IIT JEE प्रश्न और उत्तर का अभ्यास करें

नवीनतमलोकप्रियमूल्यांकनपेज देखें 71 of 416कुल सवाल 3327 जॉइन Examsbook

प्र: A quantity of tea is sold at Rs. 5.75 per kilogram. The total gain by selling the tea at this rate is Rs. 60. Find the quantity of tea being sold if a profit of 15% is made on the deal ? 1483 0

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    72 kgs
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    80 kgs
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    76 kgs
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    84 kgs
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उत्तर : 2. "80 kgs"
व्याख्या :

Answer: B) 80 kgs Explanation: Say total cost price of tea is x.Then total profit at a rate of 15% is = (15x/100)According to question,15x/100 = 60so x = 400C.p of the tea is Rs. 400.so total selling price will be = (400+60) = Rs.460so the quantity of the tea will be = (460/5.75) = 80kg.

प्र: Leakage of which of the following gases caused the Bhopal gas tragedy ? 1640 0

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    Carbon monoxide
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    Methyl isocyanate
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    Nitrous oxide
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    Hydrogen sulphide
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उत्तर : 2. "Methyl isocyanate"
व्याख्या :

Answer: B) Methyl isocyanate Explanation:

प्र: Which one of the following is used to induce artificial rain ? 2540 0

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    Potassium Nitrate
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    Ammonium chloride
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    Calcium carbonate
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    Silver lodide
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उत्तर : 4. "Silver lodide"
व्याख्या :

Answer: D) Silver lodide Explanation:

प्र: " World Water Day " is celebrated on _____ 1477 0

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    23 rd March
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    24 th March
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    22 nd March
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    21 st March
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उत्तर : 3. "22 nd March"
व्याख्या :

Answer: C) 22 nd March Explanation:

प्र: Dhoni ,Raina ,Kohli and Sikhar have all played 5 innings each and each scored 131 runs.The players Score Card is given below : 100,90,85,80,30,25,20,20,15,15,10,10,10,3,3,3,2,1,1,1.  Given hints are:  1. Dhoni & Raina have scored different runs in 4 innings however in one innings they have scored same runs. 2. Shikhar & Kohli have also scored different runs in 3 innings however their indivitual score is same throughout 2 innings(meaning each has scored same run twice in 2 innings).  3. Shikhar's highest score is greater than that of Kohli's highest score. 4. Only Shikhar has scored more than 1 run in each innings. 5. Raina's hiighest score is greater than that of Dhoni's highest score. Questions : 1. Who scored century in one innings ?2. Who scored 35 runs in 2 consecutive innings ?3. Who scored 30 runs in one innings ? 1758 0

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उत्तर :
व्याख्या :

Scores of individuals : Dhoni= 80,30,10,10,1Raina=100,25,3,2,1Kholi=85,20,15,10,1Shikhar=90,20,15,3,3 Above combination satisfies all conditions given in the question. Answer 1) Raina Answer 2) Kohli and Shikhar Answer 3) Dhoni

प्र: Ram sell his goods 25% cheaper than Shyam and 25% dearer than Bram. How much % is Bram's good cheaper than Shyam ? 1851 0

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    60%
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    40%
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    50%
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    30%
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उत्तर : 2. "40%"
व्याख्या :

Answer: B) 40% Explanation: Lets say shyam sells at 100,   Since Ram sells 25% cheaper than Shyam,   Therefor Ram sells at less than 25% of100 or 75 rs.   Ram sells 25% dearer than Bram or 125% of Ram =100% of Bram or   125% of x (say x price of bram )=75rs.or 100% of x =60rs.hence price of bram is 60rs.   now Bram's good is cheaper than Shyam's as (100-60)x100/100% or 40%.   Hence Brams Good is 40% cheaper than that of Shyam's good.

प्र: What is the next number in this series ?  4, 6, 12, 18, 30, 42, 60, ? 1390 0

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    71
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    72
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    73
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    69
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उत्तर : 2. "72"
व्याख्या :

Answer: B) 72 Explanation: With close observation, you will note that each number in the list is in the middle of two prime numbers. Thus: 4 is in the middle of 3 and 5, 6 is in the middle of 5 and 7, 12 is in the middle of 11 and 13, 18 is in the middle of 17 and 19, 30 is in the middle of 29 and 31. 42 is in the middle of 41 and 43, 60 is in the middle of 59 and 61. Therefore, the next number would be the one that is in the middle of the next two prime numbers, which is 72 (which is in the middle of 71 and 73).

प्र: Three friends, P, Q and R started a partnership business investing money in the ratio of 5 : 4 : 2 respectively for a period of 3 years. What is the amount received by P as his share in the total profit ? a. Total amount invested in the business in Rs. 22,000. b. Profit earned at the end of 3 years is 3/8 of the total investment. c. The average amount of profit earned per year is Rs. 2750. 3283 0

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    Only c is sufficient
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    Both a & b are sufficient
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    Both A & B gives result
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    None
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उत्तर : 3. "Both A & B gives result"
व्याख्या :

Answer: C) Both A & B gives result Explanation: a and b give, profit after 3 years = Rs.(3/8 x 22000) = Rs.8250. From c also, profit after 3 years = Rs. (2750 x 3) = Rs. 8250. ∴ P's share = Rs.(8250 x 5/11) = Rs. 3750. Thus, (either C is redundant) or (a and b are redundant).

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