List of top Physics Questions asked in KEAM

Two capillary tubes A and B of diameter $1\, mm$ and $2\, mm$ respectively are dipped vertically in a liquid. If the capillary rise in A is 6 cm, then the capillary rise in B is
The resistivity of the material of a potentiometer wire is $5 \times 10^{-6} \Omega\, m$ and its area of cross section is $5 \times 10^{-6} \; m^2$. If $0.2\, A$ current is flowing through the wire, then the potential drop per metre length of the wire is
Orbital velocity of earth satellite does not depend on
Two discs rotating about their respective axis of rotation with angular speeds $2 \text{ rads}^{-1}$ and $5 \text{ rads}^{-1}$ are brought into contact such that their axes of rotation coincide. Now, the angular speed of the system becomes $4 \text{ rads}^{-1}$. If the moment of inertia of the second disc is $1 \times 10^{-3} \text{ kg m}^2$, then the moment of inertia of the first disc (in $\text{kg m}^2$) is}
A wheel is rotating at 1800 rpm about its own axis. When the power is switched off, it comes to rest in 2 minutes. Then the angular retardation in $\text{rad s}^{-2}$ is}
Pick out the wrong statement from the following
If the angular momentum of a particle of mass $m$ rotating along a circular path of radius $r$ with uniform speed is L, the centripetal force acting on the particle is
In elastic collision
The total energy of a solid sphere of mass 300 g which rolls without slipping with a constant velocity of 5 ms\(^{-1}\) along a straight line is
A bullet when fired into a target loses half of its velocity after penetrating 20 cm. Further distance of penetration before it comes to rest is
Two blocks of masses 2 kg and 4 kg are attached by an inextensible light string as shown in the figure. If a force of 120 N pulls the blocks vertically upward, the tension in the string is (take \(g = 10 \text{ ms}^{-2}\))
A cyclist bends while taking turn in order to
A ball of mass 10 g moving perpendicular to the plane of the wall strikes it and rebounds in the same line with the same velocity. If the impulse experienced by the wall is 0.54 Ns, the velocity of the ball is
A particle has the position vector $\vec{r} = \hat{i} - 2\hat{j} + \hat{k}$ and the linear momentum $\vec{p} = 2\hat{i} - \hat{j} + \hat{k}$. Its angular momentum about the origin is}
A particle starting with certain initial velocity and uniform acceleration covers a distance of 12 m in first 3 seconds and a distance of 30 m in next 3 seconds. The initial velocity of the particle is
The vertical component of velocity of a projectile at its maximum height ($u$ – velocity of projection, $\theta$ – angle of projection) is
The coordinates of a particle moving in $x-y$ plane at any instant of time $t$ are $x = 4t^2$; $y = 3t^2$. The speed of the particle at that instant is
The ionospheric layer acts as a reflector for the frequency range
In a simple pendulum experiment, the maximum percentage error in the measurement of length is 2% and that in the observation of the time-period is 3%. Then the maximum percentage error in determination of the acceleration due to gravity \( g \) is
The pitch and the number of circular scale divisions in a screw gauge with least count 0.02 mm are respectively
A ball is dropped from the top of a tower of height 100 m and at the same time another ball is projected vertically upwards from ground with a velocity 25 ms\(^{-1}\). Then the distance from the top of the tower, at which the two balls meet is
The ratio of distances traversed in successive intervals of time when a body falls freely under gravity from certain height is
The collector resistance and the input resistance of a CE amplifier are respectively 10 k\(\Omega\) and 2 k\(\Omega\). If \(\beta\) of the transistor is 49, the voltage gain of the amplifier is
The light emitting diode (LED) is
If the heights of transmitting and the receiving antennas are each equal to $h$, the maximum line-of-sight distance between them is (R is the radius of earth)