If a p-n junction is forward biased, then what is the direction of diffusion and drift current across the junction?

Match List - I with List - II.

List - I	List - II
(A) Metals	(I) Elements/compounds
(B) Pure semiconductors	(II) Extrinsic semiconductor
(C) Doped semiconductor	(III) Low resistivity
(D) Semiconductors	(IV) Intrinsic semiconductors

Choose the correct answer from the options given below:

An object is placed at 5 cm in front of a concave mirror with a radius of curvature of 20 cm. The distance of the image from mirror and its nature are

If light of wavelength 412.5 nm is incident on each of the metals given below, which ones will show photoelectric emission ?

Metal	Work Function (eV)
Na	1.92
K	2.15
Ca	3.20
Mo	4.17

Choose the correct answer from the options given below:

A double slits is illuminated by light of wavelength 600 nm. The slits are 0.1 cm apart and the screen is placed 1 m away. The width of maxima is:

Identify the incorrect statement.
(A) Power meters work on the principle of Eddy currents.
(B) Induction furnace uses eddy currents to produce heat.
(C) Eddy currents can be used to produce braking force in moving trains.
(D) Eddy currents are produced in a steady magnetic field.
Choose the correct answer from the options given below :

From the given statements:
A. All photons in white light have same energy and momentum
B. When intensity of light increases the number of photons incident per second per unit area increases.
C. Photons are deflected by negative terminal of battery
D. Photoelectric (saturation) current increases with increase in the frequency of radiation
Choose the correct answer from the options given below:

\(H_3 C-CH_2-CH_2-CH_2-CH=CH_2 \xrightarrow{HBr} A\)
A will be

Sap of which plant is fermented to produce 'Toddy' in southern India ?

Read the passage carefully and answer the following questions
Aldehydes, carboxylic acids and ketones are widespread in the animal and plant kingdoms. They play a pivotal role in various biochemical processes of life. Their presence in nature adds fragrance and flavor. These compounds are widely used in food products, pharmaceuticals, paints, resins and other important product industries. These compounds are prepared by various laboratory methods, which mainly include oxidation, formylation, acylation and reduction. Due to the polar nature of the carbonyl group in aldehydes and ketones, they can exhibit different reactions like nucleophilic addition. They do exhibit redox and various condensation reactions which lead to the formation of various important compounds. On the other hand, the carboxylic acids are mainly prepared by oxidation and hydrolysis of different compounds. The carboxylic acid consists of a carbonyl group and the hydroxy group (attached to the carbonyl carbon atom). This makes it possible for the carboxylic acid to participate in various chemical reactions which involve cleavage of the \(C - OH\) bond and the O-H bond along with the reactions involving the complete - COOH group.
Which of the following compounds will give butanone on oxidation with chromic anhydride (CrO3)?

Match List I with List II

LIST I	LIST II
A. Furacine	I. Non-narcotic
B. Antihistamines	II. Artificial Sweetener
C. Alitame	III. Antiseptics
D. Aspirin	IV. Terfenadine

Choose the correct answer from the options given below:

Read the passage carefully and answer
The crystal field theory (CFT) is an electrostatic model which considers the metal-ligand bond to be ionic arising purely from electrostatic interactions between the metal ion and the ligand. Ligands are treated as point charges in case of anions or dipoles in case of neutral molecules. The five d orbitals in an isolated gaseous metal atom/ion have same energy, i.e., they are degenerate. This degeneracy is maintained if a spherically symmetrical field of negative charges surrounds the metal atom/ion. However, when this negative field is due to ligands (either anions or the negative ends of dipolar molecules like NH3 and H2O) in a complex, it becomes asymmetrical and the degeneracy of the d orbitals is lifted. It results in splitting of the d orbitals. The pattern of splitting depends upon the nature of the crystal field.
In tetrahedral coordination complexes, low-spin configurations are rare because:

A radioactive sample has \(4.0 \times 10^{18}\) active nuclei at a certain instant. How many of these nuclei will still be in the same active state after three half lives ?