IIT JEE Practice Question and Answer

Q: If  1 1 1 1 = R    2 2 2 2 = T    3 3 3 3 = E    4 4 4 4 = N   Then  5 5 5 5 = ? 1274 0

  • 1
    Y
    Correct
    Wrong
  • 2
    Z
    Correct
    Wrong
  • 3
    T
    Correct
    Wrong
  • 4
    X
    Correct
    Wrong
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Answer : 1. "Y"
Explanation :

Answer: A) Y Explanation: If you add all the terms of the LHS of equality, then the last letter of the sum written in words would give you the RHS. 1 + 1 + 1 + 1 = 4 = FOUR 2 + 2 + 2 + 2 = 8 = EIGHT 3 + 3 + 3 + 3 = 12 = TWELVE 4 + 4 + 4 + 4 = 16 = SIXTEEN   So, following the same pattern. 5 + 5 + 5 + 5 = 20 = TWENTY   That gives us our answer to 5 5 5 5 =  "Y".

Q: How long would it take to travel 4 light years? 1273 0

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Answer :
Explanation :

There are approximately 6 trillion miles in a light-year, so the distance we need to go is 6 trillion miles / light-year times. 4 light-years is equal to 24 trillion miles. So, this whole would take 1.2 billion hours. There are 24 hours a day and 365.25 days per year, so this time in years is 137 thousand years.

Q: Nipah virus outbreak in Bangladesh in the year 1272 0

  • 1
    2001
    Correct
    Wrong
  • 2
    2006
    Correct
    Wrong
  • 3
    2012
    Correct
    Wrong
  • 4
    2015
    Correct
    Wrong
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Answer : 1. "2001"
Explanation :

Answer: A) 2001 Explanation: The first identification of Nipah virus as a cause of an outbreak of encephalitis was reported in 2001 in Meherpur district of Bangladesh. Since, then Outbreaks of the deadly Nipah virus has been recorded almost every year in selected districts of Bangladesh.   Drinking raw date palm sap and contact with a case were identified as the major risk factors for acquiring the disease.

Q: In How many ways can the letters of the word 'CAPITAL' be arranged in such a way that all the vowels always come together? 1272 0

  • 1
    360
    Correct
    Wrong
  • 2
    720
    Correct
    Wrong
  • 3
    120
    Correct
    Wrong
  • 4
    840
    Correct
    Wrong
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Answer : 1. "360"
Explanation :

Answer: A) 360 Explanation: CAPITAL = 7   Vowels = 3 (A, I, A)   Consonants = (C, P, T, L)   5 letters which can be arranged in  5P5=5!   Vowels A,I = 3!2!   No.of arrangements = 5! x 3!2!=360

Q: 3/4 divided by 2 is 1271 0

  • 1
    3/2
    Correct
    Wrong
  • 2
    2/3
    Correct
    Wrong
  • 3
    8/3
    Correct
    Wrong
  • 4
    3/8
    Correct
    Wrong
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Answer : 4. "3/8"
Explanation :

Answer: D) 3/8 Explanation: 3/4 divided by 2 = 3/4/2 = 3/4x2 = 3/8.   Hence, 3/4 divided by 2 is equal to 3/8.

Q: What are the Multiples of 18? 1271 0

  • 1
    144
    Correct
    Wrong
  • 2
    72
    Correct
    Wrong
  • 3
    306
    Correct
    Wrong
  • 4
    All the above
    Correct
    Wrong
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Answer : 4. "All the above"
Explanation :

Answer: D) All the above Explanation: The Multiples of 18 are 18, 36, 54, 72, 90, 108, 126, ....   Multiples of 18 are nothing but numbers which are divisible by 18 leaving remainder 0.   An infinite number of multiples of 18 can be achieved by adding 18 to each subsequent multiple.

Q: Intermolecular forces in HCl are 1271 0

  • 1
    Hydrogen bonding
    Correct
    Wrong
  • 2
    Dipole-dipole
    Correct
    Wrong
  • 3
    Dispersion force
    Correct
    Wrong
  • 4
    All the above
    Correct
    Wrong
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Answer : 4. "All the above"
Explanation :

Answer: D) All the above Explanation: Intermolecular forces : The forces of attraction present in between the molecules or atoms or compounds is termed as intermolecular forces. The molecule HCl is composed of hydrogen and chlorine atom. There is high difference in electronegativities therefore, it is polar in nature. The H end of HCl is permanently slightly positive charge. The Cl end of HCl has a permanent slight negative charge. the "H" in one molecule is attracted to the "Cl" in a neighbor. The intermolecular force is weak compared to a covalent bond. But this dipole-dipole interaction is one of the stronger intermolecular attractions. It also has hydrogen bonding and dispersion forces.  Dispersion forces are the weakest forces which are present in between all molecules or atoms.Hydrogen bonds are present in molecules having at least one H-A bond where A is the strong electronegative atom (mainly F, Cl and N).

Q: The price of 2 oranges, 3 bananas and 4 apples is Rs. 15. The price of 3 oranges, 2 bananas and 1 apple is Rs. 10. What will be price of 4 oranges, 4 bananas and 4 apples  ? 1270 0

  • 1
    Rs. 10
    Correct
    Wrong
  • 2
    Rs. 15
    Correct
    Wrong
  • 3
    Rs. 20
    Correct
    Wrong
  • 4
    Rs. 25
    Correct
    Wrong
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Answer : 3. "Rs. 20"
Explanation :

Answer: C) Rs. 20 Explanation: Let the Oranges be 'O', Bananas be 'B' and Apples be 'A' From the given data,   2O + 3B + 4A = 15 ...... (I) 3O + 2B + A = 10 ..... (II) On adding (I) and (II), 5O + 5B + 5A = 25 O + B + A = 5 4O + 4B + 4A = 20.

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