IIT JEE Practice Question and Answer

Q: Ticks and mites are actually 1488 0

  • 1
    Arachnids
    Correct
    Wrong
  • 2
    Insects
    Correct
    Wrong
  • 3
    Myriapods
    Correct
    Wrong
  • 4
    Crustaceans
    Correct
    Wrong
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Answer : 1. "Arachnids"
Explanation :

Answer: A) Arachnids Explanation:

Q: 6 : 18 :: 4 : ? 1487 0

  • 1
    14
    Correct
    Wrong
  • 2
    6
    Correct
    Wrong
  • 3
    16
    Correct
    Wrong
  • 4
    8
    Correct
    Wrong
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Answer : 4. "8"
Explanation :

Answer: D) 8 Explanation: Here the given number analogy follows two patterns that, 6  18 --> 6 x 3 4 12 --> 4 x 3   OR 6 18 ----> 6x6/2 = 18 4 8 ----> 4x4/2 = 8   As 12 is not available in the options, 8 is correct answer.

Q: What is the conjugate base of H2O? 1486 0

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    NH3+
    Correct
    Wrong
  • 2
    OH-
    Correct
    Wrong
  • 3
    H2O
    Correct
    Wrong
  • 4
    All the above
    Correct
    Wrong
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Answer : 2. "OH-"
Explanation :

Answer: B) OH- Explanation: A conjugate acid, is a species formed by the reception of a proton (H+) by a base—in other words, it is a base with a hydrogen ion added to it. On the other hand, a conjugate base is what is left over after an acid has donated a proton during a chemical reaction. Hence, a conjugate base is a species formed by the removal of a proton from an acid. Because some acids are capable of releasing multiple protons, the conjugate base of an acid may itself be acidic. Represented as the following chemical reaction: Acid + Base ⇌ Conjugate Base + Conjugate Acid   The water molecule is the conjugate acid of the hydroxide ion after the latter received the hydrogen proton donated by ammonium. On the other hand, ammonia is the conjugate base for the acid ammonium after ammonium has donated a hydrogen ion towards the production of the water molecule. We can also refer to OH- as a conjugate base of H2O, since the water molecule donates a proton towards the production of NH+4 in the reverse reaction, which is the predominating process in nature due to the strength of the base NH3 over the hydroxide ion.

Q: What is the difference between the compound interests on Rs. 5000 for 11⁄2 years at 4% per annum compounded yearly and half-yearly? 1486 0

  • 1
    Rs. 1.80
    Correct
    Wrong
  • 2
    Rs. 2.04
    Correct
    Wrong
  • 3
    Rs. 3.18
    Correct
    Wrong
  • 4
    Rs. 4.15
    Correct
    Wrong
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Answer : 2. "Rs. 2.04"
Explanation :

Answer: B) Rs. 2.04 Explanation: Compound Interest for 1 1⁄2 years when interest is compounded yearly = Rs.(5304 - 5000) Amount after 11⁄2 years when interest is compounded half-yearly Compound Interest for 1 1⁄2 years when interest is compounded half-yearly = Rs.(5306.04 - 5000) Difference in the compound interests = (5306.04 - 5000) - (5304 - 5000)= 5306.04 - 5304 = Rs. 2.04

Q: Rajeev's age is four more than the age of Shilpa. The age of Shilpa can be obtained by subtracting four times her age 4 years ago from the four times her age after 4 years. What was Rajeev's age before 4 years ? 1485 0

  • 1
    36 years
    Correct
    Wrong
  • 2
    28 years
    Correct
    Wrong
  • 3
    32 years
    Correct
    Wrong
  • 4
    40 years
    Correct
    Wrong
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Answer : 3. "32 years"
Explanation :

Answer: C) 32 years Explanation: Let Shilpa's present age is p years According to question, p = 4(x+4) – 4(x–4) p = 4x+16 – 4x+16 p = 32 Shilpa's present age = 32 years Rajeev is four years older than Shilpa => Shilpa's present age = Rajeev's age 4 years before. => Rajeev's age 4 years before = 32 years.

Q: How many weekends in a year? 1485 0

  • 1
    52
    Correct
    Wrong
  • 2
    53
    Correct
    Wrong
  • 3
    103
    Correct
    Wrong
  • 4
    104
    Correct
    Wrong
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Answer : 4. "104"
Explanation :

Answer: D) 104 Explanation: In normal we have 104 Weekend Days. We know that a Each normal year has 365 days or 52 weeks plus one day, and each week has two weekend days, which means there are approximately 104 weekend days each year. Whereas in a leap year we have 366 days it adds one more day to the year. And what makes the change is the starting day of the year.

Q: In the expansion phase of a business cycle 1483 0

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    economy moves from peak to trough
    Correct
    Wrong
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    economy moves from contraction to peak
    Correct
    Wrong
  • 3
    economy moves from trough to peak
    Correct
    Wrong
  • 4
    economy moves from trough to trough
    Correct
    Wrong
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Answer : 3. "economy moves from trough to peak"
Explanation :

Answer: C) economy moves from trough to peak Explanation: Business cycles are identified as having four distinct phases: 1. Expansion, 2. Peak, 3. Contraction, and 4. Trough. Expansion is the phase of the business cycle when the economy moves from a trough to a peak. It is a period when the level of business activity surges and gross domestic product (GDP) expands until it reaches a peak. A period of expansion is also known as an economic recovery. An expansion is characterized by increasing employment, economic growth, and upward pressure on prices.

Q: What is true about certificates of deposit? 1483 0

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    the money has to remain in the account for a specified period of time
    Correct
    Wrong
  • 2
    they are the most liquid account available
    Correct
    Wrong
  • 3
    they offer lower interest rates than savings accounts
    Correct
    Wrong
  • 4
    All the above
    Correct
    Wrong
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Answer : 1. "the money has to remain in the account for a specified period of time"
Explanation :

Answer: A) the money has to remain in the account for a specified period of time Explanation: A certificate of deposit (CD) is a savings certificate with a fixed maturity date, specified fixed interest rate and can be issued in any denomination aside from minimum investment requirements. CD's are generally issued by commercial banks

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