Photocells convert
Options
(a) heat energy into electrical energy (b) light energy into mechanical energy (c) thermal energy into mechanical energy (d) light energy into electrical energy
Correct Answer:
light energy into electrical […]
The drift speed of electrons in copper wire of diameter and length l is v. If the potential difference across the wire is doubled, then the new drift speed becomes
Options
(a) v […]
Two bulbs 60 W and 100 W designed for voltage 220 V are connected in series across 220 V source. The net power dissipated is
Options
(a) 80W (b) 160W (c) 37.5W (d) […]
When alpha particles captures and electron, then it becomes a
Options
(a) helium atom (b) hydrogen atom (c) helim ion (d) hydrogen ion
Correct Answer:
helim ion
Explanation:
No explanation available. Be the […]
The ratio of volumes of nuclei (assumed to be in spherical shape) with respective mass number 8 and 64 is
Options
(a) 0.5 (b) 2 (c) 0.125 (d) 0.25
Correct Answer:
0.125
Explanation: […]
If both the resistance and the inductance in an LR AC series circuit are doubled the new impedance will be
Options
(a) halved (b) fourfold (c) doubled (d) quadrupled
Correct Answer:
doubled
Explanation:
For […]
A L-C-R circuit with L=1.00 mH, C=10μF and R=50Ω, is driven with 5 V AC voltage. At resonance, the current through the circuit is
Options
(a) 0.2 A (b) 0.25 A (c) 0.15 […]
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