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MCQOPTIONS
This section includes 1489 Mcqs, each offering curated multiple-choice questions to sharpen your 8th Class knowledge and support exam preparation. Choose a topic below to get started.
| 351. |
How are microorganisms useful to us? |
| A. | The production of chemical fertilizers |
| B. | The production of fireworks |
| C. | The production of soft drinks |
| D. | The production of antibiotics |
| Answer» E. | |
| 352. |
Which of the following microorganisms causes common cold? |
| A. | Bacteria |
| B. | Virus |
| C. | Protozoa |
| D. | Algae |
| Answer» C. Protozoa | |
| 353. |
How does Entamoeba histolytica enter the human body? |
| A. | Through a mosquito bite |
| B. | Through Bird droppings |
| C. | Through Contaminated food and water |
| D. | Through a Sweat |
| Answer» D. Through a Sweat | |
| 354. |
Which of the following is the characteristic feature that distinguishes an algae from fungi? |
| A. | Heterotrophic |
| B. | Autotrophic |
| C. | Parasitic |
| D. | Sporophytic |
| Answer» C. Parasitic | |
| 355. |
Which of the following fungi have given one of the greatest drugs to the world of medicine? |
| A. | Penicillium notatum |
| B. | Ustilago maydis |
| C. | Colletorichum falcatum |
| D. | Alternaria solani |
| Answer» B. Ustilago maydis | |
| 356. |
Which one of the following is called pond silk? |
| A. | Spirogyra |
| B. | Volvox |
| C. | Chlamydomonas |
| D. | Euglena |
| Answer» B. Volvox | |
| 357. |
Which of the following food components is digested by bacteria living in the intestines of herbivorous animals? |
| A. | Cellulose |
| B. | Proteins |
| C. | Fats |
| D. | Vitamins |
| Answer» B. Proteins | |
| 358. |
Refer to the given figures of bacteria (X, Y and Z) and read the statements (i, ii and iii) regarding them. Based on the given information, identify the bacteria and select the correct option. (i) Bacteria X causes cholera. (ii) Bacteria Y causes a disease which disrupts proper exchange of gases. (iii) Bacteria Z converts lactose sugar of milk into lactic acid. |
| A. | X is Vibrio choleras. |
| B. | Y is Salmonella typhi. |
| C. | Z is Lactobacillus. |
| D. | Both (a) and (c) |
| Answer» E. | |
| 359. |
Which of the following bacteria causes Cholera? |
| A. | Streptococcus |
| B. | Clostridium |
| C. | Pasteurella |
| D. | Vibrio |
| Answer» E. | |
| 360. |
Study the following table and select the correct option for P, Q, R and S. Disease Causative organism Mode of transmission Chicken-pox Virus P Q Bacterium Water/Food Malaria R Mosquito S Virus Water |
| A. | P-Air/contact; Q-Cholera; R-Protozoan; S-Hepatitis B |
| B. | P-Mosquito; Q-Measles; R-Fungi; S-Polio |
| C. | P-Water; 0-Polio; R-Protozoan; S-Hepatitis B |
| D. | P-Air; Q-Typhoid; R-Fungi; S-Measles |
| Answer» B. P-Mosquito; Q-Measles; R-Fungi; S-Polio | |
| 361. |
Identify W, X and Y? |
| A. | (W) (X) (Y) Virus Protozoan Fungus |
| B. | (W) (X) (Y) Algae Bacterium Virus |
| C. | (W) (X) (Y) Virus Fungus Protozoan |
| D. | (W) (X) (Y) Fungus Algae Bacterium |
| Answer» D. (W) (X) (Y) Fungus Algae Bacterium | |
| 362. |
Refer to the given experimental set up as shown in the given figure and select the correct option regarding it. |
| A. | In X, yeast causes fermentation which converts sugar into lactic acid and carbon dioxide. |
| B. | In Y, oxygen gas is released while carbon dioxide gas is absorbed. |
| C. | In Y, lime water turns milky. |
| D. | Both (b) and (c) |
| Answer» D. Both (b) and (c) | |
| 363. |
Which of the following bacteria lives symbiotically in pea plants? |
| A. | Rhizobium |
| B. | Nitrosomonas |
| C. | Azotobacter |
| D. | Clostridium |
| Answer» B. Nitrosomonas | |
| 364. |
Refer to the given outline of \[{{\text{N}}_{\text{2}}}\]cycle. Identify X and Y and select the correct statement regarding this. |
| A. | In the process X, protein is converted into ammonia by the action of bacteria while in the process Y nitrates present in the decaying remains get converted into free nitrogen gas. |
| B. | In the process X, nitrates present in the soil get converted into free nitrogen gas while in the process Y, protein is converted into ammonia by the action of bacteria. |
| C. | Process X represents the conversion of ammonia into nitrates while process Y represents the conversion of nitrates into the free nitrogen gas. |
| D. | Process X represents the conversion of ammonia into nitrites while process Y represents the conversion of complex organic compound like proteins into ammonia. |
| Answer» C. Process X represents the conversion of ammonia into nitrates while process Y represents the conversion of nitrates into the free nitrogen gas. | |
| 365. |
Which of the following can affectively prevent the ringworm disease? |
| A. | Vaccination |
| B. | Vector control |
| C. | Improving personal hygiene |
| D. | Using antibiotics |
| Answer» D. Using antibiotics | |
| 366. |
Refer to the given figures P, Q, R and S. Which of the following statements are correct regarding them?(i) P is the mould from which penicillin is made.(ii) R is considered as connecting link between plants and animals.(iii) Q and S are parasites which live in the bodies of other organisms including human beings.(iv) R and S bear chlorophyll and prepare food is presence of sunlight.(v) S is colonial form of algae. |
| A. | (ii), (iv) and (v) only |
| B. | (i), (ii), (iv) and (v) only |
| C. | (i), (iii) and (iv) only |
| D. | (i), (ii), (iii), (iv) and (v) |
| Answer» B. (i), (ii), (iv) and (v) only | |
| 367. |
Which of the following options is/are true about the diseases, microorganisms which cause them and the symptoms of the diseases? |
| A. | Malaria, Protozoan, Fever and Chills |
| B. | Hepatitis B, Virus, Swollen liver |
| C. | Cholera, Virus, Vomiting, diarrhea |
| D. | Both (A) and (B) |
| Answer» E. | |
| 368. |
Refer to the given passage.The mosquito P is a carrier of virus that spreads a disease Q. Another mosquito R is a carrier of protozoan S that spreads a disease called T.Select the option which correctly identifies P, Q, R, S and T. |
| A. | P-Aedes, Q-Dengue, R-Anopheles, S-Plasmodium, T-Malaria |
| B. | P-Tse tse fly, Q-Dengue, R-Anopheles, S-Plasmodium, T-Malaria |
| C. | P-Aedes, Q-Dengue, R-Tse tse fly, S-Entamoeba, T-Amoebic dysentery |
| D. | P-Tse tse fly, Q-Dengue, R-Aedes, S-Entamoeba, T-Amoebic dysentery |
| Answer» B. P-Tse tse fly, Q-Dengue, R-Anopheles, S-Plasmodium, T-Malaria | |
| 369. |
Identify the disease that is caused by protozoa. |
| A. | Cholera |
| B. | Malaria |
| C. | Jaundice |
| D. | Hepatitis B |
| Answer» C. Jaundice | |
| 370. |
Which of the following disease causing pathogens is / are carried by mosquitoes? |
| A. | Dengue fever |
| B. | Malaria |
| C. | Cholera |
| D. | Both (A) and (B) |
| Answer» E. | |
| 371. |
Match column I with column II and select the correct option from the codes given below. (There can be more than one match for column I.)Column IColumn II(a) Green algae(i) Gelidium(b) Red algae (ii) Chlamydomonas(c) Blue-green algae (iii) Nostoc(d) Brown algae(iv) Polysiphonia (v) Ulothrix (vi) Anabaena (vii) Sargassum (viii) Fucus |
| A. | (a)-(ii, v), (b)-(i, vi),(c)-(iii, iv),(d)-(vii, viii) |
| B. | (a)-(ii, v),(b)-(i, iv),(c)-(iii, vi),(d)-(vii, viii) |
| C. | (a)-(ii, vii),(b)-(i, iv),(c)-(iii, vi),(d)-(v, viii) |
| D. | (a)-(ii, v),(b)-(iii, iv),(c)-(i, vi),(d)-(vii, viii) |
| Answer» C. (a)-(ii, vii),(b)-(i, iv),(c)-(iii, vi),(d)-(v, viii) | |
| 372. |
Which of the following terms is given to the microorganisms that cause diseases? |
| A. | Antigens |
| B. | Antibodies |
| C. | Pathogens |
| D. | Vectors |
| Answer» D. Vectors | |
| 373. |
Read the given passage and select the correct option for X and Y.Microorganisms are used for the large scale production of alcohol, wine and acetic acid. X is used for commercial production of alcohol and wine. The process of conversion of sugar into alcohol is known as Y. |
| A. | X: Streptococcus; Y: Aerobic respiration |
| B. | X: Saccharomyces Y: Fermentation |
| C. | X: Lactobacillus; Y : Fermentation |
| D. | X: Saccharomyces; Y: Aerobic respiration |
| Answer» C. X: Lactobacillus; Y : Fermentation | |
| 374. |
Which of the following is/are produced by using bacteria? |
| A. | Antibiotics |
| B. | Cheese |
| C. | Yoghurt |
| D. | All of these |
| Answer» E. | |
| 375. |
Refer to the given figure showing different steps regarding antibodies fighting against a disease. Arrange them in a correct sequence. |
| A. | (ii) \[\to \] (i) \[\to \] (iii) |
| B. | (i) \[\to \] (ii) \[\to \] (iii) |
| C. | (i) \[\to \] (iii) \[\to \] (ii) |
| D. | (iii) \[\to \] (i) \[\to \] (ii) |
| Answer» B. (i) \[\to \] (ii) \[\to \] (iii) | |
| 376. |
Which of the following is/are the functions performed by the microorganisms in the field of biotechnology? |
| A. | The production of bioplastic |
| B. | The production of hormones |
| C. | Gene therapy |
| D. | Both (B) and (C) |
| Answer» E. | |
| 377. |
Match column I with column II and select the correct option from the codes given below. Column I Column II (a) Apple scab (i) Blue green algae (b) Flagellum (ii) Xanthomonas campestris (c) Nostoc (iii) Spirogyra (d) Tooth Paste (iv) Fungus (e) Multicellular (v) Euglena |
| A. | (a)-(v), (b)-(iv), (c)-(ii), (d)-(i), (e)-(iii) |
| B. | (a)-(ii), (b)-(v), (c)-(i), (d)-(iii), (e)-(iv) |
| C. | (a)-(iv), (b)-(v), (c)-(i), (d)-(ii), (e)-(iii) |
| D. | (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv), (e)-(v) |
| Answer» D. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv), (e)-(v) | |
| 378. |
Study the given correlation. Heat treatment : Sterilisation : : Vaccination : X Here, X refers to |
| A. | Pasteurisation |
| B. | Immunisation |
| C. | Fertilisation |
| D. | Inoculation. |
| Answer» C. Fertilisation | |
| 379. |
What process takes place when yeast is added to grape juice and left for a week? |
| A. | Decomposition |
| B. | Fermentation |
| C. | Distillation |
| D. | Oxidation |
| Answer» C. Distillation | |
| 380. |
Bacteria have been grouped into four different types based on their shapes. Identify the different types and select the correct statement regarding it. |
| A. | Vibrio cholerae is an example of type S, which causes cholera. |
| B. | Lactobacillus is an example of type P, which helps in curdling of milk. |
| C. | Type R bacteria are rod-shaped and are called as bacilli bacteria. |
| D. | Streptococcus is an example of type Q bacteria that causes pneumonia. |
| Answer» B. Lactobacillus is an example of type P, which helps in curdling of milk. | |
| 381. |
Which of the following is the smallest microorganism? |
| A. | Algae |
| B. | Bacterium |
| C. | Protozoan |
| D. | Virus |
| Answer» E. | |
| 382. |
Kanika takes a burning substance and collects the evolved vapours in a test tube, making sure that they do not escape.A small amount of water is added to the test tube. To the solution obtained, a few drops of blue litmus solution are added. The litmus solution turns red. Which of the following could be the burning substance? |
| A. | Mg |
| B. | S |
| C. | Na |
| D. | Fe |
| Answer» C. Na | |
| 383. |
What will happen if you keep a solution of copper sulphate in an iron container for a few days? What is the reason for your observation? |
| A. | The surface of iron container will develop a green layer due to corrosion caused by copper sulphate. |
| B. | Copper metal will be deposited in iron container since copper is more reactive than iron. |
| C. | Nothing will happen since no reaction takes place between copper sulphate and iron. |
| D. | Holes will be formed in the container since iron is more reactive than copper hence iron displaces copper from a solution of copper sulphate. |
| Answer» E. | |
| 384. |
Match column I with column II and select the correct option from the codes given below. Column I Column II A non-metal, essential for respiration (i) Graphite A non-metal, the source of energy in Sun (ii) Silicon A non-metal, good conductor of electricity (iii) Oxygen A non-metal, used in semiconductors (iv) Hydrogen |
| A. | (a) - (iii), (b) - (iv), (c) - (i), (d) - (ii) |
| B. | (a) - (i), (b) - (ii), (c) - (iv), (d) - (iii) |
| C. | (a) - (ii), (b) - (iii), (c) - (i), (d) - (iv) |
| D. | (a) - (iv), (b) - (i), (c) - (ii), (d) - (iii) |
| Answer» B. (a) - (i), (b) - (ii), (c) - (iv), (d) - (iii) | |
| 385. |
Which of the following reactions are possible?(i) \[\text{Mg+CuS}{{\text{O}}_{\text{4}}}\to \text{MgS}{{\text{O}}_{\text{4}}}\text{+Cu}\](ii) \[\text{Ca+MgS}{{\text{O}}_{\text{4}}}\to \text{CaS}{{\text{O}}_{\text{4}}}\text{+Mg}\](iii) \[\text{Cu+ZnS}{{\text{O}}_{\text{4}}}\to \text{CuS}{{\text{O}}_{\text{4}}}\text{+Zn}\](iv) \[\text{Fe+MgS}{{\text{O}}_{\text{4}}}\to \text{FeS}{{\text{O}}_{\text{4}}}\text{+Mg}\] |
| A. | (iii) and (iv) only |
| B. | (i) and (iv) only |
| C. | (ii) and (iii) only |
| D. | (i) and (ii) only |
| Answer» E. | |
| 386. |
Substance X reacts with dilute HCI violently, V reacts slowly while Z does not react at all. X, Y and Z could be respectively |
| A. | Cu, Al, Fe |
| B. | Al, Na, Cu |
| C. | Na, Cu, Fe |
| D. | K, Al, Cu |
| Answer» E. | |
| 387. |
Fill in the blanks with the most appropriate option.'W' is very reactive metal, reacts vigorously with oxygen and water therefore, stored in ___(1)___.'X' is non-metal, soft and dull and forms ___(2)___ oxides with oxygen.'Y' is very reactive ___(3)___, catches fire if exposed to air, therefore, stored in water.'Z' does not react with dilute hydrochloric acid even on heating but it reacts with sulphuric acid. When it is exposed to moist air for long, it acquires a dull ___(4)___ coating. |
| A. | 1 -Water, 2-basic, 3-metal, 4-reddish brown |
| B. | 1-Kerosene, 2-acidic, 3-metal, 4-reddish brown |
| C. | 1-Kerosene, 2-acidic, 3-non-metal, 4-green |
| D. | 1-Water, 2-basic, 3-non-metai, 4-green |
| Answer» D. 1-Water, 2-basic, 3-non-metai, 4-green | |
| 388. |
Materials 'X and 'Y' in the figure are |
| A. | X Y Aluminium foil Pencil lead |
| B. | X Y Pencil lead Copper block |
| C. | X Y Pencil lead Wooden block |
| D. | X Y Copper block Pencil lead |
| Answer» D. X Y Copper block Pencil lead | |
| 389. |
Aditya, a class 8 student investigated the reactivity of four metals, iron, copper, zinc and an unknown metal X. He arranged three experimental set-ups as shown in the diagram and observed the changes carefully. If reactions occur in all the three beakers then, the metal X is |
| A. | Cu |
| B. | Mg |
| C. | Fe |
| D. | Au |
| Answer» C. Fe | |
| 390. |
Observe the given figure carefully. X and Y respectively are |
| A. | Zn and Ag |
| B. | Au and Cu |
| C. | Fe and Cu |
| D. | Zn and Cu |
| Answer» E. | |
| 391. |
The oxide of sulphur (which can be further oxidised) when dissolved in water gives |
| A. | \[{{\text{H}}_{\text{2}}}\text{S}\] |
| B. | \[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{3}}}\] |
| C. | \[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\] |
| D. | \[{{\text{H}}_{\text{2}}}\] |
| Answer» C. \[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\] | |
| 392. |
Read the given passage and fill in the blanks by choosing an appropriate option.Non-metals find wide applications in industries. For example ___i___ is used in electrodes, ___ii___ is used in welding metals, ___iii___ is used to make antiseptic creams while ___iv___ is used as a preservative due to its inert nature. |
| A. | (i)(ii)(iii)(iv) CarbonHydrogenChlorinePhosphorus |
| B. | (i)(ii)(iii)(iv) HydrogenOxygenChlorineNitrogen |
| C. | (i)(ii)(iii)(iv) GraphiteHydrogenSulphurNitrogen |
| D. | (i)(ii)(iii)(iv) PhosphorusSulphurOxygenCarbon |
| Answer» D. (i)(ii)(iii)(iv) PhosphorusSulphurOxygenCarbon | |
| 393. |
Read the given statements and select the correct option. Statement 1: Silver objects become green and lose their shine with the passage of time. Statement 2: Silver reacts with carbon dioxide and moisture present in the atmosphere. |
| 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» E. | |
| 394. |
Read the following statements carefully and identify X, Y and Z respectively. (i) X is stored under kerosene. (ii) Y catches fire on exposure and stored in water. (iii) Z reacts with steam. |
| A. | Na, Mg, Cu |
| B. | Na, P, Fe |
| C. | Cu, Zn, K |
| D. | Zn, Cu, Na |
| Answer» C. Cu, Zn, K | |
| 395. |
Vidisha placed a copper wire in silver nitrate solution as shown in the figure. Which of the following represents the correct observation? |
| A. | The colour of the solution turned blue and precipitate of solid silver was obtained. |
| B. | Colour of solution turned green and copper wire turned blue. |
| C. | There was no change in the colour of solution or colour of the wire. |
| D. | Colour of the solution became silver and there was no change in the colour of copper wire. |
| Answer» B. Colour of solution turned green and copper wire turned blue. | |
| 396. |
Properties of substances W, X, Y and Z are listed below:W: A liquid metalX: A liquid non-metalY: Gaseous non-metalZ: A non-metal which conducts electricity.W, X, Y and Z are respectively |
| A. | Iron, iodine, hydrogen and oxygen |
| B. | Gold, sulphur, chlorine and hydrogen |
| C. | Copper, phosphorus, nitrogen and carbon |
| D. | Mercury, bromine, oxygen and graphite. |
| Answer» E. | |
| 397. |
Most abundunt element upon the earth is _____. |
| A. | Nitrogen |
| B. | Oxygen |
| C. | Silicon |
| D. | Carbon |
| Answer» C. Silicon | |
| 398. |
\[X+4{{H}_{2}}O\xrightarrow{{}}Y+Z\] \[X+S\xrightarrow{{}}R\] 'Y? is the magnetic oxide of iron and 'R? is a grey sulphide. |
| A. | X Y Z K \[Fe\] \[F{{e}_{2}}{{O}_{3}}\] \[{{H}_{2}}\] \[FeS\] |
| B. | X Y Z K \[Fe\] \[F{{e}_{2}}{{O}_{4}}\] \[{{H}_{2}}\] \[FeS\] |
| C. | X Y Z K \[Fe\] \[F{{e}_{3}}{{O}_{3}}\] \[{{O}_{2}}\] \[FeS\] |
| D. | X Y Z K \[Fe\] \[F{{e}_{2}}{{O}_{3}}\] \[{{O}_{2}}\] \[FeS\] |
| Answer» C. X Y Z K \[Fe\] \[F{{e}_{3}}{{O}_{3}}\] \[{{O}_{2}}\] \[FeS\] | |
| 399. |
The correct decreasing order of the reactivity of different metals is : |
| A. | \[K>Na>Mg>Ca>Al>Zn\] |
| B. | \[K>Na>Ca>Mg>Al>Zn\] |
| C. | \[K>Na>Ca>Mg>Zn>Al\] |
| D. | \[K>Na>Mg>Ca>Zn>Al\] |
| Answer» C. \[K>Na>Ca>Mg>Zn>Al\] | |
| 400. |
Metals react with mineral acids to form |
| A. | Salt + Water |
| B. | Salt + Hydrogen |
| C. | Salt + \[HCl\] |
| D. | All |
| Answer» C. Salt + \[HCl\] | |