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

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

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## 19 Questions MCQ Test Science Class 10 - Assertion & Reason Test: Electricity - 3

Assertion & Reason Test: Electricity - 3 for Class 10 2024 is part of Science Class 10 preparation. The Assertion & Reason Test: Electricity - 3 questions and answers have been prepared according to the Class 10 exam syllabus.The Assertion & Reason Test: Electricity - 3 MCQs are made for Class 10 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion & Reason Test: Electricity - 3 below.
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Assertion & Reason Test: Electricity - 3 - Question 1

### 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.

Detailed Solution for Assertion & Reason Test: Electricity - 3 - Question 1
Copper conducts the current without offering much resistance due to high electrical conductivity.
Assertion & Reason Test: Electricity - 3 - Question 2

### 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.

Detailed Solution for Assertion & Reason Test: Electricity - 3 - Question 2
Conductor has positive charge, so it has lost two electrons.
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Assertion & Reason Test: Electricity - 3 - Question 3

### 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 > R2Reason : The resistance R = pl/A ⇒ p1> p2 if R1 > R2

Detailed Solution for Assertion & Reason Test: Electricity - 3 - Question 3
p is the characteristic of. the material of resistors. It does not depend on the length and cross-sectional area of resistors. But R depends on the length and the cross-sectional area of the resistor. So, R1 may be greater than R2 even when pi ≤ p 2.
Assertion & Reason Test: Electricity - 3 - Question 4

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.

Detailed Solution for Assertion & Reason Test: Electricity - 3 - Question 4
Resistivity is a material property. And Resistance is inversely proportional to the cross section area of the wire. So, thinner the wire, higher the resistance.
Assertion & Reason Test: Electricity - 3 - Question 5

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.

Detailed Solution for Assertion & Reason Test: Electricity - 3 - Question 5
Here voltmeter is connected in series in the circuit. And it has a high input impedance hence the circuit is behaving like an open circuit. So no current is flowing in the circuit and the ammeter is showing zero. But voltmeter will show the emf of the battery, i.e. E.
Assertion & Reason Test: Electricity - 3 - Question 6

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.

Detailed Solution for Assertion & Reason Test: Electricity - 3 - Question 6
The resistivity of the conductors is directly proportional to temperature.
Assertion & Reason Test: Electricity - 3 - Question 7

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.

Detailed Solution for Assertion & Reason Test: Electricity - 3 - Question 7

(Same rated voltage)

Assertion & Reason Test: Electricity - 3 - Question 8

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.

Detailed Solution for Assertion & Reason Test: Electricity - 3 - Question 8
When two resistance R1 and P2 connected in parallel than their equivalent resistance will be
Assertion & Reason Test: Electricity - 3 - Question 9

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.

Detailed Solution for Assertion & Reason Test: Electricity - 3 - Question 9
Kirchoff’s loop rule follows from conservation of energy.
Assertion & Reason Test: Electricity - 3 - Question 10

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.

Assertion & Reason Test: Electricity - 3 - Question 11

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.

Detailed Solution for Assertion & Reason Test: Electricity - 3 - Question 11

Conductivity = 1 / Resistivity

Conductivity X resistivity = 1

Assertion & Reason Test: Electricity - 3 - Question 12

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.

Detailed Solution for Assertion & Reason Test: Electricity - 3 - Question 12
Glow = Power

Assertion & Reason Test: Electricity - 3 - Question 13

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.

Detailed Solution for Assertion & Reason Test: Electricity - 3 - Question 13
In tube light the majority portion of radiation comes under visible region while bulb radiation consists of visible, ultraviolet, infrared radiation giving less visible part.
Assertion & Reason Test: Electricity - 3 - Question 14

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.

Detailed Solution for Assertion & Reason Test: Electricity - 3 - Question 14

It is quite clear that in a battery circuit, the point of lowest potential is the negative terminal of the battery and the current flows from higher potential to lower potential.

Assertion & Reason Test: Electricity - 3 - Question 15

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.

Assertion & Reason Test: Electricity - 3 - Question 16

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.

Detailed Solution for Assertion & Reason Test: Electricity - 3 - Question 16
The bulbs are filled with chemically inactive gases. Nitrogen and oxygen gases are inactive and are filled in order to prolong the life of filament The torch bulbs are operated on heating effect if same voltage DC or same AC rms voltage is applied produces the same heating effect irrespective of the direction of current.
Assertion & Reason Test: Electricity - 3 - Question 17

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.

Detailed Solution for Assertion & Reason Test: Electricity - 3 - Question 17
Here,

P = so P ∝ R only when I is constant.

Here I increase as R is decreased. Hence the reason is wrong.

Assertion & Reason Test: Electricity - 3 - Question 18

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.

Detailed Solution for Assertion & Reason Test: Electricity - 3 - Question 18

The equation shows that resistivity varies with temperature.

Assertion & Reason Test: Electricity - 3 - Question 19

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.

Detailed Solution for Assertion & Reason Test: Electricity - 3 - Question 19
A low electrical resistance of copper makes it a good electric conductor. So, it is used to make electric wires.

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