IIT JEE Practice Question and Answer
8Q: Two persons K and L can complete a piece of work in 30 days and 45 days respectively. If they work together, what part of the work will be completed in 3 days ? 1704 05b5cc6d8e4d2b4197774e7aa
5b5cc6d8e4d2b4197774e7aa- 11/6true
- 21/3false
- 32/3false
- 41/18false
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Answer : 1. "1/6"
Explanation :
Answer: A) 1/6 Explanation: K's one day's work = 1/30 L's one day's work = 1/45 (K + L)'s one day's work = 1/30 + 1/45 = 1/18 The part of the work completed in 3 days = 3 (1/18) = 1/6.
Q: A student multiplied a number by 2/5 instead of 5/2. What is the percentage error in evaluation ? 1704 05b5cc6c0e4d2b4197774dae4
5b5cc6c0e4d2b4197774dae4- 152%false
- 264%false
- 384%true
- 477%false
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Answer : 3. "84%"
Explanation :
Answer: C) 84% Explanation: Let the number be 'x' Then, according to the given data, 52x-25x52xx100 = 2125x100 = 84%
Q: What is the function of reverse transcriptase? 1704 05b5cc60de4d2b4197774b5f5
5b5cc60de4d2b4197774b5f5- 1synthesis of RNA from proteinfalse
- 2synthesis of DNA from an RNA templatetrue
- 3synthesis of protein from DNAfalse
- 4synthesis of DNA from proteinfalse
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Answer : 2. "synthesis of DNA from an RNA template"
Explanation :
Answer: B) synthesis of DNA from an RNA template Explanation: A reverse transcriptase (RT) is an enzyme used to generate complementary DNA (cDNA) from an RNA template by a process called Reverse Transcription. In brief its function is that copies all or part of the virus RNA (retroviruses are RNA-only) as DNA which can then be integrated into the DNA of the host organism.
Q: What approximate value will come in place of question mark (?) in the following question ? (49.001)2 = ? 1704 05b5cc6c7e4d2b4197774dec3
5b5cc6c7e4d2b4197774dec3- 12500false
- 22400true
- 32600false
- 42300false
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Answer : 2. "2400"
Explanation :
Answer: B) 2400 Explanation: Given (49.001)2 = ? => =~ 49 x 49 =~ 2401 =~ 2400
Q: If 6 men and 3 boys working together, can do four times as much work per hour as a man and a boy together. Find the ratio of the work done by a man and that of a boy for a given time ? 1703 05b5cc6dae4d2b4197774e8d2
5b5cc6dae4d2b4197774e8d2- 11 : 2true
- 22 : 1false
- 33 : 1false
- 41 : 3false
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Answer : 1. "1 : 2"
Explanation :
Answer: A) 1 : 2 Explanation: 6M + 3B = 4(1M + 1B)6M + 3B = 4M + 4B2M = 1B M/B = 1/2
Q: Thrice the square of a natural number decreased by 4 times the number is equal to 50 more than the number. The number is ? 1702 05b5cc6dfe4d2b4197774eabc
5b5cc6dfe4d2b4197774eabc- 15true
- 24false
- 37false
- 46false
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Answer : 1. "5"
Explanation :
Answer: A) 5 Explanation: Let the number be x. Then, 3x2 - 4x = x + 50 3x2- 5x - 50 = 0 (3x + 10)(x - 5) = 0 x = 5
Q: which is a best way to measure Ground Distance? 1702 05b5cc6b2e4d2b4197774d373
5b5cc6b2e4d2b4197774d373- Show AnswerHide Answer
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Answer :
Explanation :
Pace Count is a way to measure to Ground Distance. Pace Count is nothing but regular single natural step of about 30 inches long.
Q: What is black when you buy it, red when you use it, and gray when you throw it away? 1701 05b5cc636e4d2b4197774ba52
5b5cc636e4d2b4197774ba52- 1Shoefalse
- 2Charcoaltrue
- 3Beltfalse
- 4All the abovefalse
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Answer : 2. "Charcoal"
Explanation :
Answer: B) Charcoal Explanation: It is Charcoal which is black when we buy it or when not being used. It gets red in appearance when put in use means to say when burning. And eventually when it's been consumed by fire or after getting burned out or used up, changes into ashes which look grey in color.