List of top Physics Questions asked in KEAM

In the circuit given in figure, 1 and 2 are ammeters. Just after key K is pressed to complete the circuit, the reading will be
A ray of light is incident at $60^{\circ}$ on one face of a prism of angle $30^{\circ}$ and the emergent ray makes $30^\circ$ with the incident ray. The refractive index of the prism is
If a closed organ pipe has the same third harmonic frequency as that of an open organ pipe, then their respective lengths are in the ratio
Two waves are given by $y_1 = \cos \, (4t - 2x)$ and $y_2 = sin \, \big(4t - 2x + \frac{\pi}{4} \big).$ The phase difference between the two waves is
A plane square sheet of charge of side $0.5\, m$ has uniform surface charge density. An electron at $1\, cm$ from the centre of the sheet experiences a force of $1.6 \times 10^{-12}\, N$ directed away from the sheet. The total charge on the plane square sheet is $\left(\varepsilon_{0}=8.854 \times 10^{-12} C ^{2} m ^{-2}\, N ^{-1}\right)$
The unit of self-inductance is
Two particles $ A $ and $ B $ are projected with same speed so that the ratio of their maximum heights reached is $ 3:1 $ . If the speed of $ A $ is doubled without altering other parameters, the ratio of the horizontal ranges attained by $ A $ and $ B $ is
Two forces in the ratio 1 : 2 act simultaneously on a particle. The resultant of these forces is three times the first force. The angle between them is
The variation of speed (in m/s) of an object with time (in seconds) is given by the expression $V(t) = V_0 - 5t + 5t^2$
A man of mass 60 kg is standing on a spring balance inside a lift. lf the lift falls freely downwards, then the reading of the spring balance will be
A train of length $L$ move with a constant speed $V_t$. A person at the back of the train fires a bullet at time $t = 0$ towards a target which is at a distance of $D$ (at time $t =0$) from the front of the train (on the same direction of motion). Another person at the front of the train fires another bullet at time $t\, = \,T$ towards the same target. Both bullets reach the target at the same time. Assuming the speed of the bullets, $V_b$, are same, the length of the train is
A system consisting of two masses connected by a massless rod lies along the x-axis. A 0.4 kg mass is at a distance x = 2 m while a 0.6 kg mass is at a distance x = 7 m. The x-coordinate of the center of mass is
The graph between resistivity and temperature, for a limited range of temperatures, is a straight line for a material like
A potentiometer wire of length $10\, m$ and resistance $ 20\,\Omega $ is connected in series with a $15\, V$ battery and an external resistance $ 40\,\Omega $ . A secondary cell of emf in the secondary circuit is balanced by $240 \,cm$ long potentiometer wire. The emf $E$ of the cell is
Two identical thin rings, each of radius $10\,cm$ carrying charges $10\,C$ and $5\,C$ are coaxially placed at a distance $10\,cm$ apart. The work done in moving a charge $q$ from the centre of the first ring to that of the second is
4 cells each of emf2 V and internal resistance of $ 1 O $ are connected in parallel to a load resistor of $ 2 O $ . Then the current through the load resistor is
From an elevated point $P$, a stone is projected vertically upwards. When the stone reaches a distance $h$ below $P$, its velocity is double of its velocity at a height $h$ above $P$. The greatest height attained by the stone from the point of projection $P$ is
The velocity and acceleration of a particle performing simple harmonic motion have a steady phase relationship. The acceleration shows a phase lead over the velocity in radians of
A point dipole with dipole moment, $\vec{p} = p_0 \hat{k}$ , is kept at the origin. An external electric field given by, $\vec{E} = E_0 ( 2\hat{i} - 3\hat{j} + 4\hat{k})$ , is applied on it. Which one of the following statements is true ?
The half-life of thorium X is 3.64 days. After how many days will 0.1 of the mass of a sample of the substance remain undecayed?
A wall has two layers A and B each made of a different materials. Both layers have the same thickness. The thermal conductivity of the material of A is twice that of B. Under thermal equilibrium, the temperature difference across the wall is 36$^{\circ}$C. The temperature difference across layer A is
A galvanometer can be converted into an ammeter by connecting
Three thin wires of equal length are suspended from the top of a roof. The respective ratio of their area of cross section is $1 : 2 : 4$ and Young?s modulii is $4 : 2 : 1$, then the ratio of their weights to be attached at the other ends to obtain same elongation in them is
In a parallel plate capacitor, if the intervening medium of permittivity $\varepsilon$ between the plates is replaced by another medium of permittivity $\frac{\varepsilon}{2} ,$ then its capacitance is
An electric buib rated 220 V, 100 W is connected in series with another bulb rated 220 V, 60 W. If the voltage across the combination is 220 V, the power consumed by the 100 W bulb will be about