MCQOPTIONS
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MCQOPTIONS
This section includes 837 Mcqs, each offering curated multiple-choice questions to sharpen your Grade10 knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
The temperature of the outer mesosphere is |
| A. | 93 °C |
| B. | −93 °C |
| C. | ;5 °C |
| D. | −5 °C |
| Answer» C. ;5 °C | |
| 152. |
Minimum temperature of the troposphere is |
| A. | 17 °C |
| B. | −55 °C |
| C. | −5 °C |
| D. | 1800 °C |
| Answer» C. −5 °C | |
| 153. |
The outer layer of the thermosphere is |
| A. | ionosphere |
| B. | exosphere |
| C. | mesosphere |
| D. | stratosphere |
| Answer» C. mesosphere | |
| 154. |
The energy of sunlight is converted into heat by |
| A. | oxygen only |
| B. | nitrogen only |
| C. | hydrogen |
| D. | oxygen and nitrogen |
| Answer» E. | |
| 155. |
The extension of troposphere above the Earth's surface is |
| A. | 12 km |
| B. | 50 km |
| C. | 80 km |
| D. | 70 km |
| Answer» B. 50 km | |
| 156. |
Presence of which of the following can be felt near the photocopier, television set, microwave oven, etc.? |
| A. | chlorofluorocarbons (chlorofluorocarbons (CFCs)) |
| B. | methane |
| C. | ozone |
| D. | lead compounds |
| Answer» D. lead compounds | |
| 157. |
Which of the following is true about nitric oxide? |
| A. | it is colorless |
| B. | it has an irritating odor |
| C. | it is not toxic |
| D. | it is not harmful |
| Answer» B. it has an irritating odor | |
| 158. |
Which of the following makes up most of the air? |
| A. | nitrogen |
| B. | oxygen |
| C. | carbon dioxide |
| D. | helium |
| Answer» B. oxygen | |
| 159. |
What is the color of ozone? |
| A. | dark blue |
| B. | red |
| C. | pink |
| D. | light blue |
| Answer» E. | |
| 160. |
Which of the following can cause eye irritation in the troposphere? |
| A. | chlorofluorocarbons (CFCs) |
| B. | methane |
| C. | ozone |
| D. | lead compounds |
| Answer» D. lead compounds | |
| 161. |
Which of the following is not true about nitric oxide? |
| A. | it is colorless |
| B. | it is odourless |
| C. | it is toxic |
| D. | it is not harmful |
| Answer» E. | |
| 162. |
Which of the following is the layer of atmosphere in which we live? |
| A. | troposphere |
| B. | stratosphere |
| C. | mesosphere |
| D. | thermosphere |
| Answer» B. stratosphere | |
| 163. |
Which of the following is not true about ozone? |
| A. | it is light blue in colour |
| B. | it has unpleasant odor |
| C. | it is harmful |
| D. | it is not a pollutant |
| Answer» E. | |
| 164. |
Acid rain may have pH as low as |
| A. | 1.1 |
| B. | 2.1 |
| C. | 3.1 |
| D. | 4.1 |
| Answer» C. 3.1 | |
| 165. |
Which of the following contains the maximum amount of ozone? |
| A. | troposphere |
| B. | stratosphere |
| C. | mesosphere |
| D. | thermosphere |
| Answer» C. mesosphere | |
| 166. |
Brilliant light displays called aurora borealis occur in |
| A. | troposphere |
| B. | stratosphere |
| C. | exosphere |
| D. | ionosphere |
| Answer» E. | |
| 167. |
Which of the following saves us from the harmful effects of incoming ultraviolet radiation from the sun? |
| A. | troposphere |
| B. | mesosphere |
| C. | thermosphere |
| D. | ozone |
| Answer» E. | |
| 168. |
Sulphuric acid eats away metals to form |
| A. | water soluble salts only |
| B. | hydrogen only |
| C. | oxygen |
| D. | water soluble salts and hydrogen |
| Answer» E. | |
| 169. |
Which layer is located above the stratosphere |
| A. | mesosphere |
| B. | troposphere |
| C. | ozone |
| D. | none of above |
| Answer» B. troposphere | |
| 170. |
Brilliant light displays occurring in the northern hemisphere due to particles from the sun that enter ionosphere are called |
| A. | stars |
| B. | rainbows |
| C. | aurora borealis |
| D. | none of above |
| Answer» D. none of above | |
| 171. |
What is the functional group of an organic acid called? |
| A. | aldehydes |
| B. | ketones |
| C. | carboxylic acids |
| D. | ethers |
| Answer» D. ethers | |
| 172. |
The reaction rates of organic compounds are often slow due to |
| A. | hydrogen atoms |
| B. | carbon atoms |
| C. | ionic bonding |
| D. | covalent bonding |
| Answer» E. | |
| 173. |
How many main groups are organic compounds classified into based on carbon skeleton? |
| A. | two |
| B. | three |
| C. | four |
| D. | five |
| Answer» B. three | |
| 174. |
The reaction rates of organic compounds are often |
| A. | fast |
| B. | slow |
| C. | normal |
| D. | depends on the compound |
| Answer» C. normal | |
| 175. |
What is the term used for unsaturated hydrocarbons containing at least one carbon-carbon double bond? |
| A. | alkanes |
| B. | alkenes |
| C. | alkynes |
| D. | none of above |
| Answer» C. alkynes | |
| 176. |
As the number of carbon atoms increases, the number of possible isomers |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | becomes zero |
| Answer» B. decreases | |
| 177. |
An alkane with molecular formula C6H14 is called |
| A. | butane |
| B. | pentane |
| C. | hexane |
| D. | heptane |
| Answer» D. heptane | |
| 178. |
How many bonding electrons are present in the valence shell of carbon? |
| A. | two |
| B. | three |
| C. | four |
| D. | five |
| Answer» D. five | |
| 179. |
IUPAC names are also called |
| A. | systematic names |
| B. | hydrocarbon names |
| C. | scientific names |
| D. | class names |
| Answer» B. hydrocarbon names | |
| 180. |
The reaction of halogens (Group-VII) and alkane (saturated hydrocarbons) in the presence of sunlight is an example of |
| A. | carbation |
| B. | halogenation |
| C. | substitution |
| D. | hydrogenation |
| Answer» D. hydrogenation | |
| 181. |
Each Hydrogen atom in an alkane forms |
| A. | one bond |
| B. | two bonds |
| C. | three bonds |
| D. | four bonds |
| Answer» B. two bonds | |
| 182. |
Loss of water is called |
| A. | hydrogenation |
| B. | dehydration |
| C. | halogenation |
| D. | Dehydrohalogenation |
| Answer» C. halogenation | |
| 183. |
The simplest alkane is |
| A. | butane |
| B. | propane |
| C. | methane |
| D. | ethane |
| Answer» D. ethane | |
| 184. |
What is the term used for the process in which there is an addition of nascent hydrogen? |
| A. | hydrogenation |
| B. | dehydration |
| C. | reduction |
| D. | oxidation |
| Answer» D. oxidation | |
| 185. |
The boiling point of LPG is |
| A. | below 20 °C |
| B. | 35 °C to 70 °C |
| C. | 70 °C to 120 °C |
| D. | 170 °C to 250 °C |
| Answer» B. 35 °C to 70 °C | |
| 186. |
The last step of the Solvay process is |
| A. | preparation of ammonical brine |
| B. | carbonation |
| C. | preparation of carbon dioxide and slaked lime |
| D. | recovery of ammonia |
| Answer» E. | |
| 187. |
Number of carbon atoms per molecule in LPG is |
| A. | 1 to 4 |
| B. | 5 to 10 |
| C. | 8 to 12 |
| D. | 10 to 16 |
| Answer» B. 5 to 10 | |
| 188. |
Ore of lead is called |
| A. | galena |
| B. | zinc blende |
| C. | cinnabar |
| D. | chromite |
| Answer» B. zinc blende | |
| 189. |
Which of the following is used as a lubricant for machines and engines? |
| A. | diesel |
| B. | lubricating oil |
| C. | fuel oil |
| D. | bitumen |
| Answer» C. fuel oil | |
| 190. |
What is the extension of the ionosphere above the surface of Earth? |
| A. | 80 km to 400 km |
| B. | 0 km to 12 km |
| C. | 400 km to thousands of kilometer |
| D. | none of above |
| Answer» B. 0 km to 12 km | |
| 191. |
Percentage of krypton in the air is |
| A. | 4ppm |
| B. | 3ppm |
| C. | 2ppm |
| D. | 1ppm |
| Answer» E. | |
| 192. |
Which of the following is closest to the Earth's surface? |
| A. | troposphere |
| B. | stratosphere |
| C. | mesosphere |
| D. | thermosphere |
| Answer» B. stratosphere | |
| 193. |
What is the source of carbon monoxide? |
| A. | incomplete burning of wood |
| B. | fuels |
| C. | exhaust fumes of motor vehicles |
| D. | all of above |
| Answer» E. | |
| 194. |
What is the source of oxides of nitrogen? |
| A. | Powerstations and industries using fossil fuels only |
| B. | exhaust fumes of motor vehicles only |
| C. | incomplete burning of wood |
| D. | Powerstations & industries using fossil fuels and exhaust fumes of motor vehicles |
| Answer» E. | |
| 195. |
The condensed structural formula of Palmitic acid is |
| A. | CH3-CH2-CH2-COOH |
| B. | CH3-(CH2)4-COOH |
| C. | CH3-(CH2)14-COOH |
| D. | CH3-(CH2)16-COOH |
| Answer» D. CH3-(CH2)16-COOH | |
| 196. |
The general formula of Monosaccharides is |
| A. | CnH2n+2 |
| B. | CnH2n |
| C. | CnH2n-2 |
| D. | (CH2o)n |
| Answer» E. | |
| 197. |
In the human diet, all the cholesterol comes from |
| A. | animal products |
| B. | vegetable products |
| C. | minerals |
| D. | beans |
| Answer» B. vegetable products | |
| 198. |
Upon hydrolysis oligosaccharides form |
| A. | 1 to 8 molecules of simple sugars |
| B. | 10 to 12 molecules of simple sugars |
| C. | 5 to 8 molecules of simple sugars |
| D. | 2 to 9 molecules of simple sugars |
| Answer» E. | |
| 199. |
The molecular formula of fructose is |
| A. | C12H22O11 |
| B. | C18H32O16 |
| C. | C6H12O6 |
| D. | C7H14O7 |
| Answer» D. C7H14O7 | |
| 200. |
Starch is an example of? |
| A. | monosaccharides |
| B. | oligosaccharides |
| C. | polysaccharides |
| D. | lipids |
| Answer» D. lipids | |