The phase difference between the output and input of a common emitter amplifier is :

The wavelength will be minimum in the transitions of electrons from:

Match List-I with List-II for convex lens (symbols have their usual meanings)

List-I (Frequency Range)	List-II (EM Waves)
(A) \(4 \times 10^{14} Hz-7.5 \times 10^{14} Hz\)	(l) Infrared rays
(B) \(3 \times 10^{17} Hz-3 \times 10^{20} Hz\)	(II) Microwaves
(C) \(3 \times 10^9 Hz-3 \times 10^{11} Hz\)	(III) Visible Light
(D)\(3 \times 10^{11} Hz-4 \times 10^{14} Hz\)	(IV) X-rays

Choose the correct answer from the options given below :

A light bulb and an air core inductor are connected in series to an a.c. source through a switch. The switch is closed and after sometime, an iron rod is inserted into the interior of the inductor. The light bulb

A battery of emf 12 V and internal resistance \(3 \Omega\) is connected to a resistor. If the current in the circuit is 0.8 A, the terminal voltage of the battery, will be

The energy equivalent of 1 amu in MeV is

The radius of curvature of the path of a charged particle in a uniform magnetic field is directly proportional to the

Read the passage given below and answer the question.
The transition 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 extreme ends stems from either too few electrons to lose or share (Sc, Ti) on too many d-electrons (hence fewer orbitals available in which to share electrons with others) for higher valence \(( Cu , Zn )\). Thus early in the series scandium (II) is virtually unknown and titanium (IV) is more stable than Ti (III) or Ti (II). At the other end, the only oxidation state of zinc is \(+ 2\) (no d electrons are involved). The maximum oxidation states of reasonable stability correspond in value to the sum of the s - and d-electrons upto manganese ( \(Ti ^{I V} O _2, V^V O _2^{+}, Cr ^{V I} O _4^{2-}\), \(Mn ^{\text {VII }} O _4\) ) followed by a rather abrupt decrease in stability of higher oxidation states, so that the typical species to follow are \(Fe ^{I I, I I I}, Co ^{I I, I I I}, Ni ^{I I}, Cu ^{I, I I}, Zn ^{I I}\).
The variability of oxidation states, a characteristic of transition elements, arises out of incomplete filling of d-orbitals in such a way that their oxidation states differ from each other by unity, e.g. \(V ^{I I}, V^{I I I}, V^{I V}, V^V\). This is in contrast with the variability of oxidation states of non transition elements where oxidation states normally differ by a unit of two.
An interesting feature in the variability of oxidation states of the d-block elements is noticed among the groups (groups 4 through 10). Although in the p-block, the lower oxidation states are favoured by the heavier members (due to inert pair effect), the opposite is true in the groups of dblock. For example, in group 6, \(Mo ( VI )\) and \(W ( VI )\) are found to be more stable than \(Cr ( VI )\). The \(Cr ( VI )\) in the form of dichromate in acidic medium is a strong oxidising agent, whereas \(MoO _3\) and \(WO _3\) are not.
Low oxidation states are found when a complex compound has ligands capable of \(\pi\)-acceptor character in addition to the \(\sigma\)-bonding. For example, in \(Ni ( CO )_4\) and \(Fe ( CO )_5\), the oxidation state of nickel and iron is zero.
Most acidic species among the following is :

___________ solution of phenol in water acts as a disinfectant.

A binary ideal solution of AB type has :

Arrange the following stages of primary succession in water in correct sequence.
A. Rooted submerged plants
B. Marsh meadows
C. Phytoplanktons
D. Scrubs followed by trees
E. Free floating plants
Choose the correct answer from the options given below:

Ravi's speed of rowing in still water is 6 km/hr
The speed of the stream is 3 km/hr
He rows between two points in a river and returns to the same point
He took 30 minutes more to cover the distance upstream than downstream
Find the distance between the two points

Match List I with List II

List I	List ll
(A) alpha-1-antitrypsin	(I) Resistant to insect attacks
(B) Transgenic mice	(II) Genetically engineered insulin
(C) Eli Lily	(III) Testing safety of polio vaccine
(D) Bt crops	(IV) Treating Emphysema

Choose the correct answer from the options given below: