Heat And Temperature

Question 1

1 cal =

Answer 1

4.186 J

Question 2

Kelvin, Celsius, Fahrenheit scale relation

Answer 2

(Tk-273)/100=Tc/100=(Tf-32)/180

Question 3

Branch dealing with measurement of temperature is

Answer 3

Thermometry

Question 4

Thermometric properties equation

Answer 4

(Xt-Xo)/t = (Xioo-Xo)/100

Question 5

Triple point

Answer 5

It refers to the point where the gaseous,solid and liquid states of water coexist in equilibrium

Question 6

Triple point equation

Answer 6

T/Ttrp = X/Xtrp

T=[X/Xtrp x 273.15]K

Question 7

Types of thermometers

Answer 7

1. Constant volume gas thermometer
   T=p/ptrp x 273.16
2. Platinum Resistance Thermometer
   T= R/Rtrp x 273.16
3. Mercury Thermometer
   T= l/ltrp x 273.16

Question 8

Types of thermal expansion

Answer 8

1. Linear expansion
   L’ =L(1+@/\T)
   @-coefficient of linear expansion
2. Areal Expansion
   A’ = A(1+beta/\T)
   Beta-coefficient of areal expansion
3. Volume Expansion
   V’ = V(1+gama/\T)
   Gama-coefficient of cubical expansion

Question 9

Why do liquids overflow

Apparent expansion of liquids

Answer 9

Coefficient of cubical expansion is greater for liquids than solids and hence they overflow when completely filled in a container. This termed as apparent expansion of liquid

Question 10

Dulong and Petits method

Answer 10

Coefficient of specific heat= ht-ho/hot

Question 11

Anomalous expansion of water

Answer 11

Water contracts from 0-4C

Coefficient of specific heats = 1/T = 1//\T(/\V/V)

Question 12

Heat capacity =

Answer 12

/\Q = mc/\T

Question 13

Principle of calorimetry

Answer 13

Amount of heat lost = Amount of heat gained

OR

Heat lost by body 1=Heat gained by body 2

Question 14

Latent heat =?

Answer 14

Q = mL

Question 15

Water Equivalent

Answer 15

Of a substance refers to the amount of water which when replaced with the substance gives same rise in temperature and requires same amount of heat for the rise

MwCw = MsCs

Question 16

Debater T^3 law states that

Answer 16

Specific heat of solid varies with temperature

It’s 3R at high temp. A

Near 0K it’s c ~ T^3

Question 17

Clausius Clapeyron’s/ Latent Heat equation

Answer 17

/\p = (Jl) / (T/\V)

Question 18

Hygrometry

Answer 18

Branch which studies and measures water vapour in atmosphere

RH = m/M x100
Where m-mass of water
M- mass of vapour

RH = p/P X 100
Where p-actual
P-maximum