Two concentric circular loops of radius 5 cm and 15 cm are placed co-axially. Find e.m.f induced in the inner loop, if the current through the outer loop is changed at a rate of 10 A/ms. Assume the magnetic field on the inner loop to be uniform.

Heavy water and __________ is one of the substance used as moderator in reactors.

The current in a circuit having constant resistance is tripled. The power dissipation will become :

Choose the correct relation between focal length f and radius of curvature R of a convex mirror from the following:

Identify the correct statement(s) among the following:
(A) If three electrical cells each of emf, E and internal resistance r are connected in series to a resistance R, the current drawn from them is 3E/(R+3r).
(B) If these three cells are connected in parallel combination, across resistance R then the current drawn will be E/(3R+r).
(C) If the two cells are connected in series and then one in parallel which are then connected across resistance R, then the current drawn will be 2E/(2R+2r).
(D) In a mixed grouping of cells, current will be maximum when total external resistance is equal to total equivalent internal resistance.
Choose the correct answer from the options given below :

A bullet of mass 40 g is traveling at a speed of 1.0 km/s. Its de-Broglie wavelength would be

White light is used to illuminate the two slits in a Young's double slit experiment. The separation between the slits is b and the screen is at a distance D from the slits. At a point on a screen directly in front of one of the slits, certain wavelength are missing. Some of these wavelengths are :
(A) \( \lambda = \frac{b^2}{D} \)
(B) \( \lambda = \frac{2b^2}{D} \)
(C) \( \lambda = \frac{b^2}{3D} \)
(D) \( \lambda = \frac{2b^2}{3D} \)
Choose the correct answer from the options given below :

Arrange the given stages involved in embryo development in a dicot angiosperm in correct sequence
(A) Globular embryo
(B) Proembryo
(C) Zygote
(D) Heart shaped embryo
Choose the correct answer from the options given below:

Two coherent light beams of intensity 2I and 18I are superposed with each other. The maximum and minimum possible intensities in the resulting beam are

Which type of interaction is shown by the marine fish and copepods:

Which of the following is the highest species-rich taxonomic group among animals?

Match List-I with List-II

List-I (Electromagnetic Waves)	List-II (Production)
(A) Radio waves	(I) Vibration of atoms and molecules
(B) X-rays	(II) originates from an atomic nucleus
(C) \( \gamma \)-radiation	(III) produced by accelerating electrons in a circuit
(D) infrared waves	(IV) emitted from heavy atoms

Choose the correct answer from the options given below:

Unpolarised light is incident on a medium at an angle of incidence \( 60^{\circ} \). The reflected ray is perpendicular to the refracted ray. Refractive index (\( \mu \)) of the medium is: