An electron microscope is superior to an optical microscope in
|
(a) Having better resolving power |
(b) Being easy to handle |
|
(c) Low cost |
(d) Quickness of observation |
(a) Having better resolving power
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In a Young's experiment, two coherent sources are placed 0.90 mm apart and the fringes are observed one metre away. If it produces the second dark fringe at a distance of 1 mm from the central fringe, the wavelength of monochromatic light used would be
|
(a) 60 |
(b) 10 |
(c) 10 |
(d) 6 |
In diode, when there is saturation current, the plate resistance (
is
|
(a) Zero |
(b) Infinite |
|
(c) Some finite quantity |
(d) Data is insufficient |
The peak voltage in the output of a half-wave diode rectifier fed with a sinusoidal signal without filter is 10 V. The dc component of the output voltage is
|
(a) 10/ |
(b) 10/p V |
(c) 10 V |
(d) 20/p V |
Avalanche breakdown is due to
|
(a) Collision of minority charge carrier |
(b) Increase in depletion layer thickness |
|
(c) Decrease in depletion layer thickness |
(d) None of these |
In hydrogen atom, electron makes transition from n=4 to n=1 level. Recoil momentum of the H atom will be
|
(a) 3.4 |
(b) 6.8 |
|
(c) 3.4 |
(d) 6.8 |
The chemical equivalent of copper and zinc are 32 and 108 respectively. When copper and silver voltameter are connected in series and electric current is passed through for sometimes, 1.6 g of copper is deposited. Then, the mass of silver deposited will be
|
(a) 3.5 g |
(b) 2.8 g |
(c) 5.4 g |
(d) None of these |
The sensitivity of a tangent galvanometer is increased if
| (a) Number of turn decreases | (b) Number of turn increases |
| (c) Field increases | (d) None of the above |
The radius of curvature for a convex lens is 40 cm, for each surface. Its refractive index is 1.5. The focal length will be
|
(a) 40 cm |
(b) 20 cm |
(c) 80 cm |
(d) 30 cm |
