Heat
1.When a solid substance is heated and turns into a liquid, this process is called:
A) Freezing
B) Melting
C) Condensation
D) Evaporation
Answer: B) Melting
2.The process of a liquid changing into a gas is known as:
A) Sublimation
B) Deposition
C) Evaporation
D) Freezing
Answer: C) Evaporation
3.When a solid directly turns into a gas without passing through the liquid state, it's called:
A) Melting
B) Evaporation
C) Sublimation
D) Condensation
Answer: C) Sublimation
4.The process of a gas turning into a liquid is known as:
A) Deposition
B) Evaporation
C) Sublimation
D) Condensation
Answer: D) Condensation
5.When a liquid is cooled and turns into a solid, this process is called:
A) Melting
B) Freezing
C) Evaporation
D) Condensation
Answer: B) Freezing
6.The process of a gas directly turning into a solid without passing through the liquid state is called:
A) Melting
B) Freezing
C) Sublimation
D) Deposition
Answer: D) Deposition
7.Which of the following substances can be found naturally on Earth in all three states of matter (solid, liquid, and gas)?
A) Oxygen
B) Nitrogen
C) Carbon Dioxide
D) Water
Answer: D) Water
8.Which of the following is a good conductor of heat?
A) Wood
B) Rubber
C) Copper
D) Glass
Answer: C) Copper
9.Substances that do not conduct heat easily are called:
A) Insulators
B) Conductors
C) Semi-conductors
D) Superconductors
Answer: A) Insulators
10.Which of the following materials is a bad conductor of heat?
A) Silver
B) Iron
C) Plastic
D) Aluminum
Answer: C) Plastic
11.Which of the following is not a good conductor of heat?
A) Glass
B) Copper
C) Iron
D) Aluminum
Answer: A) Glass
12.Which of the following materials is commonly used as an insulator in electrical wiring?
A) Copper
B) Rubber
C) Silver
D) Iron
Answer: B) Rubber
13.Why is the temperature inside an igloo (snow house) warm?
A) Snow is a good conductor of heat
B) Snow traps sunlight inside
C) Snow is a poor conductor of heat
D) Snow absorbs heat from the ground
Answer: C) Snow is a poor conductor of heat
14.Wind flows from one region to another region primarily due to:
A) Conduction
B) Convection
C) Radiation
D) Diffusion
Answer: B) Convection
15.In hot air balloons, heat is transferred by which process, causing the balloon to rise?
A) Conduction
B) Convection
C) Radiation
D) Sublimation
Answer: B) Convection
16.In refrigerators, why does cool air move downward and replace the hot air?
A) Due to conduction
B) Due to convection
C) Due to radiation
D) Due to evaporation
Answer: B) Convection
17.By which method is heat transferred through solids?
A) Convection
B) Radiation
C) Conduction
D) Reflection
Answer: C) Conduction
18.How is heat transferred through empty space, even through a vacuum?
A) Conduction
B) Convection
C) Radiation
D) Diffusion
Answer: C) Radiation
19.What is the primary way heat energy from the Sun reaches the Earth?
A) Conduction
B) Convection
C) Radiation
D) Evaporation
Answer: C) Radiation
20.Radiation is defined as the transfer of heat from one place to another in the form of:
A) Sound waves
B) Electromagnetic waves
C) Mechanical waves
D) Water waves
Answer: B) Electromagnetic waves
21.At what temperature does radiation begin to become visible to the eye as a dull red glow?
A) 100°C
B) 250°C
C) 500°C
D) 1000°C
Answer: C) 500°C
22.When a substance is heated to 500°C, the visible radiation appears as which color?
A) Blue
B) White
C) Yellow
D) Red
Answer: D) Red
23.As a substance is heated beyond 500°C, what color sequence does the radiation appear to our eyes?
A) Red, Green, Blue
B) Orange, Yellow, White
C) Yellow, Blue, Purple
D) Red, Yellow, Black
Answer: B) Orange, Yellow, White
24.What is the perceived color of a substance when it is heated to a very high temperature?
A) Red
B) Orange
C) Yellow
D) White
Answer: D) White
25.What is the SI unit of energy?
A) Calorie
B) Joule
C) Watt
D) Celsius
Answer: B) Joule
26.What is the symbol used to represent the unit of heat in the SI system?
A) C
B) W
C) J
D) H
Answer: C) J
27.What is the most commonly used unit of heat?
A) Watt
B) Joule
C) Calorie
D) Kelvin
Answer: C) Calorie
28.How much heat energy is required to raise the temperature of 1 gram of water through 1°C?
A) 1 Joule
B) 1 Calorie
C) 4.186 Joules
D) 1 Watt
Answer: B) 1 Calorie
29.What is the relation between calorie and joule?
A) 1 calorie = 1 J
B) 1 calorie = 3.5 J
C) 1 calorie = 4.186 J
D) 1 calorie = 5.2 J
Answer: C) 1 calorie = 4.186 J
30.Which of the following represents the correct amount of heat energy in joules for 1 calorie?
A) 1.5 J
B) 2.5 J
C) 3.5 J
D) 4.186 J
Answer: D) 4.186 J
31.The amount of energy in food items is measured in which unit?
A) Joule
B) Calorie
C) Kilo calorie
D) Watt
Answer: C) Kilo calorie
32.What is the approximate energy equivalent of 1 kilo calorie in joules?
A) 1000 J
B) 2000 J
C) 3000 J
D) 4200 J
Answer: D) 4200 J
33.What does the amount of heat energy required to raise the temperature of a substance by 1°C or 1 K represent?
A) Specific heat capacity
B) Heat capacity
C) Thermal conductivity
D) Latent heat
Answer: B) Heat capacity
34.What is the symbol used to denote heat capacity?
A) C
B) Q
C) ΔT
D) T
Answer: A) C
35.How is heat capacity calculated?
A) Heat capacity = ΔT / Q
B) Heat capacity = Q * ΔT
C) Heat capacity = Q / ΔT
D) Heat capacity = ΔT / C
Answer: C) Heat capacity = Q / ΔT
36.What is the unit of heat capacity in the SI system?
A) Cal / °C
B) Joule / Kelvin
C) Joule / °C
D) Cal / K
Answer: B) Joule / Kelvin
37.Compared to most other substances, water has a:
A) Lower heat capacity
B) Higher heat capacity
C) Similar heat capacity
D) No heat capacity
Answer: B) Higher heat capacity
38.What is the formula for calculating specific heat capacity?
A) C = Q / (m × ΔT)
B) C = m × Q / ΔT
C) C = ΔT / (Q × m)
D) C = Q / ΔT
Answer: A) C = Q / (m × ΔT)
39.What is the SI unit of specific heat capacity?
A) J / K
B) J / kg
C) J kg⁻¹ K⁻¹
D) J / °C
Answer: C) J kg⁻¹ K⁻¹
40.What is a calorimeter used for?
A) Measuring temperature
B) Measuring pressure
C) Measuring the amount of heat gained or lost
D) Measuring volume
Answer: C) Measuring the amount of heat gained or lost
41.Calorimeters are typically made of which materials?
A) Wood and plastic
B) Glass and ceramic
C) Copper or aluminum
D) Iron and steel
Answer: C) Copper or aluminum
42.In what year was the world’s first ice-calorimeter used?
A) 1682
B) 1782
C) 1882
D) 1982
Answer: B) 1782
43.Who invented the world's first ice-calorimeter?
A) Isaac Newton and Michael Faraday
B) Antoine Lavoisier and Pierre-Simon Laplace
C) James Joule and Rudolf Clausius
D) Albert Einstein and Niels Bohr
Answer: B) Antoine Lavoisier and Pierre-Simon Laplace
44.What is the primary function of a thermostat?
A) To measure temperature
B) To maintain a constant temperature
C) To control humidity
D) To measure pressure
Answer: B) To maintain a constant temperature
45.From which two Greek words is the term "thermostat" derived?
A) "thermo" and "static"
B) "thermo" and "dynamic"
C) "thermo" and "kinetic"
D) "thermo" and "potential"
Answer: A) "thermo" and "static"
46.Who invented the vacuum flask?
A) Michael Faraday
B) Sir James Dewar
C) Isaac Newton
D) Antoine Lavoisier
Answer: B) Sir James Dewar
47.In what year was the vacuum flask invented?
A) 1872
B) 1882
C) 1892
D) 1902
Answer: C) 1892
48.What is the vacuum flask also known as, in honor of its inventor?
A) Dewar jar
B) Dewar bottle
C) Dewar container
D) Dewar cup
Answer: B) Dewar bottle
49.What is the vacuum flask also known as, in honor of its inventor?
A) Dewar jar
B) Dewar flask
C) Dewar container
D) Dewar cup
Answer: B) Dewar flask
50.Heat is a form of ________.
a) electrical energy
b) gravitational energy
c) thermal energy
d) None of these
Answer: c) thermal energy
51.If you apply some heat energy to a substance, which of the following can take place in it?
a) Expansion
b) Increase in temperature
c) Change of state
d) All the above
Answer: d) All the above
52.Which of the following substances will absorb more heat energy?
a) Solid
b) Liquid
c) Gas
d) All of the above
Answer: c) Gas
53.If you apply an equal amount of heat to a solid, liquid, and gas individually, which of the following will have more expansion?
a) Solid
b) Liquid
c) Gas
d) All of them
Answer: c) Gas
54.The process of converting a liquid into a solid is called ________.
a) sublimation
b) condensation
c) freezing
d) deposition
Answer: c) freezing
55.Conduction is the way of heat transfer which takes place in a ____________.
a) solid
b) liquid
c) gas
d) All of them
Answer: a) solid
56.A calorimeter is a device used to measure the ________.
a) pressure
b) volume
c) amount of heat gained or lost
d) density
Answer: c) amount of heat gained or lost
57._______ is defined as the amount of heat required to raise the temperature of 1 kg of a substance by 1°C.
a) Heat capacity
b) Specific heat capacity
c) Thermal conductivity
d) Latent heat
Answer: b) Specific heat capacity
58.A thermostat is a device which maintains _________.
a) pressure
b) humidity
c) constant temperature
d) volume
Answer: c) constant temperature
59.The process of converting a substance from gaseous state to solid state is called _________.
a) condensation
b) freezing
c) sublimation
d) deposition
Answer: d) deposition
60.If you apply heat energy, the temperature of a system will ________.
a) decrease
b) remain constant
c) increase
d) stay the same
Answer: c) increase
61.If the temperature of a liquid in a container is decreased, then the interatomic distance will ___________.
a) increase
b) remain constant
c) decrease
d) become unpredictable
Answer: c) decrease
