IIT JEE Practice Question and Answer

Q: What animals eat both producers and consumers? 1577 0

  • 1
    Herbivores
    Correct
    Wrong
  • 2
    Omnivores
    Correct
    Wrong
  • 3
    Carnivores
    Correct
    Wrong
  • 4
    Tertiary consumers
    Correct
    Wrong
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Answer : 2. "Omnivores"
Explanation :

Answer: B) Omnivores Explanation: Animals and people who eat both animals and plants i.e, both producers and consumers are called omnivores.

Q: Three numbers which are co-prime to each other are such that the product of the first two is 551 and that of the last two is 1073. The sum of the three numbers is : 1577 0

  • 1
    83
    Correct
    Wrong
  • 2
    89
    Correct
    Wrong
  • 3
    85
    Correct
    Wrong
  • 4
    79
    Correct
    Wrong
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Answer : 3. "85"
Explanation :

Answer: C) 85 Explanation: Since the numbers are co-prime, they contain only 1 as the common factor.Also, the given two products have the middle number in common.So, middle number = H.C.F of 551 and 1073 = 29;First number = 551/29 = 19Third number = 1073/29 = 37.Required sum = 19 + 29 + 37 = 85.

Q: Mohan spends 23% of an amount of money on an insurance policy, 33% on food, 19% on children’s education and 16% on recreation. He deposits the remaining amount of Rs. 504 in bank. How much amount does he spend on food and insurance policy together? 1577 0

  • 1
    Rs. 2326
    Correct
    Wrong
  • 2
    Rs. 5876
    Correct
    Wrong
  • 3
    Rs. 1741
    Correct
    Wrong
  • 4
    Rs. 3136
    Correct
    Wrong
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Answer : 4. "Rs. 3136"
Explanation :

Answer: D) Rs. 3136 Explanation: Let total amount = Rs. P Total expenditure = (23 + 33 + 19 + 16)% of P = 91%ofP Remaining money = (100 - 91)% of P = 9% of P But given in the question that, 9% of P = 504 9p/100 = 504 => P = 50400/9 => P = Rs. 5600   Required money spent on Food & Insurance = 23 + 33 % = 56% of 5600 = 56 x 5600/100 = 56 x 56 = Rs. 3136

Q: What is the gram formula mass of Li2SO4? 1577 0

  • 1
    101.2487
    Correct
    Wrong
  • 2
    109.9446
    Correct
    Wrong
  • 3
    111.2687
    Correct
    Wrong
  • 4
    106.5871
    Correct
    Wrong
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Answer : 2. "109.9446"
Explanation :

Answer: B) 109.9446 Explanation: The term gram formula mass is synonymous with molecular mass. So, to get this, we must add molar mass of all the elements in this compound.   Given compound is Lithium Sulphate - Li2SO4 Elemental calculation :: Li  -  Lithium   -   6.941    -     2   -   13.88200 %S  -  Sulfur     -    32.065   -    1   -   32.065 %O  -  Oxygen   -   15.9994  -    4   -   63.9976 % Now, total = 12.6264 + 29.1647 + 58.2090 = 109.9446    Hence, the gram formula mass of Li2SO4 = 109.9446.

Q: Not including the sun, the closest stars to earth are 1576 0

  • 1
    4300 light-years away
    Correct
    Wrong
  • 2
    430 light-years away
    Correct
    Wrong
  • 3
    43 light-years away
    Correct
    Wrong
  • 4
    4.3 light-years away
    Correct
    Wrong
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Answer : 4. "4.3 light-years away"
Explanation :

Answer: D) 4.3 light-years away Explanation: The nearest stars to Earth are in the Alpha Centauri triple-star system, about 4.37 light-years away. One of these stars, Proxima Centauri, is slightly closer, at 4.26 light-years.   Of all the stars closer than 15 light-years, only two are spectral type G, similar to our sun: Alpha Centauri A and Tau Ceti. The majority are M-type red dwarf stars.   Only nine of the stars in this area is bright enough to be seen by the naked human eye from Earth. These brightest stars include Alpha Centauri A and B, Sirius A, Epsilon Eridani, Procyon, 61 Cygni A and B, Epsilon Indi A and Tau Ceti.

Q: Elisa test is employed to diagnose 1576 0

  • 1
    HIV
    Correct
    Wrong
  • 2
    Cancer
    Correct
    Wrong
  • 3
    Tuberculosis
    Correct
    Wrong
  • 4
    Polio
    Correct
    Wrong
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Answer : 1. "HIV"
Explanation :

Answer: A) HIV Explanation: ELISA - Enzyme-Linked Immuno Sorbent Assay.   An ELISA test may be used to diagnose: HIV, which causes AIDS.   An ELISA also called EIA, is a test that detects and measures antibodies in your blood. Antibodies are proteins that your body produces in response to harmful substances called antigens.

Q: Which of the following became widespread during the 1980's? 1576 0

  • 1
    Internet
    Correct
    Wrong
  • 2
    Radio
    Correct
    Wrong
  • 3
    Cable television
    Correct
    Wrong
  • 4
    All the above
    Correct
    Wrong
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Answer : 3. "Cable television"
Explanation :

Answer: C) Cable television Explanation: Cable television or cable TV became widespread during the 1980's.

Q: A can complete 9/10 part of a work in 31 days. After that, with the help of B he can complete the remaining work in 4 days. In how many days will  A and B together can complete that work ? 1576 0

  • 1
    36
    Correct
    Wrong
  • 2
    40
    Correct
    Wrong
  • 3
    42
    Correct
    Wrong
  • 4
    38
    Correct
    Wrong
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Answer : 2. "40"
Explanation :

Answer: B) 40 Explanation: Remaining work = 1 - 9/10 = 1/10   => A & B together completes 1/10 of work in 4 days   => 1 work can completed in ------ ? days   Let it be x days   =>  4110=x1   => x = 40 days.   Hence, A & B together can complete the work in 40 days.

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