IIT JEE प्रश्न और उत्तर का अभ्यास करें

प्र: Mahesh bought 100 kg of rice for Rs. 1040 and sold it at a loss of as much money as he received for 30 kg rice. At what price did he sell the rice? 1439 0

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    Rs. 7.46/kg
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    Rs. 8/kg
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    Rs. 8.74/kg
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    Rs. 8.56/kg
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उत्तर : 2. "Rs. 8/kg"
व्याख्या :

Answer: B) Rs. 8/kg Explanation: Let the selling price of the rice = Rs.P/kg Now, according to the question, 1040 - 100p = 30p => p = 8/kg   Hence, the selling price of the rice = Rs. 8/kg

प्र: Currency exchange rates are based on 1439 0

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उत्तर :
व्याख्या :

The amount of money you’ll get for a given amount of your country’s currency is based on internationally determined exchange rates. Exchange rates can be either fixed or floating. Fixed exchange rates use a standard, such as gold or another precious metal, and each unit of currency corresponds to a fixed quantity of that standard that should (theoretically) exist.

प्र: Which is faster Light or Sound? 1438 1

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    Light
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    Sound
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    Both are same
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    Can't be determined
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उत्तर : 1. "Light"
व्याख्या :

Answer: A) Light Explanation: Light travels Faster than Sound.   Light : 1. Light doesn't require a medium to travel. 2. It travels in the vaccum with the speed of 1,86,000 miles per second.   Sound: 1. Sound rquire a medium. 2. It travels in the Air with the speed of 340 meters per second. 3. It travels Faster in Water than in Air. 4. It travels Faster in Steel than in Water.

प्र: Which country have declared 2020 'Unique Year for Space Sector' ? 1437 0

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    United Arab Emirates
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    England
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    USA
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  • 4
    India
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उत्तर : 1. "United Arab Emirates"
व्याख्या :

Answer: A) United Arab Emirates Explanation:

प्र: Who has launched a survey on the NaMo App, asking people to rate the performance of the government at the Centre and MPs and MLAs in their constituencies recently? 1436 0

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    Home Minister Rajnath Singh
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    HRD Minister Prakash Javadekar
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    Finance Minister Piyush Goyal
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  • 4
    Prime Minister Narendra Modi
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उत्तर : 4. "Prime Minister Narendra Modi"
व्याख्या :

Answer: D) Prime Minister Narendra Modi Explanation: Prime Minister Narendra Modi has launched a survey on the NaMo App, asking people to rate the performance of the government at the Centre and MPs and MLAs in their constituencies. He launched the initiative, to mark the completion of four years of the NDA government, which came to power at the Centre in 2014.

प्र: Electrical Arcing occurs when 1436 0

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उत्तर :
व्याख्या :

An electric arc is a visible plasma discharge between two electrodes that is caused by electrical current ionizing gasses in the air. Electric arcs occur in nature in the form of lightning.

प्र: There are 11 True or False questions. How many ways can these be answered ? 1435 0

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    11!/2
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    1024
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    11!
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    2048
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उत्तर : 4. "2048"
व्याख्या :

Answer: D) 2048 Explanation: Given 11 questions of type True or False   Then, Each of these questions can be answered in 2 ways (True or false)   Therefore, no. of ways of answering 11 questions = 211 = 2048 ways.

प्र: Which solution has the highest pH? 1435 0

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    50.0 mL 0.0500 M calcium hydroxide, Ca(OH)2 (aq)
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    50.0 mL 0.0500 M sodium hydroxide, NaOH (aq)
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    50.0 mL 0.0500 M nitric acid, HNO3 (aq)
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  • 4
    50.0 mL 0.0500 M nitrous acid, HNO2 (aq)
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उत्तर : 1. "50.0 mL 0.0500 M calcium hydroxide, Ca(OH)2 (aq)"
व्याख्या :

Answer: A) 50.0 mL 0.0500 M calcium hydroxide, Ca(OH)2 (aq) Explanation: 50.0 mL 0.0500 M calcium hydroxide, Ca(OH)2 (aq) has the highest pH value. Sodium hydroxide and Calcium hydroxide are strong bases so they completely ionize in solution. Because they ionize at the same rate, and Calcium hydroxide has the higher pH calculated, then Calcium hydroxide, in fact, has the highest pH. Nitric acid is a strong acid, so it completely ionizes in water. Whilst nitrous acid is a weak acid. Therefore, the nitric acid solution has the LOWEST ph.

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