1
VITEEE 2023
MCQ (Single Correct Answer)
+1
-0

A particle of mass $m$ is projected with a velocity $$v$$ making an angle of $$45^{\circ}$$ with the horizontal. The magnitude of angular momentum of the projectile about the point of projection when the particle is at its maximum height $$h$$ is.

A
$$\frac{\sqrt{3} m v^2}{2 g}$$
B
zero
C
$$\frac{m v^3}{(2 g)^{1 / 2}}$$
D
$$\frac{m v^3}{4 \sqrt{2} g}$$
2
VITEEE 2023
MCQ (Single Correct Answer)
+1
-0

A parallel plate capacitor with air between the plates has a capacitance of $$15 \mathrm{~pF}$$. the separation between the plates is $$d$$. The space between the plates is now filled with two dielectrics constant $$k_1=3$$ and thickness $$d / 3$$ while the other one has dielectric constant $$k_2=6$$ and thickness $$2 d / 3$$. Capacitance of the capacitor is now

A
18 pF
B
90 pF
C
67.5 pF
D
81 pF
3
VITEEE 2023
MCQ (Single Correct Answer)
+1
-0

A constant voltage is applied between the two ends of a uniform metallic wire, Some heat is developed in it. The heat developed is halved if

A
both the length and the radius of the wire are halved
B
both the length and the radius of the wire are doubled.
C
The radius of the wire is doubled
D
The length of the wire is halved.
4
VITEEE 2023
MCQ (Single Correct Answer)
+1
-0

The wavelength of $$k_\alpha$$-line characteristic $$X$$-rays emitted by an element is $$0.32 \mathop A\limits^o$$. The wavelength of the $$k_\beta$$-line emitted by the same element will be

A
0.32 $$\mathop A\limits^o$$
B
0.39 $$\mathop A\limits^o $$
C
0.49 $$\mathop A\limits^o $$
D
0.27 $$\mathop A\limits^o$$
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