# Electricity | Class 10 | Assertion and Reason

Question 1. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Tungsten metal is used for making filaments of bulb.
Reason (R): The melting point of tungsten is very low.

A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
Answer: C). A is true but R is false.
Question 2. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): If a graph is plotted between the potential difference and the current flowing, the graph is a straight line passing through the origin.
Reason (R): The current is directly proportional to the potential difference.

A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
Answer:A). Both A and R are true and R is the correct explanation of A.
Question 3. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Longer wires have greater resistance and the smaller wires have lesser resistance.
Reason (R): Resistance is inversely proportional to the length of the wire.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
Answer:C). A is true but R is false.
Question 4. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): The total resistance is to be decresed, then the individual resistances are connected in parallel combination.
Reason (R): The resiprocal of equivalent resistances for a parallel combination is sum of resiprocal of indivisual resistances.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
B). Both A and R are true but R is not the correct explanation of A.
Question 5. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): When two or more resistances are connected end-to-end consecutively, they are said to be in series combination.
Reason (R): The total resistance is to be increased, then the individual resistances are connected in series combination.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
B). Both A and R are true but R is not the correct explanation of A.
Question 6. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Alloys are commonly used in electrical heating appliances, like electrical iron, toasters etc.
Reason (R): Alloys do not oxidise (burn) readily at high temperatures.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
A). Both A and R are true and R is the correct explanation of A.
Question 7. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): A cell or battery is a device which converts chemical energy into electrical energy.
Reason (R): Cell or battery maintains a constant potential difference between its terminals for a long time.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
B). Both A and R are true but R is not the correct explanation of A.
Question 8. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): The resistivity of a substance does not depend on the nature of the substance and temperature.
Reason (R): The resistivity of a substance is a characteristic property of the material.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
D). A is false but R is true.
Question 9. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Tungsten metal is used for making filaments of incandescent lamps.
Reason (R): The melting point of tungsten is very low.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
C). A is true but R is false.
Question 10. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Domestic appliances are connected in parallel.
Reason (R): Each appliance get same amount of potential difference.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
A). Both A and R are true but R is the correct explanation of A.
Question 11. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): The fuse is placed in series with the device.
Reason (R): Fuse consists of a piece of wire made of a metal or an alloy of appropriate melting point.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
B). Both A and R are true but R is not the correct explanation of A.
Question 12. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): The fuse is placed in series with the device.
Reason (R): Equal amount of current passed through fuse when it is connected in series.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
A). Both A and R are true and R is the correct explanation of A.
Question 13. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): The coil of a heater is cut into two equal halves and only one of them is used into heater. The heater will now require half the time to produce the same amount of heat.
Reason (R): The heat produced is directly proportional to square of current.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
B). Both A and R are true but R is not the correct explanation of A.
Question 14. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Heat produced in heater is halved when the length of the coil is halved.
Reason (R): Heat produced by an conducyting coil is directly proportional to the resistance of the coil.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
A). Both A and R are true and R is the correct explanation of A.
Question 15. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): The wires supplying current to an electric heater are not heated appreciably.
Reason (R): Resistance of connecting wires is very small and H < R.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
A). Both A and R are true and R is the correct explanation of A.
Question 16. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): A current carrying wire should be charged.
Reason (R): The current in a wire is due to flow of free electrons in a definite direction.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
D). A is false but R is true.
Question 17. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Electron has a negative charge.
Reason (R): Electrons move always from a region of higher potential to a region of lower potential.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
C). A is true but R is false.
Question 18. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Heater wire must have high resistance and high melting point.
Reason (R): If resistance is high, the electric conductivity will be less.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
B). Both A and R are true but R is not the correct explanation of A.
Question 19. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): In a chain of bulbs, 50 bulbs are joined in series. One bulb is removed now and circuit is completed again. If the remaining 49 bulbs are again connected in series across the same supply, then light gets decreased in the room.
Reason (R): Net resistance of 49 bulbs will be less than 50 bulbs.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
D). A is false but R is true.
Question 20. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Fuse wire must have high resistance and low melting point.
Reason (R): Fuse is used for small current flow only.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
C). A is true but R is false.
Question 21. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): The connecting wires are made of copper.
Reason (R): The electrical conductivity of copper is high.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
A). Both A and R are true and R is the correct explanation of A.
Question 22. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Current is the rate of flow of charge.
Reason (R): Electric current will not flow between two charged bodies when connected, if they are at same potential.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
B). Both A and R are true but R is not the correct explanation of A.
Question 23. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): A bird perches on a high power line and nothing happens to the bird.
Reason (R): The circuit is incomplete for the bird sitting on high power line.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
A). Both A and R are true and R is the correct explanation of A.
Question 24. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): When a wire is stretched to three times of its length, its resistance becomes 9 times.
Reason (R): Resistance is directly proportional to length of wire.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
B). Both A and R are true but R is not the correct explanation of A.
Question 25. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): It is advantageous to transmit electric power at high voltage.
Reason (R): High voltage implies high current.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
C). A is true but R is false.
Question 26. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): It is advantageous to transmit electric power at high voltage and less current.
Reason (R): heat generation in wire is less due to less current.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
A). Both A and R are true and R is the correct explanation of A.
Question 27. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Bending a wire does not affect electrical resistance.
Reason (R): Resistance of a wire is proportional to resistivity of material.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
B). Both A and R are true but R is not the correct explanation of A.
Question 28. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): A voltmeter and ammeter can be used together to measure resistance but not power.
Reason (R): Power is proportional to voltage and current.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
A). D). A is false but R is true.
Question 29. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Ammeter is connted in series.
Reason (R): It gives the correct reading of current in circuit.
A). Both Assertion - A and Reason- R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason- R are true but R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason- R is false.
D). Assertion - A is false but Reason- Ris true.
A). Both A and R are true and R is the correct explanation of A.
Question 30. Directions : In the questions given below are two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Voltmeter is connected in parallel.
Reason (R): It does not draw any current itself (due to high resistance) and does not affect net resistance of the circuit.
A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.
A). Both A and R are true and R is the correct explanation of A.