IIT JEE Practice Question and Answer

Q: Plants are photosynthetic autotrophs. What does this mean? 1061 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: 12 men complete a work in 9 days. After they have worked for 6 days, 4 more men join them. How many days will they take to complete the remaining work ? 1061 0

  • 1
    2 days
    Correct
    Wrong
  • 2
    2.5 days
    Correct
    Wrong
  • 3
    2.25 days
    Correct
    Wrong
  • 4
    3 days
    Correct
    Wrong
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Answer : 3. "2.25 days"
Explanation :

Answer: C) 2.25 days Explanation: 1 man's 1 day work = 1/108 12 men's 6 day's work = 1/9 x 6 = 2/3 Remaining work = 1 - 2/3 = 1/3 16 men's 1 day work = 1/108 x 16 = 4/274/27 work is done by them in 1 day. 1/3 work is done by them in 27/4 x 1/3 = 9/4 days.

Q: Who won the world’s largest pre-college science competition in the US in the environmental engineering category for his project on biodegradation of pesticides  ? 1061 0

  • 1
    Shanmuga Sundaram
    Correct
    Wrong
  • 2
    Prashant Ranganathan
    Correct
    Wrong
  • 3
    Suresh Kumar
    Correct
    Wrong
  • 4
    Vijay Ragunathan
    Correct
    Wrong
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Answer : 2. "Prashant Ranganathan"
Explanation :

Answer: B) Prashant Ranganathan Explanation: An Indian boy has won the world’s largest pre-college science competition in the US in the environmental engineering category for his project on biodegradation of pesticides. Prashant Ranganathan, a 12th grader from Jamshedpur, alongwith over 20 high school students from various parts of India, participated in the Intel International Science and Engineering Fair.

Q: How long would it take to travel 4 light years? 1061 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: The Teesta River is flowing through which two Indian states ? 1060 0

  • 1
    Haryana & Punjab
    Correct
    Wrong
  • 2
    Sikkim & West Bengal
    Correct
    Wrong
  • 3
    West Bengal & Manipur
    Correct
    Wrong
  • 4
    Assam & Uttarakhand
    Correct
    Wrong
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Answer : 2. "Sikkim & West Bengal"
Explanation :

Answer: B) Sikkim & West Bengal Explanation: The Teesta River is a 309 km long river flowing through the Indian states of West Bengal and Sikkim, before going to Bay of Bengal through Bangladesh.

Q: Which is an example of Phototropism? 1060 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: If x and y are the two digits of the number 653xy such that this number is divisible by 80, then x+y is equal to  ? 1059 0

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

Answer: D) 2 Explanation: Since 653xy is divisible by 5 as well as 2, so y = 0.Now, 653x0 must be divisible by 8.So, 3x0 must be divisible by 8. This happens when x = 2x + y = (2 + 0) = 2.

Q: The area of a square is equal to the area of a rectangle. The length of the rectangle is 5 cm more than a side of the square and its breadth is 3 cm less than the side of the square. What is the perimeter of the rectangle ? 1059 0

  • 1
    15 cm
    Correct
    Wrong
  • 2
    18 cm
    Correct
    Wrong
  • 3
    34 cm
    Correct
    Wrong
  • 4
    26 cm
    Correct
    Wrong
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Answer : 3. "34 cm"
Explanation :

Answer: C) 34 cm Explanation: Let the side of the square be 's' cm   length of rectangle = (s+5) cm   breadth of rectangle = (s-3)cm   (s+5) (s-3) =    s2 - 5s - 3s - 15 = s2    2s = 15   Perimeter of rectangle = 2(L+B) = 2(s+5 + s–3) = 2(2s + 2)   = 2(15 + 2) = 34 cm

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