Sunday, 9 April 2017


1Why the rain drops acquired the spherical shape?Surface tension
2A fountain pen works on the principle of-Capilarism
3The part of transistor which is heavily doped to produce a large number of majority carriers is - 65292Emitter
4Energy stored in a spring in watch -Potential Energy
5What should a person on a freely rotating turn able to decrease his angular speed?72 0Spread his hand outward
6What is the principle of Hydraulic Machines?Pascal
7Electron in an atom contains total energy -Less than Zero
8Mass Energy relation is a conclusion of - Theory of Relativity 
9Weight of a free falling body is -Zero
10Rocket acts on Law of conservation of-Liner Momentum
11Function of ball bearing in a wheel is -to convert kinetic friction into rolling friction
12Which of the following is used as a moderator in nuclear reactor?Graphite
13Which element that does not occur in nature but can be produced artificially?Plutonium
14Which rocks is transformed into marble?Limestone
15By which number the quality of gasoline' sample is determined?By its octane number
16What is the principal reason for the formation of metamorphic rocks?Extreme heat and pressure
17Which type of glass is used for making glass reinforced plastic?Quartz glass
18When temperature is gradually decreased, what is the specific heat of substance?Decreased
19Which metal is non toxic in nature?Gold
20Which is the element that has the highest first ionization potential?Nitrogen
21Which transition metal is in liquid state?Mercury
22Temporary hardness of water is due to the presence of which thing?Magnesium bicarbonate
23Which air pollutant affect the nervous system of man?Lead
24Which oxyacid of halogen has maximum acidic nature?HClO4
25What is the characteristic odour of garlic?A sulphur compound
26What can be the maximum duration of totality for a solar eclipse?7 minutes 40 seconds
27Which of the following is good nuclear fuel?Plutonium-239
28Which is the essential element in all organic compounds?Carbon
29Salts of which element pro vide colours to fireworks?Strontiur and barium
30Leukaemia or blood cancer is characterised by abnormal increase of which cells?White blood cells
31What does Oxidation involve?0 65292Loss of electrons
32In colourful diamond, Why are different colours present?Due to impurities
33What is the number of unpaired electrons in carbon atom?2
34When some detergent is added to water, what will be the surface tension?Increases
35What is reduction of oxide with carbon at high temperature called?Smelting
36Conversion of chemical energy into electrical energy occurs in which thing?Battery
37Purification of petroleum is carried out by which method?Fractional distillation
38Which petroleum refinery product has the lowest boiling point?Gasoline
39Which is purest form of iron?Wrought iron
40Which is used as a coolant in nuclear reactors?Liquid sodium
41What does M3 include?M1 + T.D
42Which part of cinchona plant yields quinine?Bark
43Liquefied Petroleum Gas consists of mainly which gases?Methane, butane and propane
44Which is the secondary source of light in a fluorescent lamp?Mercury vapour
45Which elements is obtained from sea weeds?Iodine
46Which Bacteria convert atmospheric nitrogen into nitrogenous compound?Nitrogen fixing bacteria
47In fireworks, how is the green flame produced?Because of barium
48Water will be absorbed by root hairs, then how is when the external medium?Hypotonic
49Who does a liquid drop tend to assume a spherical shape?Surface tension
50Which substance does not have a melting point?Glass

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