IIT JEE Practice Question and Answer
8Q: What animals eat both producers and consumers? 1577 05b5cc66de4d2b4197774bfc0
5b5cc66de4d2b4197774bfc0- 1Herbivoresfalse
- 2Omnivorestrue
- 3Carnivoresfalse
- 4Tertiary consumersfalse
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Answer : 2. "Omnivores"
Explanation :
Answer: B) Omnivores Explanation: Animals and people who eat both animals and plants i.e, both producers and consumers are called omnivores.
Q: Three numbers which are co-prime to each other are such that the product of the first two is 551 and that of the last two is 1073. The sum of the three numbers is : 1577 05b5cc6eee4d2b4197774ef09
5b5cc6eee4d2b4197774ef09- 183false
- 289false
- 385true
- 479false
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Answer : 3. "85"
Explanation :
Answer: C) 85 Explanation: Since the numbers are co-prime, they contain only 1 as the common factor.Also, the given two products have the middle number in common.So, middle number = H.C.F of 551 and 1073 = 29;First number = 551/29 = 19Third number = 1073/29 = 37.Required sum = 19 + 29 + 37 = 85.
Q: Mohan spends 23% of an amount of money on an insurance policy, 33% on food, 19% on children’s education and 16% on recreation. He deposits the remaining amount of Rs. 504 in bank. How much amount does he spend on food and insurance policy together? 1577 05b5cc678e4d2b4197774c160
5b5cc678e4d2b4197774c160- 1Rs. 2326false
- 2Rs. 5876false
- 3Rs. 1741false
- 4Rs. 3136true
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Answer : 4. "Rs. 3136"
Explanation :
Answer: D) Rs. 3136 Explanation: Let total amount = Rs. P Total expenditure = (23 + 33 + 19 + 16)% of P = 91%ofP Remaining money = (100 - 91)% of P = 9% of P But given in the question that, 9% of P = 504 9p/100 = 504 => P = 50400/9 => P = Rs. 5600 Required money spent on Food & Insurance = 23 + 33 % = 56% of 5600 = 56 x 5600/100 = 56 x 56 = Rs. 3136
Q: What is the gram formula mass of Li2SO4? 1577 05b5cc67be4d2b4197774c1d1
5b5cc67be4d2b4197774c1d1- 1101.2487false
- 2109.9446true
- 3111.2687false
- 4106.5871false
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Answer : 2. "109.9446"
Explanation :
Answer: B) 109.9446 Explanation: The term gram formula mass is synonymous with molecular mass. So, to get this, we must add molar mass of all the elements in this compound. Given compound is Lithium Sulphate - Li2SO4 Elemental calculation :: Li - Lithium - 6.941 - 2 - 13.88200 %S - Sulfur - 32.065 - 1 - 32.065 %O - Oxygen - 15.9994 - 4 - 63.9976 % Now, total = 12.6264 + 29.1647 + 58.2090 = 109.9446 Hence, the gram formula mass of Li2SO4 = 109.9446.
Q: Not including the sun, the closest stars to earth are 1576 05b5cc69fe4d2b4197774ca19
5b5cc69fe4d2b4197774ca19- 14300 light-years awayfalse
- 2430 light-years awayfalse
- 343 light-years awayfalse
- 44.3 light-years awaytrue
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Answer : 4. "4.3 light-years away"
Explanation :
Answer: D) 4.3 light-years away Explanation: The nearest stars to Earth are in the Alpha Centauri triple-star system, about 4.37 light-years away. One of these stars, Proxima Centauri, is slightly closer, at 4.26 light-years. Of all the stars closer than 15 light-years, only two are spectral type G, similar to our sun: Alpha Centauri A and Tau Ceti. The majority are M-type red dwarf stars. Only nine of the stars in this area is bright enough to be seen by the naked human eye from Earth. These brightest stars include Alpha Centauri A and B, Sirius A, Epsilon Eridani, Procyon, 61 Cygni A and B, Epsilon Indi A and Tau Ceti.
Q: Elisa test is employed to diagnose 1576 05b5cc68ee4d2b4197774c3e4
5b5cc68ee4d2b4197774c3e4- 1HIVtrue
- 2Cancerfalse
- 3Tuberculosisfalse
- 4Poliofalse
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Answer : 1. "HIV"
Explanation :
Answer: A) HIV Explanation: ELISA - Enzyme-Linked Immuno Sorbent Assay. An ELISA test may be used to diagnose: HIV, which causes AIDS. An ELISA also called EIA, is a test that detects and measures antibodies in your blood. Antibodies are proteins that your body produces in response to harmful substances called antigens.
Q: Which of the following became widespread during the 1980's? 1576 05b5cc62fe4d2b4197774b97e
5b5cc62fe4d2b4197774b97e- 1Internetfalse
- 2Radiofalse
- 3Cable televisiontrue
- 4All the abovefalse
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Answer : 3. "Cable television"
Explanation :
Answer: C) Cable television Explanation: Cable television or cable TV became widespread during the 1980's.
Q: A can complete 9/10 part of a work in 31 days. After that, with the help of B he can complete the remaining work in 4 days. In how many days will A and B together can complete that work ? 1576 05b5cc6c0e4d2b4197774db14
5b5cc6c0e4d2b4197774db14- 136false
- 240true
- 342false
- 438false
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Answer : 2. "40"
Explanation :
Answer: B) 40 Explanation: Remaining work = 1 - 9/10 = 1/10 => A & B together completes 1/10 of work in 4 days => 1 work can completed in ------ ? days Let it be x days => 4110=x1 => x = 40 days. Hence, A & B together can complete the work in 40 days.

