Kerala Syllabus Class 6 Basic Science - Chapter 02 The Essence of Change - Questions and Answers


Study Notes for Class 6th Basic Science (English Medium) | Text Books Solution Basic Science (English Medium) Chapter 02 മാറ്റത്തിന്റെ പൊരുൾ 

SCERT Solutions for STD VI Basic Science Chapterwise
The Essence of Change - Questions and Answers
1. Different form of energy is
a) Mechanical energy
b) Chemical energy
c) Electrical energy
d) all the above.
Answer: d) all the above.

2. Plants convert solar energy into
a) Mechanical energy
b) Chemical energy
c) Electrical energy
d) none.
Answer: b) Chemical energy

3. All substances contain
a) Mechanical energy
b) Chemical energy
c) Electrical energy
d) none.
Answer: b) Chemical energy

4. Physical properties of a substance are
a) state
b) shape
c) size
d) all the above.
Answer: d) all the above.

5) Physical changes of a substance are
a) Expansion
b) melting
c) breaking
d) tearing
e) all the above.
Answer: e) all the above.

6. ——–is a permanent change.
a) physical change
b) chemical change
c) none.
Answer: b) chemical change

7. What are the forms of energy used for doing the different activities?


8. Riding motor Vehicles, which Form of energy is used?
Answer: Energy from fuels.

9. While operating a mixer grinder, which Forms of energy were used?
Answer: Electrical energy.

10. What are the different forms of energy?
Answer: Heat energy, Light energy, Electrical energy, Sound energy, Mechanical energy, chemical energy etc

11. How Energy can be transformed?
Answer: Energy can be transformed from one form to another.

12. In Bulb Glowing, how Energy conversion takes place?
Answer: Electrical energy changes into light and heat.

13. Is light energy the only form of energy produced when a bulb glows?
Answer: No, Heat energy is also produced along with light energy.

14. What are the forms of energy produced while the bulb was glowing?  Which form of energy among these do we make use of?
Answer: Heat and light energy, Light Energy
15. Different situations are given in the table. Complete the table by identifying the different forms of energy produced in each case and the one we usually make use of.


16. On absorbing heat energy, what changes take place?
Answer: Substances changes the solid-state to the liquid state and then to the gaseous state.

17. On releasing heat energy, what changes take place?
Answer:  substances change the gaseous state to the liquid state and then to the solid state.

18. Which are the forms of energy produced in the following situations?


19. Write down examples of chemical changes?
Answer: The examples are given below:
i) cooked rice tastes sweet when chewed for some time.
ii) the colour of clothes fades when exposed to sunlight.
iii) mangoes ripen.
iv) iron rods rust.

20. Which 1s the form of energy used to operate a mixer grinder?
Answer: Electric energy

21. What is mechanical energy?
Answer: The energy formed when an engine works in turn and machine parts move is called mechanical energy.

22. What is chemical energy?
Answer: The energy contained. in a substance is called chemical energy

23. How do vehicles that run on petrol and diesel depend on the sun for
energy? Haven't you learnt about fossil fuels? Complete the flow chart.


24. How often do we use energy changes in daily life? Let's try to tabulate a few domestic uses of energy.

25. What are the forms of energy we use more often in our daily life?
Answer: Electrical energy, Heat energy, Light energy, Sound energy, Mechanical energy.

26. Complete the flow chart.

27. Note down in the flow chart given below how heat affects the change of state of water.

28. Which among the 3 states has the maximum amount of energy? 
Answer: Steam

29. Examine some of the situations in daily life given in the table.  Analyse the table and find out the peculiarities of the changes. Write them down. Make use of the hints given below.
i. Are new substances formed in any of the above situations?
ii. What are the changes of state that occur?
iii. Which among them involve a change in shape?
iv. Which among them involve a change in size?
Answer:
I. No
ii. Solid ghee, wax and lac melts on heating
iii.  On cutting vegetables, tearing paper and breaking bottle involves a change in shape
iv. PVC pipe is heated, paper is torn, vegetables are cut.
30. What is Physical change?
Answer: Change in the physical properties such as state, shape or size is termed as physical change. 

31. What is a chemical change?
Answer: The process in which substances change into new substances by absorbing or releasing energy is called a chemical change. 

32. The blister caused by steam is more severe than the same caused by
boiling water at the same temperature.
* Do you agree with the statement?
* Justify the statement on the basis of physical change.
Answer: I agree 
The steam has more heat energy than what is present in boiling water. So a blister caused by steam is severe.

33. We know that heat is emitted along with light when a bulb glows.
i. LED lamps are better than filament bulbs for maximum reduction in the consumption of electrical energy. Explain.
ii. Are there situations where filament bulbs are used for producing heat energy? Give examples.
Answer: 
i. Heat is emitted along with light when a bulb glows. But in LEDs heat energy is not formed. So no energy waste is there.
ii. Heat energy from the filament bulb is needed for the hatching of eggs using incubators. So filament lamp is useful in this situation. 

34. Thunder and heavy rain during the monsoon. Rahim and Deepa, who
have learnt about the conservation of energy, are engaged in a game related to it. Let’s take a look at it. When one of them mentions a situation, the other indicates the change of energy involved in it.








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