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10th P.S quiz - 8(Heat) by PRABHAKAR MIRIYALA

Total questions: 40

Worksheet time: 13mins

Name
Class
Date
1.

The value of 250C in Kelvin scale is

a)

25 K

b)

-298 K

c)

248 K

d)

298 k

2.

1 cal/gm. °C\degree C  =  -------- J/Kg.K

a)

4186

b)

4.186

c)

41.86

d)

418.6

3.

The amount of energy required to raise the temperature 1ºC for every kilogram is called____?

a)

latent heat

b)

Specific Heat

c)

latent heat of vaporization

d)

latent heat offusion

4.

SI unit of specific heat is

a)

calorie

b)

cal/gr.0C

c)

joiles

d)

J/Kg.K

5.

According to principle of method of mixtures

a)

Net heat lost > net heat gain

b)

Net heat lost < net heat gain

c)

Net heat lost = net heat gain

d)

none of the above

6.

Evaporation takes place -----

a)

at any temperature below its boiling point

b)

at constant temperature

c)

at any temperature above its boiling point

d)

none of the above

7.

which property of water makes it a good cooling agent?

a)

its liquid state

b)

its higher specific heat

c)

it is colourless

d)

its temperature

8.

Specific Heat (S) =

a)

mL

b)

Q. \Delta T

c)

Q/m. \Delta T

d)

m \Delta T /Q

9.

The higher the humidity, the ________________________ the rate of evaporation of water

a)

lower

b)

higher

c)

no change

d)

can't say

10.

Evaporation is a ______ phenomenon

a)

A) Bulk phenomenon

b)

B) cooling phenomenon

c)

C) Surface phenomenon

d)

D) both B and C

11.

which of thefollowing affect the rate of evaporation

a)

Humidity

b)

temperature

c)

surface are

d)

all the above

12.

Object A has a specific heat of 4.45 J/g⁰C and object B has a specific heat of 1.82 J/g⁰C. Which object will heat up faster?

a)

Object A, it has a lower spefici heat

b)

Object B, it has a lower specific heat

c)

Object A, it has a higher specific heat

d)

both the objects heat up with same rate.

13.

A high specific heat means...

a)

It requires less energy to change temperature

b)

It requires more energy to change temperature

c)

It heats up very quickly

d)

It cools down very quickly

14.

what is the SI unit of Heat Energy?

a)

J/Kg ºC

b)

no units

c)

ºC

d)

J

15.

When you holding a cup of ice water, your hand becomes cold. How does the heat transfer?

a)

From the cold cup to your hand

b)

From your hand to the cold cup.

c)

from the cold cup to air

d)

there is no transformation of heat take place

16.

Three bodies A,B and C are in thermal equilibrium. The temperature of A is 273 K, then the temperature of body C is ------

a)

5460 C

b)

3330C

c)

2730 C

d)

00 C

17.

What effect does Evaporation cause ?

a)

Heating Effect

b)

Magnetic Effect

c)

Cooling Effect

d)

Warming Effect

18.

What would be the final temperature of a mixture of 50gr. of water at 200C is mixed with 100gr. of water at 500C?

a)

600 C

b)

200 C

c)

300 C

d)

400 C

19.

Thetemperatures of A,B,C and D are 240 C, 280 K, 273 K and 70 C respectively. which areain thermal equilibrium

a)

C and D

b)

A and B

c)

A and C

d)

B and C

20.

which of the following is correct? 

a)

 °C\degree C = K + 273 

b)

K =  °C\degree C  + 273

c)

 \degree C  = 273 - K

d)

 \degree C + K= 273 

21.

The specific heat of aluminum is 0.21 cal/g°C. How much heat(Q) is released when a 20 g piece of aluminum foil is taken out of the oven and cools from 100° to 50°?

a)

105 J

b)

210 J

c)

1.05 J

d)

2.10 J

22.

1 cal = ----------- joules

a)

273

b)

4.186

c)

4186

d)

-273

23.

Large oceans moderate the climatic temperatures of surrounding coastal land areas because the temperature of ocean water changes

a)

rapidly, due to water’s low specific heat

b)

rapidly, due to water’s high specific heat

c)

slowly, due to water’s low specific heat

d)

slowly, due to water’s high specific heat

24.

What is the SI unit for temperature?

a)

Kelvin

b)

Celcius

c)

Fahrenheit

d)

joules

25.

the amount of water vapour present in air is known as

a)

atmosphere

b)

humidity

c)

atmospheric pressure

d)

pollution index

26.

the state of body where it neither recieves nor gives out heat energy is

a)

solid

b)

thermal equilibrium

c)

freezing

d)

sublim

27.

Which has more energy : water at 00 C (or) ice at 00 C

a)

water at 00 C

b)

ice at 00 C

c)

both have same energy

d)

can't say

28.

which have less energy water at 1000 C (or) steam at 1000 C

a)

water at 1000 C

b)

steam at 1000 C

c)

both have same energy

d)

can't say

29.

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

a)

80 cal/gm.

b)

100 cal/gm

c)

540 cal/gm

d)

273 cal/gm.

30.

SI unit of latent heat is ----

a)

J/Kg.k

b)

J/Kg

c)

cal/gm0C

d)

cal/gm

31.

A substance has a melting point of 25 oC and a boiling point of 235 oC. What state is it at 5oC?

a)

Solid

b)

Liquid

c)

Gas

d)

both solid and gas

32.

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

33.

Ice floats on water because

a)

density of ice is less than that of water

b)

density of ice is greater than that of water

c)

density of ice and water is equal

d)

ice is in solid state

34.

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

a)

physical state

b)

absolute temperature

c)

melting point

d)

specific heat

35.

The ------- behave like heat store houses for the earth.

a)

forests

b)

oceans

c)

mountains

d)

deserts

36.

Boiling occurs when water ...

a)

loses heat

b)

gains heat

c)

No heat transfermation occurs

d)

At thermal equilibrium

37.

How much energy is transferred when 1 gm of boiling water at 1000 C condenses to water at 1000 C

a)

540 cal released

b)

80 cal released

c)

540 cal absorbed

d)

80 cal absorbed

38.

The sultryness in summer days is due to

a)

More humidity in atmosphere

b)

Less humidity in atmosphere

c)

No power in summer days

d)

More condensation take place

39.

The phase change from solid to gaseous state is known as

a)

Melting

b)

Boiling

c)

Condensation

d)

Sublimation

40.

formula that you use to calculate the heat energy, if there is no change in temperature of the system

a)

Q = mL

b)

Q = mSΔT

c)

T = M1T1 + M2T2 / M1+M2

d)

All the above

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