Pure inductor.
Pure capacitor.
Explanation:
Instantaneous current is zero when the intantaneous voltage is maximum.
Mean resistance = 0.
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Consider telecommunication through optical fibres. Which of the following statements is not true
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(a) Optical fibres may have homogeneous core with a suitable cladding |
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(b) Optical fibres can be of graded refractive index |
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(c) Optical fibres are subject to electromagnetic interference from outside |
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(d) Optical fibres have extremely low transmission loss |
Three resistors are connected to form the sides of a triangle ABC, the resistance of the sides AB, BC and CA are 40 ohms, 60 ohms and 100 ohms respectively. The effective resistance between the points A and B in ohms will be
|
(a) 32 |
(b) 64 |
(c) 50 |
(d) 200 |
The energy of electron in the nth orbit of hydrogen atom is expressed as 
. The shortest and longest wavelength of Lyman series will be
| (a) 910 Å, 1213 Å | (b) 5463 Å, 7858 Å | (c) 1315 Å, 1530 Å | (d) None of these |
Assertion : Television signals are received through sky-wave propagation.
Reason : The ionosphere reflects electromagnetic waves of frequencies greater than a certain critical frequency.
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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. |
There is a uniform electric field of strength 
along y-axis. A body of mass 1g and charge 
is projected into the field from origin along the positive x-axis with a velocity 10m/s. Its speed in m/s after 10s is (Neglect gravitation)
|
(a) 10 |
(b) 5 |
(c) 10 |
(d) 20 |
Assertion : The poles of magnet cannot be separated by breaking into two pieces.
Reason : The magnetic moment will be reduced to half when a magnet is broken into two equal pieces.
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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. |
n identical cells each of e.m.f. E and internal resistance r are connected in series. An external resistance R is connected in series to this combination. The current through R is
|
(a) |
(b) |
(c) |
(d) |
