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 connecting wires are made of copper.
Reason : The electrical conductivity of copper is high.
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 conductor has +3.2 X 10-19C charge.
Reason : Conductor has gained 2 electrons.
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Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : If p1 and p2 be the resistivity of the materials of two resistors of resistances R1 and R2 respectively and R1 > R2
Reason : The resistance R = pl/A ⇒ p1> p2 if R1 > R2
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.
461 tests
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