Heat part – 1 ( POLYCET 2022)

If 200 cal. heat energy is required 40 grams of liquid to its gaseous state then the latent heat of vaporization is
a. 4 cal/g
b. 5 cal/g
c. 8000 cal/g
d. 240 cal/g

For same change in temperature the amount of heat(Q) absorbed by a substance is _____ to its mass.
a. Equal
b. Directly
c. Inversely proportional
d. Not proportional

The temperature of a steel rod is 330K . Its temperature in 0C is
a. 55 degree C
b. 57 degree C
c. 59 degree C
d. 53 degree C

If we keep a metal piece and a wooden piece in the refrigerator which one get colder ?
a. Metal piece
b. Wooden piece
c. Both get colder
d. None

The water droplets condensed on surface is known as
a. Humidity
b. Dew
c. Moisture
d. All

What is the S.I. unit of heat ?
a. Joule
b. Calorie
c. Kelvin
d. Celsius

Rate of evaporation of liquid depends upon
a. Surface area
b. Temperature
c. Water vapour in surrounding air
d. All

Specific heat of lead in J/Kg-K is
a. 128
b. 130
c. 391
d. 882

Glass specific heat is
a. 504 J/kg
b. 10.12 J/kg
c. 0.13 J/kg
d. 0.22 J/kg

Temperature measured on which scale is called absolute temperature.
a. Celsius scale
b. Kelvin scale
c. Fahrenheit scale
d. All

What is the reason for hotness of samosa inside and coldness outside
a. Low specific heat
b. High specific heat
c. Outside layer has high specific heat
d. We can’t tell

The heat needed to raise the temperature of a certain mass of substance to a certain level by using the formula is
a. Q=mT delta T
b. Q=mS delta s
c. Q=mS delta T
d. Q=mS delta T

Pick up the correct statement from the following (a)Evaporation is a cooling process . (b) Boiling is a warming process
a. Only A is
b. Only B is true
c. Both A and B are true
d. Both A and B are false

Specific heat of mercury in J/Kg-K
a. 130
b. 139
c. 380
d. 391

Reverse process of condensation is
a. Freezing
b. Melting
c. Evaporation
d. None

The process in which the substance in liquid phase changes to solid phase by losing same energy from it is called
a. Freezing
b. Humidity
c. Not mentioned
d. None

How much energy is absorbed when 10g of ice at 0 degree C becomes steam at100 degree C?
a. 9700 cal
b. 9800 cal
c. 9500 cal
d. 9600 cal

Latent heat of fusion units in S.I are
a. J/kg
b. cal/g
c. J/cal
d. g/J

Convert 0 degree Celsius in kelvin
a. 272
b. 270
c. 274
d. 273

S.I unit of specific heat is
a. cal/g degree C
b. J/kg-K
c. J/kg-H
d. Newton/ohm