Dynamo is a device for converting
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(a) Electrical energy into mechanical energy |
|
(b) Mechanical energy into electrical energy |
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(c) Chemical energy into mechanical energy |
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(d) Mechanical energy into chemical energy |
(b) Mechanical energy into electrical energy
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Weber/m2 is equal to
|
(a) Volt |
(b) Henry |
(c) Tesla |
(d) All of these |
For non-conductors, the energy gap is
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(a) 6 eV |
(b) 1.1 eV |
(c) 0.8 eV |
(d) 0.3 eV |
Which of the following statements is not true
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(a) The resistance of intrinsic semiconductors decrease with increase of temperature |
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(b) Doping pure Si with trivalent impurities give P-type semiconductors |
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(c) The majority carriers in N-type semiconductors are holes |
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(d) A PN-junction can act as a semiconductor diode |
When germanium is doped with phosphorus, the doped material has
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(a) Excess positive charge |
(b) Excess negative charge |
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(c) More negative current carriers |
(d) More positive current carriers |
The ratio of secondary to primary turns is 9 : 4. If power input is P, what will be the ratio of power output (neglect all losses) to power input
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(a) 4 : 9 |
(b) 9 : 4 |
(c) 5 : 4 |
(d) 1 : 1 |
Which gates is represented by this figure
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(a) NAND gate |
(b) AND gate |
(c) NOT gate |
(d) OR gate |
In an interference experiment, third bright fringe is obtained at a point on the screen with a light of 700 nm. What should be the wavelength of the light source in order to obtain 5th bright fringe at the same point
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(a) 500 nm |
(b) 630 nm |
(c) 750 nm |
(d) 420 nm |