IIT JEE Practice Question and Answer

Q: What process never occurs in interphase? 1282 0

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Answer :
Explanation :

Absence of cell division is the process that never comes in interphase.

Q: abcdefghijklmnopqrstuvwxyz Riddle What sentence contains all abcdefghijklmnopqrstuvwxyz? 1281 0

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Answer :
Explanation :

The Quick Brown Fox Jumped Over The Lazy Dog  is the sentence which contains all 26 alphabets i.e, from a to z.

Q: Which is an example of Phototropism? 1281 0

  • 1
    roots of a plant following water
    Correct
    Wrong
  • 2
    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: Two parallel chords on the same side of the centre of a circle are 5 cm apart. If the chords are 20 and 28 cm long, what is the radius of the circle? 1281 0

  • 1
    14.69 cm
    Correct
    Wrong
  • 2
    15.69 cm
    Correct
    Wrong
  • 3
    18.65 cm
    Correct
    Wrong
  • 4
    16.42 cm
    Correct
    Wrong
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Answer : 2. "15.69 cm"
Explanation :

Answer: B) 15.69 cm Explanation: Draw the two chords as shown in the figure. Let O be the center of the circle. Draw OC perpendicular to both chords. That divides the two chords in half.So CD = 10 and AB = 14. Draw radii OA and OD, both equal to radius r.We are given that BC = 5, the distance between the two chords. LetOB = x. We use the Pythagorean theorem on right triangle ABO AO² = AB² + OB² r² = 14² + x² We use the Pythagorean theorem on right triangle DCO DO² = CD² + OC² We see that OC = OB+BC = x+5, so r² = 10² + (x+5)² So we have a system of two equations: r² = 14² + x² r² = 10² + (x+5)² Since both left sides equal r², set the right sidesequal to each other. 14² + x² = 10² + (x+5)² 196 + x² = 100 + x² + 10x + 25 196 = 125 + 10x 71 = 10x 7.1 = x r² = 14² + x² r² = 196 + (7.1)² r² = 196 + 50.41 r² = 246.41 r = √246.41 r = 15.69745202 cm

Q: Plants are photosynthetic autotrophs. What does this mean? 1279 0

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Answer :
Explanation :

Plants are photosynthetic autotrophs, which means that they are able to produce their own food through the process called photosynthesis.   In photosynthesis, plants use light, water, and carbon dioxide to create glucose, which they convert to cellulose and use to make new cells.   Hence, that is why, Plants are called photosynthetic autotrophs.

Q: Number Challenge Puzzle ? 1279 0

  • 1
    1
    Correct
    Wrong
  • 2
    4
    Correct
    Wrong
  • 3
    5
    Correct
    Wrong
  • 4
    0
    Correct
    Wrong
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Answer : 1. "1"
Explanation :

Answer: A) 1 Explanation: In each row,  Sum of 1st two digit number + last two digit number = Middle two digit number i.e., 1st row 15 + 40 = 55 2nd row 46 + 47 = 93 Similarly, 7x + 16 = 87 => x = 1.

Q: Microbial Type Culture Collection Centre is situated at 1279 0

  • 1
    Chandigarh
    Correct
    Wrong
  • 2
    New Delhi
    Correct
    Wrong
  • 3
    Hyderabad
    Correct
    Wrong
  • 4
    Bangalore
    Correct
    Wrong
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Answer : 1. "Chandigarh"
Explanation :

Answer: A) Chandigarh Explanation:

Q: Which of the following elements has the lowest electronegativity 1278 0

  • 1
    Bromine
    Correct
    Wrong
  • 2
    Fluorine
    Correct
    Wrong
  • 3
    Carbon
    Correct
    Wrong
  • 4
    Lithium
    Correct
    Wrong
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Answer : 4. "Lithium"
Explanation :

Answer: D) Lithium Explanation: Electronegativity is the tendency for an atom to attract electrons. There are general trends on the periodic table which you can use to determine the relative electronegativity for different elements, but otherwise you can also look at their valence shell and effective nuclear charge to determine their relative electronegativity.   Here from the given options, Lithium has least tendency to attract electrons and thus has a lower electronegativity.

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