Which radiation in sunlight, causes heating effect
|
(a) Ultraviolet |
(b) Infrared |
(c) Visible light |
(d) All of these |
Which radiation in sunlight, causes heating effect
|
(a) Ultraviolet |
(b) Infrared |
(c) Visible light |
(d) All of these |
(b) Infrared
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Three bulbs of 40 W, 60 W, 100 W are arranged in series with 220 volt supply which bulb has minimum resistance
|
(a) 100 W |
(b) 40 W |
(c) 60 W |
(d) Equal in all bulbs |
Certain radio-active substance reduces to 25% of its value in 16 days. Its half-life is
|
(a) 32 days |
(b) 8 days |
(c) 64 days |
(d) 28 days |
A step up transformer has transformation ration 5 : 3. What is voltage in secondary if voltage in primary is 60 V
|
(a) 20 V |
(b) 60 V |
(c) 100 V |
(d) 180 V |
A condenser of capacity 50μF is charged to 10 volts. Its energy is equal to
|
(a) 2.5 |
(b) 2.5 |
(c) 5 |
(d) 1.2 |
The work done in bringing a 20 coulomb charge from point A to point B for distance 0.2m is 2J. The potential difference between the two points will be (in volt)
|
(a) 0.2 |
(b) 8 |
(c) 0.1 |
(d) 0.4 |