List of top Physics Questions asked in KEAM

When a same force of 5 N is applied to two balls A and B separately, they move along the direction of the force with a velocity of 5 ms and 10 ms respectively. The rate of work done on the ball A to that on B are in the ratio
Water flows through a horizontal pipe of diameter $2 \,cm$ at a speed of $3 \,cm \,s^{-1}$, The pipe has a nozzle of diameter $0.5 \,cm$ at its end. The speed of water emerging from the nozzle is
Certain amount of heat is given to 100 g of copper to increase its temperature by 21 $^{\circ}$C. if the same amount of heat is given to 50 g of water, then the rise in its temperature is (specific heat capacity of copper = 400 Jkg$^{-1} K^{-1}$ and that for water =4200Jkg$^{-1}ZK^{-1}$
In a double slit experiment, the screen is placed at a distance of $1.25 \,m$ from the slits. When the apparatus is immersed in water $ ({{\mu }_{w}}=4/3) $ , the angular width of a fringe is found to be $ {{0.2}^{o}} $ . When the experiment is performed in air with same set up, the angular width of the fringe is
A copper wire with a cross-section area of $2 \times 10^{-6} \, m^2$ has a free electron density equal to $5 \times 10^{22} /cm^{-3}$. If this wire carries a current of $16\,A$, the drift velocity of the electron is
A metal conductor of length $1 \,m$ rotates vertically about one of its ends with an angular velocity $5 \,rad\, s^{-1}$. If the horizontal component of earths magnetic field is $0.2 \times10^{-4}\,T$, then the emf developed between the ends of the conductor is
A body of mass $m = 1\, kg$ is moving in a medium and experiences a fractions force $F = - kv$, where v is the speed of the body. The initial speed is $v_0 = 10 \, ms^{-1}$ and after 10s, its energy becomes half of initial energy. Then, the value of $k$ is
A uniform copper rod of $50\, cm$ length is insulated on the sides, and has its ends exposed to ice and steam respectively. If there is a layer of water 1 mm thick at each end, the temperature gradient (in $^{\circ}C m^{-1}$) in the bar is (Assume that the thermal conductivity of copper is $400 \, Wm^{-1} \, K^{-1}$ and water is $0.4 \, Wm^{-1} \, K^{-1}$)
The oscillating frequency of a cyclotron is $ 10 \,MHz $ . If the radius of its Dees is $ 0.5 \,m $ , the kinetic energy of a proton, which is accelerated by the cyclotron is
The angle of minimum deviation in an equilateral prism of refractive index 1.414 is
The acceleration of a moving body is found from the
If the amount of heat given to a system is $35\, J$ and the amount of work done on the system is $15\, J$, then the change in internal energy of the system is
A fighter aircraft is looping in a vertical plane. The minimum velocity at the highest point is (Given, r = radius of the loop)
The compressibility of water is $ 6\times {{10}^{-10}}{{N}^{-1}}{{m}^{2}} $ . If one litre is subjected to a pressure of $ 4\times {{10}^{7}}N{{m}^{-2}}, $ the decrease in its volume is
A circuit is made using $R_1, R_2, R_3, R_4$ and a battery as shown in the following figure. Find the equivalent resistance of the given circuit and the current passing through $R_3$
The resistance $R = \frac{V}{I}$ where $V = (100 \pm 5) V $ and $I = (10 \pm 0.2) A.$ The percentage error in R is
Consider a cylindrical conductor of Length L and area of cross section A. The specific conductivity varies as $\sigma (x) = \sigma_0 \frac{L}{\sqrt{x}}$ where x is the distance along the axis of the cylinder from one of its ends. The resistance of the system along the cylindrical axis is
Consider a circular loop of radius R on the xy-plane carrying a steady current anticlockwise. The magnetic field at the center of the loop is given by
lf the length of a seconds pendulum is increased by 2%, then in a day the pendulum
The ratio of hydraulic stress to the corresponding strain is known as
If $T$ is the surface tension of a liquid, the energy needed to break a liquid drop of radius $R$ into $64$ drops is
A wave of frequency $500\, Hz$ travels with a speed of $360 \,ms^{-1}$. The distance between two nearest points which are $60^{\circ}$ out of phase 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
An astronaut experiences weightlessness in a space satellite. It is because
An $LCR$ series circuit is at resonance. Then