- ACharge on sphere A will be more
- BCharge on sphere B will be more
- ✓Both will have equal charge
- DCannot be said with certainty.
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The resistance of an ideal ammeter is
|
(a) Infinite |
(b) Very high |
(c) Small |
(d) Zero |
An electric bulb is rated 220 volt and 100 watt. Power consumed by it when operated on 110 volt is
|
(a) 50 watt |
(b) 75 watt |
(c) 90 watt |
(d) 25 watt |
Two thin lenses, one of focal length + 60 cm and the other of focal length – 20 cm are put in contact. The combined focal length is
|
(a) + 15 cm |
(b) – 15 cm |
(c) + 30 cm |
(d) –30 cm |
The neutron was discovered by
|
(a) Marie Curie |
(b) Pierre Curie |
(c) James Chadwick |
(d) Rutherford |
With a change of load resistance of a triode, used as an amplifier, from 50 kilo ohms to 100 kilo ohms, its voltage amplification changes from 25 to 30. Plate resistance of the triode is
|
(a) 25 kW |
(b) 75 kW |
(c) 7.5 kW |
(d) 2.5 kW |
In a coil of self inductance 0.5 henry, the current varies at a constant rate from zero to 10 amperes in 2 seconds. The e.m.f. generated in the coil is
|
(a) 10 volts |
(b) 5 volts |
(c) 2.5 volts |
(d) 1.25 volts |