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

A sample of radioactive element contains $$8 \times 10^{16}$$ active nuclei. The halt-life of the element is 15 days. The number of nuclei decayed after 60 days is

A
$$7.5 \times 10^{16}$$
B
$$2.0 \times 10^{16}$$
C
$$0.5 \times 10^{16}$$
D
$$4.0 \times 10^{16}$$
2
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

In Young's double slit experiment, with a source of light having wavelength $$6300 \mathop A\limits^o$$, the first maxima will occur when the

A
path difference is $$9200 \mathop A\limits^o$$
B
phase difference is $$\mathrm{n}$$ radian
C
phase difference is $$\frac{\pi}{2}$$ radian.
D
path difference is $$6300 \mathop A\limits^o$$
3
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
4
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
$$\frac{h \rho}{(\delta-\rho)}$$
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