List of top Physics Questions

A block of a certain material is heated to a temperature of $500^\circ\text{C}$ and then placed on a large ice block. If $455\text{ kg}$ of ice melts, find the mass of the block. Specific heat of the material is $39\text{ J/g}^\circ\text{C}$ and heat of fusion of water is $335\text{ J/g}$.
When a current of $5\text{ A}$ passes through the primary coil of a transformer of $200$ number turns, the magnetic flux linked with the secondary coil having $400$ turns is $600 \times 10^{-6}\text{ T m}^2$. Find the induced emf in the secondary coil, when the current in the primary coil increases at a rate of $2\text{ A s}^{-1}$.
A boy, standing at a certain height, kicks a football horizontally with a velocity of $16\text{ m s}^{-1}$. What will be the ratio of horizontal and vertical components of velocities after $2\text{ s}$? (Take $g = 8\text{ m s}^{-2}$)}
An electric coil is rated $400\text{ W}$, $200\text{ V}$. It is cut into two equal parts and connected in parallel to the same source of $200\text{ V}$. Calculate the percentage increase in energy produced per second.
In a uniform electric field $10\text{ N C}^{-1}$, an electric dipole of length $4\text{ cm}$ is placed with its axis making an angle $60^\circ$ with the electric field. If the dipole experiences a torque of $8\sqrt{3}\text{ N m}$, find the potential energy of the dipole.
The critical angle for a typical glass air interface is $42^\circ$. If a ray of light falls normally on one of the faces of the prism of angle $45^\circ$, the emergent ray will:
The moment of inertia of a square loop made of four uniform solid cylinders, each having radius R and length L (\(R \le L\)) about an axis passing through the mid points of opposite sides, is (Take the mass of the entire loop as M) :
If the charge on an object is doubled then electric field becomes
Which of the following statements is not true about electric field lines?
The magnetic induction at the centre $O$ in the figure shown is
In the figure shown, the magnetic field induction at the point $O$ will be
The nucleus of helium atom contains two protons that are separated by a distance $3.0 \times 10^{-15}$ m. The magnitude of the electrostatic force that each proton exerts on the other is
A steady current flow through a long straight wire of radius ' $a$ '. The current is uniformly distributed across its cross section. The ratio of the magnetic fields due to the wire at distance $\frac{a}{4}$ and $3a$ respectively from the axis of the wire is
Three long, straight parallel wires, carrying current, are arranged as shown in figure. The force experienced by a 25 cm length of wire $C$ is
What are the respective numbers of $\alpha$ and $\beta$ particles emitted respectively in the following radioactive decay? \[ {}_{90}^{200}X \longrightarrow {}_{80}^{168}Y \]
Current $I$ is flowing in conductor shaped as shown in the figure. The radius of the curved part is $r$ and the length of straight portion is very large. The value of the magnetic field at the centre $O$ will be
Which lens is used to correct Myopia?
Least distance of distinct vision for a healthy human eye is
Which of the following laws states that, “There is no accumulation of electric charge at any junction in an electric circuit”?
Ohm's law is valid for
The unit of power of a lens is
The image formed on the retina of human eye is
Splitting of white light into different colours is called as
The filament of an electric bulb is usually made of
If an incident ray passes through the center of curvature of a spherical mirror, the reflected ray will \dots