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1. What is the "Optical Phenomenon" in the fringe pattern of CD ?
Ans : Interference.

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2. In which digree Celsius and Fahrenheit show the same temperature ?
Ans : 40

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3. What is Exchange particle in Quark-Quark Interaction?
Ans : Gluon

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4. In which principle the working of a rockets based on ?
Ans : Conservation of momentum

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5.The pollutants which move downward with percolating groundwater are called
Ans : Leachates

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6.Hasdo Valley in Chhattisgarh is famous for
Ans : Coal mines

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7. Special Theory of Relative was proposed in
Ans : 1905

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8.Black hole is an object to be found
Ans : in the sky

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9.IRADIAN is
Ans : 57.3 degree

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10.Fraction of volume of ice seen outside when immersed in water?
Ans : 10.5%

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11. The disease " bronchitis " is associated with:
Ans : Lungs

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12. Which colour indicate Highest Temperature?
Ans : Dull red

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13. Persons sitting in an artificial satellite of the earth have :
Ans : Zero weight

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14. Light Year is
Ans : the distance traveled by light in one year

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15. Liquefied petroleum gas (LPG) is mainly a mixture of
Ans : propane and butane

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16.The Ozone layer lies in the
Ans : Stratosphere

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17. Most of the light rays inside a tube-light is in the form of
Ans : ultra -violet light

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18. Which is the alkalodid that contains in cola drinks?
Ans : Caffeine

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19. The device used for detecting even feeble current:
Ans : Galvanoscope

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20. Anemometer is an instrument used for measuring ?
Ans: Wind speed

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21. Which of the following is the lightest metal ?
(A) Mercury
(B) Silver
(C) Lithium
(D) Lead
Ans : (C) Lithium

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22. The most important ore of Aluminium is —
Ans : Bauxite

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23. The element present in the largest amount in rocks and minerals is —
Ans : Silicon

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24. An alloy used in making heating elements for electric heating devices is —
Ans : Nichrome

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25. German Silver is an alloy of —
Ans : Zinc, Copper & Nickel

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26. Air is a/an —
Ans : Compound

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27. Which of the following is the best conductor of Electricity ?
(A) Ordinary water
(B) Sea water
(C) Boiled water
(D) Distilled water
Ans : (B) Sea water

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28. Balloons are filled with —
Ans : Helium

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29. The charcoal used to decolourise raw sugar is —
Ans : Wood charcoal

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30. The most abundant metal in the earth’s crust is —
Ans : Aluminium

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31. The gas used to extinguish fire is —
Ans : Carbon dioxide

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32. In which of the following activities Silicon Carbide is used ?
(A) Making cement and glass
(B) Disinfecting water and ponds
(C) Making castes for statues
(D) Cutting very hard substances
Ans : (D) Cutting very hard substances

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33. The element common to all acids is —
Ans : Hydrogen

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34. Gobar gas contains mainly —
Ans : Methane

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35. The most malleable metal is —
Ans : Gold

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36. Tetraethyl lead is used as —
Ans : Petrol additive

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37. Which of the following is used in beauty parlours for hair setting ?
(A) Phosphorus
(B) Sulphur
(C) Chlorine
(D) Silicon
Ans : (B) Sulphur

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38. Which of the following is a non-metal that remains liquid in room temperature ?
(A) Bromine
(B) Chlorine
(C) Helium
(D) Phosphorus
Ans : (A) Bromine

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39. From which mineral is radium obtained —
Ans : Pitchblende

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40. What is laughing gas ?
Ans : Nitrous oxide

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41. Which of the following is used as a material for making protective windows in space probes ?
(A) Steel
(B) Graphite
(C) Tungsten
(D) Diamond
Ans : (D) Diamond

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42. Which form of mphosphorus is used in safety metals ?
Ans : Red Phosphorus

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43. Stainless steel is an alloy of —
Ans : Iron, Chromium and Nickel

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44. Which of the following is not correctly matched ?
(A) Galena : Lead Sulphide
(B) Green vitriol : Copper sulphate
(C) Plaster of Paris : Calcium sulphate
(D) Calomel : Mercurous Chloride
Ans : Green vitriol : Copper Sulphate

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45. Which of the following metals forms an amalgum with other metals ?
(A) Lead
(B) Tin
(C) Zinc
(D) Mercury
Ans : (D) Mercury

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