List of top Physics Questions

A wave $y=a\sin (\omega t-kx)$ on a string meets with another wave producing a node at $x=0$. Then the equation of the unknown wave is:

Two particles $A$ and $B$ of equal masses are suspended from two massless springs of spring constants $k_1$ and $k_2$ respectively. If the maximum velocities, during oscillations, are equal, the ratio of amplitudes of $A$ and $B$ is:

A short linear object of length b lies along the axis of a concave mirror of focal length $\mathrm{f}$ at a distance $\mathrm{u}$ from the pole of the mirror. The size of the image is approximately equal to:

At a hydroelectric power plant, the water pressure head is at a height of $300m$ and the water flow available is $100m^3{s}^{-1}$. If the turbine generator efficiency is $60\mathrm{\%}$, estimate the electric power available from the plant. $($Given $g=9.8{ms}^{-2})$

If the angle of minimum deviation is equal to angle of a prism for an equilateral prism, then the speed of light inside the prism is _____

The ratio of the escape velocity and the orbital velocity is

An athlete runs along a circular track of diameter 80m. The distance travelled and the magnitude of displacement of the athlete when he covers \(\frac{3^{th}}{4}\) of the circle is ( in m)

The total electric flux through a closed spherical surface of radius ‘r’ enclosing an electric dipole of dipole moment 2aq is (Give ε₀ = permittivity of free space)

The correct relation of the following is

In the phenomenon of mutual induction, self induction of each of the coil persists Self induction arises when strength of current in one coil changes. In mutual induction, current is changing in both the individual coils

Three identical thin bar magnets, each of moment M, are placed along three adjacent sides of a regular hexagon as shown in the figure. The resultant magnetic moment of the system is

Dimensional formula for activity of a radioactive substance is

The acceleration one projectile relative to another projectile is

(a) A circular coil of 30 turns and radius 8.0 cm carrying a current of 6.0 A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.0 T. The field lines make an angle of 60° with the normal of the coil. Calculate the magnitude of the counter torque that must be applied to prevent the coil from turning. 
(b) Would your answer change, if the circular coil in (a) were replaced by a planar coil of some irregular shape that encloses the same area? (All other particulars are also unaltered.)

Four identical particles each of mass ''m'' are arranged at the corners of a square of side length ''L''. If one of the masses is doubled, the shift in the centre of mass of the system. w.r.t. diagonally opposite mass

Under electrostatic condition of a charged conductor, which among the following statements is true?

An equiconvex lens of radius of curvature 14 cm is made up of two different materials. Left half and right half of vertical portion is made up of material of refractive index 1.5 and 1.2 respectively as shown in the figure. If a point object is placed at a distance of 40 cm , calculate the image distance.

Two coherent waves are represented by \( y_1 = a_1 \cos \omega t \) and \( y_2 = a_2 \sin \omega t \), and they are superimposed on each other. The resulting intensity is proportional to:

An AC circuit has a resistance of 150 \(\Omega\), inductive reactance of 250 \(\Omega\), and capacitive reactance of 100 \(\Omega\). What is the phase difference between current and voltage?

An aeroplane is flying from city $ A $ to city $ B $ along path $ 1 $ . The path $ 1 $ is a circular arc whose centre coincides with the centre of the earth. Another aeroplane is flying along path $ 2 $ from $ A $ to $ B $ . The path $ 2 $ is circular arc whose centre is at $ C $ . $ O $ is the centre of the earth. Then,

Two point charges +2C and +6C repel each other with a force of 12 N. If a charge of - 2C is given to each of these charges the force will now be

A thin straight vertical conductor has 10 amp current flows vertically upwards. It is present at a place where $B_H = 4 \times 10^{-6}T$ . Arrange the net magnetic induction at the following points in ascending order a) at 0.5m on south of conductor b) at 0.5ra on west of conductor c) at 0.5m on east of conductor d) at 0.5m on north-east of conductor

Among the given pair of vectors, the resultant of two vectors can never be 3 units. The vectors are