Electricity Magnetic and Heating Effects Class 8 Assertion and Reason Questions

Electricity Magnetic and Heating Effects Class 8 Assertion and Reason Questions

Electricity Magnetic and Heating Effects Class 8 Assertion and Reason Questions

Following questions are of Assertion (A), Reason (R) type questions. Choose the correct answer from the following options:

(a) Both A and R are true, and R is the correct explanation of A.

(b) Both A and R are true, but R is not the correct explanation of A.

(c) A is true, but R is false.

(d) A is false, but R is true.

1. (A): An electric current flowing through a conductor produces a magnetic field around it.

(R): The magnetic field is produced only when the current is alternating.

Answer:

(c) A is true, but R is false.

2. (A): Nichrome wire is commonly used in heating devices because it is a good conductor of electricity.

(R): Nichrome wire generates more heat for a given current compared to copper.

Answer:

(b) Both A and R are true, but R is not the correct explanation of A.

3. (A): A current-carrying coil can behave like a magnet.

(R): The strength of the magnetic field produced by the coil increases with the number of turns of wire in the coil.

Answer:

(a) Both A and R are true, and R is the correct explanation of A.

4. (A): Electric heating devices are more convenient than traditional heating methods.

(R): Electric heating devices do not produce smoke or require fuel like wood or charcoal.

Answer:

(a) Both A and R are true, and R is the correct explanation of A.

5. (A): An electromagnet can lift heavier objects than a permanent magnet.

(R): The strength of an electromagnet can be increased by adjusting the current flowing through it.

Answer:

(a) Both A and R are true, and R is the correct explanation of A.