MCQ
A photoelectric cell is a device which?
- AConverts light into electricity.
- BConverts electricity into light.
- CStores light.
- DStores electricity.
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When the accelerating voltage applied on the electrons increased beyond a critical value
|
(a) Only the intensity of the various wavelengths is increased |
| (b) Only the wavelength of characteristic relation is affected |
| (c) The spectrum of white radiation is unaffected |
|
(d) The intensities of characteristic lines relative to the white spectrum are increased but there is no change in their wavelength |
Three long, straight parallel wires carrying current, are arranged as shown in figure. The force experienced by a 25 cm length of wire C is
|
(a) 10-3 N |
(b) 2.5 ×10-3 N |
(c) Zero |
(d) 1.5 × 10-3 N |
Bragg’s law for X-rays is
| (a) d sin θ = 2n λ | (b) 2dsin θ = n λ |
(c) n sin θ = 2 λ d |
(d) None of these |
The reading of the ammeter as per figure shown is
|
(a) |
(b) |
(c) |
(d) 2 A |