Question

The spring balance A reads $2\text{kg}$ with a block $m$ suspended from it. Another balance B reads $5\text{kg}$ when a beaker filled with liquid is put on the pan of the balance. The two balances are now so arranged that the hanging mass is inside the liquid as shown in figure. In this situation

• A. The balance A will read more than $2\text{kg}$
• B. The balance B will read less than $5\text{kg}$
• C. The balance A will read less than $2\text{kg}$ and B will read more than $5\text{kg}$
• D. The balances A and B will read $2\text{kg}$ and $5\text{kg}$ respectively

Answer 1

The correct option is C The balance A will read less than $2\text{kg}$ and B will read more than $5\text{kg}$

Force of upthrust will be there on mass $m$ shown in figure, so A weighs less than $2\text{kg}$. Balance will show sum of load of beaker and reaction of upthrust so, it reads more than $5\text{kg}$.