Identify the correct statements among the following.
(A) The wavefront for a point source of light is in a spherical shape, rays are all radial from the point source,
(B) All the points on a cylindrical wavefront vibrate in the same phase,
(C) A set of straight lines perpendicular to a wavefront are called rays of light. Light energy does not flow along these lines.
(D) Every point of a given wavefront acts as a fresh source of a secondary wavelet
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When the angle of incidence on a material is \(60^{\circ}\), the reflected light is completely polarised. The velocity of the refracted ray inside the material in cm/s is :

Three charges, each equal to +q, are placed at the corners of an equilateral triangle ABC of side 'a' as shown in the figure. P and R are the mid-points of BC and CA. The work done in taking a charge Q from point P to R is:

A capacitor charged from a 100 V d.c supply is found to have charge of 20 \(\mu\text{C}\). How much energy is stored in it ?

Which of the following statements are correct ?
A. The saturation current is constant with collector plate potential for different frequencies of incident radiation.
B. The saturation current is different with collector plate potential for different frequencies of incident radiation.
C. The saturation current is different with collector plate potential for different intensity of incident radiation.
D. The saturation current is constant with collector plate potential for different intensity of incident radiation.
E. Below threshold frequency no photo electrons are emitted.
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The current in a circuit having constant resistance is tripled. The power dissipation will become :

Two spheres of silver of same radii, one solid and the other hollow are charged to the same potential, then :

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

Which one of the given assisted reproductive technologies (ART) involves transfer of fertilized egg into the fallopian tube?

A man rows a boat such that it covers a distance upstream in twice the time taken by him to cover the same distance downstream. If the speed of stream is 5 km/h, the speed of boat in still water is:

For any vector \(\vec{a}\), the value of \(|\vec{a} \times \hat{i}|^2+|\vec{a} \times \hat{j}|^2+|\vec{a} \times \hat{k}|^2\) is equal to :

Read the passage below and answer the question:
The accumulation of molecular species at the surface rather than in the bulk of a solid or liquid is termed as adsorption. There are two types of adsorption. In physisorption, attractive forces are mainly Van der Waals while in chemical adsorption adsorbate is held with chemical bonds adsorbent. Adsorption increases with increase in pressure and decreases as temperature is increased.
Which of the following is not characteristic of chemical adsorption?

Match List I with List II.

LIST I	LIST II
A. Penicillium notatum	I. Ethanol
B. Trichoderma polysporum	II. Citric acid
C. Saccharomyces cerevisiae	III. Antibiotics
D. Aspergillus niger.	IV. Cyclosporin A

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