wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

A metallic tape gives correct value at 25C. A piece of wood is being measured by this metallic tape at 10C. The reading is 30 cm on the tape. Then, the real length of the wooden piece must be

A
30 cm
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
>30 cm
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
<30 cm
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
Data is not sufficient
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C <30 cm
Given that,
Metallic tape gives correct value at 25C.
At 10C, the length of the metallic tape is 30 cm.
From the concept of linear expansion, we know that
Change in length of the tape with change in temperature ΔT
=ΔL=L0(αΔT)
As the temperature decreases, tape will decrease in its length.
So, the reading 30 cm measured on the tape is lesser than the actual length of the wooden piece.
Hence, option (c) is the correct answer.

flag
Suggest Corrections
thumbs-up
13
Join BYJU'S Learning Program
Join BYJU'S Learning Program
CrossIcon