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121-135: 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
acha method lag raha hai mam
very nice sir....,, dffaaaa hoooo,,,..
Small correction Sir. Question 134 - key says adaptation for hot habitat is thin skin- But Page 75 VII Science NCERT days Thick skin for Tropical animals!
SS
To avoid excess evaporation and dehydration thick skin is desired..
Navneet Gupta
2 years ago
yes..you are right. Its thick skin, not thin skin.
BS
I found the lessons taught by you and Jatin sirs "the Hindu analysis" the best lessons ever.
thank you so much sir ... too much of this ... bahot mcq ho gaye sir ... 4 to 5k ho gaye total overall ... what to do now
  1. 0121. Which of the following joints allow movement in all directions? a. Pivotal joints b. Ball and socket joints c. Hinge joints d. Round joints


  2. Answer: b Explanation: Self-explanatory


  3. 0122. Which of the following is a ball and socket joint? a. Shoulder joint b. Ankle joint c. Knee joint d. Wrist joint


  4. Answer: a Explanation: Another such joint is Hip joint.


  5. Q123. The joint that allows us to move our neck is a; a. Pivotal joint b. Ball and socket joint c. Hinge joint d. Round joint


  6. Answer: a Explanation: It allows us to bend our head forward and backwards and turn the head to our right or left.


  7. 0124. Which of the following is a hinge joint? a. Shoulder joint b. Hip joint C. d. Elbow joint Joints in the skull


  8. Answer:d Explanation: A hinge joint allows motion in one direction only, like a hinge of a door. Knee joint is another example of hinge joint.


  9. 0125. Which of the following is a fixed joint? a. Shoulder joint b. Hip joint C. d. Elbow joint Joints in the skull


  10. Answer: c Explanation: Fixed joints don't allow the involved bones to move.


  11. Q126. Consider the following statements regarding muscles; When contracted, the muscle becomes shorter, stiffer and thicker and it pulls the bone. 1. 2. Muscles work in pairs. Choose the correct statement/ statements? a. 1 only 2 only Both 1 and 2 None of the above C. d.


  12. Answer: c Explanation: Muscles work in pairs. When one of them contracts, the bone is pulled in that direction. The other muscle of the pair relaxes. To move the bone in the opposite direction, the relaxed muscle contracts to pull the bone towards its original position, while the first relaxes. A muscle can only pull. It cannot push. Thus, two muscles have to work together to move a bone


  13. Answer: c Explanation: Self-explanatory


  14. Q129. The presence of specific features or certain habits, which enable a plant or an animal to live in its surroundings, is called; Accommodation b. C. Habitat d. Body plan


  15. Answer:d Explanation: Self-explanatory


  16. Q131. Which of the following is an example of an aquatic habitat? a. b. Grasslands C. Coastal area C. Oceans d. Tropical forests


  17. Answer: c Explanation: Self-explanatory


  18. 0133. Non-living things such as rocks, soil, air and water in the habitat constitute its a. Biotic components b. Abiotic components c. Lifeless components d. Deciding components


  19. 0134. Which of the following is an adaptation for hot habitats? a. Thin skin b. Thick skin c. Heavy fur d. Deep chest


  20. 0135. Adaptation in an organism occurs in response to change in; 1. Biotic factors 2. Abiotic factors Choose the correct statement/ statements. a. b. c. Both 1 and 2 d. None of the above 1 only 2 only


  21. Answer: c Explanation: Adaptation occurs in response to change in biotic as well as abiotic factors