- Aonly on the length of the conductor
- Bonly on the area of cross-section of the conductor
- Conly on the substance of the conductor
- ✓on all of the above
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
When ultraviolet rays are incident on metal plate, then photoelectric effect does not occurs. It occurs by the incidence of
|
(a) X-rays |
(b) Radio wave |
(c) Infrared rays |
(d) Green house effect |
Assertion : If different gases are filled turn by turn at the same pressure in the discharge tube the discharge in them takes place at the same potential.
Reason : The discharge depends only on the pressure of discharge tube and not on the ionisation potential of gas.
|
(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. |
The current flowing through a lamp marked as 50 W and 250 V is
|
(a) 5 amp |
(b) 2.5 amp |
(c) 2 amp |
(d) 0.2 amp |
A 100 watt bulb working on 200 volt and a 200 watt bulb working on 100 volt have
|
(a) Resistances in the ratio of 4 : 1 |
|
(b) Maximum current ratings in the ratio of 1 : 4 |
|
(c) Resistances in the ratio of 2 : 1 |
|
(d) Maximum current ratings in the ratio of 1 : 2 |
