IIT JEE Practice Question and Answer

Q: 70000 a year is how much an hour? 1829 0

  • 1
    80
    Correct
    Wrong
  • 2
    8
    Correct
    Wrong
  • 3
    0.8
    Correct
    Wrong
  • 4
    0.08
    Correct
    Wrong
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Answer : 2. "8"
Explanation :

Answer: B) 8 Explanation: Given for year = 70000 => 365 days = 70000 => 365 x 24 hours = 70000 =>   1 hour = ? 70000/365x24 = 7.990 = 8

Q: Opening in a wall to let in air or light 1829 0

  • 1
    Ceiling
    Correct
    Wrong
  • 2
    Door
    Correct
    Wrong
  • 3
    Window
    Correct
    Wrong
  • 4
    All the above
    Correct
    Wrong
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Answer : 3. "Window"
Explanation :

Answer: C) Window Explanation: The Opening in a wall to let in air or light is nothing but a Window.

Q: A class has 8 football players. A 5-member team and a captain will be selected out of these 8 players. How many different selections can be made ? 1828 0

  • 1
    210
    Correct
    Wrong
  • 2
    168
    Correct
    Wrong
  • 3
    1260
    Correct
    Wrong
  • 4
    10!/6!
    Correct
    Wrong
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Answer : 2. "168"
Explanation :

Answer: B) 168 Explanation: we can select the 5 member team out of the 8 in 8C5 ways = 56 ways. The captain can be selected from amongst the remaining 3 players in 3 ways. Therefore, total ways the selection of 5 players and a captain can be made = 56x3 = 168 ways.   (or)   Alternatively, A team of 6 members has to be selected from the 8 players. This can be done in 8C6 or 28 ways. Now, the captain can be selected from these 6 players in 6 ways. Therefore, total ways the selection can be made is 28x6 = 168 ways.

Q: Who is the richest person in the world 2018? 1827 0

  • 1
    Jeff Bezos
    Correct
    Wrong
  • 2
    Bill Gates
    Correct
    Wrong
  • 3
    Warren Buffets
    Correct
    Wrong
  • 4
    Mark Zuckerberg
    Correct
    Wrong
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Answer : 1. "Jeff Bezos"
Explanation :

Answer: A) Jeff Bezos Explanation: Jeff Bezos is the richest person in modern history. The Amazon.com Inc. founder’s net worth broke $150 billion in New York on 16th July 2018 morning, according to the Bloomberg Billionaires Index.       That’s about $55 billion more than Microsoft Corp. co-founder Bill Gates, the world’s second-richest person.

Q: How many Species go Extinct Every Day? 1827 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.'

Q: Cancer is caused by 1826 0

  • 1
    Loss of immunity of cells
    Correct
    Wrong
  • 2
    Uncontrolled meiosis
    Correct
    Wrong
  • 3
    Uncontrolled mitosis
    Correct
    Wrong
  • 4
    Rupturing of cells
    Correct
    Wrong
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Answer : 3. "Uncontrolled mitosis"
Explanation :

Answer: C) Uncontrolled mitosis Explanation:

Q: Which of the following is a characteristic of all minerals? 1826 0

  • 1
    Crystalline solids
    Correct
    Wrong
  • 2
    Minerals are inorganic
    Correct
    Wrong
  • 3
    All minerals are formed in a natural process
    Correct
    Wrong
  • 4
    All the above
    Correct
    Wrong
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Answer : 4. "All the above"
Explanation :

Answer: D) All the above Explanation: Common properties of Minerals are :   1. All minerals are formed in a natural process. 2. Minerals are inorganic 3. Minerals are crystalline solids. 4. Every mineral is an element or compound with a definite chemical composition.

Q: A government subsidy to the producers of a product 1826 0

  • 1
    reduces product demand
    Correct
    Wrong
  • 2
    increases product supply
    Correct
    Wrong
  • 3
    reduces product supply
    Correct
    Wrong
  • 4
    increases product demand
    Correct
    Wrong
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Answer : 2. "increases product supply"
Explanation :

Answer: B) increases product supply Explanation:

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