It takes 4 minutes to boil a quantity of water electrically. How long will it...

WAEC 1988

It takes 4 minutes to boil a quantity of water electrically. How long will it take to boil same quantity of water using the same heating coil but with the current doubled? (neglecting any external heat loss).

A. 64 minutes
B. 32 minutes
C. 8 minutes
D. 2 minutes
E. 1 minute

JAMB CBT 2025 - Candidates, Schools, Centres, Resellers - Get Ready!

JAMB CBT Mobile App 2025 - Free Download

WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 127076

Correct Answer: Option E

Explanation

D ∝ l²
E will increase 4 times when current is doubled.
Therefore time will decrease by a factor of 4, which is 1 minute.

Previous Next

Go back to Phy classroom

Report an Error Ask A Question Download App

Contributions ({{ comment_count }})

Please wait...

{{ settings.no_comment_msg ? settings.no_comment_msg : 'There are no comments' }}

Quick Questions

how many questions is jamb for science class? Answer this

2 Answers · Biology · 10 hours ago
How can I get to know figure of speech off head? Answer this

2 Answers · Literature in English · 11 hours ago
The question that can come to you doing the jamp? Answer this

1 Answers · Literature in English · 6 hours ago

It takes 4 minutes to boil a quantity of water electrically. How long will it...

Correct Answer: Option E

Explanation

Contributions ({{ comment_count }})

Please wait...

Modal title

Report

Block User

{{ feedback_modal_data.title }}

Quick Questions

Post your Contribution

Sign In