List of top Physics Questions asked in AFMC

A wheel is rotating at $900 \,rpm$ about its axis. When the power is cut off it comes to rest in $1$ min. The angular retardation in $rad/s^{-2}$ is

If a surface has a work function $4.0 \,eV$, what is the maximum velocity of electrons liberated from the surface when it is irradiated with ultraviolet radiation of wavelength $0.2\, \mu m$ ?

A resistor of $6 \, k \Omega$ with tolerance $10\%$ and another resistance of $4\, k \Omega$ with tolerance $10\%$ are connected in series. The tolerance of the combination is about

Which has more luminous efficiency?

A circular loop and a square loop are formed from the same wire and the same current is passed through them. Find the ratio of their dipole moments

In a magnetic field of $0.05\, T$ area of coil changes from $101 cm ^{2}$ to $100 \,cm ^{2}$ without changing the resistance which is $2 \,\Omega$. The amount of charge that flow during this period is

A jet of water with a cross-sectional area a is striking against a wall at an angle $ \theta $ to the horizontal and rebounds elastically. If the velocity of water jet is v and the density is $ \rho , $ the normal force acting on the wall is

Each capacitor shown in figure is $2 \mu F$. Then the equivalent capacitance between $A$ and $B$ is

Figure shows a uniform rod of length $30 \,cm$ having a mass of $3.0 \,kg$. The strings shown in the figure are pulled by constant forces of $20 \,N$ and $32 \,N$. Find the force exerted by $20 \,cm$ part of the rod on the $10\, cm$ pan. All the surfaces are smooth and the strings and pulleys are light

The Young's modulus of brass and steel are respectively $ 1.0\times 10^{11}Nm^{-2} $ and $ 2.0\times 10^{11}Nm^{-2}. $ .A brass wire and a steel wire of the same length are extended by $1 \,mm$ each under the same force. If radii of brass and steel wires are $R_B$ and $R_S$ respectively, then

Two cells of emf $ E_1 $ and $ E_2(E_1 > E_2) $ are connected as shown in figure. When a potentiometer is connected between A and B, the balancing length of the potentiometer wire is 300cm . On connecting the same potentiometer between A and C, the balancing length is 100 cm. The ratio $ \frac{E_1}{E_2} $ is

One-fourth length of a spring of force constant k is cut away. The force constant of the remaining spring will be

A clock $S$ is based on osculation of a spring and a clock $P$ is based on pendulum motion. Both clocks run at the same rate on earth. On a planet having the same density as earth but twice the radius

A number of condensers, each of the capacitance $1 \, \mu F$ and each one of which gets punctured if a potential difference just exceeding $500 \,V$ is applied, are provided. An arrangement suitable for giving capacitance of $2 \, \mu F$ across which $3000 \,V $ may be applied requires at least

Isogonic lines are those for which

The optical path of a monochromatic light is same if it goes through $4.0 \,cm$ of glass or $4.5 \,cm$ of water. If the refractive index of glass is $1.53$, the refractive index of the water is

An open water tight railway wagon of mass $ 5\times 10^{3}kg $ coasts at an initial velocity of $1.2\,ms^{-1}$ without friction on a railway track. Rain falls vertically downwards into the wagon. What change occurs in KE of the wagon, when it has collected $10^3\, kg$ of water?

The power factor of an $R-L$ circuit is $ \frac{ 1}{ \sqrt 2} $ . If the frequency of AC is doubled, what will be the power factor?

A galvanometer of resistance $ 15O $ gives full scale deflection for a current of $2\, mA$. Calculate the shunt resistance needed to convert it into an ammeter of range $5\,A$

A cyclist rides up a hill at a constant velocity. Determine the power developed by the cyclist if the length of the connecting rod of the pedal is $r = 25 \,cm$, the time of revolution of the rod is $t = 2 \,s$ and the mean force exerted by his foot on the pedal is $F = 15\, kgf$.

Generally the path of a projectile from the earth is parabolic but it is elliptical for projectile going to a very large height. Up to ordinary height the projectile moves under a uniform gravitational force, but for great heights, projectile moves under a variable force.

One-fourth length of a spring of force constant k is cut away. The force constant of the remaining spring will be

The output form of a full wave rectifier is

If $E=at+bt^2, $ what is the neutral temperature?

See the electrical circuit shown in this figure. Which of the following equations is a correct equation for it ?