LESSON-5 (Changes Around Us)
Q1. Define fast change, irreversible change?
Q2 .Give different methods of preventing the rusting of iron.
Q3.Why curd cannot be converted back into milk?
Q4 Why sugar becomes brownish black and taste bitter when heated ?
Q5. Why breaking of chalk is a physical change ?
Q6. Give examples for the following types of changes “
- Fast, chemical and irreversible change.
- Fast, physical, irreversible change.
- Formation of biogas from cowdung.
Q8.State whether energy is absorbed or evolved in each of the following changes :
(a) Preparation of food by plants (b) Lightening (c) Volcanic eruptions (d) Vaporizations of alcohol (e) Formation of curd from milk (f) Burning of fuels
Q9. What is meant by pasteurization ? What is the advantage of pasteurization milk?
Q10. Classify the following changes into more than one way :
(a) Melting of glass (b) Tearing of cloth (c) Formation of fruit from flower (d) Spoiling of milk
(e) Moulding of clay (f) Rusting of iron (g) Bursting of crackers
LESSON-8 (Structure and Function of living organisms- Plants)
Q1. What will happen if green plants do not get sunlight ?
Q2. Define the following : (a) Node (b) Internode (c) Pollen grains (d) Ovules
3. In which category of plant potato falls and why?
Q4. Why do some plants trap insects?
Q5. What is bark in plants? What is its functions?
Q6. How does root system prevent soil erosion?
Q7. What is the stem of cactus plant thick and green?
Q8. What is leaf venation? What are its different types?
Q9. What does a seed contains?
Q10. Give the functions of a leaf?
Q11. Why are certain parts of the plants modified?
Q12. What are ornamental plants?
LESSON-9 (Structure and Function of living organisms- Animals)
Q1. A substance `x’ flows from heart into arteries and then into capillaries. It is brought back to the heart by veins. Name the substance `x’.
Q2. What is the special name of the fertilized egg?
Q3. What is the role of hair and mucus on the inner lining of nose in breathing?
Q4. Name the reproductive organs of male and female human. What do these organs produce?
Q5. Who does our tongue helps in digestion?
Q6. Name the various blood groups in human body?
Q7. Which pigment give red colour to blood?
Q8. Name the two main glands associated with alimentary canal.
Q9. Differentiate between arteries and veins?
Q10. Give the main function of the spinal cord.
Q11. Why it is not advisable to breath through mouth?
Q12. Name the various sense organs present in our body and write there functions
Q1. Where is magnetite found ?
Q2 .Why is magnetite known as ‘loadstone’ ?
Q3.Differentiate between natural and man-made magnets ?
Q4.(a) What are electromagnets ? How does it work ? (b) Where are they used ?
Q5. How is the strength of a magnet determined ?
Q6. ‘Our planet earth behaves like a magnet.’ Explain.
Q7. How do you understand by ‘magnetic keepars’ ?
Q8.Why should we not place magnets near a computer or a cell phone ?
Q9. How does a magnet loose its power ?
Q10. Write an activity to show that the magnet is maximum near the poles.
LESSON-14 (Fabric from fibres)
Q1. What do you mean by fabric ?
Q2 .What type of clothes should we wear ?
Q3.Why is fresh soil required every year for growing jute plants ?
Q4. How did the word ‘NYLON’ got its name ?
Q5. Which fibre is called as golden fibre and why ?
Q6. Define the following terms – (a) Fleece (b) Weaving (c) Spinning (d) Cotton bolls
Q7.Which type of soil is required for the growth of coconut trees and why ?
Q8.What is a weaver ?
Q9. Which material is used for making raincoat and why ?
Q10.Why is black soil good for growing cotton ?
LESSON-10 (Work and Energy)
Q1. What is the Principal of Conservation of Energy ?Q2 .Write two uses of solar cells.
Q3.Define (a) Potential Energy (b) Kinetic Energy
Q4. Boil some water in a container covered with a lid. What do you observe ? Give reason.
Q5. How is heat energy useful to us ?
Q6. How is sound produced ?
Q7. What is mechanical energy ?
Q8.What happens when we strike a match stick against a match box ? Give reason also.
Q9. What do you mean by chemical energy ?
Q10. What kind of energy conversion of energy takes place in the following :
Radio (2) Electric bell (3) Electric bulb (4) Torch cell (5) Sitar (6) Geyser (7) Electric train (8) Hydroelectric Dam (9) Cars (10) Wind mill
LESSON-11 (Electric Current and Circuits)
Q1. Write any two advantages of dry cell.
Q2 .Differentiate between primary and secondary cells.
Q3.What are button cells ?
Q4. Why are CFLs recommended by environmentalist ?
Q5. How can we show that air is an insulator ?
Q6. Suggest any four ways by which we can minimize the use of electricity.
Q7. “Electricity is a good servant but a bad master”. Comment.
Q8.Why are inside of electric bulbs filled with inert gases ?
Q9. Why is concave mirror used inside a torch ?
Q10. What does LED stand for ? Why are they preferred over electric bulbs ?
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