1
MHT CET 2021 23th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

Work done in increasing the size of a soap bubble from radius of $$3 \mathrm{~cm}$$ to $$5 \mathrm{~cm}$$ in millijoule is nearly (surface tension of soap solution $$=0.03 \mathrm{~Nm}^{-1}$$)

A
$$0.4 \pi$$
B
$$0.2 \pi$$
C
$$4 \pi$$
D
$$2 \pi$$
2
MHT CET 2021 22th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A ball rises to the surface of a liquid with constant velocity. The density of the liquid is four times the density of the material of the ball. The viscous force of the liquid on the rising ball is greater than the weight of the ball by a factor of

A
4
B
3
C
2
D
5
3
MHT CET 2021 22th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

If the terminal speed of a sphere A [density $$\rho_{\mathrm{A}}=7.5 \mathrm{~kg} \mathrm{~m}^{-3}$$ ] is $$0.4 \mathrm{~ms}^{-1}$$, in a viscous liquid [density $$\rho_{\mathrm{L}}=1.5 \mathrm{~kg} \mathrm{~m}^{-3}$$ ], the terminal speed of sphere B [density $$\rho_B=3 \mathrm{~kg} \mathrm{~m}^{-3}$$ ] of the same size in the same liquid is

A
$$0.3 \mathrm{~ms}^{-1}$$
B
$$0.1 \mathrm{~ms}^{-1}$$
C
$$0.2 \mathrm{~ms}^{-1}$$
D
$$0.4 \mathrm{~ms}^{-1}$$
4
MHT CET 2021 22th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A needle is $$7 \mathrm{~cm}$$ long. Assuming that the needle is not wetted by water, what is the weight of the needle, so that it floats on water?

$$\left[\mathrm{T}=\right.$$ surface tension of water $$\left.=70 \frac{\mathrm{dyne}}{\mathrm{cm}}\right]$$

[acceleration due to gravity $$=980 \mathrm{~cm} \mathrm{~s}^{-2}$$]

A
1 g wt
B
5 g wt
C
3 g wt
D
7 g wt
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