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225-240: 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.

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mam aapka lecture sunke test clear karne ka confidence to increase Hota h
Mercalli scale will measure the intensity of earthquake and Richter scale is used to measure magnitude of earthquake.
allmost all of them were moderate for science student.... but following unacademy made them very easy and 100 percent answerable..... without unacademy might be 1 or 2 would not be correct.... but due to unacademy....i am unable to mark them 99 percent correct......so thanks a lot sir
The Mercalli intensity scale is a seismic scale used for measuring the intensity of an earthquake
thanks Dr.sir please add questions on blood.very general but important we must know all.
  1. Q226. Human beings can hear the sounds having a frequency of; a. 20- 2000 hertz b. 20- 20000 hertz c. 200- 2000 hertz d. 2- 20000 hertz


  2. Answer:b Explanation: self-explanatory


  3. 0227. Ultrasonography, a common medical diagnostic procedure produces sound with a frequency of; a. Greater than 20000 hertz. b.Greater than 2000 hertz C. d. Less than 20 hertz


  4. Answer: a Explanation: Ultra sound here means more than the upper limit of human ear.


  5. Q228. Which type of motion produces sound? a. Linear motion b. Non-uniform motion c. Vibration d Circular motion


  6. Answer: c Explanation: self-explanatory


  7. Q229. Consider the following statements? 1. Loudness of a sound depends on the amplitude of the 2. Pitch of a sound depends on the frequency of the vibrating Choose the correct statement/ statements. vibrating source. source a. 1only 2 only c. Both 1 and 2 d. None of the above


  8. Answer: c Explanation: self-explanatory


  9. Q230. What do you understand by electroplating? a. The process of depositing a layer of any desired metal on b. The process of depositing a layer of any desired non-metal c. The process of depositing a layer of positive charge on any d. The process of depositing a layer of negative charge on any another material by means of electricity on another material by means of electricity. material by means of electricity material by means of electricity.


  10. Answer: a Explanation: self-explanatory Electroplating is a very useful process. It is widely used in industry for coating metal objects with a thin layer of a different metal. The layer of metal deposited has some desired property, which the metal of the object lacks. For example, chromium plating is done on many objects such as car parts, bath taps, kitchen gas burners, bicycle handlebars, wheel rims and many others. Chromium has a shiny appearance. It does not corrode. lt resists scratches. However, chromium is expensive and it may not be economical to make the whole object out of chromium. So the object is made from a cheaper metal and only a coating of chromium over it is deposited


  11. 0231. Which of the following is the safest place to take shelter during lightning? a. A large tree b. Inside a vehicle with windows closed C. Under an umbrella d. In a garage


  12. Answer:b Explanation: If lightning strikes a vehicle it is transmitted through its body to the ground and the inside of the vehicle is a safe zone


  13. Answer:d Explanation: Self-explanatory


  14. Q234. Earthquakes are caused by movements of plates present in the; a. Crust b. Mantle C. d. Mountains


  15. Answer:b Explanation: Since earthquakes are caused by the movement of plates, the boundaries of the plates are the weak zones where earthquakes are more likely to occur. The weak zones are also known as seismic or fault zones.


  16. Q236. Which of the following regions of India is least susceptible to earthquakes? a. Himalayas b.North-eastern India c. Rann of Kucchh d. Deccan plateau


  17. Answer:d Explanation: Deccan plateau is a tectonically stable zone.


  18. Q238. When a meteor enters the atmosphere it burns out due to; a. High speed and friction. b. Combustible gases in it. C. Burning of hydrogen in the atmosphere on contact with the hot meteor surface. C. d. Magnetic field of the earth.


  19. Q239. What do you understand by marble cancer? a. Corrosion of building and statues made up of marbles by action of sulphuric acid and nitric acid. b. Cancer caused by persistent contact with marble. c. Chronic respiratory disease caused due to exposure to marble dust. d. Faults in the marble caused by dust and sunlight.


  20. Q240. Which of the following is not a green-house gas? Methane b. Carbon dioxide C. Nitrous oxide d. Nitrogen


  21. Answer:d Explanation: primary greenhouse gases in Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone.