### 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?

• 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