IIT JEE Practice Question and Answer

Q: How many seconds will a 800 meter long train moving with a speed of 63 km/hr take to cross a man walking with a speed of 3 km/hr in the direction of the train ? 1536 0

  • 1
    48
    Correct
    Wrong
  • 2
    52
    Correct
    Wrong
  • 3
    38
    Correct
    Wrong
  • 4
    42
    Correct
    Wrong
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Answer : 1. "48"
Explanation :

Answer: A) 48 Explanation: Here distance d = 800 mts speed s = 63 - 3 = 60 kmph = 60 x 5/18 m/s time t = 800x1860x5= 48 sec.

Q: What two countries have nearly 50% of global coal reserves? 1536 0

  • 1
    Iran & USA
    Correct
    Wrong
  • 2
    USA & China
    Correct
    Wrong
  • 3
    Russia & USA
    Correct
    Wrong
  • 4
    Brazil & Russia
    Correct
    Wrong
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Answer : 3. "Russia & USA"
Explanation :

Answer: C) Russia & USA Explanation: United States and Russia have together almost 400 billion tones. Which represents nearly 50% of world's reserves of coal.

Q: What will come in the place of the (?) in the following number series ? 5 14 45 130 (?) 1182 1535 0

  • 1
    222
    Correct
    Wrong
  • 2
    397
    Correct
    Wrong
  • 3
    404
    Correct
    Wrong
  • 4
    415
    Correct
    Wrong
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Answer : 2. "397"
Explanation :

Answer: B) 397 Explanation: The pattern of given series is : 5 14 = (5x3) - 1 45 = (14x3) + 3 130 = (45x3) - 5 (?) = (130x3) + 7 => (?) = 397 1182 = (397x3) - 9 Thus, the missing number is 397.

Q: The law of demand states that other things equal 1535 0

  • 1
    as the price increases, the quantity demanded will decrease.
    Correct
    Wrong
  • 2
    as the price increases, the quantity demanded will increase.
    Correct
    Wrong
  • 3
    as the price decreases, the demand curve will shift to the right.
    Correct
    Wrong
  • 4
    as the price increases, the demand will decrease.
    Correct
    Wrong
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Answer : 1. "as the price increases, the quantity demanded will decrease."
Explanation :

Answer: A) as the price increases, the quantity demanded will decrease. Explanation:

Q: Energy is measured in units called 1535 0

  • 1
    Newtons
    Correct
    Wrong
  • 2
    Watts
    Correct
    Wrong
  • 3
    Joules
    Correct
    Wrong
  • 4
    Ohm/mtr
    Correct
    Wrong
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Answer : 3. "Joules"
Explanation :

Answer: C) Joules Explanation: Energy is measured in units called Joules.   Joule is unit of work or energy in the International System of Units (SI) which is equal to the work done by a force of one newton acting through one metre.   1 Joule  =  107 ergs or 0.7377 foot-pounds.

Q: What is the main purpose of state legislatures? 1534 0

  • 1
    to make and pass laws at the state level
    Correct
    Wrong
  • 2
    to control the legislation of local governments
    Correct
    Wrong
  • 3
    to provide legislative support for Congress
    Correct
    Wrong
  • 4
    to challenge the legality of federal laws
    Correct
    Wrong
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Answer : 1. "to make and pass laws at the state level"
Explanation :

Answer: A) to make and pass laws at the state level Explanation: Each state in the U.S. has a state legislature. The state legislatures main purpose is to make and pass laws at the state level.   An integral part to each state government - indeed where the people of each state are best represented - is the state legislature.   State legislatures are the respective representative bodies for the people of each state. The primary responsibility of any state legislature is to design, draft, and vote on bills and laws to govern each state. Bills and laws generally go through several committees prior to being voted on in the entire assembly, through which the bills and laws are changed, amended, or killed altogether.

Q: What will come in place of the question mark (?) in the following number series? 5, 7, ?, 25, 45, 75 1533 0

  • 1
    11
    Correct
    Wrong
  • 2
    13
    Correct
    Wrong
  • 3
    15
    Correct
    Wrong
  • 4
    19
    Correct
    Wrong
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Answer : 2. "13"
Explanation :

Answer: B) 13 Explanation: The series given follow the pattern   +2, +2+4, +2+4+6, +2+4+6+8, +2+4+6+8+10,...   Here ? = 7 + 2 + 4 = 13.

Q: What element is found in all organic compounds? 1533 0

  • 1
    Hydrogen
    Correct
    Wrong
  • 2
    Calcium
    Correct
    Wrong
  • 3
    Nitrogen
    Correct
    Wrong
  • 4
    Carbon
    Correct
    Wrong
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Answer : 4. "Carbon"
Explanation :

Answer: D) Carbon Explanation: Carbon is found in all organic compounds.

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