Science Class 6th

261. Nitrogen by percentage in air is?

A. 80%

B. 70%

C. 78%

D. 90%

262. Nitrogen is _____ gas.

A. Colorless

B. Ordourless

C. Both ‘a’ and ‘b’

D. None of these

263. Nitrogen is _____ than air.

A. Heavier

B. Lighter

C. None of these

264. Nitrogen is obtained by _____ of air.

A. Hydrogenation

B. Oxygenation

C. Liquefaction

D. None

265. ______ doesn’t support burning.

A. Nitrogen

B. Oxygen

C. Oil

D. None of these

266. Nitrogen slows _____ processes.

A. Burning

B. Rusting

C. Decay

D. All of these

267. ______ Nitrogen is used as a coolant.

A. Solid

B. Gaseous

C. Liquid

D. None

268. Animals use Nitrogen in the form of ______ .

A. Proteins

B. Carbohydrates

C. Fats

D. None

269. Nitrate is used for?

A. Animals

B. Plants

C. None

270. Compounds of Nitrogen are used for .

A. Fertilizers

B. Medicines

C. Both ‘a’ and ‘b’

D. None of these

271. Which is more soluble in water?

A. Oxygen

B. Air

C. Both ‘a’ and ‘b’

D. None of these

272. Oxygen is?

A. Colorless

B. Ordorless

C. Tasteless

D. All of these

273. Oxygen can be separated from air by?

A. Oxygenation

B. Liquifaction

C. Hydrogenation

D. None

274. Oxygen helps in?

A. Decaying

B. Burning

C. Rusting

D. All of these

275. _____ oxygen is used in space shuttle.

A. Solid

B. Liquid

C. Gaseous

D. None

276. _______ fame is used in cutting and welding of metals.

A. Hydrogen

B. Nitrogen

C. Oxyacetylene

D. None

277. Carbon dioxide is?

A. Colorless

B. Ordourless

C. Both ‘a’ and ‘b’

D. None

278. CO2 is _____ soluble in water.

A. Slightly

B. Heavily

C. Lightly

D. Fairly

279. _______ is heavier than air.

A. Nitrogen

B. Carbon dioxide

C. Both ‘a’ and ‘b’

D. None

280. _____ neither burns nor helps in burning.

A. Oxygen

B. CO2

C. None of these