5 A |
(b) 6.0 A |
(c) 3.0 A |
(d) Zero |
If in a plano-convex lens, the radius of curvature of the convex surface is 10 cm and the focal length of the lens is 30 cm, then the refractive index of the material of lens will be
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(a) 1.5 |
(b) 1.66 |
(c) 1.33 |
(d) 3 |
Three capacitors of 2.0, 3.0 and 6.0 μF are connected in series to a 10 V source. The charge on the 3.0 μF capacitor is
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(a) 5 μC |
(b) 10 μC |
(c) 12 μC |
(d) 15 μC |
If a full wave rectifier circuit is operating from 50 Hz mains, the fundamental frequency in the ripple will be
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(a) 50 Hz |
(b) 70.7 Hz |
(c) 100 Hz |
(d) 25 Hz |
For comparing the e.m.f.'s of two cells with a potentiometer, a standard cell is used to develop a potential gradient along the wires. Which of the following possibilities would make the experiment unsuccessful
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(a) The e.m.f. of the standard cell is larger than the E e.m.f.'s of the two cells |
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(b) The diameter of the wires is the same and uniform throughout |
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(c) The number of wires is ten |
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(d) The e.m.f. of the standard cell is smaller than the e.m.f.'s of the two cells |
Assertion : Electric lines of force cross each other.
Reason : Electric field at a point superimpose to give one resultant electric field.
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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. |