List of top Physics Questions

Conservation of linear momentum is equivalent to
If the mass of a body is $M$ on the surface of the earth, the mass of the same body on the surface of the moon is
The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy 6 eV fall on it is 4 eV. The stopping potential in volt is
A proton, a deuteron and alpha particle having the same kinetic energy are moving in circular trajectories in a constant magnetic field. $r_p, r_d $ and $r_{\alpha}$ denote respectively the radii of the trajectories of these particles, then
A mass m is moving with a constant velocity along a line parallel to the x-axis, away from the origin. Its angular momentum with respect to the origin
A whistle giving out 450 Hz approaches a stationary observer at a speed of 33 m/s. The frequency heard by the observer (in Hz) is (Speed of sound = 330 m/s) .
The breaking stress of a wire of length $ l $ and radius r is $ 5\,\,kg\,\,wt/{{m}^{2}} $ . The wire of length $ 2l $ and radius 2r of the same material will have breaking stress in $ (kwt/{{m}^{2}}) $ :
If the over bridge is concave instead of being convex. The thrust on the road at the highest position will be :
AT NTP the rms velocity of hydrogen molecules is 1.8 km/s. Under the same conditions the rms velocity of oxygen molecules in km/s will be:
An electric motor exerts a force of 40 N on a cable and pulls it by a distance of 30 m in one minute. The power supplies by the t motor will be:
The effective capacitance between the points $A$ and $B$ in the circuit shown in $(\mu F)$ is (capacitance of each capacitor is$(\mu F)$
Maximum and minimum values of the resultant of two forces acting at a point are $7\, N$ and $3\, N$ respectively. Then smaller force is equal to
The focal length of a plano convex lens is equal to its radius of curvature. The value of the refractive index of its material is
The normal magnifying power of a simple microscope is 6. The focal length of the convex lens uses is
Which of the following statement is correct?
Magnetic field due to a long straight conductor of length, carrying current at a point distance from it, is given by
The refractive index of water is 1.33. What will be the speed of light in water?
What will be the equivalent resistance between the two points A and D?
Suppose a tunnel is dug along the diameter of earth. A particle is dropped from a point at a distance $h$ directly above the tunnel. The earth's density is assumed uniform and the friction is neglected, then
A \(10\ eV\) electron is circulating in a plane at right angles to a uniform field at magnetic induction \({10}^{- 4}\ Wb/m^2\) (= \(1.0\) gauss), the orbital radius of electron is
A body dropped from a height h with initial velocity zero, strikes the ground with a velocity 3 m/s. Another body of same mass dropped from the same height h with an initial velocity of 4 m/s. The final velocity of second mass, with which it strikes the ground is
The energy stored in a capacitor of capacity C and potential V is given by
The dimensions of impulse are equal to that of
If a convex lens of focal length 80 cm and a concave lens of focal length 50 cm are combined together, what will be their resulting power?
A beam of electrons is moving with constant velocity in a region having electric and magnetic fields of strength $ 20 V m^{-1} $ and 0.5 T at right angles to the direction of motion of the electrons. What is the velocity of the electrons?