IIT JEE Practice Question and Answer

Q: The New Chief Minister of Himachal Pradesh 2017? 1608 0

  • 1
    Anil Sharma
    Correct
    Wrong
  • 2
    Jairam Thakur
    Correct
    Wrong
  • 3
    Sudhir Sharma
    Correct
    Wrong
  • 4
    Karan Singh
    Correct
    Wrong
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Answer : 2. "Jairam Thakur"
Explanation :

Answer: B) Jairam Thakur Explanation: Jairam Thakur was sworn-in as the Chief Minister of Himachal Pradesh on 27th December 2017 after virbhadra Singh. The cabinet, including Thakur, were administered the oath of office and secrecy by Governor Acharya Dev Vrat at the historic Ridge Ground in Shimla, the capital city of Himachal Pradesh.   Jai Ram is the first chief minister from the second largest Mandi district and the 14th chief minister and sixth person to adorn the office of the chief minister.

Q: Which combination of atoms can form a polar covalent bond? 1608 0

  • 1
    H and Br
    Correct
    Wrong
  • 2
    H and H
    Correct
    Wrong
  • 3
    Na and Br
    Correct
    Wrong
  • 4
    N and N
    Correct
    Wrong
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Answer : 1. "H and Br"
Explanation :

Answer: A) H and Br Explanation: Only H and Br form Polar Covalent Bond.   Covalent bonding: Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability. 1. Polar Covalent Bond 2. Nonpolar Covalent Bond   1. Polar Covalent Bond: A Polar Covalent Bond is created when the shared electrons between atoms are not equally shared. This occurs when one atom has a higher electronegativity than the atom it is sharing with. The atom with the higher electronegativity will have a stronger pull for electrons (Similiar to a Tug-O-War game, whoever is stronger usually wins). As a result, the shared electrons will be closer to the atom with the higher electronegativity, making it unequally shared.   2. Nonpolar Covalent Bond: A Nonpolar Covalent Bond is created when atoms share their electrons equally. This usually occurs when two atoms have similar or the same electron affinity. The closer the values of their electron affinity, the stronger the attraction. This occurs in gas molecules; also known as diatomic elements. Nonpolar covalent bonds have a similar concept as polar covalent bonds; the atom with the higher electronegativity will draw away the electron from the weaker one.   Here H and H and N and N form Non-polar covalent bonds. Na and Br form the ionic bond.

Q: Logic Challenge 1608 0

  • 1
    40
    Correct
    Wrong
  • 2
    20
    Correct
    Wrong
  • 3
    2
    Correct
    Wrong
  • 4
    36
    Correct
    Wrong
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Answer : 3. "2"
Explanation :

Answer: C) 2 Explanation: In the starting it is given that Couple went to the movie and No other went with them. So total members went to movie is only 2.

Q: To buy goods on credit means to 1607 0

  • 1
    promise to pay for goods later.
    Correct
    Wrong
  • 2
    pay only a discount price.
    Correct
    Wrong
  • 3
    promise to pay only a sale price.
    Correct
    Wrong
  • 4
    pay cash for goods.
    Correct
    Wrong
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Answer : 1. "promise to pay for goods later."
Explanation :

Answer: A) promise to pay for goods later. Explanation: If as a business, you buy goods or services on credit from a supplier (accounts payable) then the supplier will supply the goods and business will incur a liability to the supplier for that amount, but no cash will change hands at that stage. Some of those shop keepers allowed regular "trustworthy" customers to purchase items without having the full payment. Hence, Buying on credit means that no actual money has changed hands.

Q: Highest Jute producing state in India? 1607 0

  • 1
    Gujarat
    Correct
    Wrong
  • 2
    West Bengal
    Correct
    Wrong
  • 3
    Uttar Pradesh
    Correct
    Wrong
  • 4
    Bihar
    Correct
    Wrong
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Answer : 2. "West Bengal"
Explanation :

Answer: B) West Bengal Explanation: West Bengal is the highest Jute producing state in India followed by Bihar and Assam in second and third place. Gujarat is the largest Cotton producing state in India.

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Answer : 4. "100 min"
Explanation :

Answer: D) 100 min Explanation: Work done by the third pipe in 1 min = 1/50 - (1/60 + 1/75) = - 1/100.[-ve sign means emptying] The third pipe alone can empty the cistern in 100 min.

Q: Which of the following chemical compounds has the highest boiling point? 1607 0

  • 1
    Dimethyl ether (CH3OCH3)
    Correct
    Wrong
  • 2
    Methanol (CH3OH)
    Correct
    Wrong
  • 3
    Methane (CH4)
    Correct
    Wrong
  • 4
    None
    Correct
    Wrong
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Answer : 2. "Methanol (CH3OH)"
Explanation :

Answer: B) Methanol (CH3OH) Explanation: Chemical Compounds with stronger intermolecular forces have higher boiling points.   The order of strengths of intermolecular forces is:  London dispersion < dipole-dipole < H-bonding   Methane (CH4) — London dispersion forces Dimethyl ether (CH3OCH3) — dipole-dipole attractions Methanol (CH3OH) — hydrogen bonding Therefore, Methanol - CH3OH with H-Bonding have highest Boiling Point among the given chemical compounds.

Q: Light Year is related to 1607 0

  • 1
    Distance
    Correct
    Wrong
  • 2
    Acceleration
    Correct
    Wrong
  • 3
    Velocity
    Correct
    Wrong
  • 4
    Intensity of Light
    Correct
    Wrong
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Answer : 1. "Distance"
Explanation :

Answer: A) Distance Explanation: Light Year is related to Distance. It is the unit of Distance. It is about 9.5 Trillion Kms or 5.9 Trillion miles.   It is the distance that light travels in vaccum in one julian year i.e, 365.25 days.

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