IIT JEE Practice Question and Answer

Q: A sum of Rs. 427 is to be divided among A, B and C in such a way that 3 times A’s share, 4 times B’s share and 7 times C’s share are all equal. The share of C is ? 5635 0

  • 1
    64
    Correct
    Wrong
  • 2
    76
    Correct
    Wrong
  • 3
    84
    Correct
    Wrong
  • 4
    98
    Correct
    Wrong
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Answer : 3. "84"
Explanation :

Answer: C) 84 Explanation: Given total sum = Rs. 427And given that 3 times A’s share, 4 times B’s share and 7 times C’s share are all equal.=> 3A = 4B = 7CBut given=> A + B + C = 427Now express A and B in terms of C i.e=> (7C/3) + (7C/4) + C = 427=> C = 84

Q: The Study of Ancient Societies is called 5614 0

  • 1
    Anthropology
    Correct
    Wrong
  • 2
    Archaeology
    Correct
    Wrong
  • 3
    History
    Correct
    Wrong
  • 4
    Ethnology
    Correct
    Wrong
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Answer : 2. "Archaeology"
Explanation :

Answer: B) Archaeology Explanation: Archaeology is the science which studies ancient societies based on their material remains. Through the analysis of objects and those works constructed by ancient peoples, this science can arrive at conclusions about their culture and their ways of life. There are several branches of Archaeology as well as many tools relevant to this science.

Q: Find the odd number out of the following number series? 2 4 8 11.5 18.25 28.375 5603 0

  • 1
    18.25
    Correct
    Wrong
  • 2
    28.375
    Correct
    Wrong
  • 3
    11.5
    Correct
    Wrong
  • 4
    8
    Correct
    Wrong
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Answer : 4. "8"
Explanation :

Answer: D) 8 Explanation: Given number series follows a pattern that, 2 2 x 1.5 + 1 = 4 4 x 1.5 + 1 = 7 (not equal to 8) 7 x 1.5 + 1 = 11.5 11.5 x 1.5 + 1 = 18.25 18.25 x 1.5 + 1 = 28.375   Hence, the odd number in the given number series is 8.

Q: Which is the gas used for making vegetables and vanaspathi from vegetable oils? 5579 0

  • 1
    Hydrogen
    Correct
    Wrong
  • 2
    Nitrogen
    Correct
    Wrong
  • 3
    Argon
    Correct
    Wrong
  • 4
    Helium
    Correct
    Wrong
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Answer : 1. "Hydrogen"
Explanation :

Answer: A) Hydrogen Explanation: Hydrogen gas is used for making vegetables and vanaspathi from vegetable oils. As it is colourless, odourless, tasteless, flammable gaseous substance, it is added to oils to make them more solid or spreadable. The use of hydrogenation helps to prolong the shelf life of the food and maintain flavour stability.

Q: Lichens are the best indicator of 5540 1

  • 1
    Air pollution
    Correct
    Wrong
  • 2
    Sound pollution
    Correct
    Wrong
  • 3
    Noise pollution
    Correct
    Wrong
  • 4
    Water pollution
    Correct
    Wrong
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Answer : 1. "Air pollution"
Explanation :

Answer: A) Air pollution Explanation: 1. Lichens are plants that grow in exposed places such as rocks or tree bark.   2.  Lichens are widely used as environmental indicators or bio-indicators. They can be used as air pollution indicators, especially of the concentration of sulfur-di-oxide in the atmosphere.     3. They need to be very good at absorbing water and nutrients to grow there.

Q: Which of these relationships is true of an uncharged atom? 5537 0

  • 1
    The atomic mass is equal to the atomic number.
    Correct
    Wrong
  • 2
    The number of electrons is equal to the number of neutrons.
    Correct
    Wrong
  • 3
    The number of protons is equal to the number of electrons.
    Correct
    Wrong
  • 4
    The atomic mass is equal to the number of electrons.
    Correct
    Wrong
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Answer : 3. "The number of protons is equal to the number of electrons."
Explanation :

Answer: C) The number of protons is equal to the number of electrons. Explanation: The number of protons is equal to the number of electrons. That is the number of positive charges is equal to the number of negative charges.

Q: 'P' walked 1 km towards south direction and turned  90oACW and walked 2 km. Then he turned his left and walked 1 km and then he turned his right and walked 2 km. After that he turned 90o ACW and walked 3 km. How far is he from the starting point ? 5529 0

  • 1
    5 km
    Correct
    Wrong
  • 2
    4 km
    Correct
    Wrong
  • 3
    2 km
    Correct
    Wrong
  • 4
    0 km
    Correct
    Wrong
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Answer : 1. "5 km"
Explanation :

Answer: A) 5 km Explanation:

Q: Two trains are moving in the same direction at 72 kmph and 36 kmph. The faster train crosses a girl sitting at window seat in the slower train in 32 seconds. Find the length of the faster train ? 5519 0

  • 1
    170 m
    Correct
    Wrong
  • 2
    100 m
    Correct
    Wrong
  • 3
    270 m
    Correct
    Wrong
  • 4
    320 m
    Correct
    Wrong
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Answer : 4. "320 m"
Explanation :

Answer: D) 320 m Explanation: Relative speed = (72 - 36) x 5/18 = 2 x 5 = 10 mps.Distance covered in 32 sec = 32 x 10 = 320 m. The length of the faster train = 320 m.

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