Science TN SB Class VIII

Term – 1

Measurement

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Short Answers

1. What is measurement?
2. Name some common systems of measurement.
3. Define – ampere.
4. What is electric current?
5. What is luminous Intensity?

Detailed Answer

1. List out the base quantities with their units.
2. Write short notes on different types of clocks.

Light

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Matter

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Changes Around us

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Micro Organisms

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Term – II

Heat

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Answer Briefly

1. What are the applications of conduction in our daily life?
2. What are the effects of heat?
3. Name three types of heat transfer
4. What is conduction?
5. Write a note on convection
6. Define specific heat capacity.
7. Define one calorie

Answer in detail

1. With the help of a neat diagram explain the working of a calorimeter
2. Write a note on thermostat
3. Explain the working of thermos flask

High Order Thinking Questions

1. Why does the bottom of a lake not freeze in severe winter even when the surface is all frozen?
2. Which one of the following statements about thermal conductivity is correct? Give reason.

a) Steel > Wood > Water
b) Steel > Water > Wood
c) Water > Steel > Wood
d) Water > Wood > Steel

Problems

1. An iron ball requires 1000 J of heat to raise its temperature by 20°C. Calculate the heat capacity of the ball.
2. The heat capacity of the vessel of mass 100 kg is 8000 J/°C. Find its specific heat capacity.

Electricity

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Answer Briefly

1. How charges are produced by friction?
2. What is Earthing?
3. What is electric circuit?
4. What is electroplating?
5. Give some uses of electroplating.

Answer in detail

1. Explain three ways of charge transfer.
2. What is electroscope? Explain how it works?
3. Explain series and parallel circuit.
4. How lightning takes place?
5. What is electroplating? Explain how it is done.

Give reason for the following

1. When a glass rod is rubbed with silk cloth, both get charged.
2. When a comb is rubbed with dry hair, it attracts small bits of paper.
3. When you touch the metal disc of an electroscope with a charged glass rod the metal leaves get diverged.
4. In an electroscope the connecting rod and the leaves are all metals.
5. One should not use an umbrella while crossing an open field during thunderstorm.

Air

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Air




Answer Briefly

1. What are the sources of oxygen?
2. Mention the physical properties of oxygen.
3. List the uses of nitrogen.
4. Write about reaction of nitrogen with non-metals.
5. What is global warming?
6. What is dry ice? What are its uses?

Answer in Detail

1. What happens when carbon dioxide is passed through lime water? Write the equation for this reaction.
2. Name the compounds produced when the following substances burn in oxygen (a) Carbon (b)Sulphur (c)Phosphorous (d) Magnesium (e)Iron (f)Sodium hydroxide
3. How does carbon dioxide react with the following? (a) Potassium (b) Lime water (c) Sodium hydroxide
4. What are the effects of acid rain? How can we prevent them?

High Order Thinking Questions

1. Soda bottle bursts sometimes when it is opened during summer. Why?
2. It is said that sleeping beneath the tree during night is bad for health. What is the reason?
3. Why does the fish die when it is taken out of water?
4. How do astronauts breathe when they go beyond earth’satmosphere?

Do you know

1. Nowadays nitrogen is used as a substitute for compressed air in tyres. Have you noticed
it? Why do people prefer nitrogen instead of compressed air in tyres?

Atomic Structure

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Answer Briefly

1. State the law of Conservation of mass.
2. State the law of constant proportions.
3. Write the properties of anode rays.
4. Define valency of an element with respect to hydrogen.
5. Define the term ions or radicals.
6. What is chemical equation?
7. Write the names of the following compounds. (a) CO (b)N2O (c)NO2 (d)PCl2

Answer the Following

1. Find the valency of underlined element in formula. (a) NaCl (b) CO2 (c) Al(PO4) (d) Ba(NO3)2 (e) CaCl2
2. Write chemiacal formula of compounds (a)Aluminium sulphate (b)Silver nitrate (c)Magnesium oxide (d)Barium chloride
3. Write skeleton of equation and balanced equation (a) Carbon+Oxygen –> Carbon dioxide (b) Phosphorus + Chlorine–> Phosphorus pentachloride (c) Sulphur + oxygen –> Sulphur dioxide (d)Magnesium+hydrogen chloride–> Magnesium chloride+Hydrogen

High Order Thinking Questions

1. Why does a light paddle wheel placed in the path of cathode rays begin to rotate, when cathode rays fall on it?
2. How can we prove that the electrons carry negative charge?
3. Puthresh. Hari, Kanishka and Thahera collected different samples of water from a well, a pond, a river and underground water. All these samples were sent to a testing laboratory. The test result showed the ratio of hydrogen to oxygen as 1:8. a) What conclusion would you draw from the above experiment? b) Which law of chemical combination does it obey?

Movements

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Answer Very Briefly

1. What is skeleton?
2. What is cranium?
3. Why our backbone is slightly moveable?
4. Differentiate axial and appendicular skeleton.
5. What is ligament?
6. Define Muscle.
7. Differentiate tendons and ligament.

Answer briefly.

1. Differentiate between Movement and Locomotion.
2. Differentiate between Endoskeleton and Exoskleton
3. Differentiate between Pectoral and Pelvic girdle
4. Differentiate between Ball and socket Joint and Hinge Joint
5. Differentiate between Voluntary and Involuntary muscle
6. What are antagonistic muscles? Give one example.
7. How is the skeleton of a bird well-suited for flying?
8. What are the functions of skeleton in human body?

Answer in Detail

1. Name the different types of joints? Give one example for each type.
2. Write about the human axial skeleton, giving suitable labelled diagram.
3. Discuss various types of movements seen in living organisms.
4. What is a streamlined body? How does it help in the movement of animals that fly or swim in water?
5. Write a short note on different types of muscles.

Reaching the ages of Adolescence

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Answer briefly

1. What is adolescence?
2. List out the changes which occur during puberty.
3. What is secondary sex characteristics?
4. What is fertilization?
5. Explain Menarche.
6. Explain the process of pregnancy.
7. Explain the importance of cleanliness during the time of menstrual cycle in girls.
8. How is adolescence differ from childhood?

Answer in detail

1. What are the physical changes that occur in boys and girls during adolescence?
2. Explain the role of hormones in reproduction.
3. Briefly describe the menstrual cycle.
4. Briefly explain the nutritional needs of adolescence.

Higher Order Thinking Questions.

1. What can you suggest to your classmates to keep himself / herself clean and healthy?
2. Adolescence is the energistic stage. What health and good habits you want to develop?


Digital Painting

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Give short answer

1. What is Tux Paint ?
2. What is the use of Text Tool ?
3. What is the Shortcut key for Save option?
4. What is Tux Math?
5. What is the use of Ranger ?
6. What is the use of shapes tool?
7. What is play Arcade Game?
8. Which tool is used to closed Tux Paint window?
9. What is the use of selector?
10. What is help area?
11. What is magic tool?

Answer in detail

1. What are the short keys in computers?

Term – III

Sound

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Answer briefly

1. Question Set 1
2. Question Set 2

Answer in Detail

1. Question Set 1
2. Question Set 2

Problems

1. Question Set 1

Additional Questions

Short Answer

1. Question Set 1
2. Question Set 2

Long Answer

1. Question Set 1

Magnetism

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Answer briefly

1. Question Set 1
2. Question Set 2
3. Question Set 3

Answer in Detail

1. Question Set 1
2. Question Set 2
3. Question Set 3

High Order Thinking Skill

1. Question Set 1

Additional Questions

Short Answer

1. Question Set 1
2. Question Set 2
3. Question Set 3

Universe and Space Science

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Water

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Acids and Bases

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Chemistry in Everyday Life

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Crop Production and Management

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Conservation of Plants and Animals

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Visual Communication

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