1.  Acid rain is due to air pollution by?

a

  Methane

b

 Carbon dioxide

c

 Carbon monoxide

d

 Nitrous oxide and Sulphur dioxide

Answer & Explanation
Answer : Option D

2.  What is extracted from Bauxite?

a

  Tin

b

 Mica

c

 Copper

d

 Aluminium

Answer & Explanation
Answer : Option D

3.  The heat energy produced when the human body metabolises 1 gram of fat is

a

  1 KJ

b

 29 KJ

c

 30 KJ

d

 39 KJ

Answer & Explanation
Answer : Option D

4.  Which have the maximum density?

a

  Ice

b

 Water

c

 Benzene

d

 Chloroform

Answer & Explanation
Answer : Option B

5.  What among following is used to produce artificial rain?

a

  silver iodide

b

 copper oxide

c

 silver nitrate

d

 carbon monoxide

Answer & Explanation
Answer : Option A

6.  The graphite rods in the nuclear reactor

a

  produce neutrons

b

 react with U to release energy

c

 convert fast moving neutrons into thermal neutrons

d

 undergo combustion which triggers the nuclear fission

Answer & Explanation
Answer : Option C

7.  Which is used in preparation of dynamite?

a

  glycol

b

 glycerol

c

 ethyl alcohol

d

 methyl alcohol

Answer & Explanation
Answer : Option B

8.  The nucleus of a hydrogen atom consists of

a

  1 proton only

b

 1 neutron only

c

 1 electron only

d

 1 proton + 2 neutron

Answer & Explanation
Answer : Option A

9.  Who is regarded as father of modern chemistry?

a

  Einstein

b

 Lavoisier

c

 Ruterford

d

 V. Raman

Answer & Explanation
Answer : Option B

10.  The human body is made up of several chemical elements; the element present in the highest proportion (65 %) in the body is

a

  oxygen

b

 carbon

c

 nitrogen

d

 hydrogen

Answer & Explanation
Answer : Option A

11.  Which acid is present in lemon?

a

  citric acid

b

 lactic acid

c

 marlic acid

d

 tartaric acid

Answer & Explanation
Answer : Option A

12.  The oil used in the froth floatation process is

a

  pine oil

b

 olive oil

c

 coconut oil

d

 kerosene oil

Answer & Explanation
Answer : Option A

13.  Which gas is used in fire extinguishers?

a

  Nitrogen oxide

b

 Carbon dioxide

c

 Sulpher dioxide

d

 Carbon monoxide

Answer & Explanation
Answer : Option B

14.  Identify the wrong statement in the following

a

  Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius

b

 Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius

c

 Atomic radius of the elements increases as one moves down the first group of the periodic table

d

 Atomic radius of the elements decreases as one moves across from left to right in the 2nd period

Answer & Explanation
Answer : Option B

15.  The cyclotron is used to

a

  making alloys

b

 purifying metals

c

 separating elements

d

 accelerating particles

Answer & Explanation
Answer : Option D

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