IIT JEE Practice Question and Answer
8Q: Plants are photosynthetic autotrophs. What does this mean? 1061 05b5cc662e4d2b4197774be95
5b5cc662e4d2b4197774be95- Show Answer
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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 05b5cc6d7e4d2b4197774e700
5b5cc6d7e4d2b4197774e700- 12 daysfalse
- 22.5 daysfalse
- 32.25 daystrue
- 43 daysfalse
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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 05b5cc6dce4d2b4197774e9b0
5b5cc6dce4d2b4197774e9b0- 1Shanmuga Sundaramfalse
- 2Prashant Ranganathantrue
- 3Suresh Kumarfalse
- 4Vijay Ragunathanfalse
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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 05b5cc6ade4d2b4197774d124
5b5cc6ade4d2b4197774d124- Show Answer
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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 05b5cc6cfe4d2b4197774e317
5b5cc6cfe4d2b4197774e317- 1Haryana & Punjabfalse
- 2Sikkim & West Bengaltrue
- 3West Bengal & Manipurfalse
- 4Assam & Uttarakhandfalse
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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 05b5cc6abe4d2b4197774cfd6
5b5cc6abe4d2b4197774cfd6- 1roots of a plant following waterfalse
- 2plant bending toward the lighttrue
- 3roots growing into the soilfalse
- 4a venus flytrap capturing a flyfalse
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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 05b5cc761e4d2b4197774fd62
5b5cc761e4d2b4197774fd62- 15false
- 24false
- 33false
- 42true
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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 05b5cc6c0e4d2b4197774db0f
5b5cc6c0e4d2b4197774db0f- 115 cmfalse
- 218 cmfalse
- 334 cmtrue
- 426 cmfalse
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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