Science Class 6th

221. ______ is used in glass preparation.

A. Silicon

B. Phosphorous

C. Iron

D. Metal

222. Compound is a _____ substance.

A. Impure

B. Pure

C. None of these

223. Mixture is _____ substance.

A. Impure

B. Pure

C. None of these

224. Mixture is formed by _____ combination.

A. Physical

B. Chemical

C. Both ‘a’ and ‘b’

D. None of these

225. Mixture can be separated by _____ means.

A. Chemical

B. Physical

C. Both ‘a’ and ‘b’

D. None of these

226. Sugar solution is a ?

A. Compound

B. Molecule

C. Mixture

D. Ion

227. Ice cream and Tea are?

A. Mixtures

B. Molecules

C. Compounds

D. Ions

228. Brass is an alloy of?

A. Zinc

B. Copper

C. Both ‘a’ and ‘b’

D. None of these

229. Alloys are?

A. Compounds

B. Mixtures

C. Molecules

D. Substances

230. The percentage of Nobel gases in air is?

A. 10%

B. 9%

C. 0.9%

D. 11%

231. In mixture, components _____ original properties.

A. Maintain

B. Lose

C. None of these

232. At high altitude, the percentage of oxygen becomes?

A. Lesser

B. More

C. Increase

D. None of these

233. The component of gases present in air can be separated by?

A. Fractional distillation

B. Chromatography

C. Filtration

D. None of these

234. Burning of fuel is a source of ?

A. Oxygen

B. Nitrogen

C. Carbon dioxide

D. None of these

235. Volcanoes eruption causes ______ production.

A. Oxygen

B. Carbon dioxide

C. Nitrogen

D. All of the above

236. Carbon dioxide is ______ in water.

A. Soluble

B. Insoluble

C. None of these

237. Chalk dust can be separated from water by?

A. Chromatography

B. Filtration

C. Distillation

D. None of these

238. During filtration, the particles left behind on filter paper are called?

A. Filtrate

B. Residue

C. Both ‘a’ and ‘b’

D.None of these

239. The process by which a solid changes directly into gaseous state without passing through liquid state, is called?

A. Filtration

B. Sublimation

C. Distillation

D. None of these

240. Iodine, Ammonium Chloride and Naphthalene can be separated from other solids by?

A. Distillation

B. Sublimation

C. Filtration

D. Chromatography