The power factor of an RL circuit is \( \frac{1}{2} \). If the frequency of a.c. is doubled, the power factor will be :

When monochromatic orange light is used instead of violet light in a convex lens, its focal length will :

During forward bias in a p-n junction :

A capacitor of \( 25 \mu \text{F} \) is connected in series with d.c Voltage of 5 V. The value of current in the circuit will be:

Which of the following element has highest binding energy per nucleon ?

A circular coil of radius 2.0 cm carries a current of 1.0 A. If the coil has 50 turns, the magnetic field at the centre of the coil will be:

Which of the following is NOT the property of electric field lines?

An unpolarized light of intensity \(I_0\) is passed through a polariser and is incident on an analyser making an angle of \((\pi/6) \text{ rad}\) with that of the polariser. The intensity of the light transmitted from the analyzer is

The lines \(\frac{x}{1}=\frac{y}{2}=\frac{z}{3}\) and \(\frac{x-3}{-3}=\frac{y-4}{-6}=\frac{z-5}{-9}\) are :

Answer the question on basis of passage given below :
Transition metals form a large number of complexes or coordination compounds in which the metal atoms are bound to a number of anions or neutral molecules. The valence bond theory explain the formation, magnetic behaviour and geometrical shapes while the crystal field theory explains the effect of different crystal fields on the degeneracy of d-orbitals energies of the central metal atom/ion. This provides for the quantitative estimation of orbital separation energies, magnetic moments and spectral and stability parameters.
Amongst the following ions which should have the highest magnetic moment value?

The rate of production of organic matter during photosynthesis is defined as -

Two thin lenses are in contact and the focal length of the combination is 60 cm. If the focal length of one lens is 20 cm, the focal length of the other would be :

Identify the product C in the following sequence of reactions :
\(\text{CH}_3 - \text{CH(OH)} - \text{CH}_3 \xrightarrow{\text{Cu, 573 K}} \text{A} \xrightarrow{\text{CH}_3\text{MgBr}} \text{B} \xrightarrow{\text{H}_3\text{O}^+} \text{C}\)