Question

Statement 1: It is observed that sometimes a 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.

• A. Both the statements are true and statement 2 is the correct explanation of statement 1.
• B. Both the statements are true but statement 2 is not the correct explanation of statement 1.
• C. Statement 1 is correct and statement 2 is false
• D. Statement 1 is false and statement 2 is correct

Answer 1

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 completely and it glows brighter but it glows dimmer when less current flows through the wire.