Physics M.C.Q (1 Marks)

The resultant capacitance of given circuit is

A capacitor is kept connected to the battery and a dielectric slab is inserted between the plates. During this process(a) No work is done(b) Work is done at the cost of the energy already stored in the capacitor before the slab is inserted(c) Work is done at the cost of the battery(d) Work is done at the cost of both the capacitor and the battery

Two positive point charges of 12 μC  and 8 μC  are 10cm apart. The work done in bringing them 4 cm closer is (a) 5.8 J   (b) 5.8 eV(c) 13 J(d) 13 eV

Inside a hollow charged spherical conductor, the potential (a) Is constant(b) Varies directly as the distance from the centre(c) Varies inversely as the distance from the centre(d) Varies inversely as the square of the distance from the centre

Assertion :   If a point charge q is placed in front of an infinite grounded conducting plane surface, the point charge will experience a force.
Reason     : This force is due to the induced charge on the conducting surface which is at zero potential.(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.

Assertion :   Charge is quantized
Reason    : Charge, which is less than 1 C is not possible(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.

Assertion :   The capacity of a given conductor remains same even if charge is varied on it.
Reason      : Capacitance depends upon nearly medium as well as size and shape of conductor.(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.

Assertion  :   When charges are shared between any two bodies, no charge is really lost, but some loss of energy does occur.
Reason      : Some energy disappears in the form of heat, sparking etc.(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.

Assertion  :   Dielectric breakdown occurs under the influence of an intense light beam.
Reason      : Electromagnetic radiations exert pressure.(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.

Assertion  :   If a proton and an electron are placed in the same uniform electric field. They experience different acceleration.
Reason     : Electric force on a test charge is independent of its mass.(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.

Assertion  :   Electric lines of force cross each other.
Reason      : Electric field at a point superimpose to give one resultant electric field.(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 assertion is false but reason is true.

Assertion   :   A metallic shield in form of a hollow shell may be built to block an electric field.
Reason       : In a hollow spherical shield, the electric field inside it is zero at every point. (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 plates of a capacitor are charged to a potential difference of 320 volts and are then connected across a resistor. The potential difference across the capacitor decays exponentially with time. After 1 second  the potential difference between the plates of the capacitor is 240 volts, then after 2 and 3 seconds the potential difference between the plates will be(a) 200 and 180 V(b) 180 and 135 V(c) 160 and 80 V(d) 140 and 20 V

Assertion   :   Charge is invariant.
Reason      : Charge does not depends on speed of frame of reference.(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.