IIT JEE Practice Question and Answer

Q: Manideep purchases 30kg of barley at the rate of 11.50/kg and 20kg at the rate of 14.25/kg. He mixed the two and sold the mixture in the shop. At what price per kg should he sell the mixture to make 30% profit to him ? 1736 0

  • 1
    15.84
    Correct
    Wrong
  • 2
    14.92
    Correct
    Wrong
  • 3
    13.98
    Correct
    Wrong
  • 4
    16.38
    Correct
    Wrong
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Answer : 4. "16.38"
Explanation :

Answer: D) 16.38 Explanation: Given, Manideep purchases 30kg of barley at the rate of 11.50/kg nad 20kg at the rate of 14.25/kg. Total cost of the mixture of barley = (30 x 11.50) + (20 x 14.25) => Total cost of the mixture = Rs. 630 Total kgs of the mixture = 30 + 20 = 50kg Cost of mixture/kg = 630/50 = 12.6/kg To make 30% of profit => Selling price for manideep = 12.6 + 30% x 12.6 => Selling price for manideep = 12.6 + 3.78 = 16.38/kg.

Q: A fair coin is tossed 11 times. What is the probability that only the first two tosses will yield heads ? 1736 0

  • 1
    (1/2)^11
    Correct
    Wrong
  • 2
    (9)(1/2)
    Correct
    Wrong
  • 3
    (11C2)(1/2)^9
    Correct
    Wrong
  • 4
    (1/2)
    Correct
    Wrong
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Answer : 1. "(1/2)^11"
Explanation :

Answer: A) (1/2)^11 Explanation: Probability of occurrence of an event,  P(E) = Number of favorable outcomes/Numeber of possible outcomes = n(E)/n(S) ⇒ Probability of getting head in one coin = ½,  ⇒ Probability of not getting head in one coin = 1- ½ = ½,  Hence,  All the 11 tosses are independent of each other. ∴ Required probability of getting only 2 times heads =122×129=1211

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Answer : 4. "50%"
Explanation :

Answer: D) 50% Explanation: Let the salary of Karthik 2 years ago be Rs.100So, Lucky's salary 2 years ago was Rs.50   Karthik's present salary has seen two 10 percent increases. So as Lucky's salary. So, Karthik's salary 1 year ago = 100 + 10% of 100 = 100 + 10 = 110.Karthik's present salary = 110 + 10% of 110 = 110 + 11 = 121.   Lucky's salary 1 year ago = 50 + 10% of 50 = 50 + 5 = 55Lucky's present salary = 55 + 10% of 55 = 55 + 5.5 = 60.5   Lucky's present salary of 60.5 = 50% of Karthik's present salary of 121.

Q: Antonym of the given word abet 1736 0

  • 1
    Risk
    Correct
    Wrong
  • 2
    Pacify
    Correct
    Wrong
  • 3
    Aid
    Correct
    Wrong
  • 4
    Prevent
    Correct
    Wrong
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Answer : 4. "Prevent"
Explanation :

Answer: D) Prevent Explanation:

Q: What gets bigger the more you take away? 1736 0

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Answer :
Explanation :

A Hole gets bigger and bigger as you take more away from it.

Q: In economics, if a good is inelastic, 1736 0

  • 1
    its supply or demand is not sensitive to price changes.
    Correct
    Wrong
  • 2
    consumers have lost an interest in purchasing it.
    Correct
    Wrong
  • 3
    producers have lost an interest in manufacturing it.
    Correct
    Wrong
  • 4
    its supply or demand is too sensitive to price changes.
    Correct
    Wrong
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Answer : 1. "its supply or demand is not sensitive to price changes."
Explanation :

Answer: A) its supply or demand is not sensitive to price changes. Explanation: A good that is inelastic does not have very stretchy demand. In economic terms, the quantity demanded does not change a lot when the price changes. What do I mean by "does not change a lot"? If the percent change in quantity demanded is less than the percent change in price, economists label the demand for the good as inelastic.   So, if the price of a good increases by 10 percent and the quantity demanded decreases by only 5 percent, that good is said to have inelastic demand. The quantity demanded does not stretch much relative to the change in price.   Hence, in this case, consumers are not considered very sensitive, or responsive, to a change in the price of that good.

Q: What role does Dalvik play in Android development ? 1735 0

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Answer :
Explanation :

Dalvik serves as a virtual machine, and it is where every Android application runs. Through Dalvik, a device is able to execute multiple virtual machines efficiently through better memory management.

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Answer :
Explanation :

Here If you notice the difference, There is no question mark (?) at the end of the puzzle. In that case, "What" is the name of the 5th child.

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