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Monday, 23 April 2018

Physical Science - Questions & Answers -1


1. The substance that can be used as a hypnotic:
 Barbituric acid

2. The ‘fixing agent’ used in photograhic film is:
Sodium thiosulphate

3. The maximum concentration of ozone is found in the:
 Stratosphere

4. The Halogen which is used as an antiseptic:
Iodine

5. The lightest noble gas:
Helium

6. Cetane number is used to rate:
Diesel

7. Plaster of Paris is prepared by heating:
Gypsum

8. The heaviest of Alkaline earth metals:
Radium

9. Which metal foil is used for packing chocolates, medicines, cigarettes etc?
Aluminium



10. As per Avogadro’s hypothesis, equal volume of different gases at the same temperature and pressure contain equal number of:
Molecules

11. The element with the largest number of isotopes:
Tin

12. Which property of copper and aluminium makes them suitable for making cooking utensils and boilers?
 High thermal conductivity

13. Silver objects turn dark on prolonged exposure to air due to the formation of: Silver
Sulphide

14. In which type of rocks petroleum is found?
Sedimentary

15. The green coating on the surface of copper objects kept exposed to moist air is due to the formation of:
Basic copper carbonate

16. What is the full form of P.V.C.?
Poly Venyl Chloride

17. Hydrogen in liquid form is used as: 
Rocket fuel

18. In which form cooking gas is supplied cylinders for domestic consumption?
Liquid

19. The process used in dairies to separate cream from milk is:
Centrifugation


20. Radio Carbon dating was discovered by:
Willard Franck Libby

21. Development of unpleasant smell and taste in oil and fat containing food items
due to oxidation of atmospheric oxygen is called:  
Rancidity

22. An anti-oxidant often added to fat containing foods to prevent rancidity:
Butyrated hydroxi anisole

23. The most abundant type of coal:
Bituminous

24. Pigments obtained from plants can be separated by:
Chromatography

25. Which is called the ‘Mother of Pearl’?
Nacre
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