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Class 10 Exam  >  Class 10 Tests  >  Science Class 10  >  Assertion & Reason Test: Electricity - Class 10 MCQ

Assertion & Reason Test: Electricity - Class 10 MCQ


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11 Questions MCQ Test Science Class 10 - Assertion & Reason Test: Electricity

Assertion & Reason Test: Electricity for Class 10 2025 is part of Science Class 10 preparation. The Assertion & Reason Test: Electricity questions and answers have been prepared according to the Class 10 exam syllabus.The Assertion & Reason Test: Electricity MCQs are made for Class 10 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion & Reason Test: Electricity below.
Solutions of Assertion & Reason Test: Electricity questions in English are available as part of our Science Class 10 for Class 10 & Assertion & Reason Test: Electricity solutions in Hindi for Science Class 10 course. Download more important topics, notes, lectures and mock test series for Class 10 Exam by signing up for free. Attempt Assertion & Reason Test: Electricity | 11 questions in 30 minutes | Mock test for Class 10 preparation | Free important questions MCQ to study Science Class 10 for Class 10 Exam | Download free PDF with solutions
Assertion & Reason Test: Electricity - Question 1
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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 : Silver is not used to make electric wires.

Reason : Silver is a bad conductor.

Detailed Solution for Assertion & Reason Test: Electricity - Question 1

- Assertion (A) states that "Silver is not used to make electric wires," which is true because silver is rarely used for this purpose due to its high cost.
- Reason (R) claims "Silver is a bad conductor," which is false; in fact, silver is the best conductor of electricity.
- Therefore, the correct choice is option 3: Assertion (A) is true but reason (R) is false.

Assertion & Reason Test: Electricity - Question 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 resistances are connected end- to-end consecutively, they are said to be in series.

Reason : In case the total resistance is to be increased, then the individual resistances are connected in series.

Detailed Solution for Assertion & Reason Test: Electricity - Question 2

  • Current in a circuit depends on resistance as well as Potential Difference of the circuit.

  • It is necessary to combine two or more resistances to get the required current in the electrical circuits

  • Resistances can be combined in two ways: in series and in parallel.

  • When two or more resistances are connected end to end consecutively, they are said to be connected in series.

  • And on the other hand, when two or more resistances are connected between the same two points, they are said to be connected in parallel.

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Assertion & Reason Test: Electricity - Question 3
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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: Tungsten metal is used for making filaments of incandescent lamps.

Reason : The melting point of tungsten is very low.

Detailed Solution for Assertion & Reason Test: Electricity - Question 3
Tungsten is selected for making filaments of incandescent lamp bulbs because tungsten can sustain high temperature and it has a high melting point, with high resistivity.
Assertion & Reason Test: Electricity - Question 4
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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 : Alloys are commonly used in electrical heating devices, like electrical iron, toasters etc.

Reason : Alloys do not oxidise (burn) readily at high temperatures.
Detailed Solution for Assertion & Reason Test: Electricity - Question 4
An alloy generally has a higher resistivity than its constituent metals. Alloys do not oxidise (burn) readily at high temperatures. For this reason, they are commonly used in electrical heating devices, like electric iron, toasters etc.
Assertion & Reason Test: Electricity - Question 5
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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 resistances are connected between the same two points, they are said to be connected in parallel.

Reason : In case the resistance is to be decreased, then the individual resistances are connected in parallel.
Detailed Solution for Assertion & Reason Test: Electricity - Question 5
In parallel connection, all the elements are connected between the same two points hence the voltage drop across any number of resistors or other elements connected in parallel is the same.
Assertion & Reason Test: Electricity - Question 6
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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 : The electric bulbs glow immediately when the switch is on.

Reason : The drift velocity of electrons in a metallic wire is very high.
Detailed Solution for Assertion & Reason Test: Electricity - Question 6
In a conductor there are large numbers of free electrons. When we close the circuit, the electric field is established instantly with the speed of electromagnetic waves which causes electron drift at every portion of the circuit. Due to which the current is set up in the entire circuit instantly. The current which is set up does not wait for the electrons to flow from one end of the conductor to another end. Due to this, the bulb glows immediately when the switch is on.
Assertion & Reason Test: Electricity - Question 7
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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 : Insulators do not allow flow of current through themselves.

Reason : They have no free-charge carriers.
Detailed Solution for Assertion & Reason Test: Electricity - Question 7
Insulators are bad conductors because they don't have free charge carriers which will flow and hence the correct option becomes A.
Assertion & Reason Test: Electricity - Question 8
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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 : The equation V = RI does not apply to those conducting devices which do not obey Ohm’s law.

Reason : V= RI is mathematical representation of Ohm’s law.
Detailed Solution for Assertion & Reason Test: Electricity - Question 8

  • The assertion states that the equation  V = RI does not apply to devices not obeying Ohm's law. This is true because Ohm's law describes a linear relationship between voltage, current, and resistance.

  • The reason states that V = RI is the mathematical representation of Ohm's law. This is also true, as Ohm's law is represented by this equation.

  • While both statements are true, the reason does not directly explain why the equation doesn't apply to non-ohmic devices, making the correct choice B.
Assertion & Reason Test: Electricity - Question 9
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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 : Heater wire must have high resistance and high melting point.

Reason : If resistance is high, the electric conductivity will be less.
Detailed Solution for Assertion & Reason Test: Electricity - Question 9

Heater wire must have high resistance and high melting point because, according to Joule’s law (H = I²Rt), heat produced is high if resistance is high. The wire needs a high melting point to ensure it does not melt with the increase in temperature. While the reason states that high resistance results in lower conductivity, it does not explain why a high melting point is necessary for the operation of a heater wire.

Assertion & Reason Test: Electricity - Question 10
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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 : Bending a wire does not affect electrical resistance.

Reason : Resistance of wire is proportional to resistivity of material.
Detailed Solution for Assertion & Reason Test: Electricity - Question 10

Resistance of wire R =

Where p is resistivity of material which does not depend on the geometry of wire. Since when wire is bent, resistivity, length and area of cross-section do not change, therefore resistance of wire also remains same.

Assertion & Reason Test: Electricity - Question 11
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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 a graph is plotted between the potential difference and the current flowing, the graph is a straight line passing through the origin.

Reason : The current is directly proportional to the potential difference.
Detailed Solution for Assertion & Reason Test: Electricity - Question 11
According to Ohm's law, the potential difference across a conductor is directly proportional to the current through it.

V=IR

Hence the curve is a straight line passing through the origin.

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