For measurement of potential difference, potentiometer is preferred in comparison to voltmeter because
|
(a) Potentiometer is more sensitive than voltmeter |
|
(b) The resistance of potentiometer is less than voltmeter |
|
(c) Potentiometer is cheaper than voltmeter |
|
(d) Potentiometer does not take current from the circuit |
(d) Potentiometer does not take current from the circuit
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A charge +Q is moving upwards vertically. It enters a magnetic field directed to the north. The force on the charge will be towards
|
(a) North |
(b) South |
(c) East |
(d) West |
For germanium crystal, the forbidden energy gap in joules is
|
(a) 1.12 |
(b) 1.76 |
(c) 1.6 |
(d) Zero |
Two capacitors connected in parallel having the capacities 
and 
are given ‘q’ charge, which is distributed among them. The ratio of the charge on and will be
|
(a) |
(b) |
(c) |
(d) |
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 |
A movie projector forms an image 3.5m long of an object 35 mm. Supposing there is negligible absorption of light by aperture then illuminance on slide and screen will be in the ratio of
|
(a) 100 : 1 |
(b) 104 : 1 |
(c) 1 : 100 |
(d) 1 : 104 |
The direction of magnetic lines of forces close to a straight conductor carrying current will be
|
(a) Along the length of the conductor |
|
(a) Along the length of the conductor |
|
(c) Circular in a plane perpendicular to the conductor |
|
(d) Helical |
