Assertion & Reason Test: Electricity - 3 - Class 10 MCQ

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Wire A is thin in comparison to wire B of same material same length then resistance of wire A is greater than resistance of wire B.

Reason: Resistivity of wire A is greater than resistance of wire B.

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : All electric devices shown in the circuit are ideal. The reading of each ammeter (a) and voltmeter (V) is zero.

Reason : An ideal voltmeter draws almost no current due to very large resistance, and hence (V) and (a) will read zero.

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : The resistivity of the conductor increases with the increasing temperature.

Reason : The resistivity is the reciprocal of the conductivity.

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Resistance of 50 W bulb is greater than that of 100 W.

Reason : Resistance of bulb is inversely proportional to rated power.

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Two resistance having value R each. Their equivalent resistance is R/2.

Reason : Given Resistance is connected in parallel.

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Kirchoff’s rule follows from conservation of charge.

Reason : Kirchoff’s loop rule follows from conservation of momentum.

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Longer wires have greater resistance and the smaller wires have lesser resistance.

Reason : Resistance is inversely proportional to the length of the wire.

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion: The product of resistivity and conductivity of a conductor depends on the material of the conductor.

Reason : Because each resistivity and conductivity depends on the material of the conductor.

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : When current through a bulb decreases by 0.5% the glow of the bulb decreases by 1%.

Reason : Glow (Power) which is directly proportional to square of current.

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : 40 W tube light gives more light in comparison to 40 w bulb.

Reason : Light produced is the same from the same power.

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : In a simple battery circuit the point of lowest potential is the positive terminal of the battery.

Reason : The current flows towards the point of the lower potential as it flows in such a circuit from the negative to the positive terminal.

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : The value of the current in the ammeter is the same, independent of its position in the electric circuit.

Reason : In a series combination of resistors the current is the same in every part of the circuit or the same current through each resistor.

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : A torch bulb gives light if operated on AC of the same voltage and current as DC.

Reason : Heating effect is common to both AC and DC.

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : A resistor of resistance R is connected to an ideal battery. If the value of R is decreased, the power dissipated in the circuit will increase.

Reason : The power dissipated in the circuit is directly proportional to the resistance of the circuit.

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Resistivity of material may-change with temperature.

Reason : Resistivity is a material property & independent of temperature.

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Copper is used to make electric wires.

Reason : Copper has very low electrical resistance.