A p-type semiconductor can be obtained by doping of:

A coil of inductance 0.50 H and resistance 100 \( \Omega \) is connected to 240 V, 50 Hz supply. The maximum current in the coil is:

A 50 Hz AC current of crest 1 A flows through a transformer primary. With mutual inductance 0.5 H, the crest voltage induced in secondary is :

A white light falls on a prism. Among given choices which light bends the least?

The energy of electron in the first excited state of Hydrogen atom is -3.4 eV. The potential energy of this electron is :

The ratio of shortest wavelength of lines in Balmer and Paschen series is :

The internal resistance of primary cell is \( 3 \Omega \). It generates a current of \( 0.3 \text{ A} \) in an external resistance of \( 22 \Omega \). The rate at which chemical energy is consumed in providing the current is:

Which of the following is a transducer?

Which of the following species has become extinct due to over exploitation by humans?

Answer the question on the basis of passage given below :
One of the notable features of the transition element is the great variety of oxidation states it may show in its compounds. The elements which give the greatest number of oxidation states occur in or near the middle of the series. Manganese, for example exhibits all the oxidation states from +2 to +7. The lesser number of oxidation states at the extreme ends is either due to losing or sharing of few electrons (Sc, Ti) or too many d electrons of higher valence. Early in the first series scandium (II) is virtually unknown and titanium (IV) which is more stable than Ti (III) or Ti (II). On the other end, the only oxidation state of zinc is \(+ 2\).
Cris reducing but Mn is oxidising in nature although both have \(d ^{ 1 }\) configuration. It is due to the reason that Cr configuration changes from

Arrange the following steps of the Hershey and Chase experiment in correct sequence:
(A) Labelling of some bacteriophages with radioactive phosphorus and some with radioactive sulfur.
B) Agitating in blender followed by centrifugation.
(C) Infecting E. coli in two batches with two differently labelled bacteriophages.
(D) Identification of radioactivity in supernatant and sediment
Choose the correct answer from the options given below:

The infective stage of malarial parasite, Plasmodium is:

Pick the correct structure for carbolic acid among the following compounds: