IIT JEE Practice Question and Answer

Q: 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

  • 1
    Rs. 7.46/kg
    Correct
    Wrong
  • 2
    Rs. 8/kg
    Correct
    Wrong
  • 3
    Rs. 8.74/kg
    Correct
    Wrong
  • 4
    Rs. 8.56/kg
    Correct
    Wrong
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Answer : 2. "Rs. 8/kg"
Explanation :

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

Q: Currency exchange rates are based on 1439 0

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Answer :
Explanation :

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.

Q: Which is faster Light or Sound? 1438 1

  • 1
    Light
    Correct
    Wrong
  • 2
    Sound
    Correct
    Wrong
  • 3
    Both are same
    Correct
    Wrong
  • 4
    Can't be determined
    Correct
    Wrong
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Answer : 1. "Light"
Explanation :

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.

Q: 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

  • 1
    Home Minister Rajnath Singh
    Correct
    Wrong
  • 2
    HRD Minister Prakash Javadekar
    Correct
    Wrong
  • 3
    Finance Minister Piyush Goyal
    Correct
    Wrong
  • 4
    Prime Minister Narendra Modi
    Correct
    Wrong
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Answer : 4. "Prime Minister Narendra Modi"
Explanation :

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.

Q: Which country have declared 2020 'Unique Year for Space Sector' ? 1436 0

  • 1
    United Arab Emirates
    Correct
    Wrong
  • 2
    England
    Correct
    Wrong
  • 3
    USA
    Correct
    Wrong
  • 4
    India
    Correct
    Wrong
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Answer : 1. "United Arab Emirates"
Explanation :

Answer: A) United Arab Emirates Explanation:

Q: Electrical Arcing occurs when 1436 0

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Answer :
Explanation :

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.

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

  • 1
    11!/2
    Correct
    Wrong
  • 2
    1024
    Correct
    Wrong
  • 3
    11!
    Correct
    Wrong
  • 4
    2048
    Correct
    Wrong
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Answer : 4. "2048"
Explanation :

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.

Q: Which solution has the highest pH? 1435 0

  • 1
    50.0 mL 0.0500 M calcium hydroxide, Ca(OH)2 (aq)
    Correct
    Wrong
  • 2
    50.0 mL 0.0500 M sodium hydroxide, NaOH (aq)
    Correct
    Wrong
  • 3
    50.0 mL 0.0500 M nitric acid, HNO3 (aq)
    Correct
    Wrong
  • 4
    50.0 mL 0.0500 M nitrous acid, HNO2 (aq)
    Correct
    Wrong
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Answer : 1. "50.0 mL 0.0500 M calcium hydroxide, Ca(OH)2 (aq)"
Explanation :

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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