Chapter 4 – Heat – Fill in the Blanks with Answers (Solved Worksheet)
Question- Woollen clothes are made from ______ fibres.
Answer- animal
Question- To measure body temperature, we commonly use a ______ thermometer.
Answer- clinical
Question- Handling hot objects like candle flames or hot stoves should be done ______.
Answer- carefully
Question- Before measuring body temperature, the thermometer should be held firmly and ______ gently.
Answer- tapped
Question- The bulb of the thermometer should be placed under the ______ for taking body temperature.
Answer- tongue
Question- Digital thermometers display the temperature ______ on a screen.
Answer- digitally
Question- Before using the thermometer, ensure the mercury level is below ______.
Answer- 35°C
Question- When using a laboratory thermometer, it is crucial to keep it ______ to avoid affecting the accuracy of the reading.
Answer- upright
Question- To get an accurate temperature reading, the bulb of the laboratory thermometer should be ______ by the substance being measured.
Answer- completely surrounded
Question- Heat is a form of ______ that moves from one object to another.
Answer- energy
Question- In the heat transfer experiment, the heat moves along the rod, causing the wax pieces to ______.
Answer- melt and fall
Question- ______ are poor conductors of heat, so they are used as handles in cooking pans.
Answer- Plastic and wood
Question- Materials that do not feel hot at the non-dipped end are ______ of heat.
Answer- insulators
Question- In the experiment, the ______ of the materials are dipped into hot water.
Answer- one end
Question- Materials like aluminium, iron, and copper quickly transfer heat, making them good ______.
Answer- conductors
Question- In convection, hot fluid ______ and cold fluid sinks.
Answer- rises
Question- Convection causes a continuous ______ of fluids due to differences in temperature and density.
Answer- circulation
Question- In coastal areas during the day, the ______ over the land becomes hotter and rises, causing a sea breeze.
Answer- air
Question- In the convection experiment, the ________ water moves down towards the heat source.
Answer- colder
Question- Convection is responsible for the transfer of heat in substances like ________ and air.
Answer- water
Question- The cooler air from the sea replacing the rising warm air creates a ________ during the day in coastal areas.
Answer- sea breeze
Question- The sea breeze brings ________ to the coastal areas during the day.
Answer- relief
Question- Land loses heat ________ after sunset compared to the sea.
Answer- quickly
Question- The ________ breeze is caused by the movement of cooler air from the land towards the sea at night.
Answer- land
Question- Radiation allows heat to move through space, even if there’s no ________ substance in between.
Answer- material
Question- Every hot object or body emits heat energy in the form of ________.
Answer- radiation
Question- When we sit in front of a room heater, we feel warmth through ________.
Answer- radiation
Question- To create trapped layers of air, hollow ________ are used in construction.
Answer- bricks
Question- Hollow bricks resist the entry of external ________ into the building during hot weather.
Answer- heat
Question- Using hollow bricks can reduce the environmental problem ________ by decreasing the use of energy resources.
Answer- impact
Question- Dark colours like black absorb more ________, converting it into heat energy.
Answer- sunlight
Question- In summer, light-coloured clothes ________ sunlight and keep us cool.
Answer- reflect
Question- Dark-coloured clothes in winter help us stay warm by ________ onto heat better.
Answer- holding
Question- Woollen clothes keep us warm because wool is a poor conductor of _______.
Answer- heat
Question- In woollen clothes, tiny air pockets are _______ within the wool fibres.
Answer- trapped
Question- The trapped air in woollen clothes and between blankets acts as a _______.
Answer- insulator
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