- AMovement of electron.
- BLeakage of charge.
- CIonization of atoms.
- DUniform charge distribution.
Explanation:
When a positive or negative charged body comes close to another body, the electrons of the second body redistribute themselves. Electrons of the second body are attracted by the positively charged body and repelled by the negatively charged body.
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A galvanometer of 50 ohm resistance has 25 divisions. A current of 4 × 10–4 ampere gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of 25 volts, it should be connected with a resistance of
|
(a) 2500 W as a shunt |
(b) 2450 W as a shunt |
|
(c) 2550 W in series |
(d) 2450 W in series |
The de-Broglie wavelength of an electron having 80eV of energy is nearly (1eV = 1.6 × 10–19 J, Mass of electron = 9 × 10–31kg Plank’s constant = 6.6 × 10–34 J-sec)
|
(a) 140 Å |
(b) 0.14 Å |
(c) 14 Å |
(d) 1.4 Å |
A heater of 220 V heats a volume of water in 5 minute time. A heater of 110 V heats the same volume of water in
|
(a) 5 minutes |
(b) 8 minutes |
(c) 10 minutes |
(d) 20 minutes |
Five resistors are connected as shown in the diagram. The equivalent resistance between A and B is
| (a) 6 ohm | (b) 9 ohm |
(c) 12 ohm |
(d) 15 ohm |
Assertion : Television signals are received through sky-wave propagation.
Reason : The ionosphere reflects electromagnetic waves of frequencies greater than a certain critical frequency.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
