IIT JEE Practice Question and Answer

Q: The more you take away the larger it becomes. What is that? 1421 0

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Answer :
Explanation :

A Hole. When you are digging a hole the more you take out the soil, the igger the hole becomes.

Q: Ozone hole refers to 1421 0

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    Decrease in the thickness of ozone layer in Stratosphere
    Correct
    Wrong
  • 2
    Increase in thickness of ozone layer
    Correct
    Wrong
  • 3
    Decrease in the ozone layer in Troposphere
    Correct
    Wrong
  • 4
    Hole in the ozone layer
    Correct
    Wrong
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Answer : 1. "Decrease in the thickness of ozone layer in Stratosphere"
Explanation :

Answer: A) Decrease in the thickness of ozone layer in Stratosphere Explanation:

Q: Plants that make their own food are called 1421 0

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    Autotrophs
    Correct
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  • 2
    Hydrophylls
    Correct
    Wrong
  • 3
    Decomposers
    Correct
    Wrong
  • 4
    Heterotrophs
    Correct
    Wrong
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Answer : 1. "Autotrophs"
Explanation :

Answer: A) Autotrophs Explanation: Plants make their own food through the process of photosynthesis. Plants are self-sufficient. Green plants have the ability to prepare their own food and this is the reason why they are called autotrophs.                                          They make their own food through the process of photosynthesis using light energy to make sugars from carbon dioxide (C02) and water (H20). The chlorophyll which is present in the leaves is the main reason for the production of food in the plants and it is the reason for the greenery of the leaves too.

Q: Area of a square and a rectangle are equal. If side of the square is 40 cm and length of the rectangle is 64 cm, what is the perimeter of the rectangle ? 1420 0

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    187 cm
    Correct
    Wrong
  • 2
    178 cm
    Correct
    Wrong
  • 3
    149 cm
    Correct
    Wrong
  • 4
    194 cm
    Correct
    Wrong
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Answer : 2. "178 cm"
Explanation :

Answer: B) 178 cm Explanation: Area of square = 40 x 40 = 1600 sq.cm Given that the areas of Square and Rectangle are equal => Area of rectangle = 1600 Sq.cm We know that, Area of rectangle = L x B Given L = 64 cm Breadth of rectangle = 1600/64 = 25 cm Perimeter of the rectangle = 2(L + B) = 2(64+25) = 178 cm.

Q: Which is an example of Phototropism? 1418 0

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    roots of a plant following water
    Correct
    Wrong
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    plant bending toward the light
    Correct
    Wrong
  • 3
    roots growing into the soil
    Correct
    Wrong
  • 4
    a venus flytrap capturing a fly
    Correct
    Wrong
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Answer : 2. "plant bending toward the light"
Explanation :

Answer: B) plant bending toward the light Explanation: Phototropism is the ability of a photosynthesizing organism, to grow directionally in response to a light source. It is very common in plants, but can also occur in other organisms such as fungi. Example :: Sunflower

Q: Solve the Number Puzzle ? 1416 0

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    20
    Correct
    Wrong
  • 2
    24
    Correct
    Wrong
  • 3
    26
    Correct
    Wrong
  • 4
    30
    Correct
    Wrong
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Answer : 3. "26"
Explanation :

Answer: C) 26 Explanation: Here the puzzle follows the logic that Right side number = sum of the number on the left side and the previous number on the left side => 6 = 4+2 => 10 = 6+4 => ? = 16+10 = 26.

Q: Visible light has a higher frequency than 1416 0

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    Radio waves
    Correct
    Wrong
  • 2
    X rays
    Correct
    Wrong
  • 3
    Ultra violet
    Correct
    Wrong
  • 4
    All the above
    Correct
    Wrong
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Answer : 1. "Radio waves"
Explanation :

Answer: A) Radio waves Explanation: Radio waves have much longer wavelengths and lower frequencies than do visible light waves. In contrast, X-rays have much shorter wavelengths and higher frequencies.  Ultraviolet Light (UV). part of the electromagnetic spectrum that consists of waves with frequencies higher than those of visible light and lower than those of x-rays.

Q: A container contains 120 lit of Diesel. From this container, 12 lit of Diesel was taken out and replaced by kerosene. This process was further repeated for two times. How much diesel is now there in the container ? 1416 0

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    88.01 lit
    Correct
    Wrong
  • 2
    87.48 lit
    Correct
    Wrong
  • 3
    87.51 lit
    Correct
    Wrong
  • 4
    87.62 lit
    Correct
    Wrong
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Answer : 2. "87.48 lit"
Explanation :

Answer: B) 87.48 lit Explanation: For these type of problems, Quantity of Diesel remained = q1-pqn      Here p = 12 , q = 120    => 1201-121203 = 120 x 0.9 x 0.9 x 0.9 = 87.48 lit.

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