1. The planet of the solar system which has maximum numbers of moon is______: Saturn
2. Sun is a______: Star
3. The age of the solar system is______: 4.5 billion years
4. A unit of length equal to the average distance between the earth and sun is called______: Astronomical Unit
5. An eclipse of the sun occurs when______: The moon is between the sun and the earth
6. The ozone layer protects the earth from ______ sent by the sun______: Ultraviolet
7. The ozone layer is present about 30 miles (50 km) in atmosphere above earth. The stratum (layer) of atmosphere in which ozone layer lies is called______: Stratosphere
8. Which rocks are formed by the alteration of pre-existing rocks by great heat or pressure? Metamorphic rocks
9. The most abundant natural iron oxides are______: Hematite and Magnetite
10. The most abundant elements in sea water are______: Sodium and chloride
11. An electric current can produce______: Chemical effect, Magnetic effect, Heating effect
12. The unit of home electricity energy consumption is______: Kilowatt Hour
13. The magnet always points in the same direction, if move freely i.e. towards North and South poles because of______: Earth is a huge magnet
14. When sound is reflected from floor, ceiling or a wall, it mixes with the original sound and changes its complexion, it is called as______: Reverberation
15. The speed of sound in dry air at 20 C is about______: 330 meters per second
16. The speed of light in vacuum is about_______: 300 Million kilometers per second
17. The time light takes from Sun to reach Earth is______: 8 minutes and 15 seconds
18. Light from Sun travels a distance ______ before it reaches Earth: 150 Million KM
19. The most suitable thermometer for measuring the boiling point of water is______: Mercury thermometer
20. The density of water is greatest at______: 4 C
21. Ice can be changed to water by______: Changing the motion of the water molecules
22. The building blocks of elements are called______: Atoms
23. Boiling of an egg is a change which is______: Chemical
24. The temperature of liquid nitrogen is______: -196 C
25. Which one of the following is an alkali? Slaked lime
26. If an alkali is slowly added to an acidic solution, the pH of the acidic solution will______: Increase
27. The usual raw material for ceramics, generally found beneath the top soil is______: Clay
28. Polyamides are synthetic polymers commonly known as______: Nylon
29. Telephone was invented in 1876 in America by______: Graham Bell
30. Information can be sent over long distances in the form of______: Electrical signals through wires, Light signals through optical fibres
31. Information can be stored in______: Audio and video cassettes, Floppy and compact disks, Hard disks, Laser and optical disks
32. Computers can______: Add, subtract and sort information only
33. IBM stands for______: International Business Machines