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10th P.S ONLINE QUIZ - 2 (HEAT) by PRABHAKAR MIRIYALA

Total questions: 40

Worksheet time: 30mins

Name
Class
Date
1.

Phase change from gas to liquid is called

a)

Evaporation

b)

Condensation

c)

Boiling

d)

Freezing

2.

Clothes dry easily when exposed to sunlight is an example of _____________________.

a)

condensation

b)

evaporation

c)

melting

d)

Boiling

3.

What is the boiling point of water

a)

1000 C

b)

273 K

c)

212 F

d)

All the above

4.
When a solid reaches the temperatures of its ___, it can become a liquid.
a)
melting point
b)
freezing point
c)
boiling point
d)
density
5.

The heat energy required to convert 1 gm. of solid completely into liquid at a constant temperature is called .....

a)

melting point

b)

boiling point

c)

latent heat of fusion

d)

latent heat of vaporisation

6.

Which is the opposite of condensation?

a)

melting

b)

evaporation

c)

precipitation

d)

transpiration

7.

A: we feel cool after sweating

R: condensation is the cooling phenomenon

a)

Both A and R are true

b)

A is true; R is false

c)

A is false: R is true

d)

Both A and R are false

8.

Phase change from liquid to gas at constant temperature is known as

a)

evaporation

b)

melting

c)

condensation

d)

boiling

9.

Melting Point of ice is

a)

A) 0 K

b)

B) 0 degrees Celsius

c)

C) 273 K

d)

D) both B and C

e)

E) Both A and B

10.

Ice floats on water because

a)

density of water is less than that of ice

b)

density of water is greater than that of ice

c)

density of ice and water is equal

d)

ice is in solid state

11.

The amount of water vapour present in air is called -----

a)

humidity

b)

pollution

c)

fog

d)

dew

12.

Latent heat of vaporization of water is ......

a)

80 cal/gm.

b)

540 J/gm

c)

540 cal/gm

d)

80 J/gm.

13.

A substance has a melting point of 25 oC and a boiling point of 235 oC. What state is it at 50oC?

a)

Solid

b)

Liquid

c)

Gas

d)

both solid and gas

14.

water ------- on freezing

a)

contracts

b)

expands

c)

no change

d)

boils

15.

An example of condensation that is formed droplets which you can see on leaves early in the morning

a)

fog

b)

cloud

c)

dew

d)

rain

16.

The heat energy required to change the state of matter without change in temperature is called as -----

a)

boiling temperature

b)

melting point

c)

specific heat

d)

latent heat

17.

During melting, energy is

a)

released

b)

absorbed

c)

stays the same

d)

zero

18.

During melting of ice, temperature ----

a)

Increases

b)

Decreases

c)

does not change

d)

may increase or decrease

19.
When a liquid reaches the temperatures of its ___, it can become a gas.
a)
melting point
b)
freezing point
c)
boiling point
d)
density
20.

SI unit of latent heat is ----

a)

J/Kg.k

b)

J/Kg

c)

cal/gm0C

d)

cal/gm

21.

The latent heat of fusion of ice is ----

a)

80 cal/kg

b)

80 cal/gm

c)

540 J/gm.

d)

540 cal/gm

22.

The average kinetic energy of the molecules is directly proportional to ---

a)

physical state

b)

absolute temperature

c)

melting point

d)

specific heat

23.

When a substance is heated, particles will

a)

Move further apart

b)

Get larger

c)

Move closer together

d)

Be unaffected

24.

The process when a solid turns into a gas

a)

Sublimation

b)

Deposition

c)

Evaporation

d)

Melting

25.

What is the term given to the temperature at which a liquid changes to a solid?

a)

Melting point

b)

Boiling point

c)

Sublimation point

d)

Freezing point

26.

What is the term given to the temperature at which a solid turns into a liquid?

a)

Boiling point

b)

Melting point

c)

Freezing point

d)

Heating point

27.

Which letter represents when the substance is a solid?

a)

A

b)

B

c)

C

d)

D

e)

E

28.

Which letter represents when the substance is a liquid?

a)

A

b)

B

c)

C

d)

D

e)

E

29.
The drops of water that appear on the outside of a glass of cold juice on a warm day are an example of?
a)
sublimation
b)
condensation
c)
evaporation
d)
melting
30.
Which phase changes require energy to be added in order for it to occur?
a)
evaporation, condensation, sublimation
b)
sublimation, melting, evaporation
c)
deposition, melting, evaporation
d)
melting, condensation, sublimation
31.

The graph shows the cooling curve of a substance. At which stages the specific latent heat released?

a)

AB and CD

b)

BC and DE

c)

AB and EF

d)

BC and CD

32.

Calculate the energy absorbed by 30 g of 100 ⁰C water that is turned into steam at 100 ⁰C.

a)

16,200 cal

b)

16,200 J

c)

3000 J

d)

3000 cal

33.

You have 20 g of water with specific heat of 4.18 J/g°C. The temperature changes from 25° C to 20° C. How much heat energy (Q) moves from the water to the surroundings?

a)

418 Joules

b)

209 J

c)

83 J

d)

4.18 J

34.
 How many joules of heat are needed to raise the temperature of 10.0 g of aluminum from 22°C to 55°C, if the specific heat of aluminum is 0.90 J/gx°C?    
a)
297 Joules
b)
0.003 Joules
c)
297 J/gx°C
d)
0.003 J/gx°C
35.

Which of the following best explains why the sand at the beach is hotter than the water?

a)

Sand has a higher specific heat than water.

b)

Sand has a lower specific heat than water.

c)

There is more water than sand at the beach.

d)

There is more sand than water at the beach.

36.

Water has a specific heat of 4184 J/KgºC. Wood has a specific heat of 1760 J/KgºC. Which material needs more energy to raise the temperature to 1ºC

a)

Wood

b)

Water

c)

Both are the same

d)

data is not sufficient

37.

Condensation takes place on dust particles forms a thick mist. this thick mist is called as ----

a)

fog

b)

cloud

c)

rain

d)

dew

38.

Which has more energy; hot water at 1000 C or steam at 1000 C

a)

steam at 1000 C

b)

water at 1000 C

c)

both have same energy

d)

we can't say

39.

Thetemperatures of A,B,C and D are 240C, 280 K, 297 K and 2800C respectively. which areain thermal equilibrium

a)

B and D

b)

A and D

c)

A and C

d)

B andC

40.

12gr. of water at 0oC is converted to water at 100oc. Then

a)

1200 cal. of heat is released

b)

80 cal. of heat is absorbed

c)

1200 cal. of heat is absorbed

d)

80 cal. of heat is released

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