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Subject :NSO    Class : Class 7

When you put a metal key into its metal lock, you find the key is too tight. Which of the following methods will you adopt to make the key fit properly?

A Heating the key and lock both
B Cooling the key and heating the lock
C Heating the key and cooling the lock
D Cooling the key and lock both

on heating metal contracts and on cooling metal expands

Ans 1:

Class : Class 8
it has to be b

Ans 2:

Class : Class 7
It's B I am sure

Ans 3:

Class : Class 7
yep it should be B . check your description its wrong . metal expands on heating and vice versa. plz help me with my questions too

Ans 4:

Class : Class 8
You got the point vice versa. It has to be (B)

Ans 5:

Class : Class 7

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