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Science Class 7th

221. In screening process of water treatment plant natural contaminates such as plant, woods etc. are removed.

A) Small

B) Middle

C) Large

D) None of these

Answer
C

222.In coagulation and flocculation process of water treatment plant the removal of_______ particles from water take place.

A) Micro

B) Small

C) Suspended

D) None of these

Answer
C

223. Floc settles to the bottom of the tank containing water due to its weight, this process is called

A) Condensation

B) Boiling

C) Sedimentation

D) None of these

Answer
C

224. Water is used for cleaning, washing, drinking, this is the use of water for purpose.

A) Industrial

B) Agricultural

C) Domestic

D) None of these

Answer
C

225. Water is used as coolant, ingredient, reagent etc, this is the use of water for purpose.

A) Domestic

B) Agricultural

C) Industrial

D) Transportation

Answer
C

226. Water is used for farming, gardening etc. This is the use of water for purpose.

A) Communities

B) Recreational

C) Agricultural

D) None of these

C
C

227. Harmful bacteria are removed from drinking water by passing :

A) Oxygen gas

B) Nitrogen gas

C) Chlorine gas

D) Carbon dioxide gas

Answer
C

228. Suspended particle from the drinking water are removed by :

A) Table salt

B) Chlorine

C) Charcoal

D) Potash alum

Answer
C

229. Distillation is a technique of :

A) Separation

B) Preparation

C) Filtration

D) Disinfection

Answer
A

230. has mass and occupy space.

A) Water

B) Wood

C) Matter

D) Air

Answer
C

231. are the basic building blocks of matter.

A) Molecule

B) Atoms

C) Ions

D) Chemicals

Answer
B

232. The idea that all matter is made up of atoms was proposed by

A) Rutherford

B) Democritus

C) John Walton

D) None of the above

Answer
B

233. The word atom is derived from the greek word

A) Atomic

B) Atomics

C) Atomos

D) None of these

Answer
C

234. Atoms are composed of types of articles.

A) Four

B) Three

C) Two

D) None of these

Answer
B

235. Electron, protons are basic particles of atom.

A) Protonious

B) Electolysis

C) Neutron

D) None of these

Answer
C

236. Most of the atomic mass is comprised of

A) Proton, electron

B) Electron ,neutron

C) Neutron , proton

D) None of these

Answer
C

237. ______ reside in the nucleus.

A) Electron, proton

B) Neutron , proton

C) Neutron, electron

D) None of these

Answer
B

238. Protons have charge

A) Positive

B) Negative

C) Neutral

D) None of these

Answer
A

239. Neutrons have charge

A) Positive

B) Negative

C) No

D) None of these

Answer
C

240. Electrons have charge.

A) Negative

B) Positive

C) No

D) None of these

Answer
A
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