9.2 , surface tension - Gujarat Board (GSEB) STD 11 Science Physics Questions

369

Questions

1

Question groups

5

Question types

01

M.C.Q (1 Marks)

369 Q→

Sample Questions

9.2 , surface tension questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark

A thin flat circular disc of radius $4.5 \mathrm{~cm}$ is placed gently over the surface of water. If surface tension of water is $0.07 \mathrm{~N} \mathrm{~m}^{-1}$, then the excess force required to take it away from the surface is

A
$198 \mathrm{~N}$
B
$1.98 \mathrm{mN}$
C
$99 \mathrm{~N}$
✓
$19.8 \mathrm{mN}$

Answer: D.

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Q 2M.C.Q (1 Marks)1 Mark

The amount of energy required to form a soap bubble of radius $2\,cm$ from a soap solution is nearly $..........\,\times 10^{-4}\,J$: (surface tension of soap solution $=0.03\,N\,m ^{-1}$ )

A
$50.1$
B
$30.16$
C
$5.06$
✓
$3.01$

Answer: D.

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Q 3M.C.Q (1 Marks)1 Mark

If a soap bubble expands, the pressure inside the bubble:

A
increases
B
remains the same
C
is equal to the atmospheric pressure
✓
decreases

Answer: D.

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Q 4M.C.Q (1 Marks)1 Mark

A capillary tube of radius $r$ is immersed in water and water rises in it to a helght $h$. The mass of the water in the capillary is $5\,g.$ Another capillary tube of radlus $2\, r$ is immersed in water. The mass of water that will rise in this tube is $........\;g$