1
MHT CET 2023 11th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

In a radioactive disintegration, the ratio of initial number of atoms to the number of atoms present at time $$t=\frac{1}{2 \lambda}$$ is [$$\lambda=$$ decay constant]

A
$$\frac{1}{\mathrm{e}}$$
B
$$\sqrt{\mathrm{e}}$$
C
e
D
2e
2
MHT CET 2023 11th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

A bullet is fired on a target with velocity '$$\mathrm{V}$$'. Its velocity decreases from '$$\mathrm{V}$$' to '$$\mathrm{V} / 2$$' when it penetrates $$30 \mathrm{~cm}$$ in a target. Through what thickness it will penetrate further in the target before coming to rest?

A
5 cm
B
8 cm
C
10 cm
D
20 cm
3
MHT CET 2023 11th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

In the experiment of diffraction due to a single slit, if the slit width is decreased, the width of the central maximum

A
becomes zero.
B
does not change.
C
increases.
D
decreases.
4
MHT CET 2023 11th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

A cylindrical magnetic rod has length $$5 \mathrm{~cm}$$ and diameter $$1 \mathrm{~cm}$$. It has uniform magnetization $$5.3 \times 10^3 \mathrm{~A} / \mathrm{m}^3$$. Its net magnetic dipole moment is nearly

A
$$1 \times 10^{-2} \mathrm{~J} / \mathrm{T}$$
B
$$0.5 \times 10^{-2} \mathrm{~J} / \mathrm{T}$$
C
$$2.5 \times 10^{-2} \mathrm{~J} / \mathrm{T}$$
D
$$2 \times 10^{-2} \mathrm{~J} / \mathrm{T}$$
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