List of top Physics Questions

Chromatic aberration of lens can be corrected by
At sea level, the value of $g$ is minimum at
Sound waves cannot propagate through vacuum but light waves can. Sound waves cannot be polarised but light waves can be.
Four capacitors each of capacitance C are in parallel combination. The equivalent capacitance is:
Optically active substance among the following is
A convex lens is placed in a medium in which it behaves like a glass plate. The refractive index of the medium, will be
When a large bubble rises from the bottom of a lake to the surface, its radius is doubled. The atmospheric pressure is equal to that of a column of water of height $H$. The depth of the lake is
What can be the angle between $\vec{P}+\vec{Q}$ and $\vec{P}-\vec{Q}$ ?
If the magnetic field is parallel to a surface, then magnetic flux at right angle to the surface, is
In a pure semiconductor crystal, if current flows due to breakage of crystal bonds, then the semiconductor, is called
The temperature of the sun is measured with
Which of the following is the infrared wavelength?
A beam of light in air enters into the water. Which of the following characteristics of light will not change?
In Lenz?s law, there is a conversion of
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$(\mu F)$