IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: If 34 men completed 2/5th of a work in 8 days working 9 hours a day. How many more man should be engaged to finish the rest of the work in 6 days working 9 hours a day ? 3366 0

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    101 men
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    112 men
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  • 3
    102 men
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    गलत
  • 4
    120 men
    सही
    गलत
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उत्तर : 3. "102 men"
व्याख्या :

Answer: C) 102 men Explanation: From the above formula i.e (m1 x t1/w1) = (m2 x t2/w2) so, [(34 x 8 x 9)/(2/5)] = [(M x 6 x 9)/(3/5)] so, M = 136 men   Number of men to be added to finish the work = 136-34 = 102 men.

प्र: The 1911 Chinese revolution ended the rule of the 3361 0

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    Ming dynasty
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  • 2
    Mongolians dynasty
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    Song dynasty
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    गलत
  • 4
    Manchus dynasty
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उत्तर : 4. "Manchus dynasty"
व्याख्या :

Answer: D) Manchus dynasty Explanation: It was the Qing Dynasty, who was a Manchu Dynasty whose rule ended in 1911 Chinese revolution.

प्र: Ram and Raj start a business with investments of Rs. 2500 and Rs. 2250 respectively. After 2 months, Ram takes out Rs.1250 from his capital. After 1 more month, Raj takes out Rs.750 of his capital while Rakesh joins them with a capital of Rs. 3500. At the end of 6 months, they earn a profit of Rs. 2540. Which of the following is the share of each member in the profit ? 3350 0

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    Ram - Rs. 800, Raj - Rs. 900, Rakesh - Rs. 840
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  • 2
    Ram - Rs. 900, Raj - Rs. 800, Rakesh - Rs. 840
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    गलत
  • 3
    Ram - Rs. 840, Raj - Rs. 920, Rakesh - Rs. 840
    सही
    गलत
  • 4
    Ram - Rs. 800, Raj - Rs. 900, Rakesh - Rs. 940
    सही
    गलत
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उत्तर : 1. "Ram - Rs. 800, Raj - Rs. 900, Rakesh - Rs. 840"
व्याख्या :

Answer: A) Ram - Rs. 800, Raj - Rs. 900, Rakesh - Rs. 840 Explanation: Initial investment of Ram = Rs.2500.After 2 months he withdraw Rs.1250 from his capital.Therefore, we have, Ram invested Rs.2500 for 2 months and Rs.(2500-1250=) 1250 for 4 months. Raj invested Rs. 2250 for 3 months and Rs.(2250-750=) 1500 for 3 months. And, Rakesh invested Rs.3500 for 3 months; Their investing ratio:Ram:Raj:Rakesh = (2500x2 + 1250x4):(2250x3 + 1500x3):(3500x3)= (10,000):(11,250):(10,500) = 1000:1125:1050 = 40:45:42 Total profit for 6 months = Rs.2540Therefore, Ram's share = Rs.(2540 x 40/(40+45+42)) = Rs.(2540 x 40/127) = Rs.800Raj's share = Rs.(2540 x 45/127) = Rs.900Rakesh's share = Rs.(2540 x 42/127) = Rs.840

प्र: The difference of two numbers is 14. Their LCM and HCF are 441 and 7. Find the two numbers ? 3342 0

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    63 and 49
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  • 2
    64 and 48
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  • 3
    62 and 46
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    गलत
  • 4
    64 and 49
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उत्तर : 1. "63 and 49"
व्याख्या :

Answer: A) 63 and 49 Explanation: Since their HCFs are 7, numbers are divisible by 7 and are of the form 7x and 7y Difference = 14 => 7x - 7y = 14=> x - y = 2 product of numbers = product of their hcf and lcm=> 7x * 7y = 441 * 7=> x * y = 63 Now, we havex * y = 63 , x - y = 2=> x = 9 , y = 7 The numbers are 7x and 7y=> 63 and 49

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उत्तर : 1. "84 years"
व्याख्या :

Answer: A) 84 years Explanation: Let the age of ruler is x so that of son = x/2 (given)Now according to the given condition (x/6) + (x/12) + (x/7) + 5 + (x/2) + 4 = x=> x = 84

प्र: The food and drug administration sets standards for 3338 0

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    product labeling
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  • 2
    traffic safety
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  • 3
    advertising
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  • 4
    the environment
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उत्तर : 1. "product labeling"
व्याख्या :

Answer: A) product labeling Explanation: The FDA is responsible for protecting and promoting public health through the control and supervision of food safety, tobacco products, dietary supplements, prescription and over-the-counter pharmaceutical drugs (medications), vaccines, biopharmaceuticals, blood transfusions, medical devices, electromagnetic radiation emitting devices (ERED), cosmetics, animal foods & feed and veterinary products.

प्र: A train moving at 2/3 rd of its normal speed reaches its destination 20 minutes late. Find the normal time taken ? 3338 0

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    4/3 hrs
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  • 2
    2/3 hrs
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  • 3
    3/2 hrs
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    गलत
  • 4
    1/4 hrs
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उत्तर : 2. "2/3 hrs"
व्याख्या :

Answer: B) 2/3 hrs Explanation: Let the original speed and time is S and Tthen distance = S x TNow the speed changes to 2/3S and T is T+20As the distance is sameS x T = 2/3Sx(T+20)solving this we get t = 40 minutes =40/60 = 2/3 hour

प्र: In these series, you will be looking at both the letter pattern and the number pattern. Fill the blank in the middle of the series or end of the series.SCD, TEF, UGH, ____, WKL 3337 0

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    UJI
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    VIJ
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    XLM
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    DOP
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उत्तर : 2. "VIJ"
व्याख्या :

Answer: B) VIJ Explanation: First letter series S,T,U,Vsecond and third letter series CD,EF,GH,IJ...so answer = VIJ

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