- Aonly for light waves
- ✓only for sound waves
- Conly for mechanical waves
- Dfor all the mentioned waves
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Which of the following is used to produce radio waves of constant amplitude
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(a) Oscillator |
(b) FET |
(c) Rectifier |
(d) Amplifier |
The graph that correctly represents the relation of frequency n of a particular characteristic X-ray with the atomic number Z of the material is
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(a)
|
(b)
|
(c)
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(d)
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Two lenses of power + 12 and – 2 diopters are placed in contact. The combined focal length of the combination will be
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(a) 8.33 cm |
(b) 1.66 cm |
(c) 12.5 cm |
(d) 10 cm |
The angle of polarisation for any medium is 60o, what will be critical angle for this
|
(a) |
(b) |
(c) |
(d) |
Two charges each of 1 coulomb are at a distance 1 km apart, the force between them is
|
(a) |
(b) 9 |
|
(c) |
(d) |
The new resistance of wire of R W, whose radius is reduced half, is
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(a) 16 R |
(b) 3 R |
(c) 2R |
(d) R |