- APositively charged.
- BNegatively charged.
- CUncharged.
- DUncharged at 0K but charged at higher temperatures.
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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 approximate ratio of resistances in the forward and reverse bias of the PN-junction diode is
|
(a) |
(b) |
(c) |
(d) |
Assertion : Blue colour of sky appears due to scattering of blue colour.
Reason : Blue colour has shortest wave length in visible spectrum.
|
(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. |
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 |
The total power content of an AM wave is 900 W. For 100% modulation, the power transmitted by each side band is
|
(a) 50 W |
(b) 100 W |
(c) 150 W |
(d) 200 W |
A 10 μF capacitor is charged to a potential difference of 50 V and is connected to another uncharged capacitor in parallel. Now the common potential difference becomes 20 volt. The capacitance of second capacitor is
|
(a) 10 μF |
(b) 20 μF |
(c) 30 μF |
(d) 15 μF |