For a cell, the graph between the potential difference (V) across the terminals of the cell and the current (I) drawn from the cell is shown in the figure. The e.m.f. and the internal resistance of the cell are
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(a) 2V, 0.5Ω |
(b) 2V, 0.4 Ω |
(c) >2V, 0.5 Ω |
(d) > 2V, 0.4 Ω |
(b) 2V, 0.4 Ω
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Which one is reverse-biased
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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 hollow double concave lens is made of very thin transparent material. It can be filled with air or either of two liquids L1 and L2 having refractive indices n1 and n2 respectively (n2 > n1 > 1). The lens will diverge a parallel beam of light if it is filled with
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(a) Air and placed in air |
(b) Air and immersed in L1 |
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(c) L1 and immersed in L2 |
(d) L2 and immersed in L1 |
The current flowing in two coaxial coils in the same direction. On increasing the distance between the two, the electric current will
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(a) Increase |
(b) Decrease |
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(c) Remain unchanged |
(d) The information is incomplete |
A thin plano-convex lens acts like a concave mirror of focal length 0.2 m when silvered from its plane surface. The refractive index of the material of the lens is 1.5. The radius of curvature of the convex surface of the lens will be
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(a) 0.4 m |
(b) 0.2 m |
(c) 0.1 m |
(d) 0.75 m |
As our eyes can not retrace the bent path of light, a stick, dipped in water, appears:
Energy of electrons can be increased by allowing them
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(a) To fall through electric potential |
(b) To move in high magnetic field |
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(c) To fall from great heights |
(d) To pass through lead blocks |
