- Ain alternating current of direct current
- ✓alternating current into direct current
- Chigh voltage to low voltage or low voltage to high voltage
- Dchanging direct current into fixed direct current
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Two bulbs of 500 watt and 200 watt are manufactured to operate on 220 volt line. The ratio of heat produced in 500 W and 200 W, in two cases, when firstly they are joined in parallel and secondly in series, will be
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(a) |
(b) |
(c) |
(d) |
If V be the accelerating voltage, then the maximum frequency of continuous X-rays is given by
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(a) |
(b) |
(c) |
(d) |
The ratio of the largest to shortest wavelengths in Lyman series of hydrogen spectra is
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(a) |
(b) |
(c) |
(d) |
Which one of the following statements is not correct
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(a) A diode does not obey Ohm's law |
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(b) A PN junction diode symbol shows an arrow identifying the direction of current (forward) flow |
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(c) An ideal diode is an open switch |
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(d) An ideal diode is an ideal one way conductor |