CBSE Class 7 Science Heat MCQs

HEAT 

Question. Name the device used for measuring Temperature.  
(a) Thermometer  
(b) Ammeter 
(c) Anemometer  
(d) Ammeter

Answer:  A

Question. The unit of measurement of Temperature is
(a) Meter  
(b) Kilogram  
(c) Degree Celsius  
(d) Second

Answer:  C

Question. The normal temperature of Human body is 
(a) 40 ˚C  
(b) 37 ˚C 
(c) 42 ˚C  
(d) 35 ˚

Answer:  B

Question. The maximum and minimum temperatures of a day are measured with a
(a) Celsius Thermometer  
(b) Fahrenheit Thermometer
(c) Maximum-minimum thermometer 
(d) kelvin Thermometer

Answer:  C

Question. The liquid metal used in a Thermometer is
(a) Mercury 
(b) Silver 
(c) Gold  
(d) Copper 

Answer:  A

Question. What is the use of kink in a Thermometer? 
(a) It prevents mercury level from falling on its own
(b) It raises the mercury level
(c) It makes the Thermometer look beautiful
(d) It acts as a joint to the glass tube that is used for mercury and the scale

Answer:  A

Question. The process by which heat flows from the hotter end to colder end of an object is called 
(a) Conduction  
(b) Convection 
(c) Radiation 
(d) Vaporisation

Answer:  A

Question. The process by which transfer of heat takes place by the actual movement of particles from one part of the body to another part is called 
(a) Conduction 
(b) Convection 
(c) Radiation  
(d) vaporization 

Answer:  B

Question. The transfer of heat which does not require any medium is called 
(a) Conduction  
(b) Convection  
(c) Radiation  
(d) Vaporization

Answer:  C

Question. The process by which heat comes from sun to the earth is
(a) Conduction  
(b) Convection  
(c) Radiation  
(d) Vaporization

Answer:  C

Question. In case of____________ the cool air moves from the land towards the sea  
(a) Land breeze    
(b) sea breeze  
(c) Ice breeze    
(d) sand breeze

Answer:  A

Question. Sunlight reaches the earth’s surface through
(a) convection
(b) radiation
(c) conduction
(d) radio waves

Answer:  B

Question. Which of the following is a insulator
(a) Graphite
(b) Air
(c) Aluminium rod
(d) Copper rod

Answer:  B

Question. Stainless steel pans are usually provided with copper bottom. The reason for this could be that:
(a) copper bottom makes the pan more durable
(b) such pans appear colourful
(c) copper is easier to clean than stainless steel
(d) copper is a better conductor of heat than the stainless steel

Answer:  D

Question. Light coloured clothes are preferred during:
(a) winter
(b) summer
(c) rainy
(d) none of these

Answer:  B

Question. One litre of water at 30°C is mixed with one litre of water at 50°C. The temperature of mixture will be:
(a) 80°C
(b) More than 50°C but less than 80°C
(c) 20°C
(d) Between 30°C and 50°C

Answer:  D

Question. The flow of heat by conduction is generally observed in case of
(a) solids
(b) liquids
(c) gases
(d) All of these

Answer:  A

Question. Name the device which is used to measure the hotness or coldness of an object.
(a) Picometer
(b) Barometer
(c) Manometer
(d) Thermometer

Answer:  D

Question. The correct method of reading a clinical thermometer is:
(a) holding the thermometer by bulb
(b) before use the mercury level should be below 39°C
(c) don’t hold the thermometer by bulb
(d) none of these

Answer:  C

Question. Which thermometer records the highest and lowest temperature during a period of time ?
(a) Clinical thermometer
(b) Laboratory thermometer
(c) Minimum and maximum thermometer
(d) None of these

Answer:  C

Question. Temperature is a measure of the degree of the:
(a) hotness of an object
(b) dryness
(c) coldness of an object
(d) none of these

Answer:  A

Question. Expansion of a substance on heating depends on
(a) nature of the substance
(b) rise in temperature
(c) both A and B
(d) color of the substance

Answer:  C

Question. The substances which conduct heat easily are called:
(a) convection
(b) radiation
(c) conductors
(d) none of these

Answer:  C

Question. Which of the following thermometer contains mercury?
(a) Clinical thermometer
(b) Laboratory thermometer
(c) Both (a) and (b)
(d) None of these

Answer:  C

Question. The phenomenon involved in the formation of land and sea breeze is:
(a) conduction
(b) convection
(c) radiation
(d) all of these

Answer:  B

Question. Which thermometer is used to measure temperature of different things and places ?
(a) Laboratory thermometer
(b) Clinical thermometer
(c) Minimum and maximum thermometer
(d) None of these

Answer:  A

Question. The clinical thermometers presently in use in India are marked with a temperature scale. This scale corresponds to which of the following?
(a) Celsius
(b) Farenheit
(c) Both (a) and (b)
(d) None of these

Answer:  A

Question. Which of the following is a good conductor of heat?
(a) Iron
(b) Steel
(c) Aluminium
(d) All of these

Answer:  D

Question. A marble tile would feel cold as compared to a wooden tile on a winter morning, because the marble tile:
(a) is a better conductor of heat than the wooden tile.
(b) is polished while wooden tile is not polished.
(c) reflects more heat than wooden tile.
(d) is a poor conductor of heat than the wooden tile.

Answer:  A

Question. Metals are conductors of heat.
(a) average
(b) poor
(c) good
(d) some are poor conductors

Answer:  C

Question. Which of the following substance is not a bad conductor of heat ?
(a) Rubber
(b) Aluminium
(c) Glass
(d) Plastic

Answer:  B

Question. Sonu and Ria measured their body temperature Sonu found his to be 98.6°F and Ria recorded 37°C. Which of the following statement is true?
(a) Sonu has a higher body temperature than Ria.
(b) Sonu has a lower body temperature than Ria.
(c) Both have normal body temperature.
(d) Both are suffering from fever.

Answer:  C

Question. What is the SI unit of temperature?
(a) Kelvin
(b) Celsius
(c) Fahrenheit
(d) None of these

Answer:  A

Question. Heat always flows
(a) from a colder object to a hotter object
(b) from a hotter object to a colder object
(c) in both the directions
(d) heat never flows from one object to other

Answer:  B

Question. In solids, heat transfer takes place primarily due to
(a) conduction
(b) convection
(c) radiation
(d) none of these

Answer:  A

Question. Land breeze blows from
(a) lower surface to upper surface
(b) sea to land
(c) upper surface to lower surface
(d) land to sea

Answer:  D

Question. The process of transferring of heat without any contact between the source of heat and the heated object is called
(a) conduction
(b) convection
(c) radiation
(d) induction

Answer:  C

Question. A wooden spoon is dipped in cup of ice-cream, its other end
(a) Does not become cold
(b) Become cold by radiation
(c) Become cold by convection
(d) Become cold by conduction

Answer:  A

Question. The heat is transferred directly from its source to another place without help of any substance in between, without a medium is:
(a) convection
(b) conduction
(c) radiation
(d) none of these

Answer:  C

Question. A device used to measure the temperature is
(a) transistor
(b) thermometer
(c) mercury
(d) none of these

Answer:  B

Question. Which type of cloth is preferred in summer?
(a) Silk clothes
(b) Cotton clothes
(c) Nylon clothes
(d) Polyester clothes

Answer:  B