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UPSC Civil Service Exam Questions

Q1:

Consider the following statements :
I: To insert a 28 mm nominal diameter rivet, 29.5 mm rivet hole is made.
II: Provision is made to allow temperature expansion of the bolt.

A both I and II are true

B I is true but II is false

C I is false but II is true

D both I and II are false

ANS:C - I is false but II is true

The principle of thermal expansion is used in fixing the iron rims with the wooden wheel firmly.
Rivets are used to hold steel plates together very tightly. A very hot rivet is pushed through the two plates and its end is hammered over.
When the rivets cool down it pulls the two plates together very tightly.



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