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Mechanical - 540 UNIT 4 Heat and Temperature - MCQ

51)   

The amount of heat required to change the state of 1 kg of a substance without changing its temperature is called:

A.
B.
C.
D.
Answer: B
52)   

 During melting, the temperature of a substance:

A.
B.
C.
D.
Answer: B
53)   

 The energy possessed by a body due to motion of molecules is called:

A.
B.
C.
D.
Answer: C
54)   

Which of the following does not change during a phase change (e.g., melting)?

A.
B.
C.
D.
Answer: B
55)   

Which material will heat up fastest when same amount of heat is supplied? 

A.
B.
C.
D.
Answer: B
56)   

 Which of the following devices can measure temperature electronically? 

A.
B.
C.
D.
Answer: C
57)   

Which instrument is used to measure heat energy?

A.
B.
C.
D.
Answer: C
58)   

Which of the following does NOT work based on thermal expansion? 

A.
B.
C.
D.
Answer: D
59)   

What is the principle of bimetallic thermometer?

A.
B.
C.
D.
Answer: C
60)   

Which of the following is a contact-type temperature measuring device? 

A.
B.
C.
D.
Answer: B
61)   

Which method of heat transfer is fastest?

A.
B.
C.
D.
Answer: C
62)   

 Convection cannot occur in:

A.
B.
C.
D.
Answer: C
63)   

The shiny silver coating inside a thermos flask reduces heat loss due to:

A.
B.
C.
D.
Answer: C
64)   

Which of the following is not a thermal insulator?

A.
B.
C.
D.
Answer: D
65)   

Heat transfer from Sun to Earth takes place through: 

A.
B.
C.
D.
Answer: C
66)   

Which metal has the highest thermal conductivity? 

A.
B.
C.
D.
Answer: C
67)   

Which of the following is NOT used as a heat insulator in buildings? 

A.
B.
C.
D.
Answer: D
68)   

Which of the following materials is used in heat sinks? 

A.
B.
C.
D.
Answer: C
69)   

Heat conduction depends on: 

A.
B.
C.
D.
Answer: D
70)   

The rate of heat flow is directly proportional to: 

A.
B.
C.
D.
Answer: C
71)   

Which instrument measures atmospheric pressure?

A.
B.
C.
D.
Answer: B
72)   

Gauge pressure is zero when:

A.
B.
C.
D.
Answer: B
73)   

The pressure inside a vacuum chamber is measured using a: 

A.
B.
C.
D.
Answer: C
74)   

What is the unit of absolute pressure? 

A.
B.
C.
D.
Answer: B
75)   

 Which gauge is most commonly used in industry for measuring fluid pressure?

A.
B.
C.
D.
Answer: A