CBSE Class 7 Science Heat Assignment

Read and download free pdf of CBSE Class 7 Science Heat Assignment. Get printable school Assignments for Class 7 Science. Class 7 students should practise questions and answers given here for Chapter 4 Heat Science in Class 7 which will help them to strengthen their understanding of all important topics. Students should also download free pdf of Printable Worksheets for Class 7 Science prepared as per the latest books and syllabus issued by NCERT, CBSE, KVS and do problems daily to score better marks in tests and examinations

Assignment for Class 7 Science Chapter 4 Heat

Class 7 Science students should refer to the following printable assignment in Pdf for Chapter 4 Heat in Class 7. This test paper with questions and answers for Class 7 Science will be very useful for exams and help you to score good marks

Chapter 4 Heat Class 7 Science Assignment

Question. A wet cloth was placed on a balance and left for several days. The change in its mass is shown in the graph below: What was the mass of WATER in the cloth at the start of the experiment?

""CBSE-Class-7-Science-Heat-Assignment

(a) 60g
(b) 36g
(c) 24g
(d) 10g

Answer : B

Question. Identify this instrument.

""CBSE-Class-7-Science-Heat-Assignment-1

(a) Compass
(b) Thermometer
(c) Car tyre pressure indicator
(d) Speedometer

Answer : B

Question. On a warm day, Suraj put a glass of cold water on the table and measured its temperature after every 2 minutes using an accurate thermometer. He made the table given below but forgot to record one reading. The temperature at 10:24 is most likely to be

""CBSE-Class-7-Science-Heat-Assignment-2

(a) 14.5 (oC)
(b) 15.5 (oC)
(c) 16 (oC)
(d) 17 (oC)

Answer : C

Question. When a substance boils, it absorbs energy from the burning fuel. Which of these happens when a moth ball sublimes?
(a) Energy is neither absorbed nor released in the process.
(b) The moth ball absorbs energy from its surroundings
(c) The moth ball releases energy to its surroundings.
(d) The moth ball releases energy specifically to the air around it.

Answer : B

Question. An inventor claims that he has developed a fuel that is non-polluting and can be used as a petrol alternative. Which of these factors is NOT likely to influence its acceptance?
(a) Its performance in independent verification tests.
(b) The extent of change needed in existing car engines.
(c) The cost of the new fuel in comparison to the cost of petrol.
(d) Knowledge of the actual constituents of the new fuel.

Answer : D

Question. In the experiment shown a steel wire is tied to two chairs and kept taut. Two students sit, one on each chair. A weight is attached to the long wire with the help of a string and a pointer is attached to the weight to show the reading. What will happen to the arrow when the candles are lit?

""CBSE-Class-7-Science-Heat-Assignment-3

(a) It will move up
(b) It will move down
(c) It will remain at the same position
(d) It will move up, then down" "

Answer : B

Question. Most substances expand when heated. See the picture of a thermometer before and after being heated slightly. What happens to the mercury and the glass when heated?

""CBSE-Class-7-Science-Heat-Assignment-4

(a) The mercury expands and the glass contracts.
(b) The mercury expands; the glass neither expands nor contracts.
(c) The mercury neither expands nor contracts; the glass contracts.
(d) Both the mercury and the glass expand.

Answer : B

Question. Karuna takes some ice cubes from a freezer and places it in a bowl on a weighing scale. Which of these would show the position after 30 minutes?

""CBSE-Class-7-Science-Heat-Assignment-5

Answer : B

Question. Students in a laboratory are told not to taste any chemicals (even common salt) in the laboratory. What is the MAIN reason?
(a) The chemicals used in the laboratory are not pure.
(b) Chemicals may have got mixed or wrongly labelled.
(c) The chemicals may get spoilt if they are touched.
(d) The chemical may get spoilt if they are touched.

Answer : B

Question. Which of these acids contains nitrogen?
(a) Sulphuric  acid (H2SO4)
(b) Acetic acid (CH3COOH)
(c) Hydrochloric acid (HCl) 
(d) Nitric acid (HNO3)

Answer : D

Question. The  three circles represent three types of substance as indicated. In which region of this figure should common salt be placed?

""CBSE-Class-7-Science-Heat-Assignment-6

(a) P
(b) Q
(c) R
(d) S

Answer : B

Question. The hardness of a mineral represented by letter 'Q' is between
The Mohs Hardness scale represents the hardness of materials. Harder materials correspond to higher numbers in the scale. Harder materials can scratch softer materials. See the table below showing the hardness values of certain materials. Study the flow chart and answer the question.

""CBSE-Class-7-Science-Heat-Assignment-7

(a) 7 and 8
(b) 6.5 and 7
(c) 5.5 and 6.5
(d) 3 and 5.5

Answer : C

Question. Which letter represents the softest mineral?
The Mohs Hardness scale represents the hardness of materials. Harder materials correspond to higher numbers in the scale. Harder materials can scratch softer materials. See the table below showing the hardness values of certain materials. Study the flow chart and answer the question.

""CBSE-Class-7-Science-Heat-Assignment-8

(a) T
(b) S
(c) R
(d) Q

Answer : A

Question. Which of the following will result in a chemical change?
(a) Adding curd to milk
(b) Heating candle wax
(c) Mixing salt and water
(d) Adding water to milk

Answer : A

Question. Brass, an alloy of copper and zinc, is said to be a mixture, not a compound. Why is that?
(a) No new molecule is formed or exists in brass as compared to copper and zinc.
(b) No new molecule is formed or exists in brass as compared to copper and zinc.
(c) It is easy to perfectly separate brass into its constituents - copper and zinc.
(d) A metal cannot react chemically to form a compound with any other element.

Answer : B

 

I. Give one word for the following.

1) The degree of hotness or coldness of a body.

2) Metal used in thermometers.

3) Instrument used to measure temperature of a body.

4) Materials that allow heat to pass through them easily.

5) Materials that do not allow heat to pass through them.

I. Fill in the blanks.

1) Air is a ________ conductor of heat.

2) Solids ________ on cooling.

3) Heat is a form of energy that travels from a _______ object to a _______ object.

4) A spoon kept in a cup of hot tea gets heated by _________

5) The normal body temperature is _______ oC or _____oF.

6) ________ is the best conductor of heat.

7) Ice melts at ______ oC or ______ oF.

8) Water boils at _______oC or ______oF.

9) Black bodies ________ and emit ________ heat the best.

10) The another name of clinical thermometer is __________ thermometer.

II. State true or false.

1) Heat cannot travel in vacuum.

2) Gases expand the most while solids expand the least on heating.

3) Room heaters warm the rooms by conduction.

4) Blankets keep us warm at night in winters.

5) The wooden handle of a pressure cooker prevents conduction of heat to the hand.

III. Match the following.

           A                   B

1) Conduction     a) day

2) Radiation        b) solids

3) Heat                c) night

4) Sea Breeze    d) energy

5) Land Breeze   e) vacuum

IV. Define.

i) Energy

ii) Temperature

iii) Conduction

iv) Convection

v) Radiation

V. Give reasons

i) Evaporation of sweat causes cooling.

ii) Ventilators are provided near the ceiling of a room.

iii) Clinical thermometers have a kink in the capillary tube

VI. Draw the diagram of the following:

i) Sea Breeze

ii) Land Breeze

ACTIVITY- 4.2: To measure the temperature using clinical thermometer. 
 
Question 1- The normal temperature of our body is ……………. 
 
Answer- 37ºC. 
 
Question 2- The clinical thermometer can measure temperature above 45ºC. (T/F) 
 
Answer- False. 
 
ACTIVITY- 4.3: Measurement of temperature of water by using a laboratory thermometer.  
 
Question 1- Thermometer should be held from its bulb. (True/False) 
 
Answer- False. 
 
Question 2- The thermometer should not touch the …………….. of the beaker. 
 
Answer- Bottom or sides. 
 
ACTIVITY- 4.4: Flow of heat through a metal strip.  
 
Question 1- The handle of cooking vessels are good conductor of heat. (True/False) 
 
Answer- False. 
 
Question 2- The handle of electric iron is good conductor of heat. (True/False) 
 
Answer- False. 
 
ACTIVITY- 4.5,4-6: Transfer of heat through liquids and gases.  
 
Question 1- The ventilators in the rooms are used to expel cold air. (True/False) 
 
Answer- False. 
 
Question 2- The liquids are always heated from the bottom. (True/False) 
 
Answer- True. 
 
ACTIVITY- 4.7: Dark colour objects absorb more heat.  
 
Question 1- We wear light coloured clothes in winters. (True/False) 
 
Answer- False. 
 
Question 2- Dark coloured clothes absorb less heat. (True/False) 
 
Answer- False.

 

EXERCISE 
Question 1- Fill In The Blanks. 
 
(i). The hotness of an object is measured by its temperature. 
 
(ii). The mode of heat transfer without any medium is called radiation. 
 
(iii). Air is bad conductor of heat. 
 
(iv). The normal temperature of human body is 37ºC. 
 
 
Question 2- Write True Or False. 
 
(i) Metals are insulators of heat. (False) 
 
(ii) Sea breeze arises due to conduction. (False) 
 
(iii) We get heat from the sun by radiation. (True) 
 
(iv) Wool is good conductor of heat. (False) 
 
(v) Range of clinical thermometer is 35ºC to 42ºC. (True) 
 
 
Question 3- Match The Following : 
 
(i) Land breeze blows during                                  (a) winter 
 
(ii) Sea breeze blows during                                  (b) night 
 
(iii) We prefer light coloured clothes in                  (c) day time 
 
(iv) We prefer dark coloured clothes in                 (d) summer 
 
Ans- (i)- (b), (ii)-(c), (iii)- (d), (iv)-(a)
 
 
 
Question 4. Choose The Correct Answer. 
 
(i). Temperature of human body is: 
 
a) 100ºC
b) 0ºC
c) 37ºC(✓)
d) 98ºC 
 
(ii). Which is bad conductor of heat: 
 
a) Aluminium
b) Iron
c) Copper
d) Wood (✓) 
 
(iii). One litre of water at 30ºC is mixed with one litre of water at 50ºC. Then temperature of mixture will be: 
 
a) 80ºC
b) More than 50ºC but less than 80ºC 
c) 20ºC
d) Between 30ºC and 50ºC (✓) 
 
(iv). A wooden spoon is dipped in a cup of ice-cream. Its other end: 
 
a) becomes cold by the process of conduction
b) becomes cold by the process of convection 
c) becomes cold by the process of radiation
d) Does not become cold (✓) 
 
(v). Land breeze is: 
 
a) Cool air from land to sea (✓)
b) Cool air from sea to land
c) Hot air from land to sea
d) Hot air from sea to land
 
 
Question 5- Short Answer Type Questions.
 
(i) State the condition which determines the direction of flow of heat.
Answer- Heat always flows from hot body (high temperature) to cold body (low temperature).
 
(ii) What is clinical thermometer? Write its range.
Answer- Clinical thermometer is used to measure temperature of human body. Its range is from 35ºC to 42ºC.
 
(iii) What is the use of kink in a clinical thermometer?
Answer- Kink prevents the level of mercury to fall down even after it is taken out of mouth.
 
(iv) What is lab thermometer? Write its range.
Answer- Laboratory thermometer is used to measure temperature of objects other than living bodies. Its range is usually from -10ºC to 110ºC.
 
(v) Why do we prefer dark clothes in winter and light one in summers?
Answer- Dark coloured clothes are better absorbers of heat than the light coloured clothes. So we prefer dark clothes in winter and light one in summers.
 
(vi) Why do we wear woolen clothes in winter?
Answer- Wool has air trapped inside; air is bad conductor of heat. So woolen clothes keep us warm in winters.
 
 
Question 6- Long Answer Type Questions.
 
(i) What are various modes of heat transfer? Explain.
Answer-
(1) Conduction- The process by which heat is transferred from hotter end to the colder end of a sold body without actual movement of particles is known as conduction.
(2) Convection- The process of heat transfer due to actual movement of heated particles is called convection.Liquids and gases get heated by convection.
(3) Radiation-   The process of heat transfer which does not require any medium is known as radiation. Heat of the sun reaches earth by radiation.
 
(ii) Explain the formation of sea breeze and land breeze in coastal areas.
Answer- During day time land gets heated due to sunlight. The air over the land gets heated, expands and rises upwards. The cooler air from the sea rushes towards the coast to take its place due to convection. This moving air is known as sea breeze.
During the night time, exactly the reverse happens. Due to its higher absorption capacity, the water cools down more slowly than the land, so cool air from the land move towards the sea, this moving air is known as land breeze.

Please refer to attached file for Heat CBSE Class 7 Science Heat Assignment

Chapter 05 Acids, Bases and Salts
CBSE Class 7 Science Acids Bases and Salts Assignment
Chapter 10 Respiration in Organisms
CBSE Class 7 Science Respiration in Organisms Assignment
Chapter 14 Electric Current and its Effects
CBSE Class 7 Science Electric Current and its effects Assignment
Chapter 16 Water: A Precious Resource
CBSE Class 7 Science Water A Precious Resource Assignment
Chapter 17 Forests: Our Lifeline
CBSE Class 7 Science Forests Our Lifeline Assignment

CBSE Class 7 Science Chapter 4 Heat Assignment

We hope you liked the above assignment for Chapter 4 Heat which has been designed as per the latest syllabus for Class 7 Science released by CBSE. Students of Class 7 should download and practice the above Assignments for Class 7 Science regularly. We have provided all types of questions like MCQs, short answer questions, objective questions and long answer questions in the Class 7 Science practice sheet in Pdf. All questions have been designed for Science by looking into the pattern of problems asked in previous year examinations. You can download all Revision notes for Class 7 Science also absolutely free of cost. Lot of MCQ questions for Class 7 Science have also been given in the worksheets and assignments for regular use. All study material for Class 7 Science students have been given on studiestoday. We have also provided lot of Worksheets for Class 7 Science which you can use to further make your self stronger in Science.

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How many topics are covered in Chapter 4 Heat Science assignments for Class 7

All topics given in Chapter 4 Heat Science Class 7 Book for the current academic year have been covered in the given assignment

Is there any charge for this assignment for Chapter 4 Heat Science Class 7

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Are these assignments for Chapter 4 Heat Class 7 Science designed as per CBSE curriculum?

Latest syllabus issued for current academic year by CBSE has been used to design assignments for Chapter 4 Heat Class 7

Are there solutions or answer keys for the Class 7 Science Chapter 4 Heat assignments

Yes, we have provided detailed answers for all questions given in assignments for Chapter 4 Heat Class 7 Science