Q1. The sun appears red at sunrise and sunset while it appears white at noon because of _____.

Q2. The most important stimulant in tea leaves is

Q3. In an oil lamp, the oil rises up in the wick due to _____?

Q4. A lake starts freezing because of the cold atmosphere, It will first freeze

Q5. An iceberg is floating in sea. How much of its mass will remain above the surface of water?

Q6. Heating element of an electric heater is made up of _____?

Q7. A woman’s voice is shriller than a man’s due to _____?

Q8. Liquids that evaporate quickly are known as ________ liquids.

Q9. How many Acres are there in one Hectare?

Q10. The longest and the strongest bone in the human body is _____.

Q11. Vinegar is prepared by the _____.

Q12. The sky appears blue because the earth’s atmosphere _____?

Q13. Ball bearings are used in cycles, scooters etc. to ________.

Q14. Three dimensional image formed by laser is called ________.

Q15. Recording of brain waves from outer surface of head is called _____.

Q16. The Earth takes about _________ to complete one rotation around its axis.

Q17. If a ship travels from fresh water to a sea or ocean, it will:

Q18. The satellites which revolve in such an orbit, so that they move with earth rotation are called:

Q19. Water has maximum density at _____?

Q20. Where is blood formed in the human body?

Q21. When a gas turns into a liquid the process is called:

Q22. For being able to see three- dimensional pictures we have to use

Q23. Which type of Uranium is used in the fission process?

Q24. The absorption of ink by blotting paper involves:

Q25. Plutonium is used as _____.