logo

CuriousTab

CuriousTab

Discussion


Home General Knowledge Physics See What Others Are Saying!
  • Question
  • A boat loaded with rocks floats in the middle of a swimming pool. A man in the boat throws the rocks overboard. The level of water in the pool will


  • Options
  • A. increase
  • B. decrease
  • C. remains the same
  • D. first decrease and then increase

  • Correct Answer
  • decrease 

    Explanation

    Let M and m grams be the mass of boat + rock in it. By law of floatation(M+m) grams of water will be displaced. This has a volume of (M+m)cc. That means the level of water in pool has risen up by (M+m)cc with the boat + rock when it is floating. If the rocks in the boat are thrown not into the pool but outside, the weight left is only M grams the weight of the boat. This will have displaced M cc of water only i.e less water than in the case of loaded boat. But if the rocks are put in the water in the pool and not outside, then the water in the pool will rise not only by M cc on account of empty boat but also by a volume of the stone put into it. This volume will be  m d where m is the mass of rock and d density of rock.

    Now  m d  is  < m. Thus the total rise will be  M + m d which is < M + m.

  • Tags: AIEEE, CAT, Analyst

    More questions

    • 1. When was the first elevator built?

    • Options
    • A. 1743
    • B. 1739
    • C. 1760
    • D. 1785
    • Discuss
    • 2. The hardest form of carbon is

    • Options
    • A. coke
    • B. graphite
    • C. diamond
    • D. charcoal
    • Discuss
    • 3. The mica belt of the Himalayas, the major part of it is situated in

    • Options
    • A. Andhra Pradesh
    • B. Bihar
    • C. Rajasthan
    • D. West Bengal
    • Discuss
    • 4. The first 'Financial Service Park' for industry being set up at

    • Options
    • A. Guragaon
    • B. Surat
    • C. Bangalore
    • D. Pune
    • Discuss
    • 5. http://www.CuriousTab.com - is an example of what?

    • Options
    • A. A URL
    • B. An access code
    • C. A directory
    • D. A server
    • Discuss
    • 6. First human heart transplant operation conducted by Dr. Christiaan Barnard on Louis Washkansky, was conducted in

    • Options
    • A. 1967
    • B. 1968
    • C. 1958
    • D. 1922
    • Discuss
    • 7. The working language(s) of the UNESCO is/are

    • Options
    • A. French only
    • B. English only
    • C. English and French
    • D. English, French and Russian
    • Discuss
    • 8. Ralph Samuelson was only 18 when he invented this sporting item in 1922. What was that?

    • Options
    • A. Golf tee
    • B. Motorboat
    • C. Water skis
    • D. Hang glider
    • Discuss
    • 9. Rahul Dravid also made Test debut along with Sourav Ganguly in the same match.He scored 95 runs. How many fours did he hit in that innings of 95 runs?

    • Options
    • A. 6
    • B. 10
    • C. 5
    • D. 7
    • Discuss
    • 10. The smallest glaciers are

    • Options
    • A. mountain or alpine glaciers
    • B. continental glaciers
    • C. piedmont glaciers
    • D. None of the above
    • Discuss


    Comments

    There are no comments.

Enter a new Comment