List of top Physics Questions

One quarter section is cut from a uniform circular disc of radius R. This section has a mass M. It is made to rotate about a line perpendicular to its plane and passing through the centre of the original disc. Its moment of inertia about the axis of rotation is
A thin wire of length L and uniform linear mass density p is bent into a circular loop with centre at O as shown. The moment of inertia of the loop about the axis XX ' is
An ideal gas is initially at temperature T and volume V. Its volume is increased by $\Delta$V due to an increase in temperature $\Delta$T, pressure remaining constant. The quantity 5 = $\Delta$V / V$\Delta$T varies with temperature as
A train moves towards a stationary observer with speed 34 m/s. The train sounds a whistle and its frequency registered by the observer is $f_1$. If the train's speed is reduced to 17 m/s, the frequency registered is $f_2$. If the speed of sound is 340 m/s, then the ratio $f_1/ f_2$ is
A block of ice at I0$^{\circ}$C is slowly heated and converted to steam at 100$^{\circ}$C. Which of the following curves represents the phenomena qualitatively?
You are provided three bulbs of 15, 40 and 60 watt. Which of them has lowest resistance:
When the displacement is half the amplitude the ratio of potential energy to the total energy is:
When light of wavelength 300 nm falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, however light of 600 nm wavelength is sufficient for creating photoemission. What is the ratio of the work functions of the two emitters:
Two point charges + 3 $ \mu C $ and + 8 $ \mu C $ repel each other with a force of 40 N. If a charge of - 5 $ \mu C $ is added to each of them, then the force between them will become:
The dominant mechanisms for motion of charge carriers in forward and reverse biased silicon $ \text{p-n} $ junctions are:
At constant volume, temperature is increased. Then:
For a hollow cylinder and a solid cylinder rolling without slipping on an inclined plane, then which of these reaches earlier
A (100 W, 200V) bulb is connected to a to V power supply. The power consumption would be:
12. If the binding energy per nucleon in $ L{{i}^{7}} $ and $ H{{e}^{4}} $ nuclei are respectively 5.60 MeV and 7.06 MeV, then energy of reaction $ L{{i}^{7}}+p\xrightarrow{{}}2\,{{\,}_{2}}H{{e}^{4}} $ is:
In a double slit experiment instead of taking slits of equal widths, one slit is made twice as wide as the other, then in the interference pattern
A glass slab of thickness 4 cm contains same number of waves as 5 cm thickness of water, when both are traversed by the same monochromatic light. If the refractive index of water is 4/3, what is the refractive index of glass:
A 10kg body hangs at rest from a rope wrapped around a cylinder of 0.2 m in diameter. The torque applied about the horizontal axis of the cylinder is:
A spring of force constant $k$ is cut into two pieces such that one piece is double the length of the other. Then the long piece will have a force constant of
Wavelength of light of frequency 100 Hz
Four particles of masses m, 2m, 3m and 4m are arranged at the corners of a parallelogram with each side equal to a and one of the angle between two adjacent sides as $ 60{}^\circ $ . The parallelogram lies in the $ x-y $ plane with mass m at the origin and 4m on the $ x- $ axis. The centre of mass of the arrangement will be located at
The escape velocity of a sphere of mass m is given by (G = Universal gravitational constant; M = Mass of the earth and R = Radius of the e earth)
If a unit vector is represented by $ 0.5 \widehat{ i} - 0 . 8 \widehat{j} + c \widehat{k}$ then the value of c is
A mirror forms a real image of unit magnification. Its nature is
A concave lens of glass, refractive index 1.5 has both surfaces of same radius of curvature R. On immersion in a medium of refractive index 1.75, it will behave as a
There are two liquid drops of different radii. The excess pressure inside over the outside is: