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421-450: 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
Hello ma'am I have qualified my net exam in DEC 2018 in labour walfare I did my MBA in hr & marketing please provide further guidance after qualifying net & to become labour walfare officer please prepare vedios on scope after qualifying net exam
Veena Sinha
a year ago
Congratulation
SSC CGL & CHSL Descriptive Book by Paramount Coaching Centre https://sscpreparationwithsubhendu.wordpress.com
M
thanks you sir. Sir it would have been fruitful for layman if u provide separate ncert mcq for biology physics chemistry upto class 10th
jabardast course sir! thank u so much ..:)
sir from 9th to 12th also please
from 9th to 12th bhi chahiye sir.. plz banado.. isse Accha study Ho Raha hai
Viki Banait
a year ago
yes........... same here .....
  1. Introduction: In this video, we shall discuss the important questions related to circulatory system of human body These questions are based on class VIIth NCERT In previous videos, some learners have suggested that these questions are of a bit higher standard. Those persons are partially right but they need to focus on two things 1. Perspective: The perspective of a graduate reading the book or a kid reading the same book should be different. A graduate is supposed to have a more broader view of the same topic. "Winners don't do different things, they do the things differently". 2. Relevancy and objective : The objective is not to teach the school syllabus here, the objective is to revise your already learned concepts with keeping in mind their relevancy in the respective competitions 3. These questions fulfill both the purpose. We are committed to provide the full value to your time spent here, and we leave no stone unturned in ensuring that you need not to browse any other source to understand the concept you learned here 4. So, enjoy learning folks. All The best!


  2. Q421. Consider the following statements about Blood: 1. Blood is a liquid that transports oxygen and nutrients to our tissues. 2. Blood is made up of plasma, red blood cells, white blood cells and platelets. 3. The combination of plasma and White blood cells is called platelets. 4. Insects do not have blood. Select the correct answer using the code given below: A. 1 and 2 only B. 1 and 3 only C. 2, 3 and 4 only D. All of the above 2 Blood is made up of plasma, red blood cell, white blood cells and platelets


  3. Solution: A Platelets are different cells. Insects do not have blood as we know it from the higher animals. They have a kind of, which is called hemolymph and is, compared to humans, a mixture of blood and the lymphatic fluid. The most important difference is that hemolymph doesn't transport oxygen and thus has no red blood cells.


  4. Q422. Consider the following statements about red blood cells: 1. RBC carries oxygen, carbon dioxide and other gases in our body. 2. RBCs are produced in bone marrow. 3. Helps in maintaining the normal pH balance of blood. 4. RBC contains hemoglobin which is an oxygen carrying protein. Select the correct answer using the code given below: A. 1, 2 and 3 only B. 1 and 2 only C. 2 and 3 only D. All of the above


  5. Solution: D Self explanatory


  6. Q423. The normal pH value of human blood is? A. 6.3-6.5 B. 6.5-7.3 C. 7.3-7.45 D. 7.5-8.0


  7. Solution: C Self explanatory


  8. Q424. Consider the following statements about white blood cells: 1. WBCs are found in the blood vessels only. 2. They are major parts of immune system and kills pathogen. 3. Some WBCs also make antibodies. 4. WBCs are produced in spleen and bone marrow. Select the correct answer using the code given below: A. 1, 2 and 3 only B. 1, 2 and 4 only C. 2, 3 and 4 only D. All of the above 4. waCs are produced in spleen and bone marrow


  9. Solution: C WBCs are found outside the blood also i.e. In lymph node.


  10. 0425. Consider the following state 1. Blood vessels are of three types 2. Veins are blood vessels which carries the blood away from the heart. 3. Arteries are the blood vessels which carries the blood toward the heart. 4. Capillaries are the smallest of a body's blood vessels. Select the correct answer using the code given below: A. 1, 2 and 3 only B. 1 and 3 only C. 1 and 4 only D. 2, 3 and 4 only


  11. Solution: C Arteries are the blood vessels which carries the blood away from the heart. Veins are blood vessels which carries the blood towards the heart.


  12. 0426. Consider the following: 1. Arteries carries the oxygenated blood and have thick elastic walls. 2. Veins carries carbon dioxide rich blood and have thin elastic walls. 3. Blood pressure in arteries is low as compared to the Veins Select the correct answer using the code given below A. B. C. D. All of the above 1 and 2 only 1 and 3 only 2 and 3 only


  13. Q427. Consider the following statements 1. Platelets helps in forming blood clots to stop bleeding. 2. In dengue, the platelets count may reduce very fast. 3. Platelets are found in mammals and birds. Select the correct answer using the code given below A. B. C. D. All of the above 1 and 2 only 1 and 3 only 2 and 3 only


  14. Solution: B Blood moves in this way : heart->artery->arteriole->capillary->venue-)vein heart. This is called circulation


  15. Q430. The fluid part of the blood is known as? A. Platelets B. Red blood cells C. Plasma D. B and C


  16. Solution: C Self explanatory


  17. Q431. Which of the following blood vessels contains the valve to prevent the back flow of the blood? A. Arteries B. Veins C. Arterioles D. Capillary


  18. Solution: A spleen is the site where red blood cells are destroyed.


  19. Solution: D Self explanatory


  20. Solution: A The red blood cells have average life of 120 days and then destroyed in the spleen. That's why spleen is known as graveyard of red blood cells


  21. Solution: D Lymphocytes are a type of WBCs. WBCs are produced in Bone marrow. Bone marrow is found in long bones.


  22. Q436. Which of the following blood vessels delivers the nutrients rich blood from the stomach and small intestine to liver? A. Hepatic portal vein B. Hepatic Vein C. Right hepatic artery D. Left Hepatic artery


  23. Solution: B Again you need to be cautious. Remember, the blood flows from heart to other part of the body in arteries. So you can easily Again hepatic is something related to liver and since you are already aware about the working This establish C as the only right option. eliminate the option C and D of hepatic portal vein. So you can eliminate the option A also.


  24. Q440. Consider the following statement about Antigens: 1. Triggers the immune system 2. Lowers the body temperature. 3. Destroys the harmful bacteria. 4. Antigens are polysaccharides commonly found in RBC. 5. Antigens defines the blood group. Select the correct answer using the code given below: A. 1, 2 and 3 only B. 1, 2 and 5 only C. 1, 4 and 5 only D. 2, 3 and 4 only


  25. Solution: C Antibodies destroys the harmful bacteria. Antigens are the indicator of harmful bacteria They do not lower the body temperature. All other statements are self explanatory. Statement 1 is very important to remember


  26. Q441. Consider the following statements about antibodies: 1. Antibodies are found in the white blood cells. 2. Antibodies protect against the bacterial and viral attack. 3. The person having no antibodies belongs to O blood group. Select the correct answer using the code given below A. B. C. D. 1, 2 and 3 only 1 and 2 only 1 and 3 only 2 and 3 only


  27. Q446. Consider the following statements: 1. Pernicious anemia is due to Vitamin B12. 2. Aplastic anemia is inability of bone marrow to produce blood cells. Select the correct answer using the code given below: A. 1 only B. 2 only C. Both 1 and 2 D. None


  28. Solution: B Self explanatory


  29. Q450. Consider the following about Bombay Blood group: 1. It is a rare blood group. 2. It is also known as HH blood group. 3. People who have Bombay phenotype can donate blood to any member of the AB0 blood group 4. They can receive the blood of HH blood group only. Select the correct answer using the code given below: A. 1, 2 and 3 only B. 1, 2 and 4 only C. 1 and 4 only D. All of the above


  30. Solution: D Self explanatory Third statement is most important.