1 )
The coefficient of linear expansion of iron is 0.000011 per K . An iron rod is
10 m long at 27 C . The length of rod will decreased by 1.1 mm , when the temperature
of rod changes to : -
A ) 11
C ,
B
) 17 C ,
C ) 91
C ,
D
) None of these ,
Correct
Answer : - B ) 17 C ,
Solution
: -
∆ L = L˳ α ∆ t
,
So , ∆ t = ∆
L /
L˳ α ,
∆ t = ( 1.1 x 10 ^ ( - 3 )) / (
1.1 x 10 ^ ( - 6 ) x 10 ) ,
∆ t = 10 .
So ,
T =
27 – 10 = 17 C , Answer .
. .
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2 )
The length of a spring α when a force of 4 N is applied on it and the length is
β when 5 N is applied . The length of spring when 9 N force is applied is ?
Solution : -
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