Class 8 Science Practice Questions

Q1. Which of the following is a metal? 🔬

1. Copper
2. Phosphorus
3. Sulphur
4. Carbon

Q2. The speed of sound in air is approximately? 🔬

1. 330 m/s
2. 3000 m/s
3. 30 m/s
4. 3 × 10⁸ m/s

Q3. Which microorganism causes malaria? 🔬

1. Bacteria
2. Virus
3. Protozoa (Plasmodium)
4. Fungus

Q4. Which property of metals allows them to be drawn into wires? 🔬

1. Lustre
2. Conductivity
3. Ductility
4. Malleability

Q5. Which gas is responsible for the greenhouse effect? 🔬

1. Carbon dioxide
2. Nitrogen
3. Hydrogen
4. Oxygen

Q6. Which type of cell division produces gametes (sex cells)? 🔬

1. Meiosis
2. Binary fission
3. Budding
4. Mitosis

Q7. The loudness of sound is measured in? 🔬

1. Decibel (dB)
2. Metre/second (m/s)
3. Newton (N)
4. Hertz (Hz)

Q8. Coal and petroleum are examples of? 🔬

1. Biomass fuels
2. Nuclear fuels
3. Renewable resources
4. Fossil fuels

Q9. What is the chemical formula of water? 🔬

1. CO₂
2. NaCl
3. H₂O
4. O₂

Q10. Which organ produces insulin in the human body? 🔬

1. Pancreas
2. Kidney
3. Liver
4. Stomach

Q11. Lemon juice is an example of a substance that is:

1. Acidic
2. Basic
3. Neutral
4. Salty

Q12. What is the chemical formula of water?

1. HO₂
2. H₂O
3. H₂O₂
4. OH

Q13. What is the chemical formula of carbon dioxide?

1. CO
2. C₂O
3. CO₂
4. CO₃

Q14. What is the chemical symbol of this element? Oxygen

1. Ox
2. Og
3. On
4. O

Q15. What is the chemical symbol of this element? Hydrogen

1. H
2. Hy
3. Hg
4. He

Q16. What is the chemical symbol of this element? Nitrogen

1. Ni
2. N
3. Na
4. Ne

Q17. What is the chemical symbol of this element? Aluminium

1. Am
2. Au
3. Al
4. Ag

Q18. The change of a liquid into vapour on heating is called:

1. Condensation
2. Respiration
3. Digestion
4. Evaporation