IIT JEE Practice Question and Answer

Q: 92613 x 62742241 = ? + 89 Find the value of '?' 1810 0

  • 1
    166251
    Correct
    Wrong
  • 2
    166259
    Correct
    Wrong
  • 3
    166252
    Correct
    Wrong
  • 4
    166253
    Correct
    Wrong
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Answer : 3. "166252"
Explanation :

Answer: C) 166252 Explanation: Given 92613 x 62742241 = ? + 89   Using unit digit method,   On LHS,   1 x 1 x 1 = 1   sqrt of last digit 1 => it must end with either 9 or 1   so now   1 x 1 = 1   1 x 9 = 9   On RHS,   ? + 89   => ? = ...1 - 89 = last digit is 11- 9 = 2   or   => ? = ...9 - 89 = last digit is 9 - 9 = 0   Here in the options last digit 2 is option C.

Q: GDPR means 1809 0

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    General Data Protection Regulation
    Correct
    Wrong
  • 2
    Generic Data Per Random
    Correct
    Wrong
  • 3
    Generic Data Protection Regulation
    Correct
    Wrong
  • 4
    Gross Data Protection Regulation
    Correct
    Wrong
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Answer : 1. "General Data Protection Regulation"
Explanation :

Answer: A) General Data Protection Regulation Explanation: GDPR stands for the General Data Protection Regulation. The GDPR is a piece of EU legislation passed by the European Parliament in 2016.   It aims to make it simpler for people to control how companies use their personal details. Companies will not be allowed to collect and use personal information without the person's consent. Data includes things like a person's name, email address and phone number, and also internet browsing habits collected by website cookies.

Q: Absolute value of 9? 1809 0

  • 1
    0
    Correct
    Wrong
  • 2
    9
    Correct
    Wrong
  • 3
    8
    Correct
    Wrong
  • 4
    -9
    Correct
    Wrong
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Answer : 2. "9"
Explanation :

Answer: B) 9 Explanation: Absolute value of a number : It means that the distance of a number from 0 on a number line.    Here absolute value of 9 is that on a number line 9 is 9 units away from 0. Hence its absolute value is 9. Similarly, absolute value of -9 means -9 is also 9 units away from the 0 on number line. Hence, absolute value of -9 is also 9.   Hence, the absolute value of 9 is 9.

Q: Madhu got 32% of the maximum marks in a Bank examination and failed by 8 marks. However, Kumar who took the same examination got 42% of the total marks and got 16 marks more than the cut-off marks. What was the cut-off marks in the examination ? 1809 0

  • 1
    76.8
    Correct
    Wrong
  • 2
    86.8
    Correct
    Wrong
  • 3
    78.8
    Correct
    Wrong
  • 4
    84.8
    Correct
    Wrong
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Answer : 4. "84.8"
Explanation :

Answer: D) 84.8 Explanation: Let 'M' be the maximum marks in the examination. Therefore, Madhu got 32% of M = 32M/100 = 0.32MAnd Kumar got 42% of M = 42M/100 = 0.42M.In terms of the maximum marks Kumar got 0.42M - 0.32M = 0.1M more than Madhu. ---- (1) The problem however, states that Kumar got 16 marks more than the cut-off mark and Madhu got 8 marks less than the cut-off mark. Therefore, Kumar has got 16 + 8 = 24 marks more than Madhu. ---- (2) Now, Equating (1) and (2), we get0.1M = 24 => M = 24/0.1 = 240'M' is the maximum mark and is equal to 240 marks.We know that Madhu got 32% of the maximum marks.Therefore, Madhu got 32 x 240/100 = 76.8 marks.We also know that Madhu got 8 marks less than the cut-off marks. Therefore, the cut-off marks will be 8 marks more than what Madhu got = 76.8 + 8 = 84.8.

Q: A group of 1200 persons consisting of boys and girls is travelling in a Bus. For every 15 boys there is one girl. The number of girls in the group is ? 1809 0

  • 1
    60
    Correct
    Wrong
  • 2
    65
    Correct
    Wrong
  • 3
    70
    Correct
    Wrong
  • 4
    75
    Correct
    Wrong
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Answer : 4. "75"
Explanation :

Answer: D) 75 Explanation: If there are x girls, then x + 15x = 120016x = 1200x= 1200/16 = 75

Q: The element common to all Acids is 1809 0

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

Answer: C) Hydrogen Explanation: Hydrogen is the common element to all Acids. But every element which contains Hydrogen is not an Acid. Most of the acids also contain Oxygen.

Q: A wholesale dealer allows a discount of 20 % on the marked price to the retailer. The retailer sells at 5% below the marked price. If the customer pays Rs.19 for an article, what profit is made by the retailer on it ? 1808 0

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

Answer: B) Rs. 3 Explanation: Let wholesaler dealers marked price = 100%, Retailer's C.P = 80% And the retailer sells at 5% less than the marked price => S.P = 95%If S.P of 95% of the retailer costs Rs.19 to customer,so its C.P of 80% will cost 80 x 19/95 = 16 Profit made by the retailer = 19-16 =  Rs.3

Q: What animal has the highest blood pressure? 1808 0

  • 1
    Elephant
    Correct
    Wrong
  • 2
    Giraffe
    Correct
    Wrong
  • 3
    Lion
    Correct
    Wrong
  • 4
    Rabbit
    Correct
    Wrong
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Answer : 2. "Giraffe"
Explanation :

Answer: B) Giraffe Explanation: Giraffe has the highest blood pressure among animals.  This is due to the fact that there is a large pressure drop (~100 mmhg) as the blood is transported from the heart, up the neck, to the brain. This is about twice the normal blood pressure of humans (120/80 mmhg).

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