For what value of unknown resistance X, the potential difference between B and D will be zero in the circuit shown in the figure
|
(a) 4 W |
(b) 6 W |
(c) 2 W |
(d) 5 W |
(b) 6 W
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Which one of the following is the weakest kind of bonding in solids
|
(a) Ionic |
(b) Metallic |
(c) Vander Waals |
(d) Covalent |
Function of rectifier is
|
(a) To convert ac into dc |
(b) To convert dc into ac |
|
(c) Both (a) and (b) |
(d) None of these |
The total charge induced in a conducting loop when it is moved in magnetic field depends on
|
(a) The rate of change of magnetic flux |
(b) Initial magnetic flux only |
|
(c) The total change in magnetic flux |
(d) Final magnetic flux only |
Atomic weight of boron is 10.81 and it has two isotopes 
and 
. Then ratio of 
in nature would be
|
(a) 19 : 81 |
(b) 10 : 11 |
(c) 15 : 16 |
(d) 81 : 19 |
Assertion : The speed of light in a rarer medium is greater than that in a denser medium
Reason : One light year equals to 9.5 × 1012 km
|
(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. |
In the circuit shown in figure, the current drawn from the battery is 4A. If 10 W resistor is replaced by 20 W resistor, then current drawn from the circuit will be
|
(a) 1 A |
(b) 2 A |
(c) 3 A |
(d) 0 A |