Electrostatics — Physics STD 12 Science — Question

What will be the angle of diffracting for the first minimum due to Fraunhoffer diffraction with sources of light of wave length 550 nm and slit of width 0.55 mm (a) 0.001 rad(b) 0.01 rad(c) 1 rad  (d) 0.1 rad

It is easier to start  a car engine on a hot day than on a cold day. This is because the internal resistance of the car battery(a) Decreases with rise in temperature(b) Increases with rise in temperature(c) Decreases with a fall in temperature(d) Does not change with a change in temperature

The image which can not be taken on the screen is called:

The mutual inductance between two coils is 1.25 henry. If the current in the primary changes at the rate of 80 ampere/second, then the induced e.m.f. in the secondary is(a)  12.5 V(b) 64.0 V(c)  0.016 V(d) 100.0 V

In a cyclotron, a charged particle.

Assertion :   The threshold frequency of photoelectric effect supports the particle nature of sunlight.
Reason      : If frequency of incident light is less than the threshold frequency, electrons are not emitted from metal surface.(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.

In Young's double slit experiment, the distance between the slits is 1 mm and that between slit and screen is 1 meter and 10th fringe is 5 mm away from the central bright fringe, then wavelength of light used will be (a) 5000 Å(b) 6000 Å(c) 7000 Å(d) 8000 Å

The direction of propagation of electromagnetic wave is :