IIT JEE Practice Question and Answer

Q: Which is faster Light or Sound? 1573 1

  • 1
    Light
    Correct
    Wrong
  • 2
    Sound
    Correct
    Wrong
  • 3
    Both are same
    Correct
    Wrong
  • 4
    Can't be determined
    Correct
    Wrong
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Answer : 1. "Light"
Explanation :

Answer: A) Light Explanation: Light travels Faster than Sound.   Light : 1. Light doesn't require a medium to travel. 2. It travels in the vaccum with the speed of 1,86,000 miles per second.   Sound: 1. Sound rquire a medium. 2. It travels in the Air with the speed of 340 meters per second. 3. It travels Faster in Water than in Air. 4. It travels Faster in Steel than in Water.

Q: Who Built The Suez Canal? 1572 0

  • 1
    Theodore Roosevelt
    Correct
    Wrong
  • 2
    Ferdinand de Lesseps
    Correct
    Wrong
  • 3
    Robert Mills
    Correct
    Wrong
  • 4
    James Hoban
    Correct
    Wrong
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Answer : 2. "Ferdinand de Lesseps"
Explanation :

Answer: B) Ferdinand de Lesseps Explanation: The Suez Canal in Egypt, is a 101 mile long canal that connects the Mediterranean Sea with the Gulf of Suez, a northern branch of the Red Sea. It was built in 1869 by Ferdinand de Lesseps.

Q: K men agree to donate a gift of Rs. L to trust. If three men drop out how much more will each have to contribute towards the purchase of the gift ? 1571 0

  • 1
    L / (k-3)
    Correct
    Wrong
  • 2
    k / (L-3)
    Correct
    Wrong
  • 3
    2K / 3L-K
    Correct
    Wrong
  • 4
    3L / K(K-3)
    Correct
    Wrong
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Answer : 4. "3L / K(K-3)"
Explanation :

Answer: D) 3L / K(K-3) Explanation: Intial contribution = L/KAfter 3 men drop, then contribution =L/K-3The amount more to pay in contribution = LK-3 - LK   = 3LK(K-3)

Q: Nucleotides are attached by bonds between the 1571 0

  • 1
    phosphates and sugars
    Correct
    Wrong
  • 2
    nitrates and sugars
    Correct
    Wrong
  • 3
    nitrates and phosphates
    Correct
    Wrong
  • 4
    sugars and hydrates
    Correct
    Wrong
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Answer : 1. "phosphates and sugars"
Explanation :

Answer: A) phosphates and sugars Explanation: In DNA, adjacent nucleotides are linked by a phosphodiester bond: a covalent bond is formed between the 5' phosphate group of one nucleotide and the 3'-OH group of another.   Hence, in this manner, each strand of DNA has a "backbone" of phosphate-sugar-phosphate-sugar-phosphate.

Q: If the price of a commodity is decreased by 20% and its consumption is increased by 10%, what will be the increase or decrease in the expenditure on the commodity? 1570 0

  • 1
    increase 12%
    Correct
    Wrong
  • 2
    decrease 12%
    Correct
    Wrong
  • 3
    increase 16%
    Correct
    Wrong
  • 4
    decrease 16%
    Correct
    Wrong
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Answer : 2. "decrease 12%"
Explanation :

Answer: B) decrease 12% Explanation: Given the price of a commodity is decreased by  p = 20% And its consumption is increased by q = 10% Now, required increase or decrease in the expenditure on the commodity can be  p + q + pq/100 = -20 + 10 - 200/100 = -10 - 2 = -12%.   Hence, decrease in the expenditure = 12%

Q: Hemavathi gets 3 marks for each right sum and loses 2 marks for each wrong sum. He attempts 35 sums and obtains 60 marks. The number of sums attempted correctly is ? 1570 0

  • 1
    23
    Correct
    Wrong
  • 2
    24
    Correct
    Wrong
  • 3
    25
    Correct
    Wrong
  • 4
    26
    Correct
    Wrong
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Answer : 4. "26"
Explanation :

Answer: D) 26 Explanation: Let, Hema attempted 'k' sum correctly, then k x 3 -2 x(35-k) = 605k = 130k = 26 so 26 correct sums.

Q: What are the followers of buddhism called? 1570 0

  • 1
    Buddhists
    Correct
    Wrong
  • 2
    Parsis
    Correct
    Wrong
  • 3
    Noble Truths
    Correct
    Wrong
  • 4
    Bhikkhus
    Correct
    Wrong
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Answer : 1. "Buddhists"
Explanation :

Answer: A) Buddhists Explanation: Buddhism is the world's fourth-largest religion, with over 520 million followers or over 7% of the global population. People who practice Buddhism are called Buddhists.   Buddhists seek to reach a state of nirvana, following the path of the Buddha, Siddhartha Gautama, who went on a quest for Enlightenment around the sixth century BC. There is no belief in a personal god.

Q: 112 × 54 = 1570 0

  • 1
    68947
    Correct
    Wrong
  • 2
    69874
    Correct
    Wrong
  • 3
    70000
    Correct
    Wrong
  • 4
    76000
    Correct
    Wrong
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Answer : 3. "70000"
Explanation :

Answer: C) 70000 Explanation: 112 × 54112 × 1024= 112 × 1000024= 1120000/16 = 70,000.

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