Assertion & Reason Test: Electricity - 2
15 Questions MCQ Test Online MCQ Tests for Class 10 | Assertion & Reason Test: Electricity - 2
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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 : When the length of a wire is doubled, then its resistance also gets doubled.
Reason : The resistance of a wire is directly proportional to its length.
i.e. R ∝ l Since, the resistance of a wire is directly proportional to its length, i.e. when the length of a wire is doubled/ halved then its resistance also gets doubled/halved.
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 200 W bulbs glow with more brightness than 100 W bulbs.
Reason : A 100 W bulb has more resistance than a 200 W bulb.
R ∝ 1/p
i.e. Higher the wattage of a bulb, lesser is the resistance and so it will glow bright.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : Positive charge inside the cell always goes from the positive terminal to the negative terminal.
Reason : Positive charge inside the cell may go from negative terminal 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 : A voltmeter and ammeter can be used together to measure resistance but not power.
Reason : Power is proportional to voltage and current.
Power, P = VI We can measure both resistance and power by measuring the V and I simultaneously in circuit. So option (e) is correct.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : Electric appliances with metallic bodies have three connections, whereas an electric bulb has a two pin connection.
Reason : Three pin connections reduce heating of connecting wires.
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): The resistivity of the conductor increases with the increasing temperature.
Reason (R): 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 (A): A conductor has + 3.2 × 10–19 C charge.
Reason (R): Conductor has gained 2 electrons.
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): Two resistance having value R each. Their equivalent resistance is R / 2
Reason (R): Given Resistances are 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 (A): Bending a wire does not affect electrical resistance.
Reason (R): Resistance of wire is proportional to resistivity of material.
R = 
Where r is resistivity of material which does not depend on the geometry of wire. Since when wire is bent its resistivity, length and area of cross section do not change, therefore resistance of wire also remains same.
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): Silver is not used to make electric wires.
Reason (R): Silver is a bad 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 (A): The electric bulbs glow immediately when the switch is ON.
Reason (R): The drift velocity of electrons in a metallic wire is very 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): In a simple battery circuit the point of lowest potential is the positive terminal of the battery.
Reason (R): The current flows towards the point of the lower potential as it flows in such a circuit from the positive to the negative 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 (A): Alloys are commonly used in electrical heating devices like electric iron and heater.
Reason (R): Resistivity of an alloy is generally higher than that of its constituent metals but the alloys have low melting points then their constituent metals.
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): Copper is used to make electric wires.
Reason (R): Copper has very low electrical resistance.
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): Electric appliances with a metallic body have three connections, whereas an electric bulb has a two pin connection.
Reason (R): Three pin connections reduce heating of connecting wires.
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