1
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
$$\frac{h \rho}{(\delta-\rho)}$$
2
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
3
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
$$\frac{2 \epsilon_0}{\lambda}$$
4
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

The P.E. 'U' of a moving particle of mass 'm' varies with 'x'-axis as shown in figure. The deBroglie wavelength or the particle in the regions $$0 \leq x \leq 1$$ and $$x > 1$$ are $$\lambda_1$$ and $$\lambda_2$$ respectively. II the total energy of the particle is '$$\mathrm{nE}$$', then the ratio $$\lambda_1 / \lambda_2$$ is

MHT CET 2021 20th September Evening Shift Physics - Atoms and Nuclei Question 29 English

A
$$\sqrt{\frac{n^2}{n-1}}$$
B
$$\sqrt{\frac{n-1}{n}}$$
C
$$\sqrt{\frac{\mathrm{n}}{\mathrm{n}-1}}$$
D
$$\sqrt{\frac{\mathrm{n}(\mathrm{n}-1)}{\mathrm{n}}}$$
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