Maharashtra Board Class 8 Science MCQ on Chapter 14 Measurement and Effects of Heat

Maharashtra Board Class 8 Science MCQ on Chapter 14 Measurement and Effects of Heat

1 ) The bulb and the part of liquid in a thermometer is filled with what?

A ) Mercury

B ) Alcohol

C ) Both 1 and 2

D ) Water

Ans C ) Both 1 and 2

2 ) What is the boiling point of water in Fahrenheit?

A) 2730F

B) 2320F C )2120F D) 2210F

Ans C ) 2120 F

3 ) Formula for calculating amount of heat is

A ) Q = mcT

B ) Q = m / cT

C ) Q = mc (T2 – T1)

D )Q = mc / T2−T1

Ans C ) Q = mc(T2 – T1)

4 ) Which thermometer does not work by the principle of expansion of the liquid due to heat ?

A ) Clinical Thermometer

B ) Digital Thermometer

C ) Both 1 and 2

D ) None of the above

Ans B ) Digital Thermometer

5 ) The thermometer used in homes is called

A ) Digital Thermometer

B ) Clinical Thermometer

C ) Mechanical thermometer

D ) All of the above

Ans B ) Clinical Thermometer

6 ) What is the CGS unit of heat ?

A ) Joule

B ) Erg

C ) Calorie

D ) Newton

.

Ans C ) Calorie

again.

7 ) A thermometer containing alcohol is dipped in a liquid. The initial volume of the alcohol was 5 ml. When the liquid is heated the alcohol rises to a certain height in the thermometer and its volume increases to 5.25 ml. By how much amount is the temperature of the liquid changed during the process? [βalcohol = 10-3 (1/0C)]

A ) 5000 C B ) 500 C C ) 250 C D ) 1500 C

Ans B ) 500 C

8 ) The heat received from the earth is called …………… .

A ) Thermal energy

B ) Geothermal energy

C ) Chemical energy

D ) Green energy

Ans B ) Geothermal energy

9 ) Relation between kelvin and celsius is

A ) K = C + 273.15 B ) C = K + 273.15 C ) K = 273.15/C D ) C = K/273.15

Ans A ) K = C + 273.15

10 ) A amount of heat is present in air all around us

A ) Large

B ) Small

C ) Can’t say

D ) None of the above

Ans A ) Large

11 ) is used to measure the heat content of an object

A ) Thermometer B ) Caloriemeter C ) Caloriegram D ) Caloriometer

Ans B ) Caloriemeter

12 ) Which of the following equation is correct?

A ) Qo = Qc + Qw

B ) Qo = Qc × Qw

Qo = Qc

C ) Qw

D ) Qo = Qc – Qw

Ans A ) Qo = Qc + Qw again.

13 ) A special type of thermometer used to measure the temperatures of a day is termed as ………….. .

A ) Clinical thermometer

B ) Laboratory thermometer

C ) Digital thermometer

D ) Maximum – minimum thermometer Ans D ) Maximum – minimum thermometer 14 ) One calorie is equal to

A ) 4.18 J B ) 1.48 J C ) 8.14 J D ) 4.81 J

Ans A ) 4.18 J

14 ) Which of the following effects of heat does a mercury thermometer work on ?

A ) Expansion of gases.

B ) Change of state.

C ) Expansion of liquids.

D ) Anomalous behaviour.

Ans C ) Expansion of liquids.

15 ) Which unit of temperature is used majorly in scientific experiments?

A ) Celcius

B ) Fahrenheit

C ) Kelvin

D ) Both 1 and 3

Ans C ) Kelvin

16 ) Higher the temperature of the solid

A ) Slower is the velocity of oscillation

B ) Higher is the velocity of oscillation

C ) Velocity is independent of temperature

D ) None of the above

Ans B ) Higher is the velocity of oscillation

17 ) Q does not depend on

A ) Specific heat B ) Temperature C ) Time

D ) Mass

Ans C ) Time

18 ) Because of the increased temperature the alcohol inside the thermometer
Expands and the level goes down

A ) again.

B ) Expands and the level rises

C ) Shrinks and the level rises

D ) Shrinks and the level goes down

Ans B ) Expands and the level rises

19 ) Formula for expansion coefficient is

A ) λ = (l2 – l1) / (l1 ∆T)

B ) λ = (l1 – l2) / (l2 ∆T)

C ) λ = (l1 – l2) / (l1 ∆T)

D ) λ = (l2 – l1) / (l2 ∆T)

Ans A ) λ = (l2 – l1) / (l1 ∆T)

20 ) Which of the following is not an effect of heat?

A ) Expansion

B ) Contraction

C ) Change of state

D ) None of the above

Ans D ) None of the above

21 ) The atoms in a solid object are tied to one another because

A ) Of the forces acting between them.

B ) Of the Kinetic energy between the molecules C ) The intermolecular forces between the atoms D ) Both 1 and 3

Ans D ) Both 1 and 3

22 ) When same amount of heat is given to two identical blocks made of aluminium and copper, whose temperature will be more after 10 minutes of heating ?

(Consider the two blocks have same initial temperature.)

A ) Aluminium block.

B ) Copper block.

C ) Both will attain same temperature.

D ) It will depend on the atmospheric pressure.

Ans B ) Copper block.

23 ) CGS unit of specific heat is

A ) Joule/Kg Celsius

B ) Calorie/ Kg Celsius

C ) Calorie/ gm Celcius

D ) Calorie/ Kg Fahrenheit

Ans C ) Calorie/ gm Celcius

24 ) What is the freezing point of mercury?

A ) 23 Celsius

B ) 296 K

C ) 0 Celsius

D ) -38.8 celsius

Ans D ) -38.8 celsius

again.

25 ) What is the relation between the three units of the temperature?

A ) F−32 = C 9 5

B ) F−32 = C 5 9

C ) F = C−32 5 9

D ) None of the above

Ans A ) F−32 = C 9 5

26 ) The inner vessel of the caloriemeter is made up of

A ) Iron

B ) Steel

C ) Copper

D ) Aluminium

Ans C ) Copper

27 ) is the amount of heat required to increase the temperature of unit mass of that substance through

one degree.

A ) Specific energy

B ) Specific heat C ) Kinetic energy D ) Heat energy

Ans B ) Specific heat

28 ) Heat is a form of energy which

A ) Is constant in all systems

B ) Flows from higher temperature to lower temperature

C ) Flows from lower to higher temperature

D ) Can be obtained from only one source

Ans B ) Flows from higher temperature to lower temperature

29 ) Change of length is

A ) Directly proportional to the original length

B ) Inversely proportional to the original length

C ) Does not depend on the temperature change

D ) None of the above

Ans A ) Directly proportional to the original length

30 ) Which of the following is not a source of heat?

A ) Solar

B ) Chemical

C ) Nuclear

D ) None of the above

Ans D ) None of the above

31 ) What is the freezing point of water?

A ) 32 F

B ) 0 Celsius

C ) 273 K

D ) Both 2 and 3

Ans D ) Both 2 and 3

32 ) Using calorimeter it is possible to determine.

A ) Specific heat of an object. B ) Heat content of an object. C ) Temperature of an object. D ) All of these.

Ans D ) All of these.

33 ) Which thermometer has a sensor which can measure the heat coming out from the body directly and from that can measure the temperature of the body?

A ) Clinical Thermometer

B ) Digital Thermometer

C ) Mechanical Thermometer

D ) None of the above

Ans B ) Digital Thermometer

34 ) Which of these statements is incorrect?

If the average kinetic energy of atoms in two objects is equal then their temperatures

A ) will also be equal.

The velocity of atoms in the gas at higher temperature is larger than the velocity of

B ) atoms in the gas at lower temperature.

C ) The temperature of a substance is not related to the average kinetic energy of atoms.

D ) None of the above

Ans C ) The temperature of a substance is not related to the average kinetic energy of atoms.

35 ) Because of the increased temperature the alcohol inside the thermometer

A ) Expands and the level goes down

B ) Expands and the level rises

C ) Shrinks and the level rises

D ) Shrinks and the level goes down

Ans B ) Expands and the level rises

.

 

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