1
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

What should be the radius of water drop so that excess pressure inside it is 72 Nm$$^{-2}$$ ? (The surface tension of water 7.2 $$\times$$ 10$$^{-2}$$ Nm$$^{-1}$$)

A
1 mm
B
2 mm
C
8 mm
D
4 mm
2
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A body of density $$V$$ is dropped from (at rest) height '$$h$$' into a lake of density '$$\delta$$' $$(\delta > \rho)$$. The maximum depth to which the body sinks before returning to float on the surface is [Neglect all dissipative forces]

A
$$\frac{(\delta-\rho)}{2 h \rho}$$
B
$$\frac{2 h \rho}{(\delta-\rho)}$$
C
$$\frac{h \rho}{2(\delta-\rho)}$$
D
$$\frac{h \rho}{(\delta-\rho)}$$
3
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A parallel plate air capacitor is charged upto 100 V. A plate 2 mm thick is inserted between the plates. Then to maintain the same potential difference, the distance between the plates is increased by 1.6 mm. The dielectric constant of the thick plate is

A
4
B
5
C
2
D
3
4
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A uniformly charged semicircular arc of radius '$$r$$' has linear charge density $$(\lambda)$$, is the electric field at its centre? ( $$\in_0=$$ permittivity of free space)

A
$$\frac{\lambda}{4 \epsilon_0 r}$$
B
$$\frac{2 \pi \epsilon_0}{\lambda}$$
C
$$\frac{\lambda}{4 \epsilon_0}$$
D
$$\frac{2 \epsilon_0}{\lambda}$$
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