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MCQOPTIONS
This section includes 1777 Mcqs, each offering curated multiple-choice questions to sharpen your 9th Class knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
1 mole of methan contain |
| A. | \[\text{6}.0\text{2 }\times \text{ 1}{{0}^{\text{23}}}\text{ atoms of H}\] |
| B. | 4 gram atom of hydrogen |
| C. | \[\text{1}.\text{81 }\times \text{ 1}{{0}^{\text{23}}}\]molecules of methane |
| D. | 3.0 g of carbon |
| Answer» C. \[\text{1}.\text{81 }\times \text{ 1}{{0}^{\text{23}}}\]molecules of methane | |
| 302. |
The Zig-Zag random motion of colloidal particle in a dispersion medium is called |
| A. | Brownian motion |
| B. | Tyndall effect |
| C. | Electrophoresis |
| D. | Electro-osmosis |
| Answer» B. Tyndall effect | |
| 303. |
For ultrafiltration, ordinary filter paper is impregnated in a solution of |
| A. | Collodian |
| B. | Starch |
| C. | Gum |
| D. | Silicic acid |
| Answer» B. Starch | |
| 304. |
When the same amount of zinc metal is treated separately with excess of \[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\]and excess of\[\text{NaOH}\], the ratio of the volumes of \[{{\text{H}}_{\text{2}}}\]evolved is |
| A. | 1 : 1 |
| B. | 1 : 2 |
| C. | 2:1 |
| D. | None of these |
| Answer» B. 1 : 2 | |
| 305. |
How many gms of \[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\]are present m 0.25 mole of \[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\]? |
| A. | 0.25 |
| B. | 25.00 |
| C. | 24.50 |
| D. | 2.45 |
| Answer» D. 2.45 | |
| 306. |
2 g of hydrogen will have same number of molecules as is present in |
| A. | 14 gm of nitrogen |
| B. | \[\text{32 gm of S}{{\text{O}}_{\text{2}}}\] |
| C. | 71 gm of chlorine |
| D. | 24 gm of ozone |
| Answer» D. 24 gm of ozone | |
| 307. |
One mole of \[C{{O}_{2}}\] contains |
| A. | \[\text{6}.0\text{2 }\times \text{ 1}{{0}^{\text{23}}}\] atoms of \[O\] |
| B. | \[\text{6}.0\text{2 }\times \text{ 1}{{0}^{\text{23}}}\text{ atoms of carbon}\] |
| C. | \[\text{18}.\text{1}0\text{ }\times \text{ 1}{{0}^{\text{23}}}\text{ molecules of C}{{\text{O}}_{2}}\] |
| D. | \[\text{3 gm atoms of C}{{\text{O}}_{\text{2}}}\] |
| Answer» C. \[\text{18}.\text{1}0\text{ }\times \text{ 1}{{0}^{\text{23}}}\text{ molecules of C}{{\text{O}}_{2}}\] | |
| 308. |
At higher altitude the boiling point of water lowers because. |
| A. | Atmospheric pressure is low |
| B. | Temperature is low |
| C. | Atmospheric pressure is high |
| D. | None of these |
| Answer» B. Temperature is low | |
| 309. |
The weight of two elements which combine with one another are in the ratio of their |
| A. | Atomic weight |
| B. | Molecular weight |
| C. | Gram mole |
| D. | Equivalent weight |
| Answer» E. | |
| 310. |
Which has maximum number of atoms ? |
| A. | \[\text{24 g of C }\left( \text{12} \right)\] |
| B. | \[\text{56 g of Fe}\left( \text{56} \right)\] |
| C. | \[\text{27 g of Al }\left( \text{27} \right)\] |
| D. | \[\text{1}0\text{8 g of Ag }\left( \text{1}0\text{8} \right)\] |
| Answer» B. \[\text{56 g of Fe}\left( \text{56} \right)\] | |
| 311. |
27 gm aluminium will react completely with |
| A. | 32 gm oxygen |
| B. | 24 gm oxygen |
| C. | 16 gm oxygen |
| D. | 8 gm oxygen |
| Answer» C. 16 gm oxygen | |
| 312. |
A mixture of sand and iodine can be separated by |
| A. | Distillation |
| B. | Fractionation |
| C. | Sublimation |
| D. | Filtration |
| Answer» D. Filtration | |
| 313. |
Number of gm atoms of sulphur present in 80.25 gm of sulphur (At. Wt. of \[S=32\]) |
| A. | 32 |
| B. | 5 |
| C. | 10 |
| D. | 2.5 |
| Answer» E. | |
| 314. |
Brass in an example of a |
| A. | homogeneous compound |
| B. | homogeneous mixture |
| C. | heterogeneous mixture |
| D. | heterogeneous compound |
| Answer» C. heterogeneous mixture | |
| 315. |
The inter particle forces in solid hydrogen are |
| A. | Hydrogen bonds |
| B. | Covalent bonds |
| C. | Co-ordinate bond |
| D. | Vander Waal?s forces |
| Answer» E. | |
| 316. |
Colloidal particles show Tyndall effect due to |
| A. | Scattering of light |
| B. | Reflection of light |
| C. | Refraction of light |
| D. | Polarisation of light |
| Answer» B. Reflection of light | |
| 317. |
The process of making colloidal solution from the precipitate is called |
| A. | coagulation |
| B. | vulcanization |
| C. | peptization |
| D. | flocculation |
| Answer» D. flocculation | |
| 318. |
The mass of one molecule of water is approximately |
| A. | \[3\times {{10}^{-23}}\,g\] |
| B. | 18 g |
| C. | \[\text{1}.\text{5 }\times \text{ 1}{{0}^{-\text{23}}}\text{ g}\] |
| D. | \[\text{4}.\text{5 }\times \text{ 1}{{0}^{-\text{23}}}\text{ g}\] |
| Answer» B. 18 g | |
| 319. |
Correct gas equation is |
| A. | \[\frac{{{V}_{1}}{{T}_{2}}}{{{P}_{1}}}=\frac{{{V}_{2}}{{T}_{1}}}{{{P}_{2}}}\] |
| B. | \[\frac{{{P}_{1}}{{V}_{1}}}{{{P}_{2}}{{V}_{2}}}=\frac{{{T}_{1}}}{{{T}_{2}}}\] |
| C. | \[\frac{{{P}_{1}}{{T}_{2}}}{{{V}_{1}}}=\frac{{{P}_{2}}{{V}_{2}}}{{{T}_{2}}}\] |
| D. | \[\frac{{{V}_{1}}{{V}_{2}}}{{{T}_{1}}{{T}_{2}}}={{P}_{1}}{{P}_{2}}\] |
| Answer» C. \[\frac{{{P}_{1}}{{T}_{2}}}{{{V}_{1}}}=\frac{{{P}_{2}}{{V}_{2}}}{{{T}_{2}}}\] | |
| 320. |
Atoms of the same two elements can combine in different ratios to form different compounds This is |
| A. | law of constant composition |
| B. | law of multiple proportion |
| C. | law of reciprocal proportion |
| D. | law of conservation of mass |
| Answer» C. law of reciprocal proportion | |
| 321. |
If a gas is expanded at constant temperature |
| A. | the pressure increases |
| B. | the kinetic energy of the molecules remains the same |
| C. | the kinetic energy of the molecules decrease |
| D. | the number of molecules of the gas increases |
| Answer» C. the kinetic energy of the molecules decrease | |
| 322. |
Number of atoms in 12 gm of \[_{6}{{\text{C}}^{\text{12}}}\]will be |
| A. | \[6\] |
| B. | 12 |
| C. | \[\text{6}.0\text{2 }\times \text{ 1}{{0}^{\text{23}}}\] |
| D. | \[\text{6 }\times \text{ 6}.0\text{2 }\times \text{ 1}{{0}^{\text{23}}}\] |
| Answer» D. \[\text{6 }\times \text{ 6}.0\text{2 }\times \text{ 1}{{0}^{\text{23}}}\] | |
| 323. |
Read the given statements and select the correct option. Statement 1: Extensive use of fossil fuels possess dual problem it increases air pollution and depletes fuel resources. Statement 2: Fossil fuels release oxides of nitrogen and sulphur on burning which consequently cause acid rain and smog. |
| A. | Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. |
| B. | Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. |
| C. | Statement 1 is true and statement 2 is false. |
| D. | Both statements 1 and 2 are false. |
| Answer» C. Statement 1 is true and statement 2 is false. | |
| 324. |
What causes movement in air? |
| A. | Difference in temperature |
| B. | Difference in pressure |
| C. | Difference in volume |
| D. | Both [a] and [b] |
| Answer» E. | |
| 325. |
Which of these statements are true about air? |
| A. | (i) and (ii) |
| B. | (ii) and (iii) |
| C. | (ii) and (iii) |
| D. | (i), (ii) and (iii) |
| Answer» B. (ii) and (iii) | |
| 326. |
Which of the following activities will not lead to both air and water pollution? |
| A. | Burning of fossil fuels |
| B. | Use of CFCs |
| C. | Use of pesticides in crop fields |
| D. | Setting up of a chemical factory near water body |
| Answer» C. Use of pesticides in crop fields | |
| 327. |
Which of the following is the largest reservoir of carbon? |
| A. | Soil |
| B. | Atmosphere |
| C. | Ocean |
| D. | Sedimentary rocks |
| Answer» D. Sedimentary rocks | |
| 328. |
What kind of pollution is being caused if a factory releases waste products into a nearby stream? |
| A. | Air |
| B. | Noise |
| C. | Water |
| D. | Soil |
| Answer» D. Soil | |
| 329. |
Which of the following reduce(s) air pollution? |
| A. | Only (i) |
| B. | (ii) and (iii) |
| C. | (i) and (iii) |
| D. | (i), (ii) and (iii) |
| Answer» E. | |
| 330. |
Which of the following gases is/are produced by decomposers during the decaying process? |
| A. | Only carbon dioxide gas |
| B. | Only carbon dioxide and nitrogen gases |
| C. | Only oxygen gas |
| D. | Only carbon dioxide and oxygen gases |
| Answer» C. Only oxygen gas | |
| 331. |
How do animals get their nitrogen? |
| A. | By absorbing nitrogen gas through the skin. |
| B. | By eating carbohydrates like sugars and starch. |
| C. | From nitrates in their drinking water. |
| D. | By eating plants and other animals. |
| Answer» E. | |
| 332. |
Which of the following gases is regarded as an atmospheric pollutant? |
| A. | \[{{O}_{2}}\] |
| B. | \[{{O}_{3}}\] |
| C. | \[S{{O}_{2}}\] |
| D. | \[{{N}_{2}}\] |
| Answer» D. \[{{N}_{2}}\] | |
| 333. |
Which of the following plays a major role in replacing oxygen in the atmosphere? |
| A. | Green plants |
| B. | The weathering of rocks |
| C. | Fossil-fuel combustion |
| D. | All of the above |
| Answer» B. The weathering of rocks | |
| 334. |
Which of the following materials of biological origin are commonly used to maintain and improve soil fertility? |
| A. | Green manure |
| B. | Biofertilisers |
| C. | Bioinsecticides |
| D. | Both [a] and [b] |
| Answer» E. | |
| 335. |
Which of the human activity has added the largest amounts of carbon to the atmosphere? |
| A. | Burning fossil fuels |
| B. | Mining fossil fuels |
| C. | Increasing soil erosion |
| D. | Increasing food consumption |
| Answer» B. Mining fossil fuels | |
| 336. |
The figure given below shows part of the carbon cycle. K, L and M are processes that take place in the carbon cycle. Which of the following combinations represents K, L and M correctly? |
| A. | K L M Combustion Respiration Photosynthesis |
| B. | K L M Respiration Decomposition Photosynthesis |
| C. | K L M Decomposition Respiration Decomposition |
| D. | K L M Combustion Decomposition Respiration |
| Answer» E. | |
| 337. |
Which of the following are caused due to the unplanned clearing of land? |
| A. | Only (i), (ii) and (iii) |
| B. | Only (i), (ii) and (iv) |
| C. | Only (i), (iii) and (iv) |
| D. | (i), (ii), (iii) and (iv) |
| Answer» E. | |
| 338. |
What is /are the likely consequences of deforestation? |
| A. | Carbon dioxide in the air increases. |
| B. | Destruction of habitats takes place. |
| C. | Mineral salts in the soil are washed away. |
| D. | All of the above |
| Answer» E. | |
| 339. |
The ores of ____ provide atomic energy. |
| A. | Copper |
| B. | Iron |
| C. | Uranium |
| D. | Both [a] and [b] |
| E. | None of these |
| Answer» D. Both [a] and [b] | |
| 340. |
Which of the following processes provides most of the oxygen found in the earths atmosphere? |
| A. | Photosynthesis |
| B. | Aerobic respiration |
| C. | Excretion |
| D. | Fermentation |
| Answer» B. Aerobic respiration | |
| 341. |
The term "water-pollution" can be defined in several ways. Which of the following statements does not give the correct definition? |
| A. | The addition of undesirable substances to water-bodies |
| B. | The removal of desirable substances from water-bodies |
| C. | A change in pressure of the water bodies |
| D. | A change in temperature of the water bodies |
| E. | None of these |
| Answer» D. A change in temperature of the water bodies | |
| 342. |
Which of the following are essential for the maintenance of balance in the ecosystem? |
| A. | Water cycle |
| B. | Carbon cycle |
| C. | Nitrogen cycle |
| D. | All of these |
| Answer» E. | |
| 343. |
The nitrogen molecules present in air can be converted into nitrates and nitrites by: |
| A. | A biological process of nitrogen fixing bacteria present in soil. |
| B. | A biological process of carbon fixing factor present in soil. |
| C. | Any of the industries manufacturing nitrogenous compounds. |
| D. | The plants used as cereal crops in field. |
| E. | None of these |
| Answer» B. A biological process of carbon fixing factor present in soil. | |
| 344. |
Which one of the following is the most important function of santuaries? |
| A. | Entrap animals |
| B. | Conservation of animals |
| C. | Rearing of animals for obtaining wool |
| D. | All the above |
| E. | None of these |
| Answer» C. Rearing of animals for obtaining wool | |
| 345. |
Which of the following will not cause an environmental pollution? |
| A. | Noise from vehicles |
| B. | The Using of chemical fertilisers |
| C. | Improper disposal of sewage |
| D. | The Using of a CFC free refrigerator |
| Answer» E. | |
| 346. |
Carbon-cycle does not involve: |
| A. | Respiration |
| B. | Photosynthesis |
| C. | Transpiration |
| D. | Burning of fossil fuels |
| E. | None of these |
| Answer» D. Burning of fossil fuels | |
| 347. |
Which of the following processes represents X? |
| A. | Respiration |
| B. | Transpiration |
| C. | Combustion |
| D. | Evaporation |
| Answer» E. | |
| 348. |
The atmosphere of the earth is heated by radiations which are mainly: |
| A. | Radiated by the sun |
| B. | Re-radiated by land |
| C. | Re-radiated by water |
| D. | Re-radiated by land and water |
| E. | None of these |
| Answer» E. None of these | |
| 349. |
Which of the following processes is not a part of water-cycle occuring in nature? |
| A. | Precipitation |
| B. | Transpiration |
| C. | Nitrogen fixation |
| D. | Evaporation |
| E. | None of these |
| Answer» D. Evaporation | |
| 350. |
Which of the following activities increase the concentration of carbon dioxide in the atmosphere? |
| A. | Deforestation |
| B. | Combustion of fuel |
| C. | Over hunting |
| D. | Both [a] and [b] |
| Answer» B. Combustion of fuel | |