List of top Physics Questions

An infinitely long thin straight wire has uniform charge density of $\frac {1}{4} \times 10^{-2} cm^{-1}.$ What is the magnitude of electric field at a distance $20\, cm$ from the axis of the wire ?
The electric field lines on the left have twice the separation on those on the right as shown in figure. If the magnitude of the field at $A$ is $40\,Vm^{-1}$, what is the force on $20\,\mu \,C$ charge kept at $B$?
A train whistling at constant frequency 'n' is moving towards a station at a constant speed V. The train goes past a stationary observer on the station. The frequency 'n' of the sound as heard by the observer is plotted as a function of time 't'. Identify the correct curve
A tray of mass $12 \,kg$ is supported by two identical springs as shown in figure. When the tray is pressed down slightly and then released, it executes SHM with a time period of $1.5\,s$. The spring constant of each spring is
A certain amount of heat energy is supplied to a monoatomic ideal gas which expands at constant pressure. What fraction of the heat energy is converted into work ?
In an adiabatic expansion of an ideal gas the product of pressure and volume
A sphere, a cube and a thin circular plate all of same material and same mass initially heated to same high temperature are allowed to cool down under similar conditions. Then the
Iceberg floats in water with part of it submerged. What is the fraction of the volume of iceberg submerged if the density of ice is $\rho_i = 0.917 \,g\,cm^{-3}$ ?
A wheel starting from rest gains an angular velocity of $10$ rad/s after uniformly accelerated for $5$ sec. The total angle through which it has turned is
Young's modulus of a perfect rigid body is
The value of acceleration due to gravity at a height of $10\,km$ from the surface of earth is $x$. At what depth inside the earth is the value of the acceleration due to gravity has the same value $x$?
A double concave lens of refractive index 1.5 with its two spherical surfaces of radii R1 = 30 cm and R2 = 45 cm is kept in air. Its focal length is
A convex lens has a focal length of 10 cm. If u is the object distance, then the image distance is given by
The angle between the paraxial rays and principal axis is
A bird is flying vertically downwards the surface of water of a lake with constant speed. For a fish inside the water exactly below the bird, the bird appears to be
To examine the internal organs of a human body through light, the doctors use
A rectangular tank of depth 4 m is full of water of refractive index \(\frac{4}{3}\). When viewed from the top, the bottom of the tank is seen at a depth of 
The total internal reflection in diamond makes it shine, because the critical angle of diamond is
Ghee is converted from liquid to solid state during winter season. This process is called
40 g of water at 60°C is added to. 60g of water at 30°C. The final temperature of their mixture is
Humidity means
Which among the following pair of units measure the temperature?
A bar magnet is moved towards a coil (a) slowly, (b) quickly. The induced EMF is
The magnetic field lines due to the horseshoe magnet between its poles are
A conductor moving with a speed of 20 m/s in the direction perpendicular to the direction of magnetic field of induction 0.5 T, induces an EMF of 5 V. The length of the conductor is