The reflected and the refracted rays are perpendicular to each other when light is incident on a transparent denser medium having refractive index \( \mu = \sqrt{3} \). The angle of incidence is

The electric field vector oscillates according to the equation \( \vec{E} = 4 \sin [1.8y + (5.4 \times 10^8)t] \hat{k} \). The equation of magnetic field vector is:

Resistances in two gaps of a metre bridge are 8\( \Omega \) and 24\( \Omega \) , respectively. The distance by which the balance point shifts by interchanging the resistances in the two gaps, is

An electron is accelerated through a potential difference of \( V = 36 \text{ V} \). The de-Broglie wavelength associated with it will be

The forbidden energy band gap in conductors, semi conductors and insulators are \( E_{G1}, E_{G2} \) and \( E_{G3} \), respectively. The relation among them is

When light travels from one medium to another, then its

Three resistances of magnitude \(2 \Omega\), \(3 \Omega\) and \(5 \Omega\) are connected in parallel to a battery of 10 V and of negligible resistance. The potential difference across \(3 \Omega\) resistance will be:

Read the passage carefully and give the answers to the question :
India was amongst the first countries in the world to initiate action plans and programmes at a national level to attain total reproductive health as a social goal.
These programmes called 'family planning' were initiated in 1951 and were periodically assessed over the past decades. Improved programmes covering wider reproduction-related areas are currently in operation. Creating awareness among the people about various reproduction-related aspects and providing facilities and support for building up a reproductively healthy society are the major tasks under these programmes.
Match Column I with Column II

Column I	Column II
(A) ZIFT	(I) Sperm injected into ovum
(B) ICSI	(II) Embryo in uterus
(C) IUI	(III) Embryo in fallopian tube
(D) IUT	(IV) Semen in uterus

Choose the correct answer from the options given below

Which of the following statements are correct about alkyl halides :
A. Alkyl halides are polar so they are soluble in water
B. RX on reaction with alc.KOH give alkenes
C. RX on reaction with \(AgNO_2\) give RONO
D. \(S_N1\) proceeds with inversion in configuration
E. R-X have higher boiling point than parent alkanes
Choose the correct answer from the options given below :

A current of \(1.0\) mA is flowing through a potentiometer wire of length 4 m and of resistance \( 40 \, \Omega \). The potential gradient of the potentiometer wire will be :

Answer the question on the basis of passage given below:
Proteins are the polymers of about twenty different a-amino acids which are linked by peptide bonds. Proteins perform various structural and dynamic functions in the organisms. Proteins which contain only a-amino acids are called simple proteins. The secondary or tertiary structure of proteins get disturbed on change of pH or temperature and they are not able to perform their functions. This is called denaturation of proteins. Enzymes are biocatalysts which speed up the reactions in biosystems. Vitamins are accessory food factors required in the diet. They are classified as fat soluble (A, D, E and K) and water soluble (B group and C). Deficiency of vitamins leads to many diseases. Nucleic acids are the polymers of nucleotides which in turn consist of a base, a pentose sugar and phosphate moiety.Nucleic acids are responsible for the transfer of characters from parents to offsprings. There are two types of nucleic acids DNA and RNA. DNA contains a five carbon sugar molecule called 2-deoxyribose whereas RNA contains ribose.
During denaturation of proteins:

The role of ethidium bromide in gel electrophoresis is:

The exaggerated response of the immune system to certain antigens present in the environment is known as: