IIT JEE Practice Question and Answer

Q: A cowboy arrives in town on Friday. He stays for 3 days and then leaves on Friday. How is that possible? 920 0

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Answer :
Explanation :

You will get the answer in the riddle itself, if you read the riddle carefully. The riddle says "A cowboy arrives in town on Friday." So Friday is the name of the horse on which he comes. Hence, the only possibility is he arrives on the horse friday on Tuesday, stays for 3 days and leaves on the same horse on Friday.

Q: Which Temple has been awarded the ‘most visited place of the world’ by 'World Book of Records' (WBR)? 918 0

  • 1
    Vaishnodevi temple
    Correct
    Wrong
  • 2
    Golden Temple
    Correct
    Wrong
  • 3
    Meenakshi Temple
    Correct
    Wrong
  • 4
    Rawli Maharaj Temple
    Correct
    Wrong
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Answer : 2. "Golden Temple"
Explanation :

Answer: B) Golden Temple Explanation: WBR that is World Book of Records, the London based organization that focuses on maintaining and cataloging the world records has awarded the title of 'Most visited place in the World' to the famous Golden Temple. This holy Shrine has recorded quite an uplift after the successful Heritage street project carried out by the Amritsar department.  Sri Harmandir Sahib, also known as Golden Temple and the Darbar Sahib, is the holiest Gurdwara and the most important pilgrimage site of Sikhism. It is located in the city of Amritsar, Punjab, India.

Q: Work done in a free expansion process is 917 0

  • 1
    Minimun
    Correct
    Wrong
  • 2
    0
    Correct
    Wrong
  • 3
    Maximum
    Correct
    Wrong
  • 4
    None of the above
    Correct
    Wrong
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Answer : 2. "0"
Explanation :

Answer: B) 0 Explanation: No work done as there is no external external pressure in free expansion.    Hence, Work done in a free expansion process is Zero.

Q: Crack the code? 916 0

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Answer :
Explanation :

STARTLING is a required 9 letter English word is still a word each time you remove a letter from the word. And how it is shown below:    1. Remove the L, and the word becomes: STARTING 2. Remove one T, and the word becomes: STARING 3. Remove the A, and the word becomes: STRING 4. Remove the R, and the word becomes: STING 5. Remove the other T, and the word becomes: SING 6. Remove the G, and the word becomes: SIN 7. Remove the S, and the word becomes: IN 8. Remove the N, and the word becomes: I

Q: Oxidation Number of 'S' in H2SO4? 916 0

  • 1
    +6
    Correct
    Wrong
  • 2
    +2
    Correct
    Wrong
  • 3
    -6
    Correct
    Wrong
  • 4
    -2
    Correct
    Wrong
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Answer : 1. "+6"
Explanation :

Answer: A) +6 Explanation: In H2SO4, Hydrogen has a charge of +2, with each hydrogen has +1. Oxygen has  a charge of -8, with each oxugen has -2. Total charge = (2 - 8) = -6 Therefore, the Oxidation number of Sulphur S is '+6' because to make the compound stable.

Q: How many laws of physics are there? 915 0

  • 1
    5
    Correct
    Wrong
  • 2
    4
    Correct
    Wrong
  • 3
    3
    Correct
    Wrong
  • 4
    2
    Correct
    Wrong
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Answer : 3. "3"
Explanation :

Answer: C) 3 Explanation: Physics has 5 laws. But the 3 laws of Newton has been clubbed together under one Law. Therefore there are 3 Newtons laws of Physics. They are ::   1. Newtons Laws of Motion     a. First Law of Motion     b. Second Law of Motion     C. Third Law of Motion   2. Newtons Law of Cooling   3. Newtons Law of Gravitation.

Q: Uma sold an article for 3400 and got a profit of 25%. If he had sold the article for Rs. 3265. How much profit% would Uma have got ? 914 0

  • 1
    22%
    Correct
    Wrong
  • 2
    27%
    Correct
    Wrong
  • 3
    20%
    Correct
    Wrong
  • 4
    18%
    Correct
    Wrong
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Answer : 3. "20%"
Explanation :

Answer: C) 20% Explanation: Given       125% ---- 3400 => 100% ---- ? => ? = 3400x100/125 = 2720 => Cost price of the article = Rs. 2720 Profit when article sold at Rs. 3265 = 3265 - 2720 = 545 Hence, Profit% = Gain x 100/cost price => P% = 545 x 100/2720 => P% = 20%

Q: Brightness of bulb depends on voltage or current? 914 0

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    Current
    Correct
    Wrong
  • 2
    Voltage
    Correct
    Wrong
  • 3
    Both A & B
    Correct
    Wrong
  • 4
    None
    Correct
    Wrong
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Answer : 3. "Both A & B"
Explanation :

Answer: C) Both A & B Explanation: Brightness of bulb depends on both voltage and current. The brightness depends on power. Since we know that  Power (P) = Voltage x Current = V I So whether you increase the current or the voltage the brightness will increase.   Example Illustration:  If you connect a long bulb and a round bulb in series, the long bulb glows but the round bulb does not. Both of them have the same current flowing through them (they are in series) but the long bulb has a greater voltage across it because it has more resistance (even though V= IR is not obeyed exactly, voltage drop does depend on the resistance). If you connect a round bulb and a long bulb in parallel, however, it is the round bulb that is brighter because now the voltage across both bulbs is the same but the current is larger through the round bulb (smaller resistance).   Hence, the brightness of a bulb depends on power i.e, both voltage and current.

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