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Iron, lead and brass spheres of equal ma...

Iron, lead and brass spheres of equal masses are heated to a common temperature and arc kept on a sheet of wax. The sphere that passes through the plate first is (lead 0.03 cal/g`//^(@)`C, iron 0.11 ca1/`g//^(@)`C, brass 0.08 cal/g/`""^(@)C` )

A

lead

B

brass

C

iron

D

all at the same time

Text Solution

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The correct Answer is:
C
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An iron ball of diameter 6cm and is 0.01 mm too large to pass through a hole in a brass plate when the ball and plate are at a temperature of 20^(@) C . The temperature at which (both for ball and plate) the ball just pass through the hole is (alpha_("iron") = 12 xx 10^(-6) //1^(@) C, alpha_("brass") = 18 xx 10^(-6) //1^(@) C)