List of top Physics Questions

To verify Ohm's law, a student connects the voltmeter across the battery as, shown in the figure. The measured voltage is plotted as a function of the current, and the following graph is obtained: If $V_0$ is almost zero, identify the correct statement:
The mass and the diameter of a planet are three times the respective values for the Earth. The period of oscillation of a simple pendulum on the Earth is $2s$. The period of oscillation of the same pendulum on the planet would be :
The top of a water tank is open to air and its water level is maintained. It is giving out $0.74\, m^3$ water per minute through a circular opening of $2\, cm$ radius in its wall. The depth of the centre of the opening from the level of water in the tank is close to :
Two metal spheres, one of radius $R$ and the other of radius $2R$ respectively have the same surface charge density $\sigma$. They are brought in contact and separated. What will be the new surface charge densities on them ?
A person travelling in a straight line moves with a constant velocity v1 for certain distance 'x' and with a constant velocity $v_2$ for next equal distance. The average velocity v is given by the relation
The correct Boolean operation represented by the circuit diagram drawn is :
Two small spherical metal balls, having equal masses, are made from materials of densities $\rho_{1}$ and $\rho_{2}\left(\rho_{1} = 8\pi_{2}\right)$ and have radii of 1mm and 2mm, respectively. They are made to fall vertically (from rest) in a viscous medium whose coefficient of viscosity equals $\eta$ and whose density is $0.1 \,\rho_{2}$. The ratio of their terminal velocities would be :
A uniform rod of length $'6L'$ and mass $'8 \,m'$ is pivoted at its centre $'C'$. Two masses $'m'$ and $'2m'$ with speed $2v$, $v$ as shown strikes the rod and stick to the rod. Initially the rod is at rest. Due to impact, if it rotates with angular velocity $'\omega'$ then $'\omega'$ will be
A galvanometer has resistance of $100\, \Omega$ and a current of $10 \,mA$ produces full scale deflection in it. The resistance to be connected in series, to get a voltmeter of range $50$ volt is
If $'C_p'$ and $'C_v'$ are molar specific heats of an ideal gas at constant pressure and volume respectively. If $'\lambda'$ is the ratio of two specific heats and $'R'$ is universal gas constant then $'C_p'$ is equal to
A current loop, having two circular arcs joined by two radial lines is shown in the figure. It carries a current of $10\, A$. The magnetic field at point $O$ will be close to :
When $100 \,g$ of a liquid A at $100^{\circ}C$ is added to $50\, g$ of a liquid $B$ at temperature $75^{\circ}C$, the temperature of the mixture becomes $90^{\circ}C$. The temperature of the mixture, if $100\, g$ of liquid $A$ at $100^{\circ}C$ is added to $50\, g$ of liquid $B$ at $50^{\circ}C$, will be :
The displacement of a particle executing simple harmonic motion is given by $y =A_{0}+ A\, sin\,wt + B\, cos\,wt$ Then the amplitude of its oscillation is given by:
An amplitude modulated signal is plotted below:
Which one of the following best describes the above signal ?
An amplitude modulated signal is given by $V(t) = 10[1 + 0.3 \cos(2.2 \times 10^4)] \sin(5.5 \times 10^5t)$. Here t is in seconds. The sideband frequencies (in kHz) are, [Given $\pi = 22/7$]
Two guns $A$ and $B$ can fire bullets at speeds $1\, km/s$ and $2\, km/s$ respectively. From a point on a horizontal ground, they are fired in all possible directions. The ratio of maximum areas covered by the bullets fired by the two guns, on the ground is :
In a line of sight radio communication, a distance of about $50\, km$ is kept between the transmitting and receiving antennas. If the height of the receiving antenna is $70\,m$, then the minimum height of the transmitting antenna should be : (Radius of the Earth = $6.4 \times 10^6 m$).
Two equal resistance when connected in series to a battery, consume electric power of $60\, W$. If these resistances are now connected in parallel combination to the same battery, the electric power consumed will be :
When $M_1$ gram of ice at $-10^{\circ}C$ (specific heat = $0.5 \; cal \; g^{-1 \circ } C^{-1}$) is added to $M_2$ gram of water at $50^{\circ}C$, finally no ice is left and the water is at $0^{\circ}C$. The value of latent heat of ice, in cal $g^{-1}$ is:
The circuit diagram shown here corresponds to the logic gate,
The value of $\gamma\left(=\frac{C_{p}}{C_{y}}\right)$ , for hydrogen, helium and another ideal diatomic gas $X$ (whose molecules are not rigid but have an additional vibrational mode), are respectively equal to :
A test particle is moving in a circular orbit in the gravitational field produced by a mass density \(\rho(r) = \frac{K}{r^2}\). Identify the correct relation between the radius \(R\) of the particle's orbit and it's period \(T\) :
A magnetic compass needle oscillates $30$ times per minute at a place where the dip is $45^{\circ}$, and $40$ times per minute where the dip is $30^{\circ}$. If $B_1$ and $B_2$ are respectively the total magnetic field due to the earth at the two places, then the ratio $B_1/B_2$ is best given by :
A solid sphere of mass $'M'$ and radius $'a'$ is surrounded by a uniform concentric spherical shell of thickness $2a$ and mass $2M$. The gravitational field at distance $'3a'$ from the centre will be :
A particle having the same charge as of electron moves in a circular path of radius $0.5\, cm$ under the influence of a magnetic field of $0.5\, T$. If an electric field of $100\, V/m$ makes it to move in a straight path, then the mass of the particle is (Given charge of electron = $1.6 \times 10^{-19} C)$