The ratio of the radius of the third orbit to that of the second orbit in a hydrogen atom is

If the height of the TV tower is increased by 21%, then by what percentage will the transmission range of the tower be affected ?

The magnifying power of a telescope is 6 in normal adjustment. The distance between its two lenses is 35 cm. The focal lengths of objective and eye-piece are, respectively:

If potential difference V applied across a metallic wire is increased by V, how will the drift velocity of the electrons change?

An electromagnetic wave travels in a medium at a speed of \( 2 \times 10^8 \text{ m/s} \). If the relative permeability (\( \mu_r \)) of the medium is 1.0, then the relative permittivity (\( \varepsilon_r \)) of the medium is equal to

If the speeds of gamma rays, X-rays and microwaves are \( V_g \), \( V_x \) and \( V_m \), respectively in free space, then the correct relation between them is:

If the wavelength of light in an experiment on photoelectric effect is increased, then
(A) the photoelectric emissions will not take place
(B) the photoelectric emission may or may not take place
(C) the stopping potential will increase.
(D) the stopping potential will decrease
Choose the correct answer from the options given below:

Let \(A X=B\) be a system of three linear equations in three variables. Then the system has
(A) a unique solutions if \(|A|=0\)
(B) a unique solutions if \(|A| \neq 0\)
(C) no solutions if \(|A|=0\) and \((\operatorname{adj} A ) B \neq 0\)
(D) infinitely many solutions if \(|A|=0\) and \((\operatorname{adj} A ) B =0\)
Choose the correct answer from the options given below:

The production of beta-galactosidase by the lac operon is started when:

Arrange the following steps \(( A , B , C\) and D \()\) in proper sequence to determine the index correction in the given arrangement.

(A) The difference between the two gives the correction to be applied to the observed distance.
(B) The positions of the uprights are read on the scale. Their difference gives the observed distance between tip of the pin and the pole of the mirror.
(C) A thin straight index needle OP is placed so that its one end O touches the tip of the pin and the other end P touches the pole of the mirror.
(D) Length of the needle OP is measured by placing it on the scale which is the actual distance between the points in question.
Choose the correct answer from the options given below:

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.
Which of the following vitamin cannot be stored in our body?

The value of parameter k for which the function \(f(x)=1+k x, k \neq 0\) is the inverse of itself is:

In the majority of flowering plants, a certain pattern is followed in megaspore mother cell (MMC) undergoing meiosis and producing megaspores. How many functional megaspores would be produced with 32 MMC?