Science Class 7th
201. An animal that feed on plants is called
A) Producer
B) Secondary consumer
C) Primary consumer
D) Decomposer
202. In winter most cold blooded animals disappear because they:
A) Die
B) Hibernate
C) Migrate
D) Eaten away
203. The meat eaters are also known as:
A) Carnivores
B) Omnivores
C) Producers
204. About of the earth surface is covered by water.
A) 70%
B) 60%
C) 75%
D) 80%
205. The first essential requirement for the survival of life is
A) Water
B) Food
C) Air
D) None of these
206. The second essential requirement for the survival of life is
A) Air
B) Food
C) Water
D) None of these
207. Water comprises approximately of the weight of an adult body
A) 50%
B) 60%
C) 75%
D) 66%
208. The main sources of water on earth surface are
A) Glaciers
B) Underground water
C) Atmospheric water
D) All of the above
209. Oceans contain more than of total water
A) 80%
B) 92%
C) 89%
D) 97%
210. Atmosphere contain water as
A) Rain
B) Water vapour
C) Acid rain
211. The fresh needed for human requirements is nearly of the total
A) 0.02%
B) 1%
C) 1.5%
D) 2%
212. Substances that causes water pollution are called
A) Pollutant
B) Pollution
C) Water pollution
D) Option B&C
213. Pollution is mainly caused by sewage.
A) Air pollution
B) Industrial pollution
C) Domestic pollution
D) None of these
214. is the waste derived from homes, school and offices.
A) Pollution
B) Dirty water
C) Sewage
D) None of these
215. The poisonous waste like pesticides and fertilizer are
A) Industrial waste
B) Domestic waste
C) Agricultural waste
D) None of these
216. contains highly toxic compounds of mercury, lead chromium etc.
A) Sewage
B) Agricultural waster
C) Domestic waste
D) Industrial waste
217. Nitrogen and sulphur dissolve in rain water and cause
A) Pollution
B) Air pollution
C) Acid Rain
D) None of these
218. The technique which separate volatile substance from non-volatile substance is called
A) Distillation
B) Fermentation
C) Purification
D) None of these
219. Impure water can be purified by
A) Fermentation
B) Purification
C) Distillation
D) None of these
220. The two basic techniques used in purifications on water are
A) Boiling and cooling
B) Cooling and condensation
C) Boiling and Condensation