IIT JEE Practice Question and Answer

Q: What is true about certificates of deposit? 1379 0

  • 1
    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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Answer :
Explanation :

Out of 4 fruits, any 3 are chosen by 4 families.So the combinations areApple - A Cherries - C Banana - B Grapes - G1) ACB2) ACG3) BCG4) GAB By 2nd condition, Miller family uses either i)ACB or ii)ACGNow we have Robin, Mandy and Miller who uses apples (ACB,ACG,GAB)while Miller and Mandy both uses A and C. That leaves GAB for Robin. By 3rd condition Flure uses either C or G. So if we leave out the terms containing both C and G, we are left with ACB and GAB Now, for the time being let's suppose Robin is not a Flure.So ACB is taken by Flure. So ACG has to be Miller and that leaves BCG to be Clark. So we get Robin - Jacob(GAB). By 4th and 2nd conditions Erica and Mandy belong to the first two. That leaves Stacy - Clark(BCG). By 2nd condition Mandy is not a Miller, so we get Mandy - Flure(ACB) and that leaves Erica - Miller(ACG).

Q: K men agree to donate a gift of Rs. L to trust. If three men drop out how much more will each have to contribute towards the purchase of the gift ? 1379 0

  • 1
    L / (k-3)
    Correct
    Wrong
  • 2
    k / (L-3)
    Correct
    Wrong
  • 3
    2K / 3L-K
    Correct
    Wrong
  • 4
    3L / K(K-3)
    Correct
    Wrong
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Answer : 4. "3L / K(K-3)"
Explanation :

Answer: D) 3L / K(K-3) Explanation: Intial contribution = L/KAfter 3 men drop, then contribution =L/K-3The amount more to pay in contribution = LK-3 - LK   = 3LK(K-3)

Q: Nucleotides are attached by bonds between the 1379 0

  • 1
    phosphates and sugars
    Correct
    Wrong
  • 2
    nitrates and sugars
    Correct
    Wrong
  • 3
    nitrates and phosphates
    Correct
    Wrong
  • 4
    sugars and hydrates
    Correct
    Wrong
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Answer : 1. "phosphates and sugars"
Explanation :

Answer: A) phosphates and sugars Explanation: In DNA, adjacent nucleotides are linked by a phosphodiester bond: a covalent bond is formed between the 5' phosphate group of one nucleotide and the 3'-OH group of another.   Hence, in this manner, each strand of DNA has a "backbone" of phosphate-sugar-phosphate-sugar-phosphate.

Q: In what ratio must a merchant mix two varieties of oils worth Rs. 60/kg and Rs. 65/kg, so that by selling the mixture at Rs. 68.20/kg, he may gain 10% ? 1378 0

  • 1
    2:3
    Correct
    Wrong
  • 2
    4:3
    Correct
    Wrong
  • 3
    3:4
    Correct
    Wrong
  • 4
    3:2
    Correct
    Wrong
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Answer : 4. "3:2"
Explanation :

Answer: D) 3:2 Explanation: Let he mixes the oils in the ratio = x : y Then, the cost price of the oils = 60x + 65y Given selling price = Rs. 68.20 => Selling price = 68.20(x+y) Given profit = 10% = SP - CP => 10/100 (60x + 65y) = 68.20(x+y)-(60x + 65y) => 6x + 6.5y = 8.20x + 3.20y =>2.2x = 3.3y => x : y = 3 : 2

Q: Light travels slowest in 1378 0

  • 1
    Glass
    Correct
    Wrong
  • 2
    Water
    Correct
    Wrong
  • 3
    Air
    Correct
    Wrong
  • 4
    Vacuum
    Correct
    Wrong
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Answer : 1. "Glass"
Explanation :

Answer: A) Glass Explanation: Because the refractive index of glass is highest, light travels slowly in Glass.  We know that the speed of light depends on the refraction index. The higher the index of refraction is, the slower the speed of light is. R.I of air and vacuum = 0 (air is a teeny bit more but can be taken as 0) R.I of water = 1.33 R.I of glass = 1.4.   Hence, Light travels slowest in Glass.

Q: Who is the 14th President of India ? 1378 0

  • 1
    Meira Kumar
    Correct
    Wrong
  • 2
    Sreedharan
    Correct
    Wrong
  • 3
    Ram Nath Kovind
    Correct
    Wrong
  • 4
    Vaidyanathan
    Correct
    Wrong
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Answer : 3. "Ram Nath Kovind"
Explanation :

Answer: C) Ram Nath Kovind Explanation: BJP-led NDA's presidential candidate Ram Nath Kovind registered an emphatic win over his rival and Opposition candidate Meira Kumar. Succeeding Pranab Mukherjee, Kovind sworn in as the 14th president of India on July 25, 2017.

Q: Which of the following is true about veins? 1378 0

  • 1
    Veins carry blood away from the heart, while arteries carry blood to the heart.
    Correct
    Wrong
  • 2
    Veins are more muscular than arteries.
    Correct
    Wrong
  • 3
    Veins have valves; arteries do not.
    Correct
    Wrong
  • 4
    Veins have a smaller diameter lumen than arteries.
    Correct
    Wrong
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Answer : 3. "Veins have valves; arteries do not."
Explanation :

Answer: C) Veins have valves; arteries do not. Explanation: Veins are blood vessels that carry blood toward the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated blood to the heart. In contrast to veins, arteries carry blood away from the heart.   Veins are less muscular than arteries and are often closer to the skin. There are valves in most veins to prevent backflow.

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