IIT JEE Practice Question and Answer
8Q: If 6 years are subtracted from the present age of Arun and the remainder is divided by 18, then the present age of his grandson Gokul is obtained. If Gokul is 2 years younger to Madan whose age is 5 years, then what is the age of Arun ? 2059 05b5cc71be4d2b4197774f53a
5b5cc71be4d2b4197774f53a- 172 yearsfalse
- 254 yearsfalse
- 360 yearstrue
- 447 yearsfalse
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Answer : 3. "60 years"
Explanation :
Answer: C) 60 years Explanation: Let the Present age of arun is xGokul's age = 5-2 = 3x-6/18 = 3x-6 = 54x = 60Arun's present age = 60 years
Q: Manoj and Satya are ranked seventh and eleventh respectively from the top in a class of 31 students. What will be their respective ranks from the bottom in the class ? 2059 05b5cc6f4e4d2b4197774efe1
5b5cc6f4e4d2b4197774efe1- 125th and 21sttrue
- 226th and 22ndfalse
- 320th and 24thfalse
- 424th and 20thfalse
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Answer : 1. "25th and 21st"
Explanation :
Answer: A) 25th and 21st Explanation: Number of students behind Manoj in rank = (31 - 7) = 24. So, Manoj is 25th from the bottom. Number of students behind Satya in rank = (31 - 11) = 20. So, Satya is 21st from the bottom.
Q: Most commonly used bleaching agent is 2059 05b5cc6a2e4d2b4197774cb17
5b5cc6a2e4d2b4197774cb17- 1Chlorinetrue
- 2Alcoholfalse
- 3Carbon dioxidefalse
- 4Sodium Chloridefalse
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Answer : 1. "Chlorine"
Explanation :
Answer: A) Chlorine Explanation: Chlorine is the most commonly used bleaching agent. Bleaching agents are compounds which are used to remove color from substances such as textiles. A bleaching agent is a material that lightens or whitens a substrate through the chemical reaction. The bleaching reactions usually involve oxidative or reductive processes that degrade color systems.
Q: Fuse Wire is Made of? 2058 05b5cc6b4e4d2b4197774d4f7
5b5cc6b4e4d2b4197774d4f7- 1an alloy of Tin and Leadtrue
- 2Nickelfalse
- 3Copperfalse
- 4an alloy of Nickel and Leadfalse
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Answer : 1. "an alloy of Tin and Lead"
Explanation :
Answer: A) an alloy of Tin and Lead Explanation: Fuse Wire is Made of an alloy of Tin and Lead. If too high a current flows, the element rises to a higher temperature and either directly melts, or else melts a soldered joint within the fuse, opening the circuit. Thefuse element is made of an alloy of Tin and Lead to provide stable and predictable characteristics.
Q: Statement : Let there be a signboard also indicating the directions and instructions. Assumptions :a) Signboard can be prepared without using any language.b) Signboard is the only effective tool to indicate directions. 2057 05b5cc72ce4d2b4197774f769
5b5cc72ce4d2b4197774f769- 1Both a and b are not sufficienttrue
- 2Only a is sufficientfalse
- 3Only b is sufficientfalse
- 4Both a and b are sufficientfalse
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Answer : 1. "Both a and b are not sufficient"
Explanation :
Answer: A) Both a and b are not sufficient Explanation: The statement doesn't give any clue to the use of language. Hence a is not implicit. b is also not implicit because in the sentence 'only' indicates false meaning.
Q: What important polymer is located in the nucleus? 2056 05b5cc611e4d2b4197774b650
5b5cc611e4d2b4197774b650- 1Ribosomesfalse
- 2Chromosomesfalse
- 3DNAtrue
- 4Proteinsfalse
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Answer : 3. "DNA"
Explanation :
Answer: C) DNA Explanation: The most important polymer present in the nucleus is DNA- the master molecule. It is a polymer of Nucleotides.
Q: A man whose speed is 4.5 kmph in still water rows to a certain upstream point and back to the starting point in a river which flows at 1.5 kmph, find his average speed for the total journey ? 2056 05b5cc6dce4d2b4197774e997
5b5cc6dce4d2b4197774e997- 15 kmphfalse
- 27 kmphfalse
- 33 kmphfalse
- 44 kmphtrue
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Answer : 4. "4 kmph"
Explanation :
Answer: D) 4 kmph Explanation: Speed of Man = 4.5 kmphSpeed of stream = 1.5 kmphSpeed in DownStream = 6 kmphSpeed in UpStream = 3 kmphAverage Speed = (2 x 6 x 3)/9 = 4 kmph.
Q: Statement: Ministry of Tourism in its one of the reports revealed that due to recent social disturbance in the country, the number of foreign tourists has decreased considerably, which resulted in a financial loss of Rs 100 crore.Courses of action:a. The Government should provide financial support to the tourism sector.b. Foreign tourists should be informed that they visit the country at their risk. 2055 05b5cc764e4d2b4197774fd8f
5b5cc764e4d2b4197774fd8f- 1Only b followsfalse
- 2Only a followsfalse
- 3Both a & b followsfalse
- 4Neither a nor b followstrue
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Answer : 4. "Neither a nor b follows"
Explanation :
Answer: D) Neither a nor b follows Explanation: Financial support to the tourism sector is not a permanent solution. Secondly, constant risk for the foreign tourists will never encourage tourism in India. Hence, none of the course action is the right solution in this direction.