Question Bank Directory

The calculated spin only magnetic moment of $Cr^{2+}$ ion is

An element X has the following isotopic composition: $^{200}$X: 90% $^{199}$X: 8.0% $^{202}$X: 2.0% The weighted average atomic mass of the naturally-occurring element X is closest to:

For a parallel beam of monochromatic light of wavelength $\lambda$, diffraction is produced by a single slit whose width $a$ is much greater than the wavelength of the light. If $D$ is the distance of the screen from the slit, the width of the central maxima will be:

Select the correct match: (1) Haemophilia - Y linked (2) Phenylketonuria - Autosomal dominant trait (3) Sickle cell anaemia - Autosomal recessive trait, chromosome-11 (4) Thalassemia - X linked

A particle mass m, charge Q, and kinetic energy T enter a transverse uniform magnetic field of induction $\vec{B}$. After 3 sec the kinetic energy of the particle will be:

Identify the substances having glycosidic bond and peptide bond, respectively in their structure:

A closed-loop PQRS carrying a current is placed in a uniform magnetic field. If the magnetic forces on segments PS, SR and RO (RQ) are $F_1$, $F_2$ and $F_3$ respectively and are in the plane of the paper and along with the directions shown, the force on the segment QP is

A current-carrying closed loop in the form of a right-angle isosceles triangle ABC is placed in a uniform magnetic field acting along AB. If the magnetic force on the arm BC is F, the force on the arm AC is:

In order to pass 10% of the main current through a moving coil galvanometer of 99 ohms, the resistance of the required shunt is:

A square loop, carrying a steady current I, is placed in a horizontal plane near a long straight conductor carrying a steady current I₁ at a distance d from the conductor as shown in figure. The loop will experience

The resistance of an ideal voltmeter is:

The energy equivalent of 0.5 g of a substance is:

A galvanometer having a resistance of $8\ \Omega$ is shunted by a wire of resistance $2\ \Omega$. If the total current is $1\ \text{A}$, the part of it passing through the shunt will be:

If an ammeter A reads 2 A and the voltmeter V reads 20 V, what is the value of resistance R? (Assuming finite resistances of ammeter and voltmeter)

If a square loop ABCD carrying a current i is placed near and coplanar with a long straight conductor XY carrying a current I, what will be the net force on the loop?

A voltmeter has a range $V$ with a series resistance $R$. With a series resistance $2R$, the range is $V'$. The correct relation between $V$ and $V'$ is:

A wire carrying current $I$ has the shape as shown in the adjoining figure. Linear parts of the wire are very long and parallel to X-axis while the semicircular portion of radius $R$ is lying in the Y-Z plane. The magnetic field at point $O$ is:

An electron moving in a circular orbit of radius r makes n rotations per second. The magnetic field produced at the centre has a magnitude:

The current flowing in a coil of resistance $90~\Omega$ is to be reduced by $90\%$. What value of resistance should be connected in parallel with it?

In which of the following pairs of molecules/ions, the central atoms have $sp^2$ hybridisation?