List of top Physics Questions

A spring executes S.H.M. with mass 10 kg attached to it. The force constant of the spring is 10 N/m. If at any instant its velocity is 40 cm/s, the displacement at that instant is (Amplitude of S.H.M. = 0.5 m)

The length of the seconds pendulum is decreased by 0.3 cm when it is shifted from place A to place B. If the acceleration due to gravity at place A is 981 cm/s\(^2\), the acceleration due to gravity at place B is (Take \( \pi^2 = 10 \))

Two unit vectors \( \hat{a_1} \) and \( \hat{a_2} \) are inclined to each other at an angle \( \theta \). If \( | \hat{a_1} - \hat{a_2} | = \sqrt{3} \), then the value of \( ( \hat{a_1} - \hat{a_2} ) \cdot ( 2\hat{a_1} - \hat{a_2} ) \) is

The maximum error in the measurement of mass and length is 4% and 3% respectively. The error in the measurement of density of a cube will be

The radius of the orbit of a geostationary satellite is (mean radius of the earth is \( R \), angular velocity about an axis is \( \omega \), and acceleration due to gravity on earth's surface is \( g \))

If two sources emit light waves of different amplitudes then in interference pattern

A thin circular ring of mass \( M \) and radius \( R \) is rotating about a transverse axis passing through its centre with constant angular velocity \( \omega \). Two objects each of mass \( m \) are attached gently to the opposite ends of a diameter of the ring. What is the new angular velocity?

Out of the fundamental forces in nature, maximum and minimum range is respectively for

The angle made by a vector \( \vec{B} = 3\hat{i} + 2\hat{j} + 4\hat{k} \) with the y-axis is

In a transistor amplifier, base-emitter junction is forward biased and collector-emitter junction is reverse biased. The current gain is

An electron makes a transition from an excited state to the ground state of a hydrogen-like atom. Out of the following statements, which one is correct?

When the observer moves towards a stationary source with velocity \( V_o \), the apparent frequency of emitted note is \( F_1 \). When the observer moves away from the source with velocity \( V_o \), the apparent frequency is \( F_2 \). If \( V \) is the velocity of sound in air and \( \frac{F_1}{F_2} = 2 \), then \( \frac{V}{V_o} \) is equal to

The ratio of the specific heats \( \frac{C_p}{C_v} = \gamma \) in terms of degrees of freedom 'n' is given by

Two parallel wires of equal lengths are separated by a distance of 3m from each other. The currents flowing through the first and second wire are 3A and 4.5A respectively in opposite directions. The resultant magnetic field at the mid-point of both the wires is \( \mu_0 \) (permeability of free space) is

A thin uniform rod of length 'L' and mass 'M' is bent at the middle point 'O' at an angle of 45° as shown in the figure. The moment of inertia of the system about an axis passing through 'O' and perpendicular to the plane of the bent rod, is

The intensity of the primary maximum in a two-slit interference pattern is given by \(I_2\), and the intensity of the primary maximum in a three-slit interference pattern is given by \(I_3\). Assuming the far-field approximation, same slit parameters, and same incident light intensity in both cases, \(I_2\) and \(I_3\) are related as:

A football of radius \(R\) is kept on a hole of radius \(r ( r < R )\) made on a plank kept horizontally. One end of the plank is now lifted so that it gets tilted making an angle \(\theta\) from the horizontal as shown in the figure below. The maximum value of \(\theta\) so that the football does not start rolling down the plank satisfies (figure is schematic and not drawn to scale)

Match the following and select correct option:

Group-A		Group-B
(1)	DYNAMO rule	(A)	Gauss
(2)	Magnetic field	(B)	Fleming's right hand rule
(3)	Electro magnet	(C)	Weber
(4)	Magnetic flux	(D)	Microphone

In the balanced condition, the values of the resistances of the four arms of a Wheatstone bridge are shown in the figure below. The resistance $R_{3}$ has temperature coefficient $00004^{\circ} C ^{-1}$. If the temperature of $R_{3}$ is increased by $100{ }^{\circ} C$, the voltage developed between $S$ and $T$ will be ______ volt

A point charge 'q' is placed at the corner of a cube of side 'a' as shown in the figure. What is the electric flux through the face ABCD?

In Young’s double slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes :

The quantities of heat required to raise the temperature of two solid copper spheres of radii \(r _1\) and \(r_2\)  \((r_1=1.5 r_2 )\) through \(1 K\) are in the ratio

A charged particle having drift velocity of \(7.5×10^{−4} m s^{−1} \) in an electric field of  has a mobility in  \(m^2 V^{−1} s^{−1}\) of :

Sometimes it is convenient to construct a system of units so that all quantities can be expressed in terms of only one physical quantity. In one such system, dimensions of different quantities are given in terms of a quantity $X$ as follows: $[$ position $]=\left[X^{\alpha}\right] ;[$ Speed $]=\left[X^{\beta}\right] ;[$ acceleration $]=\left[X^{p}\right] ;[$ Linear momentum $]=\left[X^{q}\right] ;$ [force] $=\left[X^{ r }\right]$. Then

Consider two spherical perfect blackbodies with radii \(R_1\) and \(R_2\) at temperatures \(T_1 = 1000\, \text{K}\) and \(T_2 = 2000\, \text{K}\), respectively. They both emit radiation of power 1 kW. The ratio of their radii, \(R_1/R_2\), is given by ...............