Question

A spring balance A shows a reading of 2 kg, when an aluminium block is suspended from it. Another balance B shows a reading of 5 kg, when a beaker full of liquid is placed in its pan. The two balances are arranged such that the Al – block is completely immersed inside the liquid as shown in the figure. Then

• A. The reading of the balance A will be more than 2 kg
• B. The reading of the balance B will be less than 5 kg
• C. The reading of the balance A will be less than 2 kg. and that of B will be more than 5 kg
• D. The reading of balance A will be 2 kg. and that of B will be 5 kg.

Answer 1

The correct option is C

The reading of the balance A will be less than 2 kg. and that of B will be more than 5 kg

Due to buoyant force on the aluminium block the reading of spring balance A will be less than 2 kg but it increase the reading of balance B.