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

The de-Broglie wavelength of a proton $$\left(m=1.67 \times 10^{-27} \mathrm{~kg}\right)$$ acclerated through a potential difference of $$2 \mathrm{~kV}$$ is

A
$$600 \mathop A\limits^o$$
B
$$0.636 \times 10^{-12} \mathrm{~m}$$
C
$$7 \mathop A\limits^o$$
D
$$0.63 \mathrm{~nm}$$
2
VITEEE 2023
MCQ (Single Correct Answer)
+1
-0

The frequency of a sonometer wire is $$100 \mathrm{~Hz}$$ When the weights producing the tensions are completely immersed in water, the frequence becomes $$60 \mathrm{~Hz}$$ and on immersing the weights in a certain liquid, the frequency becomes $$40 \mathrm{~Hz}$$. The specific gravity of the liquid is

A
1.42
B
1.31
C
1.82
D
1.21
3
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
$$\frac{m v^3}{4 \sqrt{2} g}$$
4
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
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