IIT JEE Practice Question and Answer
8Q: Which statement describes decomposers? 1925 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: The most healthy edible oil for heart is 1925 05b5cc6b9e4d2b4197774d6da
5b5cc6b9e4d2b4197774d6da- 1Almond Oilfalse
- 2Sesame Oilfalse
- 3Mustard Oilfalse
- 4Olive Oiltrue
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Answer : 4. "Olive Oil"
Explanation :
Answer: D) Olive Oil Explanation:
Q: If J is the interest on K and K is the interest on L, the rate and time is the same on both the cases. What is the relation between J, K and L ? 1924 05b5cc6d5e4d2b4197774e5d4
5b5cc6d5e4d2b4197774e5d4- 1J x J = KLfalse
- 2K x K= JLtrue
- 3L x L = JKfalse
- 4JKL = 1false
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Answer : 2. "K x K= JL"
Explanation :
Answer: B) K x K= JL Explanation: Let the Time be 'N' and Rate be 'R' J = (K x NR)/100 K = (L x NR)/100 J/K = NR/100 K/L = NR/100 J/K = K/L K x K = JL
Q: Ali and Faizer are 27m apart. They both start walking and meet 9 hrs later, if they travel in the same direction and meet after 3 hrs if they walk in opposite dirction, Ali’s speed must most likely be ? 1923 05b5cc715e4d2b4197774f44f
5b5cc715e4d2b4197774f44f- 19 m/hfalse
- 23 m/hfalse
- 36 m/htrue
- 412 m/hfalse
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Answer : 3. "6 m/h"
Explanation :
Answer: C) 6 m/h Explanation: let, speed of Ali=X mph and Faizer=Y mph Now, relative speed when Ali is walking int the same direction with Faizer= (X-Y)mphhence, according to question, 27/(X-Y)=9 ; solving X-Y=3; --- (1) Now relative speed when walking in the opposite direction= (X+Y) mphhence, according to question, 27/(X+y)=3; solving X+Y=9; --- (2) solving 1 and 2 we get X=6 and Y=3, where X is the speed of Ali.
Q: A work which could be finished in 11 days was finished 4 days earlier after 4 more men joined. The number of men employed was ? 1923 05b5cc6e1e4d2b4197774ebb6
5b5cc6e1e4d2b4197774ebb6- 17true
- 28false
- 39false
- 410false
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Answer : 1. "7"
Explanation :
Answer: A) 7 Explanation: As the work is sameM1D1 = M2D2 Here Let the number of men employed was M=> 11M = 7(M+4)=> 11M - 7M = 28=> M = 7
Q: How much does a gallon of water weigh? 1923 05b5cc6b4e4d2b4197774d4cf
5b5cc6b4e4d2b4197774d4cf- 12.741 kgsfalse
- 22.956 kgsfalse
- 33.418 kgsfalse
- 43.785 kgstrue
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Answer : 4. "3.785 kgs"
Explanation :
Answer: D) 3.785 kgs Explanation: 1 Gallon = 3.785 kgs Gallon is a unit of measurement of liquid. We know that 1 gallon = 3.785 liters But we know that, 1 cubic meter = 1000 lit or 1000 kgs => 1 lit = 1 kg Hence, 1 gallon = 3.785 lit = 3.785 kgs.
Q: A shopkeeper sold a mobile phone for Rs. 12000. Had he offered discount of 10% on the selling price, there would be a loss of 4%. What is the cost price of that Mobile phone? 1923 05b5cc6bce4d2b4197774d8a7
5b5cc6bce4d2b4197774d8a7- 1Rs. 12,500false
- 2Rs. 11,250true
- 3Rs. 12,750false
- 4Rs. 11,680false
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Answer : 2. "Rs. 11,250"
Explanation :
Answer: B) Rs. 11,250 Explanation: Given that SP = Rs. 12000 - 10% = Rs. 10,800 Loss% = 4 We know that, C.P = 100/(100 - Loss%) x 100 => 100/100-4 x 10800 => 1080000/96 C.P = Rs. 11,250
Q: There is a clock which shows false timing ie it shows 20 minutes less for each 1 hour. If the clock shows 12 noon now how many minutes will be lost when it shows 2 pm ? 1922 05b5cc728e4d2b4197774f71e
5b5cc728e4d2b4197774f71e- 136 minutesfalse
- 248 minutesfalse
- 335 minutesfalse
- 460 minutestrue
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Answer : 4. "60 minutes"
Explanation :
Answer: D) 60 minutes Explanation: For 1 hour, 20 minutes is slower, then for 06 miuntes - 2 minutes is slower30 minutes - 10 minutesActual time | false time 12 12 01 PM 12:40 PM (20 minutes slower) 02 PM 01:20 PM 03 PM 02:00 PM So, when actual time is 3pm, the false time is 2 pm.So, it loses 60 minutes when it shows 2 pm.