Electromagnetic Waves — Physics STD 12 Science — Question

Assertion  :   An aircraft flies along the meridian, the potential at the ends of its wings will be the same.
Reason     : Whenever there is change in the magnetic flux e.m.f. induces.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.

Which is not an electrostatic phenomenon:

Copper has face centered cubic (fcc) lattice with interatomic spacing equal to 2.54Å. The value of the lattice constant for this lattice is (a) 1.27 Å(b) 5.08 Å(c) 2.54 Å   (d) 3.59 Å

A parallel beam of light is incident on a converging lens parallel to its principal axis. As one moves away from the lens on the other side on its principal axis, the intensity of light:

If convex lens of focal length 80cm and a concave lens of focal length 50 cm are combined together, what will be their resulting power (a) + 6.5 D (b) – 6.5 D(c) + 7.5 D(d) – 0.75 D

The image formed by objective lens of a compound microscope is :

The critical angle between an equilateral prism and air is 45°. If the incident ray is perpendicular to the refracting surface, then(a) After deviation it will emerge from the second refracting surface(b) It is totally reflected on the second surface and emerges out perpendicularly from third surface in air(c) It is totally reflected from the second and third refracting surfaces and finally emerges out from the first surface(d) It is totally reflected from all the three sides of prism and never emerges out