1
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
2
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
$$\frac{m v^3}{4 \sqrt{2} g}$$
3
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
4
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.
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