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Physics -- Heat and Thermodynamics
1.
Two holes of unequal diameters d1 and d2 (d1 > d2) are cut in a metal sheet. If the sheet is heated,
- A.both d1 and d2 will decrease
- B.both d1 and d2 will increase
- C.d1 will increase, d2 will decrease
- D.d1 will decrease, d2 will increase
- Answer
- Report
Answer : [B]
2.
In the previous question, the distance between the holes will
- A.increase
- B.decrease
- C.remain constant
- D.may either increase or decrease depending on the positions of the holes on the sheet and on the ratio d1/d2.
- Answer
- Report
Answer : [A]
3.
A metal wire of length l and area of cross-section A is fixed
between rigid supports at negligible tension. If this is cooled, the
tension in the wire will be
- A.proportional to l
- B.inversely proportional to l
- C.independent of l
- D.independent of A
- Answer
- Report
Answer : [C]
4.
A horizontal tube, open at both ends, contains a column of
liquid. The length of this liquid column does not change with
temperature. Let γ = coefficient of volume expansion of the liquid
and α = coefficient of linear expansion of the material of the tube.
- A.γ = α
- B.γ = 2α
- C.γ = 3α
- D.γ = 0
- Answer
- Report
Answer : [B]
5.
A solid with coefficient of linear expansion α just floats in a liquid whose coefficient of volume expansion is γ. If the system is heated, the solid will
- A.sink in all cases
- B.continue to float in all cases
- C.sink if γ > 3α
- D.sink if γ < 3α
- Answer
- Report
Answer : [C]
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