A coil when given supply of 20 V D.C. draws a current of 4 A. When the same coil is given supply of 20 V A.C. with 80 Hz, draw a current of 2 A. The self Inductance of the coil is :

If the speeds of gamma rays, X-rays and microwaves are \( V_g \), \( V_x \) and \( V_m \), respectively in free space, then the correct relation between them is:

The refractive indices of glass and water are \( \frac{3}{2} \) and \( \frac{4}{3} \), respectively. If the speed of light in water is \( 2.25 \times 10^8 \, \text{m/s} \), the speed of light in glass will be:

In a series LCR circuit if the voltage across inductor, capacitor and resistor respectively are 60 V, 30 V and 40 V, then the applied voltage is:

Identify the correct statement(s) from the following Resistivity (\( \rho \)) versus Temperature (T) graphs :

(A) Graph (i), shows \(\rho\) versus \(T\) variation for Copper
(B) Graph (ii), shows \(\rho\) versus \(T\) variation for Silicon
(C) Graph (iii), shows \(\rho\) versus \(T\) variation for semiconductor
(D) Graph (iii), shows \(\rho\) versus T variation for Nichrome
Choose the correct answer from the options given below :

The magnetic susceptibility of the material of a rod is 499. Permeability of vacuum is \( 4\pi \times 10^{-7} \text{ H/m} \). The absolute permeability of the material of the rod is:

The current in a coil falls from 10.0 A to 0.0 A in 0.1 s. If an average emf of 100 V is induced in the coil, then the self inductance of the coil is.

Identify the correct statements in the context of paramagnetic substances.
(A) In external magnetic field B, individual atomic dipole moment points in opposite direction of B.
(B) Susceptibility is small and positive.
(C) In non-uniform magnetic field, the paramagnetic bar will tend to move from weak field to strong.
(D) Examples of paramagnetic substances are Aluminium, Sodium and oxygen.
Choose the correct answer from the options given below:

\(\int_{3 \pi / 8}^{\pi / 8} \frac{\tan ^{2025} x}{\tan ^{2025} x+\cot ^{2025} x} d x\) is equal to

Thorn of Bougainvillea and tendril of Cucurbita represent:

Answer the question on basis of passage given below :
P block elements are placed in groups 13 to 18 of the periodic table. Their valence shell electronic configuration is \(ns^2 np^{1-6}\). Group 16 of the p block elements are known as the group of chalcogens having \(ns^2 np^4\) as their general electronic configuration. They exhibit number of oxidation states but the stability of \(- 2\) oxidation state decreases down the group. They are sometimes also known as group of chalcogens as the name is derived from the Greek word for brass and points to the association of sulphur and its congeners with copper. Their ionisation enthalpy decreases down the group. Oxygen shows anomalous behaviour due to its small size and high electronegativity.
What will be the products formed in the following equation?

Identify the correct properties of equipotential surfaces among the following.
(A) No work is done in moving a test charge over an equipotential surface.
(B) Electric field is always normal to the equipotential surface at every point.
(C) Equipotential surfaces are closer together in the regions of the strong electric field and farther apart in the regions of the weak electric field.
(D) No two equipotential surfaces can intersect each other.
Choose the correct answer from the options given below:

A graph is plotted between \(\text{ln}\ k\) and \(\frac{1}{T}\). What is the value of slope?