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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.
| 251. |
The given table has various stages. W - The ovum dies within 24 hours after ovulation. X - The uterus wall thickens with blood vessels. Y - The uterus wall breaks down. Z - The ovary discharges an ovum. Which of these sequence is correct of the menstrual cycle? |
| A. | W, Y, X, Z |
| B. | X, Z, W, Y |
| C. | Y, W, Z, X |
| D. | Z, X, Y, W |
| Answer» C. Y, W, Z, X | |
| 252. |
A Identify the correct sequence that is followed during the growth of human being? 1. Foetus 2. Zygote 3. Embryo 4. Baby 5. Adult 6. Adolescent 7. Child |
| A. | 2, 3, 1, 4, 7, 6, 5. |
| B. | 2, 1, 3, 4, 7, 5, 6. |
| C. | 3, 2, 1, 4, 6, 7, 5. |
| D. | 1, 3, 2, 4, 7, 6, 5. |
| Answer» B. 2, 1, 3, 4, 7, 5, 6. | |
| 253. |
Direction: Answer the questions from 3 based on the graph given below. When does adolescence occur? |
| A. | 0 to 3 years |
| B. | 3 to 13 years |
| C. | 11 to 18 years |
| D. | 18 to 45 years |
| Answer» D. 18 to 45 years | |
| 254. |
Which of the following factors determine the sex of the offspring in humans? |
| A. | Mother's sex chromosomes |
| B. | Father's sex chromosomes |
| C. | Mother's vegetative chromosomes |
| D. | Father's vegetative chromosomes |
| Answer» C. Mother's vegetative chromosomes | |
| 255. |
A Which of the following processes involves the fusion of a male and female gamete? |
| A. | Fertilization |
| B. | Fission |
| C. | Implantation |
| D. | Insemination |
| Answer» B. Fission | |
| 256. |
Arjun kept losing weight even though he was taking his meals regularly. He felt thirsty all the time. When the doctor tested Arjun's urine, the test showed a high concentration of glucose. What disease is Arjun suffering from? |
| A. | Goitre. |
| B. | Cancer. |
| C. | Diabetes mellitus. |
| D. | Cirrohsis of the liver. |
| Answer» D. Cirrohsis of the liver. | |
| 257. |
Which of the following transports hormones from the place of origin to the place of target? |
| A. | Ducts |
| B. | Blood |
| C. | Nerves |
| D. | All of these |
| Answer» C. Nerves | |
| 258. |
Which of the following is called the master gland in the human body? |
| A. | Thyroid |
| B. | Adrenal |
| C. | Islets of Langerhans |
| D. | Pituitary |
| Answer» E. | |
| 259. |
What is the legal age for boys and girls to get married in our country? |
| A. | 18 years for boys, 21 years for girls. |
| B. | 21 years for boys, 18 years for girls. |
| C. | 23 years for boys, 20 years for girls. |
| D. | 25 years for boys, 18 years for girls. |
| Answer» C. 23 years for boys, 20 years for girls. | |
| 260. |
Which chromosomes determine the sex of an individual? |
| A. | Autosomes |
| B. | Allosomes |
| C. | Plasmid |
| D. | Giant chromosomes |
| Answer» C. Plasmid | |
| 261. |
Which of the following hormones initiates metamorphosis in insects? |
| A. | Thyroxine |
| B. | Insulin |
| C. | Growth hormone |
| D. | Adrenaline |
| Answer» B. Insulin | |
| 262. |
Incomplete development of male secondary sexual characteristics is caused due to deficiency in? |
| A. | Estrogen. |
| B. | Progesterone. |
| C. | Adrenaline. |
| D. | Testosterone. |
| Answer» E. | |
| 263. |
Direction: Answer the questions from 2 based on the graph given below. Which of the following represents growth periods labelled as P, Q and R? |
| A. | P - lnfancy, Q-Childhood, R-Old age |
| B. | P - lnfancy, Q-Childhood, R-Adolescence |
| C. | P ? Adulthood, T-Adolescence, R-Old age |
| D. | P-Childhood, Q-lnfancy, R-Adolescence |
| Answer» C. P ? Adulthood, T-Adolescence, R-Old age | |
| 264. |
Which of these hormones is secreted by endocrine gland located on the top of kidneys? |
| A. | Adrenaline |
| B. | Insulin |
| C. | Progesterone |
| D. | Testosterone |
| Answer» B. Insulin | |
| 265. |
Which of the following does not take place during the final stage of the menstrual cycle? |
| A. | Further thickening of the uterine lining. |
| B. | Repair and growth of the uterine lining. |
| C. | Ovulation. |
| D. | Both (B) and (C) |
| Answer» D. Both (B) and (C) | |
| 266. |
Which of the following is/are true of secondary sexual characteristics of boys? |
| A. | Growth of facial hair |
| B. | Development of bones and muscles |
| C. | Production of sperms |
| D. | All of these |
| Answer» E. | |
| 267. |
The menstrual cycle stops in a women at about 50 years old. The woman is said to have reached |
| A. | puberty. |
| B. | menopause. |
| C. | menarche. |
| D. | adolescence. |
| Answer» C. menarche. | |
| 268. |
Why is a diet rich in proteins essential at puberty? |
| A. | For supplying sufficient energy |
| B. | For the formation of new cells during growth |
| C. | the formation of strong bones and teeth |
| D. | protection from diseases |
| Answer» C. the formation of strong bones and teeth | |
| 269. |
In girls, secondary sexual characteristics develop between |
| A. | 9 and 11 years. |
| B. | 11 and 14 years. |
| C. | 15 and 18 years. |
| D. | 19 and 21 years. |
| Answer» C. 15 and 18 years. | |
| 270. |
When do girls overtake boys in height? |
| A. | Childhood |
| B. | Adolescence |
| C. | Adulthood |
| D. | Old age |
| Answer» C. Adulthood | |
| 271. |
Which of the water pollutants is INCORRECTLY paired with the source? |
| A. | Oil spill-ship |
| B. | Pesticide - oil palm plantation |
| C. | Sewage ? factories |
| D. | Nitrate ? farm |
| Answer» D. Nitrate ? farm | |
| 272. |
Heat is reflected from the earth's surface and trapped in the atmosphere. Which phenomena is being referred to? |
| A. | Global warming |
| B. | Ozone depletion |
| C. | Greenhouse effect |
| D. | Thermal pollution |
| Answer» D. Thermal pollution | |
| 273. |
A Which of the following gases can result in the formation of acid rain? |
| A. | Ozone |
| B. | Carbon monoxide |
| C. | Sulphur dioxide |
| D. | Chlorofluorocarbon |
| Answer» D. Chlorofluorocarbon | |
| 274. |
Which one of the following is a source of water pollution? |
| A. | Agricultural waste |
| B. | Domestic waste |
| C. | Industrial waste |
| D. | All the above |
| E. | None of these |
| Answer» E. None of these | |
| 275. |
Read the given statements and select the correct option.Statement 1: Carbon dioxide helps in maintaining temperature of the Earth.Statement 2: Carbon dioxide traps heat of the reflected infrared radiations and stops heat from escaping the Earth's surface. |
| 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 but statement 2 is false. |
| D. | Both statements 1 and 2 are false. |
| Answer» B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. | |
| 276. |
Identify the gas associated with greenhouse effect. |
| A. | Carbon dioxide |
| B. | Oxygen |
| C. | Nitrogen dioxide |
| D. | Sulphur dioxide |
| Answer» B. Oxygen | |
| 277. |
Which one of the following statements is correct? Statement 1: The oxides of nitrogen react with water to form sulphuric acid. Statement 2: The oxides of sulphur react with water to form sulphuric acid. |
| A. | Statement 1 is correct and statement 2 is incorrect. |
| B. | Statement 2 is correct and statement 1 is incorrect. |
| C. | Both the statements 1 and 2 are correct. |
| D. | Both the statements 1 and 2 are incorrect. |
| E. | None of these |
| Answer» C. Both the statements 1 and 2 are correct. | |
| 278. |
Which of the following statements about eutrophication is/are correct? (i) It increases the amount of sunlight reaching the bottom of the water body. (ii) It occurs due to excessive enrichment of the water in river and lakes. (iii) It results in decrease in water clarity, dissolved oxygen and aquatic life. |
| A. | (ii) only |
| B. | (i) and (iii) only |
| C. | (ii) and (iii) only |
| D. | (i), (ii) and (iii) |
| Answer» D. (i), (ii) and (iii) | |
| 279. |
Which of the following is NOT a general pollutant of atmosphere? |
| A. | \[C{{O}_{2}}\] |
| B. | \[S{{O}_{2}}\] |
| C. | \[S{{O}_{3}}\] |
| D. | \[N{{O}_{2}}\] |
| Answer» E. | |
| 280. |
Industrial waste does not include: |
| A. | Nitrates |
| B. | Phosphates |
| C. | Mercury and lead |
| D. | Oxygen |
| E. | None of these |
| Answer» E. None of these | |
| 281. |
The mixture of organic substances obtained from vegetable and animal wastes decomposed by microbes is called: |
| A. | Manure |
| B. | Fertilizers |
| C. | Pesticides |
| D. | Insecticides |
| E. | None of these |
| Answer» B. Fertilizers | |
| 282. |
The layer of atmosphere which absorbs the ultraviolet rays coming from sun is: |
| A. | Exosphere |
| B. | Mesosphere |
| C. | Thermosphere |
| D. | Ozone layer |
| E. | None of these |
| Answer» E. None of these | |
| 283. |
Which of the following is a kind of land pollution in which land becomes unsuitable for farming due to rise in salt content? |
| A. | Carbonization of soil |
| B. | De oxygenation of soil |
| C. | Oxygenation of soil |
| D. | Salinization of soil |
| E. | None of these |
| Answer» E. None of these | |
| 284. |
Which of the following is NOT an air pollutant? |
| A. | \[{{N}_{2}}\] |
| B. | \[{{N}_{2}}O\] |
| C. | \[NO\] |
| D. | \[CO\] |
| Answer» B. \[{{N}_{2}}O\] | |
| 285. |
What are the effects of discharging excess heat from electrical power stations into rivers and lakes? (i) The biological oxygen demand value of the water decreases (ii) Instant death of certain organism (iii) The population of algae increases (iv) The concentration of dissolved oxygen increases |
| A. | Only (i) and (ii) |
| B. | Only (ii) and (iii) |
| C. | Only (i), (ii) and (iii) |
| D. | Only (i),(ii) and (iv) |
| Answer» E. | |
| 286. |
What is the trapping of heat radiations by earth's atmosphere known as? |
| A. | Global warming |
| B. | Marble cancer |
| C. | Greenhouse effect |
| D. | Ozone hole |
| Answer» E. | |
| 287. |
Which one of the following diseases occurs due to water pollution? |
| A. | Cholera |
| B. | Typhoid |
| C. | Jaundice |
| D. | All the above |
| E. | None of these |
| Answer» E. None of these | |
| 288. |
How is sewage water purified for recycling? |
| A. | By the action of fish. |
| B. | By the action of microorganisms. |
| C. | By the action of fuels. |
| D. | By the action of non-biodegradable chemicals. |
| Answer» D. By the action of non-biodegradable chemicals. | |
| 289. |
According to world wide fund for nature, which river is one of the ten most endangered rivers in the world? |
| A. | Mahanadi |
| B. | Brahmaputra |
| C. | Yamuna |
| D. | Ganga |
| E. | None of these |
| Answer» E. None of these | |
| 290. |
What is caused, if carbon dioxide is released into the air? |
| A. | Acid rain |
| B. | Eutrophication |
| C. | Global warming |
| D. | Respiratory problems |
| Answer» E. | |
| 291. |
How can pollution from the burning of fossil fuels be reduced? (i) By using an incinerator. (ii) By using renewable sources of energy. (iii) By fixing catalytic converters in vehicles. |
| A. | Only (i) and (ii) |
| B. | Only (ii) and (iii) |
| C. | Only (i) and (iii) |
| D. | (i), (ii) and (iii) |
| Answer» B. Only (ii) and (iii) | |
| 292. |
Which one of the following methods can be used to remove larger particles of solid impurities from water? |
| A. | Loading |
| B. | Sedimentation |
| C. | Decantation |
| D. | Both [b] and [c] |
| E. | None of these |
| Answer» E. None of these | |
| 293. |
Which of the following does NOT cause air pollution? |
| A. | Increasing forest reserves |
| B. | Using pesticides in farms |
| C. | Developing housing estates |
| D. | Quarrying for limestone |
| Answer» B. Using pesticides in farms | |
| 294. |
What does the term 'conserving the 'environment' mean? |
| A. | Not allowing man and animal from using natural resources |
| B. | Not lowering the quality of the environment |
| C. | Changing natural resources from their original state |
| D. | Preserving nature that has been destroyed |
| Answer» D. Preserving nature that has been destroyed | |
| 295. |
Which of these is the bio-indicator of air pollution? |
| A. | Algae |
| B. | Ferns |
| C. | Mushrooms |
| D. | Lichens |
| Answer» E. | |
| 296. |
Which of the following is due to global warming? (i) An increase in the water level in the sea (ii) The melting of snow on mountain peaks (iii) A decrease in food production by plants |
| A. | Only (i) and (ii) |
| B. | Only (ii) and (iii) |
| C. | Only (i) and (iii) |
| D. | (i), (ii) and (iii) |
| Answer» E. | |
| 297. |
Which of the following, will NOT help in reducing air pollution? |
| A. | Burn household rubbish in incinerators. |
| B. | Use catalytic converters in motor vehicles. |
| C. | Fix electric precipitators to factory chimneys. |
| D. | Ban smoking in public places such as in cinema theatres. |
| Answer» E. | |
| 298. |
In which of the following methods impure water is passed through a semipermeable membrane to remove impurities? |
| A. | Exposure to UV radiation |
| B. | Chlorination |
| C. | Reverse osmosis |
| D. | Boiling |
| E. | None of these |
| Answer» D. Boiling | |
| 299. |
What is the main cause of sulphur dioxide emissions? |
| A. | Agricultural farms |
| B. | Petroleum refineries |
| C. | Thermal Power plants |
| D. | Water resources |
| Answer» D. Water resources | |
| 300. |
Which of the following is not a source of air pollution? |
| A. | Automobile exhaust |
| B. | Burning of firewood |
| C. | Windmill |
| D. | Power plant |
| E. | None of these |
| Answer» D. Power plant | |