- AElectromagnetic radiation with high energy.
- BElectromagnetic radiation with low energy.
- CCharged particles emitted by the nucleus.
- DElectrons orbiting the nucleus.
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A ray of light is incident at 50° on the middle of one of the two mirrors arranged at an angle of 60° between them. The ray then touches the second mirror, get reflected back to the first mirror, making an angle of incidence of
|
(a) 50° |
(b) 60° |
(c) 70° |
(d) 80° |
Two PN-junctions can be connected in series by three different methods as shown in the figure. If the potential difference in the junctions is the same, then the correct connections will be
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(a) In the circuit (1) and (2) |
(b) In the circuit (2) and (3) |
| (c) In the circuit (1) and (3) | (d) Only in the circuit (1) |
A thin slice is cut out of a glass cylinder along a plane parallel to its axis. The slice is placed on a flat glass plate as shown. The observed interference fringes from this combination shall be
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(a) Straight |
|
(b) Circular |
|
(c) Equally spaced |
|
(d) Having fringe spacing which increases as we go outwards |
An e.m.f. of 12 volt is produced in a coil when the current in it changes at the rate of 45 amp/minute. The inductance of the coil is
|
(a) 0.25 henry |
(b) 1.5 henry |
(c) 9.6 henry |
(d) 16.0 henry |
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 |
A sample contains 16 gm of a radioactive material, the half life of which is two days. After 32 days, the amount of radioactive material left in the sample is
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(a) Less than 1 mg |
(b) |
(c) |
(d) 1 gm |