List of practice Questions

A capacitor of unknown capacitance is connected across a battery of $V$ volt. The charge stored in it is $Q$ coulomb. When potential across the capacitor is reduced by $V'$ volt, the charge stored in it becomes $Q'$ coulomb. The potential $V$ is
Which cation from the following does NOT form a colourless compound? (Atomic number: Cu = 29, Ti = 22, Zn = 30, Sc = 21)
Which of the following properties is NOT a colligative property?
An electron moves in a circular orbit of radius $r$ with uniform speed $v$. It produces magnetic field $B$ at the centre of the circle. The magnetic field $B$ is proportional to
S.I. unit of emissive power of a body at a given temperature is
Two coherent light sources of intensity ratio $n$ are employed in an interference experiment. The ratio of the intensities of the maxima and minima in the interference pattern is $(I_1>I_2)$
In potentiometer experiment, the balancing length with cell $E_1$ of unknown e.m.f. is $\ell_1$ cm. By shunting the cell $E_1$ with resistance $R$ which is equal to internal resistance $r$ of the cell $E_1$, the balancing length $\ell_2$ is
The ratio of areas of electron orbits for the second excited state to the first excited state in hydrogen atom, is
The resolving power of a telescope depends on
Which one of the following statements about the angle of contact $(\theta)$ is wrong?
There are three needles $N_1$, $N_2$ and $N_3$ made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. When a magnet is brought close to them, then it will
Figure shows triangular lamina which can rotate about different axis of rotation. Moment of inertia is maximum about the axis
In the case of earth, mean radius is $R$, acceleration due to gravity on the surface is $g$, angular speed about its own axis is $\omega$. What will be the radius of the orbit of a geostationary satellite?
The magnetic field developed due to current carrying coil at its centre is $B$. If the new coil of two turns is prepared from the above coil and same current is passed, then the magnetic field at the centre of the new coil will be
When a light ray is incident on a prism at an angle of $45^\circ$, the minimum deviation is obtained. If refractive index of material of prism is $\sqrt{2$, the angle of prism will be
The moduli of elasticity for a substance are Young’s modulus, Bulk modulus and Modulus of rigidity. All the three moduli of elasticity are possessed by
A light of wavelength $\lambda$ and intensity $I$ falls on photosensitive material. If $N$ photoelectrons are emitted, each with kinetic energy $E$, then
A mass $M$ moving with velocity $v$ along $x$-axis collides and sticks to another mass $2M$ which is moving along $y$-axis with velocity $3v$. After collision, the velocity of the combination is
Logic circuit shows the inputs $A$, $B$ and $C$. The output $Y$ is ‘0’ (zero) when
Imagine two bar magnets having same magnetic dipole moment $M$, are inclined with each other as shown in figure. Their resultant magnetic moment will be
A particle is performing vertical circular motion. The difference in tension at lowest and highest point is
The relative magnetic permeability $(\mu_r)$ of a substance is related to its susceptibility $(\chi)$ as
A spring produces extension $x$ by applying a force $F$. A body of mass $m$ suspended from the spring oscillates vertically with a period $T$. The mass of the suspended body is (neglect mass of spring)
In an LCR circuit, inductive reactance is $30\ \Omega$ and capacitive reactance is $30\ \Omega$. The resistance is found to be $40\ \Omega$. The probable impedance of the combination is
A metal surface is irradiated by radiations whose wavelength is $\lambda$. If the work function of the metal surface is negligibly small, then the de-Broglie wavelength of emitted electrons will be