List of top Physics Questions

If \[ f(x)=\frac{1+x}{1-x} \] and \(A\) is a matrix such that \(A^{3}=0\), then \[ f(A)= \]
Consider the sequence of numbers \[ \{1,2,3,\dots,13\}. \] A person chooses three numbers at random from the sequence. The probability that the chosen three numbers form an A.P. is:
\(t_n\) denotes the nth term of an A.P. and \[ t_p=\frac{1}{q}, \qquad t_q=\frac{1}{p}. \] Then which one of the following options is a root of the equation \[ (p+2q-3r)x^{2}+(q+2r-3p)x+(r+2p-3q)=0? \]
The expression \[ \sum_{K=1}^{32}(3K+2)\left\{\sum_{r=1}^{10}\left(\sin\frac{2r\pi}{11}-i\cos\frac{2r\pi}{11}\right)\right\}^{K} \] represents:
A vector given by \[ \vec{P}=f(t)\hat{i}+g(t)\hat{j}+\hat{k} \] moves in such a way that it is always parallel to the vector \[ \vec{Q}=-f^{\prime\prime}(t)\hat{i}+f^{\prime}(t)\hat{j}+\hat{k}. \] The magnitude of \(\vec{P}\) is:
If \[ \sum_{r=1}^{\infty}\tan^{-1}\left(\frac{1}{2r^{2}}\right)=a, \] then \(\tan a\) is equal to:
Given \(P(x)=x^{4}+ax^{3}+bx^{2}+cx+d\) such that \(x=0\) is the only real root of \(P^{\prime}(x)=0\). If \(P(-1)\)
In an EM wave, if \(\vec{B}\) is along z-axis, then direction of \(\vec{E}\) and propagation will be:
Two coherent sources of intensity ratio \(9:1\) produce interference fringes. The ratio of maximum intensity to minimum intensity will be:
A dielectric is inserted between the plates of a capacitor connected to a battery. What happens?
A bar magnet of magnetic moment \(M\) is cut into two parts symmetrically, perpendicular to its length. Then magnetic moment of each part is:
Angular width of central maxima increases when:
To convert a galvanometer into an ammeter, we use:
Wavefront for a point source, near it, is:
Value of critical angle is maximum for light travelling from:
Two nuclei have mass numbers \(64\) and \(27\). The ratio of their nuclear densities is:
Ratio of radii of the 3rd orbit of H-atom and \(He^+\) ion will be:
Differentiate between inductive reactance, capacitive reactance and impedance of an ac circuit.
An ideal inductor and an ideal capacitor are connected in series across an ac voltage. Plot a graph showing variation of net reactance of the circuit with frequency of the applied ac voltage.
A passenger sitting in a train A moving at 90 km/h observes another train B moving in the opposite direction for 8 s. If the velocity of the train B is 54 km/h, then length of train B is:
The self inductance of a coil depends upon:
The efficiency of an ideal transformer is:
The forbidden energy gap in conductors is approximately:
A charged particle enters perpendicular to a uniform magnetic field. The path followed by the particle is:
In an AC circuit, the average value of alternating current over one complete cycle is:
The drift velocity of electrons in a conductor increases when: