List of top Physics Questions

A satellite moves in elliptical orbit about a planet. Its maximum and minimum velocities of satellites are $ 3\times 10^4 \, m/s $ and $ 1 \times 10^3 \, m/s $ respectively. What is the minimum distance of satellite from planet is maximum distance if $ 4 \times 10^4\, km $
When light travels from one medium to the other of which the refractive index is different, then which of the following will change ?
Air is pumped into an automobile tube upto a pressure of 200 kPa in the morning when the air temperature is 22$^{\circ}$C. During the day, temperature rises to 42$^{\circ}$C and the tube expands by 2 %. The pressure of the air in the tube at this temperature, will be approximately
A ray PQ incident on the refracting face BA is refracted in the prism BA C as shown in the figure and emerges from the other refracting face AC as RS, such that AQ = AR. If the angle of prism $A = 60^\circ$ and the refractive index of the material of prism is $\sqrt 3,$ then the angle of deviation of the ray is
A thin lens made of glass of refractive index $\mu = 1.5$ has a focal length equal to 12 cm in air. lt is now immersed in water $\bigg(\mu = \frac{4}{3}\bigg).$ Its new focal length is
Two capillary of lengths L and 2L and of radii R and 2R are connected in series. The net rate of flow of fluid through them will be (Given rate of the flow through single capillary.$X=\frac{\pi pR^4}{8\eta L})$
Ideal gas and real gas have major difference of
A 16 kg block moving on a frictionless horizontal surface with a velocity of 4 m/s compresses an ideal spring and comes to rest. If the force constant of the spring be 100 N/m, then the spring is compressed by
The following truth table corresponds to the logic gate
A mass of $ 400\,g $ and a mass of $ 100\,g $ have same $ KE $ , then the ratio of their momentums will be
Keeping the banking angle same, to increase the maximum speed with which a vehicle can travel on the curved road by $ 10\% $ , the radius of curvature of the road has to be changed from $ 20\,m $ to
Four balls each of radius $ 10\, cm $ and mass $ 1\, kg, 2\, kg, 3\, kg $ and $ 4 \,kg $ are attached to the periphery of massless plate of radius $ 1\,m $ .
What is moment of inertia of the system about the centre of plate ?
As temperature of a black body is raised, wavelength corresponding to maximum energy reduces. Higher temperature would mean higher energy and hence higher wavelength.
Angular width of central maxima in the Fraunhofer's diffraction pattern is measured. Slit is illuminated by the light of wavelength 6000 $\mathring {A}$. If slit is illuminated by light of another wavelength, angular width decreases by 30%. Wavelength of light used is
A capacitor of suitable capacitance can be used in an circuit in place of the choke coil. A capacitor blocks DC and allows AC only.
In an AC circuit, V and i are given by V = 100 sin (100t) volt and i = 100 sin $ \bigg( 100 t + \frac{ \pi}{ 3} \bigg) $ amp .The power dissipated in the circuit is
The angle of dip at a place on the earth gives
Torques $\tau_1 $ and $\tau_2$ are required for magnetic needle to remain perpendicular to the magnetic fields $B_1 $ and $B_2$ at two different places. The ratio $B_1 / B_2$ is
Two instruments having stretched strings are being played in unison. When the tension of one of the instruments is increased by $1\%, 3$ beats are produced in $2\,s$ . The initial frequency of vibration of each wire is:
Two conducting spheres of radii $R_{1}$ and $R_{2}$ are charged with charges $Q_{1}$ and $Q_{2}$ respectively. On bringing them in contact, there is
The minimum energy to ionize an atom is the energy required to
The moment of inertia of a uniform thin rod of length $L$ and mass $M$ about an axis passing through a point at a distance of $ \frac{L}{3} $ from one of its ends and perpendicular to the rod is
An electric immersion heater of $1.08 \,kW$ is immersed in water. After the water has reached a temperature of $ 100^{\circ }\,C, $ how much time will be required to produce $100\, g $ of steam?
A wire carrying current $i$ and other carrying $2i$ in the same direction produce a magnetic field $B $ at the midpoint. What will be the field when $2i$ current is switched off?
A closed vessel contains $8\, g$ of oxygen and $7\,g$ of nitrogen. The total pressure is $10$ atm at a given temperature. If now oxygen is absorbed by introducing a suitable absorbent the pressure of the remaining gas (in atm) will be