141 Q) If four balloons A, B, C and D are filled with hydrogen, oxygen, helium and nitrogen gases respectively and left in air, which balloon reaches to the highest distance from the Earth?.
(a) Balloon A
(b) Balloon B
(c) Balloon C
(d) Balloon D
142 Q) " Assertion (A) Methane is one of the major GHGs.
Reason (R) Methane has more potential for global warming than carbon dioxide."
(a)Both A and R are true and R is the correct explanation of A
(b)Both A and R are true but R is not the correct explanation of A
(c)A is true but R is false
(d)A is false but R is true
143 Q) Commercially vulcanisation of rubber involves
(a) sulphur
(b)carbon
(c) phosphorus
(d)selenium
144 Q) "Consider the following substances
I. Heavy Water
II. Graphite
Which of the substances given above is/are used as a moderator in a nuclear reactor? "
(a) Only I
(b) Only II
(c) Both I and II
(d) Neither I nor II
145 Q) Which one of the following is used in the preparation of antiseptic solution?
(a)Potassium nitrate
(b)Iodine
(c)Iodine chloride
(d)Potassium chloride
146 Q) Which one of the following enzyme is used to digest gelatine in the process of recovering silver from the photographic film?
(a) Amylase
(b) Pepsin
(c) lipase
(d) None of these
147 Q) Contact lenses are made from
(a) polyvinyl chloride
(b) polystyrene
(c) Teflon
(d) lucite
148 Q) "Now does the 'hypo' used in photography?
"
(a)It acts as a strong reducing agent
(b)It acts as a strong oxidising agent
(c)It removes unreacted AgBr in the form of complex
(d)All of the above
149 Q) When the fats are reacted with alkali, they form ’soaps’. The type of reaction taking place in the formation of soaps is called
(a) emulsification
(b) saponification
(c) halogenation
(d) oxidation
150 Q) The biological specimens in laboratory are preserved in the glass containing formalin. What is the "formalin''?
(a)An aqueous solution of H2S04
(b)An aqueous solution of HNOa
(c)An aqueous solution of formaldehyde
(d)Concentrated solution of HNOa
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2 comments:
Hydrogen is light gas so ans is a reply pls
hydrogen balloons which rise higher because of low density of hydrogen
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