IIT JEE Practice Question and Answer

Q: Consent of the People means 1308 0

  • 1
    All the People
    Correct
    Wrong
  • 2
    Majority of People
    Correct
    Wrong
  • 3
    Leader of the People
    Correct
    Wrong
  • 4
    A few People
    Correct
    Wrong
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Answer : 2. "Majority of People"
Explanation :

Answer: B) Majority of People Explanation: Consent of the People means the Majority of People, as expressed by votes in elections. Consent of the governed refers to the idea that a government's legitimacy and moral right to use state power is only justified and lawful when consented to by the people or society over which that political power is exercised.

Q: The wavelength of a wave is the distance between 1280 0

  • 1
    Crest and Trough
    Correct
    Wrong
  • 2
    Crest and Crest
    Correct
    Wrong
  • 3
    Trough and Trough
    Correct
    Wrong
  • 4
    Both B & C
    Correct
    Wrong
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Answer : 4. "Both B & C"
Explanation :

Answer: D) Both B & C Explanation: Distance between two Consecutive Crests or two Consecutive Troughs is called Wavelength. But the distance between crest and adjacent trough is half the wavelength. That is the distance between adjacent crest and trough is called Half the wavelength.

Q: Who Discovered The Nucleus of a Cell? 1246 0

  • 1
    Otto Hahn
    Correct
    Wrong
  • 2
    John Dalton
    Correct
    Wrong
  • 3
    Robert Brown
    Correct
    Wrong
  • 4
    Marie Curie
    Correct
    Wrong
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Answer : 3. "Robert Brown"
Explanation :

Answer: C) Robert Brown Explanation: Robert Brown, Scottish botanist, Discovered The Nucleus of a Cell in 1831, London. When Brown was studying orchids under microscope when he observed an opaque area, which he called the "Areola" or "Nucleus", in the cells of the flower's outer layer. The nucleus was also described by Franz Bauer in 1804 but in detail Robert Brown made it in 1831.

Q: Which of these is Not a Carcinogen? 1584 0

  • 1
    Cadmium
    Correct
    Wrong
  • 2
    Asbestos
    Correct
    Wrong
  • 3
    Benzene
    Correct
    Wrong
  • 4
    All the above
    Correct
    Wrong
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Answer : 4. "All the above"
Explanation :

Answer: D) All the above Explanation: Asbestos can cause  Lungs Gastrointestinal tract  types of Cancer. Benzene can cause Leukemia Hodgkin's lymphoma types of Cancer. Cadmium can cause Prostate type of Cancer.

Q: If sum of upstream and downstream speed of a boat is 82 kmph, and the boat travels 105 km. upstream in 3 hr, Find the time taken by boat to cover 126 km downstream. 2002 0

  • 1
    2.8 hrs
    Correct
    Wrong
  • 2
    2.7 hrs
    Correct
    Wrong
  • 3
    2.6 hrs
    Correct
    Wrong
  • 4
    2.5 hrs
    Correct
    Wrong
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Answer : 2. "2.7 hrs"
Explanation :

Answer: B) 2.7 hrs Explanation: Let Speed of boat in still water = b Let Speed of still water = w Then we know that, Speed of Upstream = U = boat - water Speed of Downstream = D = boat + water Given, U + D = 82 b - w + b + w = 82 2b = 82 => b = 41 kmph From the given data, 41 - w = 105/3 = 35 w = 6 kmph Now, b + w = 126/t => 41 + 6 = 126/t => t = 126/47  = 2.68 hrs.

Q: The difference between simple interest and compound interest of a certain sum of money at 20% per annum for 2 years is Rs. 56. Then the sum is : 1669 0

  • 1
    Rs. 3680
    Correct
    Wrong
  • 2
    Rs. 2650
    Correct
    Wrong
  • 3
    Rs. 1400
    Correct
    Wrong
  • 4
    Rs. 1170
    Correct
    Wrong
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Answer : 3. "Rs. 1400"
Explanation :

Answer: C) Rs. 1400 Explanation: We know thatThe Difference between Compound Interest and Simple Interest for n years at R rate of interest is given by C.In - S.In = PR100n Here n = 2 years, R = 20%, C.I - S.I = 56 56 = P201002=> P = 56 x 52=> P = 56 x 25=> P = Rs. 1400

Q: What are the Monomers that make up Proteins? 1284 0

  • 1
    Amino acids
    Correct
    Wrong
  • 2
    Nucleotides
    Correct
    Wrong
  • 3
    Disaccharides
    Correct
    Wrong
  • 4
    Chaperones
    Correct
    Wrong
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Answer : 1. "Amino acids"
Explanation :

Answer: A) Amino acids Explanation: Proteins are long chains of Amino acids. That is in brief, Amino acids are the monomers of Proteins. Amino acids are compounds which contain both an amino group and a carboxylic group. Proteins are made up of 20 essential amino acids. Monomer means a small molecule of an organic substance i.e, building block in general.

Q: How many Species go Extinct Every Day? 1828 0

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Answer :
Explanation :

About 150 - 200 species of plant, insect, bird and mammal become extinct every day or 24 hrs. This is not an accurate but an estimation by U.N. Convention on Biological Diversity and Global Extinction Rates. It is also said that current extinctions were 'up to 100 times higher than the background rate.'

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