List of top Physics Questions asked in KEAM

A galvanometer has 30 divisions and a sensitivity $ 16 \mu A/div $ . It can be converted into a voltmeter to read 3 V by connecting
lf the length of a seconds pendulum is increased by 2%, then in a day the pendulum
A simple harmonic motion is represented by $x(t) = \sin^2 \omega t - 2 \, \cos^2 \, \omega t$ . The angular frequency of oscillation is given by
If $T$ is the surface tension of a liquid, the energy needed to break a liquid drop of radius $R$ into $64$ drops is
If $ {{E}_{c}}=20\,\,\sin \,{{10}^{5}}\,\pi t $ and $ {{E}_{m}}=10\sin 400\pi t $ it are carrier and modulating signals, the modulation index is
If a body of mass m has to be taken from the surface of earth to a height $h = R$, then the amount of energy required is ($R$ = radius of earth)
In a pure inductive AC circuit
The velocity of sound is v at 273 K. The temperature at which it is 2v is
An astronomical telescope has an angular magnification of magnitude $5$ for distant objects. The separation between the objective and the eye-piece is $36 \,cm$ and the final image is formed at infinity. The focal length $ {{f}_{o}} $ of the objective and $ {{f}_{e}} $ of the eye-piece are respectively
In n- p-n transistor, the collector current is 10 mA. If 90% of the electrons emitted reach the collector, then
Electric charge is uniformly distributed along a long straight wire of radius $1\,mm$. The charge per cm length of the wire is $Q$ coulomb. Another cylindrical surface of radius $50 \,cm$ and length $1\, m$ symmetrically encloses the wire. The total electric flux passing through the cylindrical surface is
If a magnetic dipole of moment $M$ situated in the direction of a magnetic field $B$ is rotated by $180^{\circ}$, then the amount of work done is
An open organ pipe is closed suddenly with the result that the second overtone of the closed pipe is found to be higher in frequency by $ 100 $ than the first overtone of the original pipe. Then the fundamental frequency of the open pipe is
A given resistor has the following colour code of the various strips on it: Brown, black, green and silver. The value of its resistance in ohm is
Six capacitors each of capacitance of $2 \mu F$ are connected as shown in the figure. The effective capacitance between A and B is
In a Fraunhofer diffraction at single slit of width d with incident light of wavelength 5500 $\mathring {A}$, the first minimum is observed, at angle 30$^{\circ}$. The first secondary maximum is observed at an angle $\theta$
The following figure gives the movement of an object. Select the correct statement from the given choices.
A mass of $ 6 \,kg $ is suspended by a rope of length $ 2\, m $ from a ceiling. A force of $ 50 \,N $ in the horizontal direction is applied at the mid-point of the rope. The angle made by the rope with the vertical, in equilibrium is
A car of mass $1500\,kg$ is lifted up a distance of $30\,m$ by crane $A$ in $0.5$ minutes. The second crane $B$ does the same job in 1 minute. The ratio of their power is
A simple pendulum has a time period T in vacuum. Its time period when it is completely immersed in a liquid of density one-eighth of the density of material of the bob is
A thin circular ring of mass m and radius R is rotating about its axis perpendicular to the plane of the ring with a constant angular velocity $\omega$. Two point particles each of mass M are attached gently to the opposite ends of a diameter of the ring. The ring now rotates with an angular velocity $\omega /2$. Then, the ratio m/M is
To decrease the volume of a gas by 5% at constant temperature, the pressure should be
If the critical frequency for sky wave propagation is 12 MHz, then the maximum electron density in the ionosphere is
From the ground, a projectile is fired at an angle of $60$ degrees to the horizontal with a speed of $20\, m/s^{-1}$. Take acceleration due to gravity as $10 \, m/s^{-2}$. The horizontal range of the projectile is
If V is the gravitational potential on the surface of the earth, then what is its value at the centre of earth?