Physics - Heat and Thermodynamics

Question - 1

Choose the  INCORRECT statement :

  • A If the thermal capacity of a body is 40 cals, its water equivalent is 40 g.
  • B Temperature at the bottom of froxen lake is 4\(?\)
  • C Water expands when heated from 0\(?\) to 4\(?\).
  • D Specific heat of water is highest

Question - 2

A glass tumbler has a cavity of air of 1 cm3 at 20\(?\). The coefficient of linear expansion of glass is 1 \(\times\) 10-5 per \(?\) and the coefficient of volume expansion of air is 4 \(\times\) 10-3 per \(?\). At 30\(?\) the fractional increase in volume of the cavity will be

  • A 3 \(\times\) 10-4
  • B 0.04
  • C 1\(\times\) 10-4
  • D 0.012

Question - 3

What does increase with temperature?

A. Time period of a pendulum

B. Coefficient of Viscosity

C. Wavelength of sound

D. Viscosity

Mark :

  • A if A, B are correct
  • B if A, C are correct
  • C if B, D are correct
  • D if C, D are correct

Question - 4

There are two copper spheree-one is hollow and the other is solid. They are of the same size. If they are heated equally

  • A both the spheres expand equally
  • B the solid sphere will expand more
  • C the hollow sphere will expand non-uniformly
  • D the solid sphere will cool faster

Question - 5

540 g of ice at 0\(?\) is mixed with 540 g of water at 80\(?\). The final temperature on the mixture in \(?\) will be

  • A 0
  • B 20
  • C 40
  • D 80

Question - 6

The quantity of heat requires to convert 4 g of ice to steam is.

  • A 2480 cal
  • B 2560 cal
  • C 720 cal
  • D 2880 cal

Question - 7

Choose the INCORRECT statement :

  • A A cavity inside a solid ball expands on heating 
  • B The saturated vapour pressure of water at 100\(?\) is 0.76 m Hg
  • C The relative humidity is 110%
  • D Heat waves can pass through vacuum

Question - 8

20 g of copper (of specific heat 0.1) at 50\(?\) is place in a calorimeter containing 10 g water at 10\(?\). If the final temperature is 15\(?\), the water equivalent of the calorimeter is

  • A 20 g
  • B 4 g
  • C 40 g
  • D 10 g

Question - 9

Which one of the following substances has the lowest specific heat?

  • A Lead
  • B Silver
  • C Copper
  • D Aluminium

Question - 10

The complete conversion of a given amount of heat into mechanical work takes place

  • A often
  • B seldom
  • C never
  • D depending upon the device used
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