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