IIT JEE प्रश्न और उत्तर का अभ्यास करें
8प्र: A man covers a distance of 1200 km in 70 days resting 9 hours a day, if he rests 10 hours a day and walks with speed 1½ times of the previous in how many days will he cover 840 km ? 2728 05b5cc745e4d2b4197774fa0e
5b5cc745e4d2b4197774fa0e- 139 daysfalse
- 237 daysfalse
- 335 daystrue
- 433 daysfalse
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उत्तर : 3. "35 days"
व्याख्या :
Answer: C) 35 days Explanation: Distance d = 1200kmlet S be the speed he walks 15 hours a day(i.e 24 - 9)so totally he walks for 70 x 15 = 1050hrs. S = 1200/1050 => 120/105 = 24/21 => 8/7kmph given 1 1/2 of previous speedso 3/2 * 8/7= 24/14 = 12/7 New speed = 12/7kmph Now he rests 10 hrs a day that means he walks 14 hrs a day. time = 840 x 7 /12 => 490 hrs=> 490/14 = 35 days So he will take 35 days to cover 840 km.
प्र: Which Indian state shares the most borders with other states? 2723 05b5cc626e4d2b4197774b850
5b5cc626e4d2b4197774b850- 1Uttarakhandfalse
- 2Rajasthanfalse
- 3Madhya Pradeshfalse
- 4Uttar Pradeshtrue
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उत्तर : 4. "Uttar Pradesh"
व्याख्या :
Answer: D) Uttar Pradesh Explanation: Uttar Pradesh is the Indian state which share the most borders with 9 different states. Neighbouring States of Uttar Pradesh – Uttarakhand and Himachal Pradesh in northwest, Delhi, Haryana and Rajasthan in west, Madhya Pradesh in south, Chhattisgarh in southeast, Bihar and Jharkhand in east.
प्र: Who invented Dynamite? 2723 05b5cc6bbe4d2b4197774d834
5b5cc6bbe4d2b4197774d834- 1Graham Bellfalse
- 2Nikola Teslafalse
- 3Alfred Nobeltrue
- 4Louis Pateurfalse
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उत्तर : 3. "Alfred Nobel"
व्याख्या :
Answer: C) Alfred Nobel Explanation: Alfred Bernhard Nobel was a Swedish chemist, engineer, inventor, businessman, and philanthropist. Known for inventing Dynamite, Nobel also owned Bofors, which he had redirected from its previous role as primarily an iron and steel producer to a major manufacturer of cannon and other armaments.
प्र: What is the ratio of 18 minutes to one hour ? 2722 05b5cc6bfe4d2b4197774da24
5b5cc6bfe4d2b4197774da24- 11/5false
- 23/4false
- 31/7false
- 43/10true
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उत्तर : 4. "3/10"
व्याख्या :
Answer: D) 3/10 Explanation: One hour = 60 min 18/60 = 3/10
प्र: 6 B in an O? 2721 05b5cc669e4d2b4197774bf59
5b5cc669e4d2b4197774bf59- 16 books in an orderfalse
- 26 balls in an overtrue
- 36 bats in an oddfalse
- 4None of the abovefalse
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उत्तर : 2. "6 balls in an over"
व्याख्या :
Answer: B) 6 balls in an over Explanation: 6 b in an o means 6 balls in an over in cricket.
प्र: An employee may claim Rs. 7.00 for each km when he travels by taxi and Rs. 6.00 for each km if he drives his own car. If in one week he claimed Rs. 595 for traveling 90 km. How many kms did he travel by taxi ? 2721 05b5cc736e4d2b4197774f87e
5b5cc736e4d2b4197774f87e- 155 kmstrue
- 235 kmsfalse
- 325 kmsfalse
- 465 kmsfalse
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उत्तर : 1. "55 kms"
व्याख्या :
Answer: A) 55 kms Explanation: Let x and y be the respective km's travelled by man via taxi and by his own car.Given x + y = 90 => x = 90 - yBut according to the question,7x + 6y = 5957(90-y) + 6y = 595=> 630 - 7y + 6y = 595=> y = 630 - 595 = 35=> x = 90 - 35 = 55Therefore, the distance travelled by taxi is 55 kms.
प्र: Li3PO4 compound name? 2721 05b5cc6a9e4d2b4197774cf14
5b5cc6a9e4d2b4197774cf14- 1Lithium perchloratefalse
- 2Lithium phyritefalse
- 3Lithium phosphatetrue
- 4Nonefalse
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उत्तर : 3. "Lithium phosphate"
व्याख्या :
Answer: C) Lithium phosphate Explanation: The given compund Li3PO4 name is Lithium phosphate. Lithium phosphate is a white crystal at room temperature. It is slightly soluble in water. It can be used to produce glass, disk, colorful phosphor powder. It can also be used as a catalyst in some reactions.
प्र: If a number 72k23l is divisible by 88. Then find value of k and l ? 2716 05b5cc745e4d2b4197774fa36
5b5cc745e4d2b4197774fa36- 1k=8 & l=2false
- 2k=7 & l=2true
- 3k=8 & l=3false
- 4k=7 & l=1false
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उत्तर : 2. "k=7 & l=2"
व्याख्या :
Answer: B) k=7 & l=2 Explanation: If a number to be divisile by 88, it should be divisible by both "8" and "11" Check for '8' :For a number to be divisible by "8", the last 3-digit should be divisible by "8"Here 72x23y --> last 3-digit is '23y'So y=2 [ (i.e) 232 is absolutely divisible by "8"] Chech for '11' :For a number to be divisible by "11" , sum of odd digits - sum of even digits should be divisible by "11"(7 + x + 3) - (2 + 2 + y)(7 + x + 3) - (2 + 2 + 2)(10 + x) - 6 should be divisible by "11"for x = 7=> 17 - 6 = 11 [ which is absolutely divisible by "11"] So x = 7 , y= 2.

