List of top Physics Questions

Of the diodes shown in the following diagrams, which one is reverse biased?
A ray of light strikes a plane water-air interface from within the water at an angle of incidence i. Which one of the following statements is corredt?
The Brewster angle for the glass-air interface is $54.74^{\circ}$. If a ray of light going from air to glass strikes at an angle of incidence $45^{\circ}$, then the angle of refraction is (given, $\tan 54.74^{\circ}=\sqrt{2}$ )
Two masses $m_1$ = 5 kg and $m_2$ = 4.8 kg tied to a string are hanging over a light frictionless pulley. What is the acceleration of the masses when lift is free to move? (g = 9.8 $ms^{-2}$)
The coefficient of static friction, $ {{\mu }_{s}}, $ between block $A$ of mass $2 \,kg$ and the table as shown in the figure, is $0.2$. What would be the maximum mass value of block $B$ so that the two blocks do not move ? The string and the pulley are assumed to be smooth and massless $ (g=10\,m/{{s}^{2}}) $
The coefficient of real expansion of mercury is $0.18 \times 10^{-3} C^{-1}$ If the density of mercury at $0^{\circ}\,C$ is $13.6\, g/cc$, its density at $473 \,K$ will be
In an L-C-R series AC circuit at resonance
Mercury boils at 367$^{\circ}$C. However, mercury thermometers are made such that they can measure temperature upto 500$^{\circ}$C. This is done by
A coil of $40\, H$ inductance is connected in series with a resistance of $ 8\,\Omega $ and the combination is joined to the terminals of a $2 \,V$ battery. The time constant of the circuit is
A round disc of moment of inertia $ {{I}_{2}} $ about its axis perpendicular to its plane and passing through its centre is placed over another disc of moment of inertia $ {{I}_{1}} $ rotating with an angular velocity $\omega$ about the same axis. The final angular velocity of the combination of discs is
The ratio of the radii of gyration of a circular disc about a tangential axis in the plane of the disc and of a circular ring of the same radius about a tangential axis in the plane of the ring is
If $ {{\lambda }_{m}} $ denotes the wavelength at which the radiative emission from a black body at a temperature $T \,K$ is maximum, then
When three identical bulbs of $60\, W, 200\, V$ rating are connected in , series to a $200\, V$ supply, the power drawn by them will be
What is the refractive index of a prism whose angle $ A=60{}^\circ $ and angle of minimum deviation $ {{d}_{m}}=30{}^\circ $ ?
A thin prism $R_{1}$ of angle $4^{\circ}$ and refractive index $1.54^{\circ}$ is combined with another thin prism $P_{2}$ of refractive index $1.72$ to produce dispersion without deviation. The angle of $P_{2}$ is
The number of turns in primary coil of a transformer is $20$ and the number of turns in the secondary is $10$. If the voltage across the primary is $220 \,V$, what is the voltage across the secondary?
When a number of small droplets combines to form a large drop, then
An alternating current is given by $I = I _{1} \cos \omega t +I_{2} \sin \omega t$, the root mean square current is given by
An object is placed at a distance equal to focal length of convex mirror. If the focal length of the mirror be $ f, $ then the distance of the image from the pole of the mirror is:
Two identical masses $m$ moving with velocities $u_{1}$ and $u_{2}$ collide perfectly inefasticatiy. Find the loss in energy.
Which of the following has negative temperature coefficient of resistance?
Which of the following has smallest value
Which of the following has the highest moment of inertia when each of them has the same mass and the same radius?
Which of the following is a characteristic of turbulent flow?
Which of the following instruments has minimum least count ?