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
.
