Properties Of Matter Ques 21
- A person in a lift is holding a water jar, which has a small hole at the lower end of its side. When the lift is at rest, the water jet coming out of the hole hits the floor of the lift at a distance $d$ of $1.2 \mathrm{~m}$ from the person. In the following, state of the lift’s motion is given in List I and the distance where the water jet hits the floor of the lift is given in List II. Match the statements from List I with those in List II and select the correct answer using the code given below the lists.
(2014 Adv.)
| List I | List II | ||
|---|---|---|---|
| $\mathrm{A}$ | Lift is accelerating vertically up. | $\mathrm{p}$ | $d=1.2 \mathrm{~m}$ |
| Lift is accelerating vertically down with an acceleration less than the gravitational acceleration. |
$\mathrm{q}$ | $d>1.2 \mathrm{~m}$ | |
| $\mathrm{C}$ | Lift is moving vertically up with constant speed. |
$\mathrm{r}$ | $d<1.2 \mathrm{~m}$ |
| $\mathrm{D}$ | Lift is falling freely. | $\mathrm{s}$ | No water leaks out of the jar |
Codes
(a) A-q, B-r, C-q, D-s
(b) A-q, B-r, C-p, D-s
(c) A-p, B-p, C-p, D-s
(d) A-q, B-r, C-p, D-p
Show Answer
Answer:
Correct Answer: 21.( c )
Solution:
This is independent of the value of $g$.
(A) $g_{\mathrm{eff}}>g \quad d=\sqrt{4 h_1 h_2}=1.2 \mathrm{~m}$
(B) $g_{\mathrm{eff}}<g \quad d=\sqrt{4 h_1 h_2}=1.2 \mathrm{~m}$
(C) $g_{\mathrm{eff}}=g \quad d=\sqrt{4 h_1 h_2}=1.2 \mathrm{~m}$
(D) $g_{\text {eff }}=0$
No water leaks out of jar. As there will be no pressure difference between top of the container and any other point.
$ p_1=p_2=p_3=p_0 $
BETA
