List of top Physics Questions

The potentials of the two plates of capacitors are $+10\, V$ and $-10\, V$. The charge on one of the plates is $40\, C$. The capacitance of the capacitor is
Two insulating plates are both uniformly charged in such a way that the potential difference between them is $V_2 - V_1 = 20\, V.$ (i.e., plate 2 is at a higher potential). The plates are separated by $d = 0.1\, m$ and can be treated as infinitely large. An electron is released from rest on the inner surface of plate 1. What is its speed when it hits plate 2 ? $\left(e=1.6\times10^{-19}C, m_{e}=9.11\times10^{-31}\,kg\right)$
Five capacitors, each of capacitance value $C$ are connected as shown in the figure. The ratio of capacitance between $P$ and $R$, and the capacitance between $P$ and $Q$, is :
A bar magnet has a coercively $ 4\times {{10}^{3}}A{{m}^{-1}} $ . It is desired to demagnetize it by inserting it inside a solenoid $12\, cm$ long and having $60$ turns. The current carried by the solenoid should be:
The angular velocity of second hand, of a clock is :
A heavy stone hanging from a massless string of length $15\, m$ is projected horizontally with speed $147\, m/ s$. The speed of the particle at the point where the tension in the string equals the weight of the particle is?
A ball is projected upwards from a height h above the surface of the earth with velocity v. The time at which the ball strikes the ground is
The skip zone in radio wave transmission is that range where
Which of the following is true for rays coming from infinity?
Which is true for rolling friction $\left(\mu_{r}\right)$, static friction $\left(\mu_{s}\right)$ and kinetic friction $\left(\mu_{k}\right)$ :
If a body moves for 2 s with 15 m/s velocity towards east and then moves with 5 m/s velocity for 8 s towards north, then average velocity is :
The width of the diffraction band varies
A beam of light of wavelength $600\, nm$ from a distant source falls on a single slit $1mm$ wide and the resulting diffraction pattern is observed on a screen $2m$ away. The distance between the first dark fringes on either side of the central bright fringe is
A galvanometer has a resistance of 50$\Omega$. If a resistance of 1$\Omega$ is connected across its terminals, the total current flow through the galvanometer is [$I_g$ represents the maximum current that can be passed through the galvanometer]
A network of four capacitors of capacity equal to $C_{1}=C, C_{2}=2 C, C_{3}=3 C$ and $C_{4}=4 C$ are connected to a battery as shown in the figure. The ratio of the charges on $C_{2}$ and $C_{4}$ is.:
From a balloon rising vertically upwards as $ 5\,m/s $ a stone is thrown up at $10 \,m/s$ relative to the balloon. Its velocity with respect to ground after $ 2\,s $ is (assume $ g=10\,m/s^{2} $ )
Two identical springs are connected in series and parallel as shown in the figure. If $ f_{s} $ and $ f_{p} $ are frequency of series and parallel arrangement what is $ \frac{f_{s}}{f_{p}} $ ?
To increase magnifying power of telescope, we should increase:
The work done by the centripetal force F when the body completes one rotation around the circle of radius R is:
The rms value of the electric field of the light coming from the sun is 720 N/C. The average total energy density of the electromagnetic wave is :
The high boiling point of water is due to which reason:
Of the vectors given below, the parallel vectors are, $ A = 6 \hat i + 8 \hat j$ $30mm B = 210 \hat i + 280 \hat k$ $ C = 0.3 \hat i + 0.4 \hat j$ $ D = 3.6 \hat i + 6 \hat j + 4.8 \hat k$
The time of reverberation of a room $A$ is one second. What will be the time (in seconds) of reverberation of a room, having all the dimensions double of those of room $A$ ?
A tuning fork $A$ produces $4$ beats per second with another tuning fork $B$ of frequency $320\, Hz$. On filing one of the prongs of $A, 4$ beats per second are again heard when sounded with the same fork $B$. Then the frequency of the fork $A$ before filing is
Two concentric circular coils of ten turns each are situated in the same plane. Their radii are $20\, cm$ and $40\, cm$ and they carry respectively $0.2\, A$ and $0.3\, A$ currents in opposite direction. The magnetic field in tesla at the centre is