Wave Optics — Physics STD 12 Science — Question

On rubbing, when one body gets positively charged and other negatively charged, the electrons transferred from positively charged body to negatively charged body are:

An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii of the wires are in the ratio of 4/3 and 2/3, then the ratio of the currents passing through the wire will be(a) 3 (b) 1/3(c) 8/9(d) 2

In the above question, the resistance between the square faces is

In optical instruments, the lenses are used to form images by:

Dynamo is a device for converting(a) Electrical energy into mechanical energy(b) Mechanical energy into electrical energy(c) Chemical energy into mechanical energy(d) Mechanical energy into chemical energy

The antiparticle of electron is:

Biaxial crystal among the following is (a) Calcite(b) Quartz(c) Selenite(d) Tourmaline

Young’s double slit experiment is performed with light of wavelength 550 nm. The separation between the slits is 1.10 mm and screen is placed at distance of 1 m. What is the distance between the consecutive bright or dark fringes (a) 1.5 mm(b) 1.0 mm(c) 0.5 mm(d) None of these