IIT JEE प्रश्न और उत्तर का अभ्यास करें
8प्र: An alloy contains gold and silver in the ratio 5 : 8 and another alloy contains gold and silver in the ratio 5 : 3. If equal amount of both the alloys are melted together, then the ratio of gold and silver in the resulting alloy is ? 2934 05b5cc67be4d2b4197774c1eb
5b5cc67be4d2b4197774c1eb- 1113/108false
- 2105/103true
- 3108/115false
- 4103/113false
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उत्तर : 2. "105/103"
व्याख्या :
Answer: B) 105/103 Explanation: As given equal amounts of alloys are melted, let it be 1 kg. Required ratio of gold and silver = 513 + 58813 + 38 = 105103. Hence, ratio of gold and silver in the resulting alloy = 105/103.
प्र: Which of these is not a function of the kidneys? 2934 05b5cc69de4d2b4197774c8fa
5b5cc69de4d2b4197774c8fa- 1The kidneys regulate the plasma volumefalse
- 2The kidneys help to regulate blood pressurefalse
- 3The kidneys help control the rate of red blood cell productionfalse
- 4The kidneys deactivate vitamin D and stimulate the activity of osteoclaststrue
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उत्तर : 4. "The kidneys deactivate vitamin D and stimulate the activity of osteoclasts"
व्याख्या :
Answer: D) The kidneys deactivate vitamin D and stimulate the activity of osteoclasts Explanation: The kidneys deactivate vitamin D and stimulate the activity of osteoclasts is wrong among the functions of kidneys. The kidneys are two bean-shaped organs in the renal system. They help the body pass waste as urine. They also help filter blood before sending it back to the heart. The kidneys perform many crucial functions, including: maintaining overall fluid balance. regulating and filtering minerals from the blood. filtering waste materials from food, medications, and toxic substances. creating hormones that help produce red blood cells, promote bone health, and regulate blood pressure.
प्र: 5 men and 3 boys can together cultivate a 23 acre field in 4 days and 3 men and 2 boys together can cultivate a 7 acre field in 2 days. How many boys will be needed together with 7 men, if they cultivate 45 acre of field in 6 days. 2932 05b5cc69de4d2b4197774c8ad
5b5cc69de4d2b4197774c8ad- 16false
- 24false
- 32true
- 43false
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उत्तर : 3. "2"
व्याख्या :
Answer: C) 2 Explanation: Let work done by 1 man in i day be m and Let work done by 1 boy in 1 day be b From the given data, 4(5m + 3b) = 23 20m + 12b = 23....(1) 2(3m + 2b) = 7 6m + 4b = 7 ....(2) By solving (1) & (2), we get m = 1, b = 1/4 Let the number of required boys = n 6(7 1 + n x 1/4) = 45 => n = 2.
प्र: After independence, the first state organized on the basis of language age is ? 2929 25b5cc6dfe4d2b4197774eb25
5b5cc6dfe4d2b4197774eb25- 1Karnatakafalse
- 2Punjabfalse
- 3Gujaratfalse
- 4Andhra Pradeshtrue
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उत्तर : 4. "Andhra Pradesh"
व्याख्या :
Answer: D) Andhra Pradesh Explanation:
प्र: A man can row against the current three fourth of a kilometer in 15 min and returns same distance in 10 min, then ratio of his speed to that of current? 2926 05b5cc6a8e4d2b4197774ce95
5b5cc6a8e4d2b4197774ce95- 15:1true
- 23:1false
- 34:1false
- 42:1false
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उत्तर : 1. "5:1"
व्याख्या :
Answer: A) 5:1 Explanation: Let the speed of the man in still water = p kmph Speed of the current = s kmph Now, according to the questions (p + s) x 10 = (p - s) x 15 2p + 2s = 3p - 3s => p : s = 5 : 1 Hence, ratio of his speed to that of current = 5:1.
प्र: At what time will B catch up with A, if A starts from a place at 11.00 A.M. and travels at a speed of 3.5 kmph, B starts at 1.00 P.M. and travels with speeds of 1 kmph for 1 hour, 2 kmph for the next 1 hour, 3 kmph for the next 1 hour and so on. 2925 05b5cc715e4d2b4197774f409
5b5cc715e4d2b4197774f409- 18 : 47 pmfalse
- 26 : 40 pmfalse
- 38 : 42 pmfalse
- 47 : 40 pmtrue
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उत्तर : 4. "7 : 40 pm"
व्याख्या :
Answer: D) 7 : 40 pm Explanation: At 1 pm ... Distance between A and B = 2x3.5 = 7 kmsat 2 pm .....Distance between A and B = 7 + 3.5 - 1 = 9.5 kmsAt 3 pm ....Distance between A and B = 9.5 + 3.5 - 2 = 11 kms.......At 7 pm distance between A and B = 3 kms.From 7 pm to 8 pm, speed of A = 3.5 kmphspeed of B = 8 kmphRelative speed = 4.5 kmph Time taken by B to meet A = 3/4.5 hrs = 30/45 hrs = 120/3 mins = 40 mins. So meeting time is 7 : 40 PM.
प्र: The granting of fundamental rights to citizens aims at ensuring ? 2924 05b5cc6cae4d2b4197774e010
5b5cc6cae4d2b4197774e010- 1Socialistic governmentfalse
- 2Individual libertytrue
- 3An Independent judiciaryfalse
- 4None of the abovefalse
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उत्तर : 2. "Individual liberty"
व्याख्या :
Answer: B) Individual liberty Explanation:
प्र: फुफ्फुस गुहा में वायु को न्यूमोथोरैक्स कहा जाता है। 2924 05b5cc607e4d2b4197774b516
5b5cc607e4d2b4197774b516- 1TRUEtrue
- 2FALSEfalse
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उत्तर : 1. "TRUE"
व्याख्या :
Answer: A) TRUE Explanation: फुफ्फुस स्थान में वायु या गैस का निर्माण हो सकता है और जब ऐसा होता है, तो इसे न्यूमोथोरैक्स कहा जाता है। अतः दिया गया कथन सत्य है।