List of practice Questions

Angular width of ntral maximum of a diffraction pattern due to a single slit does not depend upon
Flux coming out from a unit positive charge kept in air is
Three point charges 1 C, 2 C and 3 C are plad at the corners of an equilateral triangle of side one metre. The work done to move these charges to the corners of another equilateral triangle of side 0.5 m is

Four metal plates, each with surfa area $A$ on one side, are plad with separation $d$ as shown in the figure. The capacitan between a and b is ($\varepsilon_0$ -- permittivity of free spa)

In order to quadruple the resistan of a uniform wire, a part of it is uniformly stretched so that the final length of the wire becomes $1.5$ times the original length. The fractional length of the stretched part is

In the circuit, the value of the current, $I$ is

For parallel conductors and steady currents, the results in accordan with Newton's third law are
Consider a tightly wound 100 turn coil of radius 10 cm carrying a current of 2A. The magnitude of the magnetic field at the ntre of the coil is
If B is magnetic field and q is the charge then the following represents the Gauss's law of magnetism
A circular coil of radius 10 cm and resistan of $2~\Omega$ is plad with its plane perpendicular to the horizontal component of the earth's magnetic field. It is rotated about its vertical diameter through $180^\circ$ in 0.25 s. If the magnitude of the indud emf is $3.8 \times 10^{-3} \text{ V}$, then the number of turns of the coil is (Horizontal component of earth's magnetic field at the pla is $3 \times 10^{-5} \text{ T}$)
An inductor of inductan L, a capacitor of capacitan C and a resistor of resistan R are connected in series to an ac sour. The quality factor of the circuit is
If $E_o$ and $B_o$ are the magnitudes of the electric and magnetic fields respectively of an electromagnetic wave in vacuum, then among the following the correct relation is ($\mu_o$ -- permeability of free spa, $\varepsilon_o$ -- permittivity of free spa)
Photoelectrons are emitted with maximum velocity $v$ when light of frequency $3f$ incidents on a photosensitive material of work function $2hf$. If the frequency of the incident light is $4.25 f$, the maximum velocity of the emitted photoelectrons is (h -- Planck's constant)
If '$\mu$' is the magnetic moment of an electron revolving around hydrogen nucleus in an orbit of principal quantum number 'n', then
A radioactive decay forms an isotope of the original nucleus with the emission of the following particles
A reverse biased zener diode when operated in the breakdown region works as
The current amplification factor and the collector current in a transistor circuit are 100 and 2.2 mA respectively. Then the base current is
Digital signal
The de Broglie wavelength of a particle is 1000 nm. What is its momentum? ($h=6.6 \times 10^{-34} \text{ J s}$)
If the unrtainty in velocity of an electron $(\Delta v)$ is $0.1 \text{ m/s}$, the unrtainty in its position $(\Delta x)$ is (given: $m_e = 9.1 \times 10^{-31} \text{ kg}$)

The number of following pairs of elements which exhibit diagonal relationship is:

  • i. B & Si
  • ii. Be & Al
  • iii. Li & Mg
  • iv. Al & S
The correct order of atomic radii of B, Be, N and C is

Match the following molecules with their dipole moments:

List IList II
\( \mathrm{H_2O} \)I. 0
\( \mathrm{BF_3} \)II. 0.23
\( \mathrm{NH_3} \)III. 1.47
\( \mathrm{NF_3} \)IV. 1.85
Which of the following is the correct order of increasing number of lone pair of electrons on the ntral atom?
The vapors of 1 g of an element occupy 2.5625 L exerting a pressure of 0.5 atm at 1000 K. What is the molar mass (in $\text{g mol}^{-1}$) of the element? (Assume vapors follow ideal gas equation. Given $R = 0.082 \text{ L atm mol}^{-1} \text{K}^{-1}$)