Statement 1: It is observed that sometimes an incandescent bulb glows brighter and sometimes it glows dim.

Statement 2: Glowing brighter and dimmer depends on heating effect of current. More current produces more heating effect making the bulb glow brighter and vice-versa.

Both the statements are true and statement 2 is the correct explanation of statement 1.

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Both the statements are true but statement 2 is not the correct explanation of statement 1.

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Statement 1 is correct and statement 2 is false.

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Statement 1 is false and statement 2 is correct.

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Solution

The correct option is A
Both the statements are true and statement 2 is the correct explanation of statement 1.

More current produces more heating effect and hence the filament heats up more and it glows brighter but it glows dimmer when less current flows through the wire.

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Similar questions

Statement 1: It is observed that sometimes an incandescent bulb glows brighter and sometimes it glows dim.

Statement 2: Glowing brighter and dimmer depends on heating effect of current. More current produces more heating effect making the bulb glow brighter and vice-versa.

Q. Assertion :Bulb C glows brighter than bulb A Reason: The current through bulb C is more than the current through bulb A

Q. If the normal filament in a bulb is replaced with a thicker one, what will happen?
(i) Will melt quickly
(ii) Can withstand more current
(iii) Will glow brighter
(iv) Will glow dimmer

Q. A light bulb sometimes glows brightly and sometimes dim. Why?

Q. Study the circuit given below.
figure

If a second cell is connected in series with the first cell, what would happen to bulbs 1 and 2?
(a) They will continue to glow as before.
(b) Bulb 1 will glow brighter as it is closer to the cell.
(c) Bulb 2 will become dimmer.
(d) Both will glow brighter than before.

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Statement 1: It is observed that sometimes an incandescent bulb glows brighter and sometimes it glows dim. Statement 2: Glowing brighter and dimmer depends on heating effect of current. More current produces more heating effect making the bulb glow brighter and vice-versa.

The correct option is A Both the statements are true and statement 2 is the correct explanation of statement 1. More current produces more heating effect and hence the filament heats up more and it glows brighter but it glows dimmer when less current flows through the wire.

Statement 1: It is observed that sometimes an incandescent bulb glows brighter and sometimes it glows dim.

Statement 2: Glowing brighter and dimmer depends on heating effect of current. More current produces more heating effect making the bulb glow brighter and vice-versa.

The correct option is A
Both the statements are true and statement 2 is the correct explanation of statement 1.

More current produces more heating effect and hence the filament heats up more and it glows brighter but it glows dimmer when less current flows through the wire.