Heat and Temperature
1. Which refers the temperature?
A : It is a form of energy
B : It tells the state of heat
C : It tells specific heat of substance
D : It is measured by calorie meter
2. What is the S.I unit of heat?
A : Calorie
B : Joule
C : Centigrade heat unit
D : British thermal unit
3. Which instrument is used to measure heat?
A : Calorie meter
B : Thermometer
C : Pyrometer
D : Barometer
4. What is the quantity of heat required to raise the temperature of 1 gram of water through 1°C is called?
A : Specific heat
B : Colorie
C : British thermal unit
D : Centigrade heat unit
5. What is the value for specific heat of water?
A : 4
B : 3
C : 2
D : 1
6. Which type heat is the heat absorbed or given off by a substance without changing its physical state?
A : Latent heat
B : Sensible heat
C : Specific heat
D : Latent heat of steam
7. What is the boiling point of water in Fahrenheit scale?
A : 212°F
B : 180°F
C : 112°F
D : 100°F
8. What is the freezing point of water in kelvin scale (K)?
A : 373°K
B : 313°K
C : 303°K
D : 273°K
9. Convert 45°C into °F.
A : 110°F
B : 111°F
C : 112°F
D : 113°F
10. At what temperature will Fahrenheit and centigrade thermometers give the same reading?
A : -38°C
B : -39°C
C : -40°C
D : -41°C
11. Convert - 273°C (Centigrade) into kelvin scale?
A : 0°K
B : 1°K
C : 2°K
D : 3°K
12. What is the value in degree centigrade for 20°F?
A : -6.37°C
B : -6.47°C
C : -6.57°C
D : -6.67°C
13. What is the maximum temperature that can be measured by mercury thermometer?
A : 400°C
B : 300° C
C : 200° C
D : 100°C
14. What is the name of temperature measuring instrument?
B : Bimetalic thermometer
C : Radiation pyrometer
D : Thermoelectric pyrometer
15. Which instrument is used to measure temperatures of red hot metals up to 3000°C?
A : Radiation pyrometer
B : Thermoelectric pyrometer
C : Bimetal thermometer
D : Alcohol thermometer
16. Which type of heat transmission takes place through physical contact?
A : Conduction
B : Convection
C : Radiation
D : Reflection
17. Which kind of heat transmission takes places by up-ward flow?
A : Conduction
B : Convection
C : Radiation
D : Reflection
18. Which one is the radiation method of heat transmission?
A : An iron rod is heated with one of its end and heat transmitted to other end
B : Cold water goes to the bottom from top while on heating the water
C : On heating gases, heat transmitted to surroundings
D : The heat from sun travels through the space
19. What is called if the length of the solid expands when heated?
A : Linear expansion
B : Superficial expansion
C : Cubical expansion
D : Area expansion
20. What is the change in length per unit original length per degree rise in temperature is called?
A : Co-efficient of friction
B : Co-efficient of linear expansion
C : Co-efficient of superficial expansion
D : Co-efficient of cubical expansion
21. What is the unit of co-efficient of linear expansion?
A : Number /°C
B : Number /°C / meter length
C : Number /°C / mm length
D : Number /°C / cm length
22. What is term used for 2 x linear expansion?
A : Co-efficient of friction
B : Co-efficient of linear expansion
C : Co-efficient of superficial expansion
D : Co-efficient of cubical expansion
23. What is term called for 3 x linear expansion?
A : Co-efficient of friction
B : Co-efficient of linear expansion
C : Co-efficient of superficial expansion
D : Co-efficient of cubical expansion
24. What is the co-efficient of linear expansion of a rod if it is found to be 100 m long at 20°C and 100.14 m long at 100°C?
A : 1.75 x 10-4 / °C
B : 1.75 x 10-5 / °C
C : 1.75 x 10-6 / °C
D : 1.75 x 10-7 / °C
25. What is called for the amount of heat required to raise the temperature of unit mass of a substance through 1°C?
A : Sensible heat
B : Latent heat
C : Specific heat
D : Mixing of heat
26. How much quantity of heat is required? m = 120 litres, t1 = 20°C, t2 = 85°C, S = 4.2, Q =_ KJ
A : 32750 KJ
B : 32760 KJ
C : 32770 KJ
D : 32780 KJ
27. Calculate the amount of heat required to raise the temperature of 85.5 gm of sand from 20°C to 35°C specific heat of sand = 0.1.
A : 128.25 Joules
B : 125.28 Joules
C : 128.26 Joules
D : 126.28 Joules
28. What is the specific heat of the material if we require 510 calories to raise the temperature of 170 gm of material from 50°C to 80°C?
A : 0.1
B : 0.01
C : 1.1
D : 1.11
29. How much quantity of heat is required to raise the temperature of 300 grams of copper (sp.heat 0.092 cal/gram) from 25°C to 75°C in Kcal?
A : 138 Kcal
B : 1.38 Kcal
C : 207 Kcal
D : 2.07 Kcal
30. How much heat is absorbed by a copper ingot weighing 400 Kg is heated from 40°C to 72°C for the purpose of forging? (sp.heat of copper is 0.09)
A : 1521 Kcal
B : 1251 Kcal
C : 1152 Kcal
D : 1215 Kcal
31. What is called for the materials that restricts heat flow by radiation, conduction and convection?
A : Conductors
B : Insulators
C : Ferrous
D : Non-ferrous
32. Which one is heat insulator?
A : Thermocole
B : Copper
C : Brass
D : Aluminium
33. Which one has the highest thermal conductivity?
A : Solid ice
B : Melting ice
C : Water
D : Steam
34. Which one of the following is not a property of heat insulating material?
A : Low conductivity
B : Resistance to fire
C : Less moisture absorption
D : Ductility
35. Which insulating material is most widely used in refrigerators?
A : Thermocole
B : Polyurethane
C : Glass wool
D : Cork sheet
36. Which one is a poor heat insulator?
A : Glass
B : Cork
C : Rubber
D : Saw dust
37. What is known for the temperature at which any solid melts into liquid?
A : Boiling point
B : Melting point
C : Latent heat of fusion
D : Latent heat of vaporisation
38. What is the melting point of aluminium?
A : 660° C
B : 680°C
C : 670°C
D : 620°C
39. What is the boiling point of aluminium?
A : 1897°C
B : 2519°C
C : 2469°C
D : 660°C
40. What is the boiling point of water?
A : 0°C
B : 32°C
C : 100°C
D : 212°C
41. What is the melting point of mercury?
A : -357°C
B : -209°C
C : -7.1°C
D : -38.72°C
42. What is the boiling point of mercury?
A : 357°C
B : 280°C
C : 759°C
D : 767°C
43. What is the ratio of force (or) thrust per unit area?
A : Work
B : Power
C : Pressure
D : Energy
44. What is the equivalent pascal value for 1 bar?
A : $\displaystyle 10^{5}$ pascal
B : $\displaystyle 10^{7}$ pascal
C : $\displaystyle 10^{3}$ pascal
D : $\displaystyle 10^{9}$ pascal
45. What is the SI unit of pressure?
A : Joule
B : Pascal
C : Bar
D : Newton
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