IIT JEE Practice Question and Answer

Q: How many three digit numbers 'abc' are formed where two of the three digits are same ? 1719 0

  • 1
    252
    Correct
    Wrong
  • 2
    648
    Correct
    Wrong
  • 3
    243
    Correct
    Wrong
  • 4
    900
    Correct
    Wrong
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Answer : 3. "243"
Explanation :

Answer: C) 243 Explanation: Digits are 0,1,2,3,4,5,6,7,8,9. So no. of digits are 10   First all possible case => 9(0 excluded) x 10 x 10 = 900   Second no repetition allowed =>9 x 9 x 8 = 648   Third all digits are same => 9 (111,222,333,444,555,666,777,888,999)   Three digit numbers where two of the three digits are same = 900 - 648 - 9 = 243 ;

Q: ______ is the first state to have Logo for Vehicles Driven by person with Hearing Impairment ? 1718 0

  • 1
    Telangana
    Correct
    Wrong
  • 2
    Rajasthan
    Correct
    Wrong
  • 3
    Gujarat
    Correct
    Wrong
  • 4
    Haryana
    Correct
    Wrong
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Answer : 1. "Telangana"
Explanation :

Answer: A) Telangana Explanation: Telangana has introduced a logo for identifying vehicles driven by persons with hearing impairment and has become the first state in the country to do so. The logo was designed by city-based graphic designer Manikanta Annapragada who was the first person to obtain a driving licence under the ‘hearing impaired’ category in the country. The logo consists of a hearing impaired mark along with text saying, “Driver is deaf — Please watch out”.

Q: Which method of expressing direction is indicated in the illustration? 1718 0

  • 1
    Section
    Correct
    Wrong
  • 2
    Interjuction
    Correct
    Wrong
  • 3
    Intersection
    Correct
    Wrong
  • 4
    None of the above
    Correct
    Wrong
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Answer : 3. "Intersection"
Explanation :

Answer: C) Intersection Explanation:

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Answer : 4. "100 min"
Explanation :

Answer: D) 100 min Explanation: Work done by the third pipe in 1 min = 1/50 - (1/60 + 1/75) = - 1/100.[-ve sign means emptying] The third pipe alone can empty the cistern in 100 min.

Q: In a joint family, there are 24 members whose age is decreased by 4 months, when one girl aged 24 years is replaced by a new boy. Find the age of the new boy ? 1716 0

  • 1
    18 years
    Correct
    Wrong
  • 2
    12 years
    Correct
    Wrong
  • 3
    15 years
    Correct
    Wrong
  • 4
    16 years
    Correct
    Wrong
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Answer : 4. "16 years"
Explanation :

Answer: D) 16 years Explanation: Age of new boy = (Age of moved girl) – (Number of family members × Decreased in average) = 24 – 24×4/12 = 24 – 8 = 16 years.

Q: Select a figure from the four alternatives that would complete the Figure Matrix.                (1)   (2)   (3)   (4) 1716 0

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

Answer: A) 4 Explanation: Similar small figures are increasing by one in each of the bigger figure.

Q: The reserves of a commercial bank consist of 1716 0

  • 1
    the bank's net worth
    Correct
    Wrong
  • 2
    the amount of money market funds it holds
    Correct
    Wrong
  • 3
    government securities that the bank holds
    Correct
    Wrong
  • 4
    deposits at the Federal Reserve Bank and vault cash
    Correct
    Wrong
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Answer : 4. "deposits at the Federal Reserve Bank and vault cash"
Explanation :

Answer: D) deposits at the Federal Reserve Bank and vault cash Explanation:

Q: Which of the following elements is a metal? 1716 0

  • 1
    Se
    Correct
    Wrong
  • 2
    I
    Correct
    Wrong
  • 3
    Zn
    Correct
    Wrong
  • 4
    S
    Correct
    Wrong
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Answer : 3. "Zn"
Explanation :

Answer: C) Zn Explanation: In chemistry, a metal is an element that readily forms positive ions (cations) and has metallic bonds. Metals are opaque, lustrous elements that are good conductors of heat and electricity. Most metals are malleable and ductile and are, in general, denser than the other elemental substances.   Examples of metals are aluminium, copper, iron, tin, gold, lead, silver, titanium, uranium, and zinc.   Here Se - Selenium is an element but is not a metal, S - Sulphur is not a metal and I - Iodine is also not a metal.   Hence, Zn - Zinc is the only metal in the given options.

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