In a diffraction experiment, the screen is placed \( D = 2 \text{ m} \) away from a narrow slit. The first minimum observed is at \( x = 5 \text{ mm} \) on either side of the central maximum for wavelength of \( \lambda = 5 \times 10^{-5} \text{ cm} \). The width of the slit a is:

Pair-production means :

Match List-I with List-II

List-I	List-II
(A) Radiowaves	(I) Point contact aerials
(B) Microwaves	(II) Ionization chamber
(C) Infrared rays	(III) Receivers aerial
(D) X-rays	(IV) Bolometer

Choose the correct answer from the options given below :

The transverse nature of light is shown by

In a circuit where current 3I enters at A, with semicircular sections ABC and ADC of equal radii r, resistances 2R and R respectively, the magnetic field at the center is :

Interference fringes may be observed due to the superposition of two light waves represented by :

You are given a transformer that has 800 turns on its primary coil and 64 turns on its secondary coil. A voltage of 220 V is applied to the primary coil. What is the output voltage?

Area bounded by the curve \(y=\log x, x\)-axis, \(x=1\) and \(x=2\) in square units is:

The chromosomal theory of inheritance was proposed by:

Biolistics or gene gun method of transferring the gene of interest into host organism is suitable for:

Monochromatic lights of wavelengths 620 nm and 626 nm, respectively are used to study diffraction at a single slit of aperture 0.7 mm. The distance between the slit and the screen is 1.8 m. The separation between the positions of the first maxima of the diffraction pattern obtained in the two cases is

Read the passage carefully and answer the questions
Optically active polyhydroxy aldehydes or ketones or molecules which provide such units on hydrolysis are called carbohydrates. They can be broadly classified as monosaccharides, disaccharides and polysaccharides depending on their behavior towards hydrolysis. They are also classified as reducing or non-reducing sugars. Another class of biomolecules is proteins which are polymers of twenty different amino acids linked by peptide bonds. Amino acids can be classified as acidic, basic or neutral depending on the relative number of amino and carboxyl groups in their molecule. The essential amino acids cannot be synthesized by our body and hence must be provided through diet. Nucleic acids are the polymers of nucleotides which in turn consist of a base, pentose sugar and phosphate. There are two types of
nucleic acids namely, DNA and RNA which differ in the composition of sugar and a base
Which of the following is non-reducing sugar?

On doubling the initial concentration, the half life of a reaction becomes half. The order of the reaction is