IIT JEE Practice Question and Answer
8Q: Which statement describes decomposers? 1695 05b5cc67be4d2b4197774c204
5b5cc67be4d2b4197774c204- 1Decomposers are insignificant organisms in the ecosystem and can be absent in some ecosystems.false
- 2Decomposers can produce their own source of energy and can sometimes act as primary producers.false
- 3Decomposers are those organisms that recycle matter in the ecosystem..true
- 4All the abovefalse
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Answer : 3. "Decomposers are those organisms that recycle matter in the ecosystem.."
Explanation :
Answer: C) Decomposers are those organisms that recycle matter in the ecosystem.. Explanation: Decomposers are organisms that break down dead or decaying organisms, and in doing so, they carry out the natural process of decomposition. The statement "Decomposers are those organisms that recycle matter in the ecosystem" describes decomposers.
Q: Wilhelm I was declared kaiser of Germany in 1299 05b5cc67be4d2b4197774c209
5b5cc67be4d2b4197774c209- 11797false
- 21841false
- 31871true
- 41914false
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Answer : 3. "1871"
Explanation :
Answer: C) 1871 Explanation: In Germany, Kaiser means 'Emperor'. On 18th January, 1871 Wilhelm I was declared as Kaiser of Germany.
Q: When is genetic drift a major factor in evolution? 3783 05b5cc67be4d2b4197774c1fa
5b5cc67be4d2b4197774c1fa- 1When there is male competitionfalse
- 2When there is artificial selectionfalse
- 3When there is no selective pressuretrue
- 4When there is disruptiveselectionfalse
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Answer : 3. "When there is no selective pressure"
Explanation :
Answer: C) When there is no selective pressure Explanation: Genetic drift or allelic drift is the change in the relative frequency in which a gene variant (allele) occurs in a population due to random sampling and chance. When is genetic drift a major factor in evolution is * When there is low gene flow. * When there is no selective pressure. * When there is a bottleneck.
Q: What kind of mathematics do scientists use to analyze data? 1679 05b5cc67be4d2b4197774c1ff
5b5cc67be4d2b4197774c1ff- 1Algebrafalse
- 2Calculusfalse
- 3Geometryfalse
- 4Statisticstrue
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Answer : 4. "Statistics"
Explanation :
Answer: D) Statistics Explanation: Statistics is a branch of mathematics dealing with the collection, analysis, interpretation, presentation, and organization of data. All scientists uses Statistics for analysing data.
Q: Rs. 69 were divided among 115 family members so that each lady gets 50 paise less than each gentleman, and each gentleman received twice the paise as each lady received. Find the number of gentlemen in the family? 2372 05b5cc67be4d2b4197774c1f0
5b5cc67be4d2b4197774c1f0- 123true
- 292false
- 348false
- 452false
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Answer : 1. "23"
Explanation :
Answer: A) 23 Explanation: Total number of female members = 115 Let the number of males = x Number of females = y => x + y = 115 ......(1) According to the given data, x + y(0.50) = 69 ......(2) From (1) & (2), we get 0.5y = 46 => y = 46 x 2 = 92 => x = 115 - 92 = 23 Hence, required number of gentlemen in the family = x = 23.
Q: What was part of the agenda of southern democrats? 2357 05b5cc67be4d2b4197774c1f5
5b5cc67be4d2b4197774c1f5- 1Using fear for political gainfalse
- 2Cutting taxes for landownersfalse
- 3Using violence for political gainfalse
- 4All the abovetrue
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Answer : 4. "All the above"
Explanation :
Answer: D) All the above Explanation: Southern Democrats are members of the U.S. Democratic Party who reside in the South. All the above given were the part of agenda of southern democrats. Using fear and violence for political gain is the part of the agenda of southern democrats most directly affected African American.
Q: Two girls ate dinner together. After that they both ordered iced tea. One girl drank them very fast and had finished five in the time it took the other to drink just one. The girl who drank one died while the other survived. However, all of the drinks that were served turned out to contain poison. How did the girl who drank the most survive? 1689 05b5cc67be4d2b4197774c1ea
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Answer :
Explanation :
The poison was in the ice. When the girl drank the iced tea, the ice was still fully frozen. Gradually, as the ice cubes melted the poison was released into the drink. Hence, the girl who died, drunk the tea after the ice melted. So, she was died.
Q: An alloy contains gold and silver in the ratio 5 : 8 and another alloy contains gold and silver in the ratio 5 : 3. If equal amount of both the alloys are melted together, then the ratio of gold and silver in the resulting alloy is ? 2736 05b5cc67be4d2b4197774c1eb
5b5cc67be4d2b4197774c1eb- 1113/108false
- 2105/103true
- 3108/115false
- 4103/113false
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Answer : 2. "105/103"
Explanation :
Answer: B) 105/103 Explanation: As given equal amounts of alloys are melted, let it be 1 kg. Required ratio of gold and silver = 513 + 58813 + 38 = 105103. Hence, ratio of gold and silver in the resulting alloy = 105/103.