WBCS.LIVE practice question

A glass bulb is balanced by a brass weight on a sensitive beam balance. Now the balance is covered by a bell-jar which is then evacuated :

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. The beam will continue to remain horizontal
  2. The pan containing the bulb will go up
  3. The pan containing the bulb will go up or down depending on degree of vaccum produced
  4. The pan containing the bulb will go down

Correct answer and explanation

Correct answer: The pan containing the bulb will go down