Heat and its Measurement
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Concepts of Hot and Cold
SubtopicConcepts of Hot and Cold under Heat and its Measurement for Grade 7 CBSE.
Preview questions (no answers)
- 1.
A laboratory thermometer is generally much ______ than a clinical thermometer.
A.Shorter
B.Longer
C.Thicker
D.Heavier
- 2.
What is the smallest value a clinical thermometer can usually measure on the Celsius scale?
A.B.C.D. - 3.
If you place your hand in lukewarm water after keeping it in ice-cold water, the lukewarm water will feel:
A.Cold
B.Hot
C.Same as ice
D.Freezing
- 4.
Digital thermometers are widely used today because they do not contain:
A.Glass
B.Sensors
C.Mercury
D.Numbers
- 5.
Which of the following can be measured using a clinical thermometer?
A.Temperature of ice cream
B.Temperature of a cup of tea
C.Temperature of a child with a cold
D.Temperature of the oven
- 6.
Before using a clinical thermometer, if the mercury level is above , what should you do?
A.Heat the bulb with a matchstick
B.Give it a few sharp jerks to bring the level down
C.Place it in the freezer
D.Nothing, start measuring directly
- 7.
Which scale of temperature is standardly used for scientific work and starts at absolute zero?
A.Celsius scale
B.Fahrenheit scale
C.Kelvin scale
D.Newton scale
- 8.
Why is the range of a laboratory thermometer usually much larger (e.g., to ) compared to a clinical thermometer?
A.Because laboratories are much bigger than human bodies.
B.Because it needs to measure the boiling and freezing points of various substances, not just body temperature.
C.Because laboratory glass is thicker and can withstand more expansion.
D.Because laboratory thermometers do not use mercury, but a more expansive liquid.
- 9.
What happens to the mercury thread in a clinical thermometer when it is placed in ice-cold water?
A.It stays at the previous reading because the kink prevents it from going down.
B.It immediately drops to because the kink only works for rising temperatures.
C.It contracts into the bulb because the kink is only a one-way valve for expansion.
D.It breaks into several small segments due to rapid cooling.
- 10.
A block of iron and a block of wood are both left in the sun for two hours. Why does the iron feel much hotter?
A.Iron has a higher temperature because it attracts more sunlight.
B.Iron is a conductor that transfers heat to your hand much more rapidly than wood.
C.Wood is a dark color and thus reflects all the heat energy.
D.Iron undergoes a chemical reaction when heated, producing its own heat.
Download the worksheet for Heat and its Measurement - Concepts of Hot and Cold to practice offline. It includes additional chapter-level practice questions.
Clinical and Laboratory Thermometers
SubtopicClinical and Laboratory Thermometers under Heat and its Measurement for Grade 7 CBSE.
Preview questions (no answers)
- 1.
What do we call materials that do not allow heat to pass through them easily?
A.Conductors
B.Insulators
C.Radiators
D.Thermometers
- 2.
What happens to the level of mercury in a laboratory thermometer when it is removed from hot water?
A.It stays at the same level
B.It begins to fall immediately
C.It rises further
D.It changes color
- 3.
To read the clinical thermometer, it is usually kept under the:
A.Feet
B.Tongue
C.Hair
D.Palm
- 4.
The max-min thermometer records the highest and lowest temperatures of:
A.A patient
B.A liquid in a lab
C.The previous day
D.A furnace
- 5.
How long should a clinical thermometer usually be kept in contact with the body to get a stable reading?
A.1 second
B.About 1 minute
C.10 minutes
D.30 minutes
- 6.
Which of these is NOT a correct unit of temperature?
A.Celsius
B.Fahrenheit
C.Kelvin
D.Calorie
- 7.
What does a 'constriction' in a clinical thermometer look like?
A.A wide opening at the top
B.A sharp bend or narrow neck near the bulb
C.A flat surface on the glass
D.A colorful band around the stem
- 8.
What is the physical significance of the temperature usually marked with a red arrow or special symbol on a clinical thermometer?
A.It is the boiling point of human blood.
B.It is the average normal temperature of a healthy human body.
C.It is the temperature at which mercury begins to expand.
D.It is the room temperature where the thermometer is most accurate.
- 9.
If a laboratory thermometer is used to measure the temperature of melting ice, why does the reading stay at even as heat is being applied to the beaker?
A.The thermometer is stuck.
B.The heat is being used to change the state of ice to water (latent heat) rather than raising the temperature.
C.The glass bulb is insulating the mercury from the heat.
D.Mercury does not respond to heat below .
- 10.
In the construction of a thermometer, if the capillary tube is not uniform in diameter, what would be the result?
A.The mercury would not rise at all.
B.The scale graduations would need to be unevenly spaced to be accurate.
C.The mercury would change its boiling point.
D.The glass would shatter when heated.
Download the worksheet for Heat and its Measurement - Clinical and Laboratory Thermometers to practice offline. It includes additional chapter-level practice questions.
Transfer of Heat: Conduction, Convection, and Radiation
SubtopicTransfer of Heat: Conduction, Convection, and Radiation under Heat and its Measurement for Grade 7 CBSE.
Preview questions (no answers)
- 1.
Which of these is NOT a method of heat transfer?
A.Conduction
B.Convection
C.Radiation
D.Expansion
- 2.
In the process of convection, the heated molecules:
A.Vibrate at their fixed positions
B.Move away from the source of heat
C.Do not move at all
D.Turn into solid particles
- 3.
Which of the following statements is true?
A.Heat is a form of energy
B.Temperature and heat are exactly the same thing
C.Heat always flows from cold to hot
D.Only solids can transfer heat
- 4.
Objects that do not allow heat to pass through them easily are called:
A.Conductors
B.Insulators
C.Radiators
D.Absorbers
- 5.
In an experiment, a student heats the upper part of a test tube filled with water while an ice cube is held at the bottom with a weight. The water at the top reaches a temperature of and boils, but the ice at the bottom at does not melt immediately. Which of the following best explains this observation?
A.Convection currents primarily transfer heat upwards, and water is a poor conductor of heat.
B.Water is an excellent conductor of heat, but the glass of the test tube acts as a barrier.
C.The density of water increases as it is heated, preventing the hot water from rising.
D.Heat energy cannot be transferred through liquids unless they are in a solid state.
- 6.
Why is the use of a laboratory thermometer not recommended for measuring human body temperature?
A.It does not have a kink, so the mercury level falls as soon as it is removed from the mouth.
B.Its scale is too small to read the body temperature accurately.
C.The mercury in it is poisonous to humans.
D.It cannot measure temperatures below .
- 7.
The degree of hotness or coldness of an object is called its:
A.Heat
B.Energy
C.Temperature
D.Conduction
- 8.
Why do we feel a 'chill' when we stand in front of a fan on a hot day, even though the fan doesn't actually lower the room temperature?
A.The moving air increases the rate of heat transfer by convection from our skin and speeds up evaporation.
B.The fan removes the radiant heat from our bodies and reflects it to the walls.
C.The fan uses conduction to take heat from the air and give it to the floor.
D.Moving air molecules have lower temperatures than stationary ones.
- 9.
When a hot liquid is poured into a thick glass tumbler, it sometimes cracks. This is because:
A.The inner surface expands rapidly due to heat, while the outer surface stays cool due to poor conduction, creating stress.
B.The glass conducts heat so fast that it vibrates and shatters.
C.The liquid reacts chemically with the glass when heated.
D.The glass surface contracts when it comes into contact with hot liquid.
- 10.
If we heat one end of a paper clip, the other end soon becomes hot. If we do the same with a wooden toothpick, the other end stays cool. This proves that:
A.The rate of conduction is significantly higher in metals than in non-metals like wood.
B.Wood is a better radiator of heat than metal.
C.Metal molecules are larger and carry more heat.
D.Convection only happens in the metal paper clip.
Download the worksheet for Heat and its Measurement - Transfer of Heat: Conduction, Convection, and Radiation to practice offline. It includes additional chapter-level practice questions.
Sea Breeze and Land Breeze
SubtopicSea Breeze and Land Breeze under Heat and its Measurement for Grade 7 CBSE.
Preview questions (no answers)
- 1.
Air that is cooler is generally _____ than air that is warmer.
A.Lighter
B.Denser
C.Faster
D.Thinner
- 2.
When you are at the beach at night, the wind blows towards the sea. This is because:
A.The sea is cooler than the land
B.The land is cooler than the sea
C.The land is hotter than the sea
D.The clouds pull the air
- 3.
Which of these statements is true about land and sea breezes?
A.They occur in deserts
B.They are caused by equal heating
C.They are local winds in coastal areas
D.They only occur in winter
- 4.
What is the primary heat transfer method involved in creating sea breezes?
A.Convection
B.Conduction
C.Radiation
D.Expansion
- 5.
Which of the following would produce the strongest sea breeze?
A.A very hot day on land with very cool sea water
B.A cloudy day with warm sea water
C.A cold night on land with warm sea water
D.A rainy day where land and sea are at the same temperature
- 6.
If you are on a boat near the shore at 4:00 AM, you will likely feel a breeze blowing:
A.In your face (towards the land)
B.From behind you (away from the land)
C.Only in a circular motion
D.There will be no breeze at all
- 7.
During a sea breeze, the cool air that comes from the sea is:
A.Heavier and sinks
B.Lighter and rises
C.Moving at the speed of light
D.Created by the waves
- 8.
During a particularly cloudy day, why is the sea breeze much weaker than on a clear day?
A.Clouds block the wind from moving.
B.Clouds reflect sunlight, preventing the land from reaching a high temperature, thus reducing the pressure difference.
C.Clouds are heavy and push the air down.
D.The sea gets warmer when it is cloudy.
- 9.
A pilot flying a small glider along the coast in the afternoon looks for 'lift'. Where is the pilot most likely to find it?
A.Over the sea where the air is sinking.
B.Over the land where the warm air is rising.
C.In the middle of the transition zone.
D.Deep underwater.
- 10.
Which of the following is a key difference between convection in a pot of water and the convection that causes a sea breeze?
A.Sea breezes only involve air, while pots involve water.
B.The sea breeze convection cell is driven by differential heating of two different surfaces (land and water).
C.Pots use conduction, but the atmosphere only uses radiation.
D.There is no difference.
Download the worksheet for Heat and its Measurement - Sea Breeze and Land Breeze to practice offline. It includes additional chapter-level practice questions.