List of practice Questions

A coil has $N$ turns and current passes through it is $I$ ampere then we obtain $L$ of self inductance. Now if current is made doubled then new self inductance be ______ H.
The dimensional formula of $\frac{B^2}{2\mu_0}$ is ______.
Two concentric circular coils, one of small radius $r_1$ and the other of large radius $r_2$, such that $r_1 \ll r_2$, are placed co-axially with centres coinciding. The mutual inductance $M$ of the arrangement is proportional to ______.
The magnetic susceptibility $\chi$ for superconductors is ______.
A closely wound solenoid of 800 turns and area of cross section $2.5 \times 10^{-4}$ m$^2$ can carry a current of 3.0 A. The magnetic moment associated with it is ______.
A charged particle having charge $q$ is moving perpendicularly to the uniform magnetic field with linear speed $v$ on a circular path of radius $R$. The periodic time of revolution of a particle ______.
A horizontal overhead power line carries a current of 90 A in east to west direction. What is the magnitude and direction of the magnetic field due to the current 1.2 m above the line?
In the moving coil galvanometer, if number of turns in the coil is doubled, then the current sensitivity ______ and the voltage sensitivity ______.
On increasing the temperature of a conductor, for free electrons ______ increases.
The Wheatstone bridge is in balanced condition in the given figure (assume branches are 2$\Omega$, 6$\Omega$, X, and 12$\Omega$ in order), then X = ______.
The emf of a storage battery of a car is 6.0 V. If internal resistance of the battery is 0.2 $\Omega$, then maximum power drawn from the battery is ____ W.
A metal rod of length 10 cm and a rectangular cross section of 1 cm $\times$ 1/2 cm is connected to a battery across opposite faces. The resistance will be _____.
An electric dipole of dipole moment $\vec{P}$ is placed parallel to the uniform electric field of intensity $\vec{E}$. On rotating it through angle of 90° from this situation, the amount of work done is ______.
The total charge on a uniformly charged spherical shell having radius R is Q. Then electric potential at a distance $r = R/2$ from the centre of the shell ______.
A parallel plate capacitor with air between the plates has a capacitance of 1.0 pF. If the distance between the plates is made doubled and space between them is filled with dielectric substance, the capacitance becomes 2.0 pF. Then the value of dielectric constant of dielectric substance is ______.
Two infinitely long thin straight parallel wires are kept a perpendicular distance $2R$ having uniform linear charge densities $+\lambda$ and $-\lambda$ respectively. The magnitude of electric field at a mid point between two wires will be ______.
If charge $q$ is placed on one of the vertex of a cube, then total electric flux passing through the cube is ______.
A proton and a $\alpha$-particle are placed in uniform electric field. Accelerations produced in them are $a_p$ and $a_\alpha$ respectively. Then $a_p : a_\alpha$ will be ______.
Out of the following impurities, which impurity is not a trivalent?
If the output frequency of a full-wave rectifier is 100 Hz, then input frequency will be ______.
When a forward bias is applied to a p-n junction. It ______.
The nuclides of $^{197}_{79}\mathrm{Au}$ and $^{196}_{80}\mathrm{Hg}$ are called ______ of each other

Identify the correct truth table of the given logic circuit. 

Consider a mixture $X$ which is made by dissolving $0.4$ mol of $[\mathrm{Co(NH_3)_5SO_4}]Br$ and $0.4$ mol of $[\mathrm{Co(NH_3)_5Br}]SO_4$ in water to make $4$ L of solution. When $2$ L of mixture $X$ is allowed to react with excess $\mathrm{AgNO_3}$, it forms precipitate $Y$. The rest $2$ L of mixture $X$ reacts with excess $\mathrm{BaCl_2}$ to form precipitate $Z$. Which of the following statements is CORRECT?
MnO₄²⁻, in acidic medium, disproportionates to: