Capacity of a parallel plate capacitor in the absence of dielectric medium is $C_0$. A sheet of dielectric constant $k$ and thickness of one-fourth of the plate separation is inserted between the plates. If the new capacity is $C$, then $\frac{C}{C_0}$ is
$\frac{3 k+1}{2 k}$
$\frac{3 k+1}{4 k}$
$\frac{2 k}{3 k+1}$
$\frac{4 k}{3 k+1}$
Which of the following statement is correct regarding the AC circuit shown in the adjacent figure?

The rms value of current through the circuit is $i_{\text {rms }}=5 \sqrt{2} \mathrm{~A}$
The phase difference between source emf and current is $\phi=\cos ^{-1}\left(\frac{1}{3}\right)$
Average power dissipated in the circuit is 500 W
None of the above
The height $y$ and the distance $x$ along the horizontal plane of a projectile on a certain planet (with no surrounding atmosphere) are given by $y=8 t-5 t^2 \mathrm{~m}$ and $x=6 t \mathrm{~m}$, where $t$ is in seconds. The velocity with which the projectile is projected is
$6 \mathrm{~ms}^{-1}$
$8 \mathrm{~ms}^{-1}$
$10 \mathrm{~ms}^{-1}$
$14 \mathrm{~ms}^{-1}$
A ball is projected horizontally with a velocity of $5 \mathrm{~ms}^{-1}$ from the top of a building 19.6 m high. How long will the ball take to hit the ground?
$\sqrt{2} \mathrm{~s}$
2 s
$\sqrt{3} \mathrm{~s}$
3 s
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