Atoms — Physics STD 12 Science — Question

Assuming that universe is expanding, if the spectrum of light coming from a star which is going away from earth is tested, then in the wavelength of light(a) There will be no change(b) The spectrum will move to infrared region(c) The spectrum will seems to shift to ultraviolet side(d) None of the above

Bohr’s atom model is the modification of Rutherford’s atom model by the application of:

One conducting sphere has 50e charge and the other identical sphere has + 20e charge. If both the sphere are touched and separated, then the charge on each will be:

Which one of the following statement is false:

In Young's experiment, light of wavelength 4000 Å is used to produce bright fringes of width 0.6 mm, at a distance of 2 meters. If the whole apparatus is dipped in a liquid of refractive index 1.5, then fringe width will be(a) 0.2 mm(b) 0.3 mm(c) 0.4 mm(d) 1.2 mm

Approximate height of ozone layer above the ground is(a) 60 to 70 km(b) 59 km to 80 km(c) 70 km to 100 km(d) 100 km to 200 km

An e.m.f. of 12 volts is induced in a given coil when the current in it changes at the rate of 48 amperes per minute. The self inductance of the coil is(a) 0.25 henry(b) 15 henry(c) 1.5 henry(d) 9.6 henry

In Young's double slit experiment, if the widths of the slits are in the ratio 4 : 9, the ratio of the intensity at maxima to the intensity at minima will be(a) 169 : 25(b) 81 : 16(c) 25 : 1 (d) 9 : 4

The reason of current flow in P-N junction in forward bias is(a) Drifting of charge carriers(b) Minority charge carriers(c) Diffusion of charge carriers(d) All of these