For a given surface the Gauss's law is stated as 
From this we can conclude that
|
(a) E is necessarily zero on the surface |
|
(b) E is perpendicular to the surface at every point |
|
(c) The total flux through the surface is zero |
|
(d) The flux is only going out of the surface |
(c) The total flux through the surface is zero
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The V-i graphs A and B drawn for two voltameters. Identify each graph
|
(a) A for water voltameter and B for Cu voltameter |
|
(b) A for Cu voltameter and B for water voltameter |
|
(c) Both A and B represents Cu voltameter |
|
(d) None of these |
The distance between the plates of a parallel plate condenser is 4mm and potential difference is 60 volts. If the distance between the plates is increased to 12mm, then
|
(a) The potential difference of the condenser will become 180 volts |
|
(b) The P.D. will become 20 volts |
|
(c) The P.D. will remain unchanged |
|
(d) The charge on condenser will reduce to one third |
Assertion : In a simple battery circuit the point of lowest potential is positive terminal of the battery
Reason : The current flows towards the point of the higher potential as it flows in such a circuit from the negative to the positive terminal.
|
(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. |
A 10 μF capacitor is charged to a potential difference of 50 V and is connected to another uncharged capacitor in parallel. Now the common potential difference becomes 20 volt. The capacitance of second capacitor is
|
(a) 10 μF |
(b) 20 μF |
(c) 30 μF |
(d) 15 μF |
Two capacitors A and B are connected in series with a battery as shown in the figure. When the switch S is closed and the two capacitors get charged fully, then
|
(a) The potential difference across the plates of A is 4V and across the plates of B is 6V |
|
(b) The potential difference across the plates of A is 6V and across the plates of B is 4V |
|
(c) The ratio of electrical energies stored in A and B is 2 : 3 |
|
(d) The ratio of charges on A and B is 3 : 2 |
Two parallel plates separated by a distance of 5mm are kept at a potential difference of 50 V. A particle of mass 
and charge 
enters in it with a velocity 
. The acceleration of the particle will be
|
(a) |
(b) |
(c) |
(d) 2 |
In the depletion region of an unbiased P-N junction diode there are
| (a) Only electrons | (b) Only holes |
| (c) Both electrons and holes | (d) Only fixed ions |
