Properties of Matter 2 Question 16
16. The spring balance $A$ reads $2 kg$ with a block $m$ suspended from it. A balance $B$ reads $5 kg$ when a beaker 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 in the beaker as shown in the figure. In this situation
$(1985,2 M)$
(a) the balance $A$ will read more than $2 kg$
(b) the balance $B$ will read more than $5 kg$
(c) the balance $A$ will read less than $2 kg$ and $B$ will read more than $5 kg$
(d) the balances $A$ and $B$ will read $2 kg$ and $5 kg$ respectively
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Answer:
Correct Answer: 16. (b, c)
Solution:
- Liquid will apply an upthrust on $m$. An equal force will be exerted (from Newton’s third law) on the liquid. Hence, $A$ will read less than $2 kg$ and $B$ more than $5 kg$. Therefore, the correct options are (b) and (c).
