1. Water is heated in a kettle. The inside water is heated by convection. A person sitting near the fire receives heat by______: Convection
2. A time can come when we will be able to design a machine which can go on working for ever without the expenditure of energy. Is it possible? No
3. The measurement of rainfall is made by an instrument known as______: Rain gauge (also known as an udometer, pluviometer, or an ombrometer)
4. Light year is a unit of______: Distance
5. Three elements needed for the healthy growth of plants are______: N, P, K
6. Copper can be converted into gold by______: Artificial Radioactivity
7. In winter an iron pipe feel colder than a wooden window. This is because wood is______: non-Conductor
8. The echo (reflected sound) will be distinctly heard only at ordinary temperatures if the distance of the reflecting surfaces from the source of sound is at least______: 56fft.
9. It is possible to recognize a person in the dark by simply hearing his unique voice. It is because of the______: Pitch
10. When a ray of sunlight enters a dark room, its straight path become visible because of dust particles hanging in the air. It is because light is______: Visible
11. A six feet tall lady wants to see her full image in a plane mirror. The minimum length of the mirror will be______: 3 feet
12. The principle used in radar is the same as that of Sonar. In radar we use radio waves; whereas in sonar we use______: Ultrasonic
13. In a fission nuclear reaction, a heavy nucleus breaks up into smaller nuclei whereas in another nuclear reaction two or more than two possibly nuclei are fused to form a heavy nucleus. This nuclear reaction is called______: Fusion nuclear reaction
14. Parsec is a unit of______: Distance.
15. German Silver is an alloy of______: Zn + Ni
16. The Continent Antarctica lies at the______: South pole
17. The temperature of the dead body is______: Temperature of the place where it is kept
18. Lactometer is a type of Hydrometer which is used to measure the specific gravity of______: Milk
19. Cusec is a unit of______: Volume flow rate
20. The deepest place on earth is______: Mariana Trench
21. Twinkling of stars is caused by______: Refraction of light
22. Magnifying power of a simple microscope can be increased by______: increasing focal length of the lens
23. Bronze medal is made up of metal______: Copper, Tin
24. One of the countries through which equator passes is______: Kenya
25. A very important practical application of properties of matter is hoeing or "godi" practiced
by the farmers. This property of matter is called______: Capillarity
26. It is observed that the total pressure exerted by air on the man of average size is around 14.7 lb wt. per square inch. But the man feels quite comfortable. It is because of______: Gravity
27. A nuclear reactor is a device used to carry out controlled nuclear reaction whereas GM counter is a device used to detect______ : Nuclear Radiation