IIT JEE Practice Question and Answer

Q: 5 years ago Sushma was 5 times as old as her Son. 5 years hence her age will be 8 less than three times the corresponding age of her Son. Find their ages ? 3296 0

  • 1
    24 and 13 years
    Correct
    Wrong
  • 2
    48 and 24 years
    Correct
    Wrong
  • 3
    35 and 11 years
    Correct
    Wrong
  • 4
    33 and 15 years
    Correct
    Wrong
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Answer : 3. "35 and 11 years"
Explanation :

Answer: C) 35 and 11 years Explanation: Let the age of sushma be x and the age of her son is yThen five years before x-5=5(y-5) ...(1)Five years hence x+5 = 3(y+5)-8 .....(2) By soving (1) & (2), we get5y - 15 = 3y + 7y = 11 => x = 35 Therefore, the age of Sushma = 35 and her son = 11.

Q: Study of the sun is called 3295 0

  • 1
    Coronagraphy
    Correct
    Wrong
  • 2
    Seismography
    Correct
    Wrong
  • 3
    Helioseismology
    Correct
    Wrong
  • 4
    Heliography
    Correct
    Wrong
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Answer : 3. "Helioseismology"
Explanation :

Answer: C) Helioseismology Explanation: Helioseismology is the study of the solar interior using observations of waves on the Sun's surface. It has done much to improve our understanding of the interior of the Sun, testing the physical inputs used to model stellar interiors and providing a detailed map of the Sun's structure and internal rotation.

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Answer :
Explanation :

They walked and did this. It was never specified that the boat was at sea. Since this logic is observed by them to tackle situation.

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Answer : 3. "J"
Explanation :

Answer: C) J Explanation: Given word is TIRADESNow the consonants T, R, D, S are replaced by S, Q, C, RAnd Vowels are I, A, E are replaced by J, B and FThey are arranged alphabeticallyNew word is BCFJQRS The fourth letter from the right end is J.

Q: When water freezes its density 3288 0

  • 1
    decreases
    Correct
    Wrong
  • 2
    remains constant
    Correct
    Wrong
  • 3
    increases
    Correct
    Wrong
  • 4
    become zero
    Correct
    Wrong
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Answer : 1. "decreases"
Explanation :

Answer: A) decreases Explanation: When water freezes its density decreases. Water at ordinary temperatures contracts and increases in density as it is cooled, like most substances. But at about 4°C it reaches a maximum density and then decreases in density as it approaches the freezing point.

Q: Guwahati High Court is the Judicature of 3284 0

  • 1
    Arunachal Pradesh
    Correct
    Wrong
  • 2
    Nagaland
    Correct
    Wrong
  • 3
    Assam
    Correct
    Wrong
  • 4
    All the above
    Correct
    Wrong
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Answer : 4. "All the above"
Explanation :

Answer: D) All the above Explanation:

Q: Which is the World's Fastest SUPERCOMPUTER and to which country it belongs ? 3276 2

  • 1
    JAGUAR --- ENGLAND
    Correct
    Wrong
  • 2
    PARAM YUVA 2 --- INDIA
    Correct
    Wrong
  • 3
    CRAY-1 --- ENGLAND
    Correct
    Wrong
  • 4
    TIANHE 2 --- CHINA
    Correct
    Wrong
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Answer : 4. "TIANHE 2 --- CHINA"
Explanation :

Answer: D) TIANHE 2 --- CHINA Explanation:

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Answer : 4. "31"
Explanation :

Answer: D) 31 Explanation: Let y be the total number of loavesa be the remaining loaves after 1st thiefb be the remaining loaves after 2nd thiefand c, d..so on after 3 and 4 the = 0 be the remaining loaves after 5th thief a = y - (y/2 + 1/2)= y/2 - 1/2 b = a - (a/2 + 1/2)= a/2 - 1/2 c = b - (b/2 + 1/2)= b/2 - 1/2 d = c - (c/2 + 1/2)= c/2 - 1/2 e = d - (d/2 + 1/2)= d/2 - 1/2we know that, e = 0,thus by substitution, we getd = 1c = 3b = 7a = 15y = 31Therefore total number of bread loaves in bakery was 31.

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