IIT JEE Practice Question and Answer
8Q: A man covered a certain distance at some speed. Had he moved 3 kmph faster, he would have taken 40 minutes less. If he had moved 2 kmph slower, he would have taken 40 minutes more. The distance (in km) is 1657 05b5cc6d9e4d2b4197774e816
5b5cc6d9e4d2b4197774e816- 130false
- 236false
- 340true
- 442false
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Answer : 3. "40"
Explanation :
Answer: C) 40 Explanation: Let distance = x km and usual rate = y kmph.Then, x/y - x/(y+3) = 40/60 --> 2y (y+3) = 9x ----- (i)Also, x/(y-2) - x/y = 40/60 --> y(y-2) = 3x -------- (ii)On dividing (i) by (ii), we get: x = 40 km.
Q: P alone can do a piece of work in 24 days. The time taken by P to complete one-third of work is equal to time taken by Q to complete half of the work. How many days are required to complete by P and Q working together ? 1657 05b5cc6c2e4d2b4197774dbaa
5b5cc6c2e4d2b4197774dbaa- 19 3/5 daystrue
- 27 daysfalse
- 36 3/7 daysfalse
- 48 daysfalse
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Answer : 1. "9 3/5 days"
Explanation :
Answer: A) 9 3/5 days Explanation: Let the total work be 'W' As per the given information, P can complete the work 'W' in 24 days. => one day work of P = W/24 And also given that, The time taken by P to complete one-third of work is equal to time taken by Q to complete half of the work => PW/3 = QW/2 => P's 1 day = W/24 ? = W/3 => ? = 24W/3W = 8 => QW/2 = 8 days => Q alone can complete the work W in 16 days => P + Q can complete the work in 1/24 + 1/16 = 5/48 => 48/5 days = 9 3/5 days.
Q: photosynthesis takes place faster in 1655 05b5cc69ee4d2b4197774c980
5b5cc69ee4d2b4197774c980- 1darknessfalse
- 2red lightfalse
- 3white lighttrue
- 4yellow lightfalse
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Answer : 3. "white light"
Explanation :
Answer: C) white light Explanation: As far as the rate of photosynthesis is concerned, it is fastest in white light making the rate of photosynthesis maximum. After White, We Have Violet Light Where Photosynthesis Occur To A Higher Extent as It Has The Shortest Wavelength Hence Has The Max Energy. So The Order Is :: white>violet>blue.
Q: What is not a reason christian missionaries went to Asia? 1655 05b5cc619e4d2b4197774b745
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Answer :
Explanation :
To obtain exotic spices or to find trade items are not the reasons for christian missionaries went to Asia.
Q: Below question has with a part of it underlined. The question is followed by four alternatives to replace the underlined part of the sentence. Choose the best alternative which is grammatically correct. In this particular job we have discovered that to be diligent is more important than being bright. 1655 05b5cc6d3e4d2b4197774e4aa
5b5cc6d3e4d2b4197774e4aa- 1for one to be diligent is more important than being bright.false
- 2by being diligent is important than being bright.false
- 3being diligent is more important than being bright.false
- 4diligence is more important than brightness.true
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Answer : 4. "diligence is more important than brightness."
Explanation :
Answer: D) diligence is more important than brightness. Explanation: Parallel construction error in the original statement. A similar form is required on each side of the comparison. " Diligence - brightness ".
Q: Find the odd one out of the group ? 1653 05b5cc6e1e4d2b4197774ebca
5b5cc6e1e4d2b4197774ebca- 1708false
- 2392true
- 3618false
- 4816false
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Answer : 2. "392"
Explanation :
Answer: B) 392 Explanation: The sum of the digits in 708, 618 and 816 is 15, but not in 392.
Q: How many blocks in a mile? 1653 05b5cc6a4e4d2b4197774cc7c
5b5cc6a4e4d2b4197774cc7c- 18 - 12false
- 212 - 15false
- 38 - 15false
- 415 - 20true
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Answer : 4. "15 - 20"
Explanation :
Answer: D) 15 - 20 Explanation: About 15 - 20 blocks become a 1 mile. City blocks differ in sizes. They do not have a standard measurement. Every geographical area has its own average city block size. A city block is a rectangular area in a city with several buildings with the streets around. It is also called "block" which, in a dictionary, is defined as an informal unit of distance from one intersection to the next.
Q: A, B and C started a company where their initial investments was in the ratio of 2:3:4. At the end of 6 months, A invested an amount such that his total capital became equal to B's initial capital investment. If the annual profit of B is Rs. 3000 then what is the total profit of the company ? 1653 05b5cc6cce4d2b4197774e138
5b5cc6cce4d2b4197774e138- 1Rs. 9500true
- 2Rs. 10600false
- 3Rs. 7500false
- 4Rs. 8900false
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Answer : 1. "Rs. 9500"
Explanation :
Answer: A) Rs. 9500 Explanation: Given initial investments ratio = 2 : 3 : 4 At the end of 6 months, A invested an amount such that his total capital became equal to B's initial capital investment i.e, upto 6 months A's investment is 2 and after 6 months his invstment is 3 = B's investment Now, Ratio of investment for one year => A : B : C = (2×6 + 3×6) : (3×12) : (4×12) = 30 : 36 : 48 = 5 : 6 : 8 But given B's profit = 3000 => 6 ratio = 3000 For total => 19 ratio = Rs. 9500.