Explanation:
The electrons in any conductor are under continuous motion but in random way. There's no net crossing of charge carriers through a given cross-section. Without potential difference, the electrons move randomly in all directions.The randomly moving electrons in a metal wire will start moving in a particular direction when a potential difference is applied across it.
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The focal lengths of the objective and eye-lens of a microscope are 1 cm and 5 cm respectively. If the magnifying power for the relaxed eye is 45, then the length of the tube is
|
(a) 30 cm |
(b) 25 cm |
(c) 15 cm |
(d) 12 cm |
When 
undergoes fission, 0.1% of its original mass is changed into energy. How much energy is released if 1kg of 
undergoes fission
|
(a) 9 |
(b) 9 |
(c) 9 |
(d) 9 |
If a current of 10 A flows in one second through a coil, and the induced e.m.f. is 10 V, then the self-inductance of the coil is
|
(a) |
(b) |
(c) |
(d) 1 H |
The distance between charges 5 × 
and -2.7 
is 0.2 m. The distance at which a third charge should be placed in order that it will not experience any force along the line joining the two charges is
|
(a) 0.44 m |
(b) 0.65 m |
(c) 0.556 m |
(d) 0.350 m |
In the case of forward biasing of PN-junction, which one of the following figures correctly depicts the direction of flow of carriers
(a)
|
(b)
|
(c)
|
(d)
|
A thin lens with focal length f to be used as magnifying glass. Which of the following statements regarding the situation is true?
When light of wavelength λ is incident on an equilateral prism kept in its minimum deviation position, it is found that the angle of deviation equals the angle of the prism itself. The refractive index of the material of the prism for the wavelength λ is, then
|
(a) |
(b) |
(c) 2 |
(d) |
