Chapter 4 – Heat – Multiple Choice Questions (MCQs) and Answers (Solved Worksheet)
Question- What type of clothes are suitable for winter?
a) Cotton clothes
b) Woollen clothes
c) Polyester clothes
Answer- b) Woollen clothes
Question- What does a clinical thermometer consist of?
a) Mercury and a visible mercury thread
b) Only mercury
c) Only a visible mercury thread
Answer- a) Mercury and a visible mercury thread
Question- What should be exercised when dealing with very hot objects?
a) Negligence
b) Caution
c) Indifference
Answer- b) Caution
Question- What is necessary to do with the thermometer before taking a temperature reading?
a) Heat it up
b) Clean it properly
c) Use it directly
Answer- b) Clean it properly
Question- What unit should always be included when stating a temperature reading?
a) Fahrenheit
b) Kelvin
c) Degrees Celsius
Answer- c) Degrees Celsius
Question- Which of these thermometers is less prone to breakage?
a) Mercury thermometer
b) Glass thermometer
c) Digital thermometer
Answer- c) Digital thermometer
Question- What is essential to avoid when holding a thermometer for reading?
a) Holding by the bulb
b) Holding upright
c) Holding gently
Answer- a) Holding by the bulb
Question- What is the temperature range that a laboratory thermometer typically measures?
a) 0°C to 100°C
b) -10°C to 110°C
c) -35°C to 35°C
Answer- b) -10°C to 110°C
Question- Which part of the thermometer should not touch the container’s surface while measuring?
a) The scale
b) The top
c) The bulb
Answer- c) The bulb
Question- Which material is a good conductor of heat?
a) Plastic
b) Wood
c) Metal
Answer- c) Metal
Question- Heat always flows from ___________.
a) colder objects to hotter ones
b) hotter objects to colder ones
c) All objects equally
Answer- b) hotter objects to colder ones
Question- Which process demonstrates the transfer of heat in solids?
a) Convection
b) Conduction
c) Radiation
Answer- b) Conduction
Question- What property determines if a material is a good conductor of heat?
a) Weight
b) Ability to allow heat to pass through
c) Colour
Answer- b) Ability to allow heat to pass through
Question- Which material is likely to be an insulator?
a) Iron
b) Plastic
c) Copper
Answer- b) Plastic
Question- Which experiment outcome indicates that a material is a good conductor of heat?
a) The non-dipped end feels cool.
b) The non-dipped end feels hot.
c) The material changes colour.
Answer- b) The non-dipped end feels hot.
Question- What causes the circulation of water in the convection experiment?
a) The density of water
b) The heat source
c) The shape of the container
Answer- b) The heat source
Question- In the context of convection, why are coastal houses designed with windows facing the sea?
a) For better views
b) To receive more sunlight
c) To enjoy the cooler sea breeze
Answer- c) To enjoy the cooler sea breeze
Question- Which process is primarily responsible for heat transfer in fluids like water and air?
a) Conduction
b) Convection
c) Radiation
Answer- b) Convection
Question- What role does the potassium permanganate crystal play in the convection experiment?
a) It heats the water.
b) It acts as a colour tracer.
c) It cools the water.
Answer- b) It acts as a colour tracer.
Question- Which of the following is a consequence of convection currents in the air?
a) Sea and land breezes
b) Rising smoke
c) Both a and b
Answer- c) Both a and b
Question- What happens to the air over land during the day in coastal areas?
a) It cools down and sinks.
b) It heats up and rises.
c) It remains constant.
Answer- b) It heats up and rises.
Question- What happens to the air over the land during the day in coastal areas?
a) It cools and sinks.
b) It heats up and rises.
c) It remains constant.
Answer- b) It heats up and rises.
Question- During the night, from where does the cooler breeze primarily originate?
a) From the sea to the land
b) From the land to the sea
c) It remains constant
Answer- b) From the land to the sea
Question- To maximise the benefits of the sea breeze, how are many houses in coastal areas designed?
a) With no windows.
b) With windows facing away from the sea.
c) With windows facing the sea.
Answer- c) With windows facing the sea.
Question- What can happen when heat radiation reaches an object?
a) Reflection
b) Absorption
c) Transmission
d) All of the above
Answer- d) All of the above
Question- What is unique about radiation compared to conduction and convection?
a) Requires a medium
b) Does not require a medium
c) Only occurs in solids
Answer- b) Does not require a medium
Question- Which item is advised to use as a shield against direct sunlight to reduce heat radiation to the body?
a) Sunglasses
b) Umbrella
c) Sunscreen
Answer- b) Umbrella
Question- What do hollow bricks with trapped air layers primarily act as?
a) Decorators
b) Reinforcements
c) Insulators
Answer- c) Insulators
Question- In what weather condition do hollow bricks prevent the escape of warmth from inside the building?
a) Hot weather
b) Cold weather
c) Humid weather
Answer- b) Cold weather
Question- Which benefit does the use of hollow bricks NOT offer?
a) Enhanced external appearance
b) Energy efficiency
c) Comfort
Answer- a) Enhanced external appearance
Question- What does the colour of an object affect in terms of sunlight interaction?
a) Visibility only
b) Its weight
c) How it absorbs or reflects sunlight
Answer- c) How it absorbs or reflects sunlight
Question- Which colour of clothing is suitable to wear in summer to stay cooler?
a) Black
b) Red
c) White
Answer- c) White
Question- What happens to the temperature of water in the black-painted can compared to the white-painted one in the shade?
a) Falls more slowly
b) Increases
c) Remains constant
Answer- a) Falls more slowly
Question- What is the role of air in woollen clothes for winter?
a) Conductor of heat
b) Enhances fashion
c) Acts as an insulator
Answer- c) Acts as an insulator
Question- Wool is considered poor _______.
a) Conductor of heat
b) Insulator
c) Absorber of moisture
Answer- a) Conductor of heat
Question- Why might two thin blankets be warmer than one thick blanket?
a) More fashionable
b) Because of the layer of trapped air between them
c) They are lighter
Answer- b) Because of the layer of trapped air between them
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