IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: Which statement describes decomposers? 1925 0

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    Decomposers are insignificant organisms in the ecosystem and can be absent in some ecosystems.
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    Decomposers can produce their own source of energy and can sometimes act as primary producers.
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  • 3
    Decomposers are those organisms that recycle matter in the ecosystem..
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  • 4
    All the above
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उत्तर : 3. "Decomposers are those organisms that recycle matter in the ecosystem.."
व्याख्या :

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.

प्र: The most healthy edible oil for heart is 1925 0

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    Almond Oil
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    Sesame Oil
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    Mustard Oil
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  • 4
    Olive Oil
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उत्तर : 4. "Olive Oil"
व्याख्या :

Answer: D) Olive Oil Explanation:

प्र: 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 0

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    J x J = KL
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    K x K= JL
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    L x L = JK
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  • 4
    JKL = 1
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उत्तर : 2. "K x K= JL"
व्याख्या :

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

प्र: 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 0

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    7
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  • 2
    8
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  • 3
    9
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  • 4
    10
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उत्तर : 1. "7"
व्याख्या :

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

प्र: How much does a gallon of water weigh? 1923 0

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    2.741 kgs
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    2.956 kgs
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    3.418 kgs
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  • 4
    3.785 kgs
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उत्तर : 4. "3.785 kgs"
व्याख्या :

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.

प्र: 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 0

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    9 m/h
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  • 2
    3 m/h
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    6 m/h
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    12 m/h
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उत्तर : 3. "6 m/h"
व्याख्या :

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.

प्र: 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 0

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    Rs. 12,500
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    Rs. 11,250
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    Rs. 12,750
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    Rs. 11,680
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उत्तर : 2. "Rs. 11,250"
व्याख्या :

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

प्र: 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 0

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    36 minutes
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    48 minutes
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    35 minutes
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    60 minutes
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उत्तर : 4. "60 minutes"
व्याख्या :

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.

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