Physics
Assertion (A) : Lightning is a natural example of static electricity.
Reason (R) : Lightning occurs due to the accumulation of same charges in clouds and earth's surface.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- Assertion is true but reason is false
- Assertion is false but reason is true
Answer
Assertion is true but reason is false
Explanation
Lightning indeed represents a large-scale electrostatic discharge, so the Assertion is correct.
However, it is produced by the build-up of opposite charges—typically negative charges in the lower part of a cloud and positive charges on Earth’s surface or in another cloud—not by the build-up of like charges. Therefore the Reason is incorrect.
Related Questions
Assertion (A) : A fuse is used in an electrical appliance to safeguard from electric shocks.
Reason (R) : A fuse melts and breaks the circuit when excessive current flows through it.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- Assertion is true but reason is false
- Assertion is false but reason is true
Assertion (A) : MCB is more effective than a fuse in household wiring.
Reason (R) : MCB can be reset (raised up) after tripping whereas fuse must be neglected once blown.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- Assertion is true but reason is false
- Assertion is false but reason is true
Assertion (A) : Conductors can be charged by friction.
Reason (R) : Conductors allow charges to flow through them and do not retain static charges.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- Assertion is true but reason is false
- Assertion is false but reason is true
Fill in the blanks:
(a) Like charges …………… while unlike charges …………… .
(b) Mercury is a …………… of electricity while pure water is …………… of electricity.
(c) An ebonite rod when rubbed with fur acquires the …………… charge.
(d) When an uncharged conductor is brought in contact with the disc of a gold leaf electroscope, its leaves …………… .
(e) Charge is shared in charging a conductor by the method of …………… .