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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A certain charge liberates 0.8 gm of
. The same charge will liberate how many gm of silver
|
(a) 108 gm |
(b) 10.8 gm |
(c) 0.8 gm |
(d) |
A condenser having a capacity of 6mF is charged to 100 V and is then joined to an uncharged condenser of 14 μF and then removed. The ratio of the charges on 6mF and 14mF and the potential of 6mF will be
|
(a) |
(b) |
(c) |
(d) |
The core of a transformer is laminated to reduce energy losses due to
|
(a) Eddy currents |
(b) Hysteresis |
|
(c) Resistance in winding |
(d) None of these |
An electric kettle has two heating coils. When one coil is used, water in the kettle boils in 5 minutes, while when second coil is used, same water boils in 10 minutes. If the two coils, connected in parallel are used simultaneously, the same water will boil in time
|
(a) 3 min 20 sec |
(b) 5 min |
(c) 7 min 30 sec |
(d) 2 min 30 sec |
Assertion : The lightening conductor at the top of high building has sharp pointed ends.
Reason : The surface density of charge at sharp points is very high resulting in setting up of electric wind.
|
(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. |