Explanation:
In a photodiode, photocurrent is directly proportional to intensiy of incident light. More the incident light intensity, more will be the current produced.
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Two resistors of resistance 
and 
having 
are connected in parallel. For equivalent resistance R, the correct statement is
|
(a) |
(b) |
(c) |
(d) |
When connected across the terminals of a cell, a voltmeter measures 5V and a connected ammeter measures 10 A of current. A resistance of 2 ohms is connected across the terminals of the cell. The current flowing through this resistance will be
|
(a) 2.5 A |
(b) 2.0 A |
(c) 5.0 A |
(d) 7.5 A |
A semiconductor device is connected in a series circuit with a battery and a resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops almost to zero. The device may be
| (a) A P-type semiconductor | (b) An N-type semiconductor |
| (c) A PN-junction | (d) An intrinsic semiconductor |
Watt-hour meter measures
|
(a) Electric energy |
(b) Current |
(c) Voltage |
(d) Power |
A convex lens forms a real image of an object for its two different positions on a screen. If height of the image in both the cases be 8 cm and 2 cm, then height of the object is
|
(a) 16 cm |
(b) 8 cm |
(c) 4 cm |
(d) 2 cm |
By ammeter, which of the following can be measured
|
(a) Electric potential |
(b) Potential difference |
(c) Current |
(d) Resistance |
