IIT JEE Practice Question and Answer

Q: Consumers that eat both plants and animals are 1607 0

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

Answer: C) Omnivores Explanation: An omnivore is an animal that eats food from both plants and animals. Animals that eat other animals are called carnivores. Carnivores that eat herbivores are called secondary consumers, and carnivores that eat other carnivores are called tertiary consumers.

Q: Which formula represents a nonpolar molecule? 1607 0

  • 1
    H2O
    Correct
    Wrong
  • 2
    CF4
    Correct
    Wrong
  • 3
    HCl
    Correct
    Wrong
  • 4
    H2S
    Correct
    Wrong
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Answer : 2. "CF4"
Explanation :

Answer: B) CF4 Explanation: You have to consider three things. 1. First, are the bonds polar? Look at differences in electronegativity and if  it is >0.5, bonds are polar.   2. Second, does the molecule have unshared electron pairs? If so, they generally lead to a polar molecule.   3. Third, is the molecule symmetric? If so, then although the bonds may be polar, the symmetry cancels out the individual bond polarity and the molecule is non polar. CF4 follows all the rules above and has a symmetric distribution of charge, making it nonpolar. The others all have asymmetric charge distributions.   Hence, CF4 represents a Non-polar molecule.

Q: LCD of 12 and 18 1607 0

  • 1
    36
    Correct
    Wrong
  • 2
    42
    Correct
    Wrong
  • 3
    12
    Correct
    Wrong
  • 4
    6
    Correct
    Wrong
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Answer : 1. "36"
Explanation :

Answer: A) 36 Explanation:   LCD is nothing but Lowest or Least Common Denominator   Here LCD of 12 and 18 means LCD of two fractions with denominators 12 and 18 respectively.   Therefore, LCM of 12 & 18 = 6 x 3 x 2 = 36     How to calculate LCD :: The lowest common denominator or least common denominator (LCD) is the least common multiple (LCM) of the denominators of a set of fractions.

Q: Find the Missing number in the given Series ?   2, 3, 6, 15, ? , 157.5 1607 0

  • 1
    87
    Correct
    Wrong
  • 2
    78.5
    Correct
    Wrong
  • 3
    56.5
    Correct
    Wrong
  • 4
    45
    Correct
    Wrong
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Answer : 4. "45"
Explanation :

Answer: D) 45 Explanation: Here given  2, 3, 6, 15, ? , 157.5 2 x 1.5 = 3 3 x 2  = 6 6 x 2.5 = 15 15 x 3 = 45 45 x 3.5 = 157.5 Therefore, the missing number is 45

Q: Which player has won the Gold Medal at World Badminton Championship 2017 ? 1606 0

  • 1
    Nozomi Okuhara
    Correct
    Wrong
  • 2
    Saina Nehwal
    Correct
    Wrong
  • 3
    Carolina Marin
    Correct
    Wrong
  • 4
    P V Sindhu
    Correct
    Wrong
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Answer : 1. "Nozomi Okuhara"
Explanation :

Answer: A) Nozomi Okuhara Explanation:

Q: Ozone is concentrated in the 1606 0

  • 1
    Stratosphere
    Correct
    Wrong
  • 2
    Troposphere
    Correct
    Wrong
  • 3
    Ionosphere
    Correct
    Wrong
  • 4
    Mesosphere
    Correct
    Wrong
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Answer : 1. "Stratosphere"
Explanation :

Answer: A) Stratosphere Explanation: Most of the ozone in the atmosphere is found in the layer of stratosphere, which begins about 10.16 kilometers (6.10 miles) above Earth's surface and extends up to about 50 kilometers (31 miles) altitude.

Q: Where do arteries carry blood? 1606 0

  • 1
    Heart
    Correct
    Wrong
  • 2
    Lungs
    Correct
    Wrong
  • 3
    Tissues
    Correct
    Wrong
  • 4
    Brain
    Correct
    Wrong
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Answer : 1. "Heart"
Explanation :

Answer: A) Heart Explanation: Arteries carry oxygenated blood away from the heart to the tissues, except for pulmonary arteries, which carry blood to the lungs for oxygenation (usually veins carry deoxygenated blood to the heart but the pulmonary veins carry oxygenated blood as well).

Q: Rs. 50000 is divided into two parts One part is given to a person with 10% interest and another part is given to a person with 20 % interest. At the end of first year he gets profit 7000 Find money given by 10% ? 1606 0

  • 1
    Rs. 20,000
    Correct
    Wrong
  • 2
    Rs. 10,000
    Correct
    Wrong
  • 3
    Rs. 30,000
    Correct
    Wrong
  • 4
    Rs. 40,000
    Correct
    Wrong
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Answer : 3. "Rs. 30,000"
Explanation :

Answer: C) Rs. 30,000 Explanation: Let first part is 'K' and second part is 'L' then K + L = 50000---------eq1Total profit = profit on x + profit on y7000 = (K x 10 x 1)/100 + (L x 20 x 1)/10070000 = K + 2L-----------------------------------eq270000 = 50000 + Lso L = 20000 then K = 50000 - 20000 = 30000first part on 10% is = Rs.30000

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