IIT JEE Practice Question and Answer

Q: Whether the last number 240 in the following series is according to the remaining numbers pattern ? 2, 4, 12, 48, 240 1123 0

  • 1
    TRUE
    Correct
    Wrong
  • 2
    FALSE Answer & Explanation Answer:
    Correct
    Wrong
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Answer : 1. "TRUE"
Explanation :

Answer: A) TRUE Explanation: The given series follows, 2 2 x 2 = 4 4 x 3 = 12 12 x 4 = 48 48 x 5 = 240.

Q: Milk and water are mixed in a vessel A as 4:1 and in vessel B as 3:2. For vessel C, if one takes equal quantities from A and B, find the ratio of milk to water in C. 1122 0

  • 1
    1:9
    Correct
    Wrong
  • 2
    9:1
    Correct
    Wrong
  • 3
    3:7
    Correct
    Wrong
  • 4
    7:3
    Correct
    Wrong
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Answer : 4. "7:3"
Explanation :

Answer: D) 7:3 Explanation: Ratio of Milk and water in a vessel A is 4 : 1   Ratio of Milk and water in a vessel B is 3 : 2   Ratio of only milk in vessel A = 4 : 5   Ratio of only milk in vessel B = 3 : 5   Let 'x' be the quantity of milk in vessel C   Now as equal quantities are taken out from both vessels A & B   => 4/5     :     3/5               x   3/5-x          x - 4/5   => 35-xx-45 = 11 (equal quantities)   => x = 7/10   Therefore, quantity of milk in vessel C  = 7   => Water quantity = 10 - 7 = 3   Hence the ratio of milk & water in vessel 3 is 7 : 3

Q: Order of basicity of amines in gaseous state? 1122 0

  • 1
    2'> 1'> 3' > NH3
    Correct
    Wrong
  • 2
    3' > 2' > 1'> NH3
    Correct
    Wrong
  • 3
    1' > 2' > 3'> NH3
    Correct
    Wrong
  • 4
    2'> 3'> 1' > NH3
    Correct
    Wrong
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Answer : 2. "3' > 2' > 1'> NH3"
Explanation :

Answer: B) 3' > 2' > 1'> NH3 Explanation: The order of basicity in ammonia is different in gaseous phases vs. aqueous phases due to hydrogen bonding.   So in gaseous phases it's the well known: 3' > 2' > 1'> NH3. Just so we're on the same page, this is due to the inductive effect of electron donating alkyl groups--they destabilize the lone pair on nitrogen atom, making nitrogen more basic.   But in aqueous phase, the order is slightly different: 2'> 1'> 3' > NH3.

Q: Consent of the People means 1122 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: What process never occurs in interphase? 1122 0

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Answer :
Explanation :

Absence of cell division is the process that never comes in interphase.

Q: According to Forbes, Who has become Asia’s richest person in the year 2017? 1122 0

  • 1
    Jeff Bezos
    Correct
    Wrong
  • 2
    Hui Ka Yan
    Correct
    Wrong
  • 3
    Mukesh Ambani
    Correct
    Wrong
  • 4
    Bill Gates
    Correct
    Wrong
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Answer : 3. "Mukesh Ambani"
Explanation :

Answer: C) Mukesh Ambani Explanation: Reliance Industries Chairman Mukesh Ambani overtook China’s Hui Ka Yan to become Asia’s richest person with a total wealth of $42.1 billion. According to Forbes’ real time billionaire’s list, Ambani's personal wealth rose by $466 million in 2017.

Q: 3/4 divided by 2 is 1121 0

  • 1
    3/2
    Correct
    Wrong
  • 2
    2/3
    Correct
    Wrong
  • 3
    8/3
    Correct
    Wrong
  • 4
    3/8
    Correct
    Wrong
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Answer : 4. "3/8"
Explanation :

Answer: D) 3/8 Explanation: 3/4 divided by 2 = 3/4/2 = 3/4x2 = 3/8.   Hence, 3/4 divided by 2 is equal to 3/8.

Q: What is the least number of squares tiles required to pave the floor of a room 15 m 17 cm long and 9 m 2 cm broad ? 1121 0

  • 1
    844
    Correct
    Wrong
  • 2
    814
    Correct
    Wrong
  • 3
    840
    Correct
    Wrong
  • 4
    820
    Correct
    Wrong
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Answer : 2. "814"
Explanation :

Answer: B) 814 Explanation: Length of largest tile = H.C.F. of 1517 cm and 902 cm = 41 cm.Area of each tile = (41 x 41) sq.cm Required number of tiles =1517 x 902/(41 x 41) = 814.

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