Select the correct statement
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(a) In a full wave rectifier, two diodes work alternately |
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(b) In a full wave rectifier, two diodes work simultaneously |
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(c) The efficiency of full wave and half wave rectifiers is same |
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(d) The full wave rectifier is bi-directional. |
(a) In a full wave rectifier, two diodes work alternately
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You are given a resistance wire of length 50 cm and a battery of negligible resistance. In which of the following cases is largest amount of heat generated
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(a) When the wire is connected to the battery directly |
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(b) When the wire is divided into two parts and both the parts connected to the battery in parallel |
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(c) When the wire is divided into four parts and all the four connected to the battery in parallel |
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(d) When only half the wire is connected to the battery |
If the distance between the plates of parallel plate capacitor is halved and the dielectric constant of dielectric is doubled, then its capacity will
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(a) Increase by 16 times |
(b) Increase by 4 times |
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(c) Increase by 2 times |
(d) Remain the same |
In a copper voltameter experiment, current is decreased to one-fourth of the initial value but it is passed for four times the earlier duration. Amount of copper deposited will be
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(a) Same |
(b) One-fourth the previous value |
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(c) Four times the previous value |
(d) |
In comparison to a half wave rectifier, the full wave rectifier gives lower
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(a) Efficiency |
(b) Average dc |
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(c) Average output voltage |
(d) None of these |
The transformation ratio in the step-up transformer is
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(a) 1 |
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(b) Greater than one |
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(c) Less than one |
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(d) The ratio greater or less than one depends on the other factors |
Compton effect shows that
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(a) X-rays are waves |
(b) X-rays have high energy |
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(c) X-rays can penetrate matter |
(d) Photons have momentum |
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 |
