Heat Test

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Heat Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

The direction of the flow of heat depends upon

A
quantity of heat in a body

B
temperature difference

C
both 1 and 2

D
none of these
Question 2
1 / -0

What is the normal temperature of a human body on Fahrenheit scale?

A
36.8^o

B
63.8^o

C
98.6^o

D
95.3^o

Solution

Correct Answer: 98.6^o
Question 3
1 / -0

Two bodies A and B are at the same temperature (50^oC).They are placed in contact. The final result will be

A
temperature of A becomes 100^oC

B
temperature of B becomes 100^oC

C
temperature of both A and B becomes 100^oC

D
no change in temperature
Question 4
1 / -0

The quantity of heat required to heat a substance depends upon

A
its mass

B
rise in temperature

C
nature of substance

D
all of these
Question 5
1 / -0

The quantity of heat required to raise the temperature of 1 gm of substance through 1^oC is called

A
calorie

B
specific heat

C
latent heat

D
water equivalent

Solution

Correct answer - 2
The specific heat of a substance is the number of calories needed to raise the temperature of one gram by 1^oC. Because one degree on the Celsius scale is equal to one Kelvin, specific heats in the metric system can be reported in units of either cal/g-^oC or cal/g-K.
Question 6
1 / -0

The equivalent of 100^oC on fahrenheit scale is

A
373^oF

B
212^oF

C
87.5^oF

D
32^oF

Solution

= 20 x 9 + 32 (using BODMAS)

= 180 + 32 = 212^oF
Question 7
1 / -0

The branch of physics, which deals with the study and measurement of heat is called

A
pyrometry

B
calorimetry

C
thermometry

D
astrophysics
Question 8
1 / -0

The process in which heat flows from one end of the body to other in the direction of fall of temperature without actual movement of the particles is called

A
convection

B
conduction

C
radiation

D
none of these
Question 9
1 / -0

What is 0^oC on a Kelvin scale?

A
273 K

B
- 273 K

C
186.5 K

D
- 186.5 K

Solution

We know,
Temperature in Kelvin = Temperature in °C + 273
Putting the temperature in °C as zero, we get temperature in kelvin as 273 K.
Question 10
1 / -0

Transfer of heat in liquid and gases is primarily by

A
conduction

B
convection

C
radiation

D
none of these
Question 11
1 / -0

Latent heat of fusion of ice is

A
80 k cal/gm

B
80 cal /kg

C
80 cal/gm

D
100 cal/gm
Question 12
1 / -0

The amount of heat required to convert a unit mass of a liquid at its boiling point to vapours at the same temperature is called

A
latent heat of fusion

B
thermal capacity

C
latent heat of vaporization

D
specific heat
Question 13
1 / -0

In a pressure cooker water boils at

A
nearly 100^oC

B
more than 100^oC

C
less than 100^oC

D
none of these
Question 14
1 / -0

Latent heat of vaporisation of water boiling under normal pressure is

A
470 cal/g

B
540 cal/g

C
580 cal/g

D
640 cal/g
Question 15
1 / -0

Calculate the quantity of heat given off by 100 gm of water, when it cools from 100^oC to 70^oC.

A
1 cal

B
2000 cal

C
3000 cal

D
None of these

Solution

H = M x S x T = 100 g x 1 Cal/g. ^oC x 30 ^oC = 3000 ^oC.
Question 16
1 / -0

The amount of ice (at 0^oC) that can be melted by 4000 calories of heat (latent heat of fusion of ice is 80 cal/g) is

A
320 g

B
50 g

C
0.02 g

D
100 g
Question 17
1 / -0

Roughly speaking, liquids expand about _________ times more than solids.

A
50

B
2

C
10

D
100
Question 18
1 / -0

The temperature of a body is a measure of the

A
average kinetic energy of the molecules

B
total energy of the molecules

C
velocity of the molecules

D
average potential energy of the molecules
Question 19
1 / -0

The most commonly used thermometric substance is

A
water

B
alcohol

C
mercury

D
turpentine

Solution

Option (3)
Mercury is the most commonly used thermometric substance.
It is used because it has high melting and boiling points making it a liquid over a broad range of temperature. Since it is a metal, it has a stable coefficient of expansion; hence, it expands uniformly and noticeably for a slight change of temperature.
Question 20
1 / -0

Celsius scale divides two fixed points equally into

A
100 parts

B
180 parts

C
212 parts

D
32 parts

Solution

Option (1)
The Celsius scale is also known as the centigrade temperature scale. In the Celsius scale, the lower fixed point is taken as 0ºC and the upper fixed point is taken as 100ºC. The interval between 0ºC and 100ºC is called the fundamental interval. The fundamental interval is divided into 100 equal parts.

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Heat Test - 3

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Heat Test - 3

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SHARING IS CARING

Question 1

quantity of heat in a body

temperature difference

both 1 and 2

none of these

Question 2

36.8o

63.8o

98.6o

95.3o

Solution

Question 3

temperature of A becomes 100oC

temperature of B becomes 100oC

temperature of both A and B becomes 100oC

no change in temperature

Question 4

its mass

rise in temperature

nature of substance

all of these

Question 5

calorie

specific heat

latent heat

water equivalent

Solution

Question 6

373oF

212oF

87.5oF

32oF

Solution

Question 7

pyrometry

calorimetry

thermometry

astrophysics

Question 8

convection

conduction

radiation

none of these

Question 9

273 K

- 273 K

186.5 K

- 186.5 K

Solution

Question 10

conduction

convection

radiation

none of these

Question 11

80 k cal/gm

80 cal /kg

80 cal/gm

100 cal/gm

Question 12

latent heat of fusion

thermal capacity

latent heat of vaporization

specific heat

Question 13

nearly 100oC

more than 100oC

less than 100oC

none of these

Question 14

470 cal/g

540 cal/g

36.8^o

63.8^o

98.6^o

95.3^o

temperature of A becomes 100^oC

temperature of B becomes 100^oC

temperature of both A and B becomes 100^oC

373^oF

212^oF

87.5^oF

32^oF

nearly 100^oC

more than 100^oC

less than 100^oC