IIT JEE Practice Question and Answer

Q: A six-digit number is formed by repeating a three-digit number; for example, 404404 or 415415 etc. Any number of this form is always exactly divisible by 1586 0

  • 1
    101
    Correct
    Wrong
  • 2
    901
    Correct
    Wrong
  • 3
    1001
    Correct
    Wrong
  • 4
    789
    Correct
    Wrong
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Answer : 3. "1001"
Explanation :

Answer: C) 1001 Explanation: Here by trial and error method, we can obseve that 404404 = 404 x 1001; 415415 = 415 x 1001, etc. So, any number of this form is divisible by 1001.

Q: Which colony was farthest north? 1586 0

  • 1
    Massachusetts
    Correct
    Wrong
  • 2
    Virginia
    Correct
    Wrong
  • 3
    Georgia
    Correct
    Wrong
  • 4
    New Hampshire
    Correct
    Wrong
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Answer : 1. "Massachusetts"
Explanation :

Answer: A) Massachusetts Explanation: There are 13 colonies and are ruled by England.   The farthest north colony - Massachusetts The farthest south colony - Georgia The oldest colony - Virginia The colony between the 2 parts of Massachusetts - New Hampshire

Q: A jeep travels a certain distance taking 6 hrs in forward journey, during the return journey increased speed 12km/hr takes the times 4 hrs. What is the distance travelled by the jeep is ? 1585 0

  • 1
    244 km
    Correct
    Wrong
  • 2
    144 km
    Correct
    Wrong
  • 3
    444 km
    Correct
    Wrong
  • 4
    344 km
    Correct
    Wrong
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Answer : 2. "144 km"
Explanation :

Answer: B) 144 km Explanation: Given a jeep travels a certain distance taking 6 hrs in forward journeyDuring the return journey, it takes 4 hrs with an increased speed 12 km/hrLet 'x' be the distance.Now, speed is given by distance/time.Here the difference between both speeds = 12  x4 - x6 = 12  3x - 2x12 = 12   => x = 144 km   Therefore, the distance travelled by the jeep in forward or return journey is x = 144 km.

Q: How does molecular shape affect polarity? 1585 0

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Answer :
Explanation :

Polarity ::  The polarity of a molecule defines its other physical properties such as melting point, boiling point, surface tension, vapor pressure etc... Simply, polarity occurs when the electron distribution in a molecule is asymmetric. This results in a net dipole moment in the molecule. One end of the molecule is charged negative while the other gets a positive charge.   The polarization of a molecule greatly depends on the shape of the molecule. A diatomic molecule like HF mentioned above has no issue of shape. The net dipole moment is only due to the uneven distribution of electrons between the two atoms. However, when there are more than two atoms involved in making a bond, there are many complexities.   The water molecule is of bent shape. Therefore, when the two pair of electrons shared by oxygen with two hydrogen atoms is pulled towards oxygen, the net dipole moment results in the direction of the oxygen atom. There is no other force to cancel out the resultant dipole moment. Hence, the water molecule is highly polar.   Ammonia molecule is of a pyramid shape and the electronegative N atom pulls the electrons towards itself. The three N-H bonds are not in the same plane; hence the dipole moments created do not get canceled out. This makes ammonia a polar molecule.   However, the dipole moments sometimes get canceled due to the shape of the molecules, making the molecule non-polar. Carbon dioxide is such a molecule.

Q: What is the Capital city of Peru? 1583 0

  • 1
    Sucre
    Correct
    Wrong
  • 2
    Manama
    Correct
    Wrong
  • 3
    Lima
    Correct
    Wrong
  • 4
    Bogota
    Correct
    Wrong
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Answer : 3. "Lima"
Explanation :

Answer: C) Lima Explanation: Lima is the Capital of Peru and its Currency is Sol.

Q: What is common between Aerobic and Anaerobic Respiration? 1583 0

  • 1
    Krebs cycle
    Correct
    Wrong
  • 2
    Glycolysis
    Correct
    Wrong
  • 3
    Electron transport chain
    Correct
    Wrong
  • 4
    All the above
    Correct
    Wrong
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Answer : 2. "Glycolysis"
Explanation :

Answer: B) Glycolysis Explanation: Glycolysis is common between Aerobic and Anaerobic Respiration.   Cellular respiration is the process by which glucose is broken down to form ATP molecules, which act as carriers of cellular energy. The first phase is called glycolysis and is common to both aerobic (respiration in the presence of oxygen) and anaerobic (respiration in the absence of oxygen) respiration.   During glycolysis, glucose is split to forms two pyruvate molecules and 2 molecules of ATP. This occurs in the cytoplasm of the cell.   If oxygen in present, the pyruvate molecules will be used in the Krebs cycle, to yield more ATP molecules. If oxygen is absent, the pyruvate is converted into lactic acid, or ethanol and carbon dioxide, in animals or plants, respectively.

Q: Which of the following polysaccharides contains a modified monosaccharide? 1583 0

  • 1
    starch
    Correct
    Wrong
  • 2
    chitin
    Correct
    Wrong
  • 3
    glycogen
    Correct
    Wrong
  • 4
    cellulose
    Correct
    Wrong
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Answer : 2. "chitin"
Explanation :

Answer: B) chitin Explanation: Many carbohydrates contain one or more modified monosaccharide units that have had one or more groups replaced or removed.   Chitin is one of many naturally occurring polymers. It is one of the most abundant natural materials in the world. Over time it is bio-degradable in the natural environment. Its breakdown may be catalyzed by enzymes called chitinases, secreted by microorganisms such as bacteria and fungi, and produced by some plants.   Chitin is composed of repeating units of N-acetylglucosamine, a nitrogen-containing form of glucose.

Q: Which ocean surrounds Antarctica? 1583 0

  • 1
    Atlantic ocean
    Correct
    Wrong
  • 2
    Indian ocean
    Correct
    Wrong
  • 3
    Pacific ocean
    Correct
    Wrong
  • 4
    Southen ocean
    Correct
    Wrong
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Answer : 4. "Southen ocean"
Explanation :

Answer: D) Southen ocean Explanation: Antarctica is surrounded on all sides by water. The Indian, Pacific and Atlantic Oceans surround it on all sides. These three Oceans all meet at Antarctica. The three oceans are collectively called the Southern Ocean. This is the area located south of 50° latitude.

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