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BECE Science 2024 Paper

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Question : 31

Total: 40

An electrical engineer was in your school to replace a 20 W bulb with a 50 W bulb.

Use this information to answer the question below

The 50 W bulb is likely to

I. increase the brightness in the room.

II. increase the amount of electricity consumed.

III. destroy the habitat of pests.

I, II and III
I and III only
II and III only
I and II only

Solution:

Concept:

The wattage of a bulb tells how much electrical power it uses; a higher wattage gives more light but also consumes more electricity.

Explanation:

A

50\,\mathrm{W}

bulb has a higher power rating than a

20\,\mathrm{W}

bulb.

So it converts more electrical energy into light and heat every second.

Because it produces more light, the brightness in the room increases, so statement I is correct.

Since it draws more power, the amount of electricity consumed over the same time also increases, so statement II is correct.

A bulb's wattage has no relation to destroying the habitat of pests, so statement III is not correct.

Hence, only statements I and II are the likely effects of replacing the bulb.

Answer:

D. I and II only

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