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271-300: MCQs for General Science for Govt. Exams (UPSC and SSC)
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In this lesson, Dr. Roman Saini will discuss the MCQs related to various topics in General Science from Class 6 to Class 8 (Science) NCERT.

Roman Saini is teaching live on Unacademy Plus

Roman Saini
Part of a great founding team at Unacademy with Gaurav, Hemesh. Movies, Guitar, Books, Teaching.

U
Unacademy user
mcqs from 250 to 450 are from which class ncert??
Himanshu Yadav
a year ago
9-10
I would like a little slower speed from you Sir. otherwise wonderful
sir please make videos for other subjects also
  1. Q271. Consider the following: 1. Virus is a micro-organism which can only reproduce inside a host cell. 2. Dysentery, malaria, polio and chicken pox are caused by viruses. 3. The cell membrane of a virus is so small that it is only visible under electronic microscope. Select the correct answer using the code given below A. 1 only B. 2 only C. 1 and 2 only D. All of the above


  2. Solution: A Dysentery and malaria are caused by protozoan. Polio and chickenpox are caused by Viruses. Virus has no cellular structure means no cell wall or cell membrane.


  3. Q272. Consider the following: Assertion (A): There is no vaccine for AIDS Reason (R) The AIDS virus changes its genetic code. Select the correct answer using the code given below: A. Both A and R are true and R is the correct explanation of A. B. Both A and R are true but R is NOT the correct explanation of A. C. A is true but R is false. D. A is false but R is true. E. Both A and R are false


  4. Solution: A A vaccine contains the inactivated germs of the disease. But, the AIDS virus changes its genetic code and therefore, no vaccine has been invented for it.


  5. 273. Which of the following is/are bacterial disease? 1. Kala Azar 2. Diphtheria 3. Common Cold 4. Plague 5. Tetanus Select the correct answer using the code given below: A. 1,2 and 3 only B. 1, 3 and 5 only C. 2, 3 and only D. 2,4 and 5 only


  6. Solution: D 1. Kala Azar- Protozoan 2. Diphtheria- Bacteria Common Cold 3. Common Cold- Virus (Rhinovirus) 4. Plague -Bacteria 5. Tetanus Bacteria


  7. Q274. With reference to micro-organisms, consider the following: 1. Fungi is a unicellular micro-organism. 2. Disease causing micro-organisms are known as Pathogens. 3. Micro-organisms are found in the groups known as colonies because they can't sustain alone 4. Some micro-organisms grow on other organisms while others exist freely. Select the correct answer using the code given below: A. 1 and 2 only B. 2 and 3 only C. 2 and 4 only D. 1, 2 and 3 only


  8. Solution: C Fungi is a multi- cellular micro-organism. Micro-organisms like amoeba can live alone, while fungi and bacteria lives in colonies. So statements 1 and 3 are wrong, hence, C is the right option.


  9. Which of the following is/are true for fungi ? 1. Fungi are eukaryotic organisms. 2. Use decaying organic material as food. 3. Mushrooms are a type of fungi Select the correct answer using the code given below: A. 1 only B. 1 and 2 only C. 2 and 3 only D. 1, 2 and 3


  10. Solution: D Explanation All options are correct.


  11. Q276. Match the following List Disease a) Sleeping sickness b) Plague c) Athlete's Foot d) Dengue Select the correct answer using the code given below: List Cause of the disease 1. Virus 2. Protozoan 3. Bacteria 4. Fungi A. B. C. D. a) b) c) d) 4 2 3 1 2 3 4 1 1 2 4 3 3 2 4 1


  12. Solution: B Athlete's Foot: This common fungal infection is also known as tinea pedis, which causes redness, itching, peeling, blisters, burning, and sores on the foot. Sleeping Sickness: Protozoan Dengue : Virus Plague: Bacteria


  13. Solution: C Insectivorous plants can't make food other than carbohydrates. Statement 2 is right. Insectivorous plants get some part of their energy from trapping and consuming insects. As a rule, however, such animal food, however valuable it might be as a source of certain critically important minerals, is not the plants' major source of energy, which they generally derive mainly from photosynthesis. So, even if these plants can't get insect they can survive, so they are Autotrophs. Hence Statement 1 is wrong. Venus flytrap is an insectivorous plant. Plants contains 20 types of amino acid and amino acids makes protein. Hence Statement 3 is wrong Uso, C is the right option.


  14. 279. Consider the following statements: 1. Fodder crops are crops that are cultivated primarily for livestock feed. 2. Oat is a type of fodder crop. Select the correct answer using the code given below: A. 1 only B. 2 only C. Both 1 and 2 D. Neither 1 nor 2


  15. Solution: D Explanation Just reverse the order to get the right answer. Acute diseases are of short duration, very sever and of recent onset. Chronic diseases have prolonged onset and drastic long-term effects


  16. Q281. Consider the following statements 1. Tuberculosis is a vector borne disease. 2. It is a bacterial disease. 3. Hepatitis B is caused by virus. Select the correct answer using the code given below A. B. C. D. 1 and 2 only 2 and 3 only 1 and 3 only All of the above


  17. Solution: B Tuberculosis is an air-borne disease.


  18. 283. Which of the folwing ts are true for photochemical smog 283. Which of the following is/are true for photochemical smog? 1. Smog is the combination of smoke and fog. 2. Photochemical smog is a type of smog which occurs in warm, dry and sunny climate. 3. The main components of photochemical smog result from action of sunlight on unsaturated hydrocarbons and nitrogen oxides. 4. Photochemical smog has a high concentration of reducing agents. 5. It is also called as reducing smog. Select the correct answer using the code given below: A. 1 and 2 only B. 1, 2 and 3 only C. 1, 2, 3 and 4 only D. All of the above


  19. Q284. Pressure is measured in? A. Pascal B. Newton/cubic meter C. Joule D. Coulomb


  20. Q285. Consider the following about Coal: 1. Anthracite is the best variety of coal. 2. Under high pressure and high temperature, dead plants got slowly converted to coal 3. Bituminous is the lowest variety o coal. 3. Bituminous is the lowest variety of coal Select the correct answer using the code given below A. 1 only B. 2 only C. 1 and 2 D. 1, 2 and 3


  21. Solution: C Peat is lowest variety of coal


  22. 286. Consider the following statements: 1. Sound waves follow the same laws of reflection as the light waves. 2. In stethoscope, the sound of the patient's heartbeat reaches the doctor's ears by multiple reflection of sound. Select the correct answer using the code given below: A. 1 only B. 2 only C. Both 1 and 2 D. Neither 1 nor 2


  23. Solution: C Explanation Both options are correct.


  24. Q288. Consider the following statements Assertion (A): In a cold night, sound is more clear than the hot day and one can hear it from distant sources clearly. Reason (R) The speed of sound wave is more when the temperature is low. Select the correct answer using the code given below: A. Both A and R are true and R is the correct explanation of A B. Both A and R are true but R is NOT the correct explanation of A. C. A is true but R is false. D. A is false but R is true. E. Both A and R are false.


  25. SOLUTION:C Explanation: Graphene is the 200 times more stronger than strongest of the steel and very fine wires can be made out of it. This makes it a potent bullet proof material but it's industrial use as a bullet proof material is still not possible


  26. Q291. Which of the following waves emits from TV remotes? A. Radio waves B. Lasers C. Infrared waves D. Ultrasonic waves


  27. Solution: C Self explanatory


  28. Q294. Consider the following about Nucleus of a cell: 1. Nucleus contains the genetic code. 2. Every cell has one nucleus. Select the correct answer using the code given below: A. 1 only B. 2 only C. Both D. None


  29. Solution: A Self explanatory


  30. Q298. Dry fruits and vegetables are sold in sealed air tight packets to? A. Preserve the aroma B. Prevent from microbes C. Prevent the taste D. Preserve the moisture


  31. Solution: A when in winter, hot water is poured in the glass tumbler, its inner surface tends to expand while the outer surface in contact with cold atmosphere does not. This opposite interaction causes the tumbler to break.