Moving Charges and Magnetism — Physics STD 12 Science — Question

The dielectric constant k of an insulator cannot be(a) 3 (b) 6(c) 8  (d) ∞   

Phase difference between voltage across the ends of an inductor coil and capacitor in radians is:

The dimensions of polarisation are:

Diffraction effects are easier to notice in the case of sound waves than in the case of light waves because(a) Sound waves are longitudinal(b) Sound is perceived by the ear(c) Sound waves are mechanical waves(d) Sound waves are of longer wavelength

The displacement of a particle in simple harmonic motion in one time period is:

1. A
2. 2A
3. 4A
4. zero.

Inside a hollow charged spherical conductor, the potential (a) Is constant(b) Varies directly as the distance from the centre(c) Varies inversely as the distance from the centre(d) Varies inversely as the square of the distance from the centre

Which gates is represented by this figure

Wave nature of light follows because(a) Light rays travel in a straight line(b) Light exhibits the phenomena of reflection and refraction(c) Light exhibits the phenomenon of interference(d) Light causes the phenomenon of photoelectric effect

A 20F capacitor is charged to 5V and isolated. It is then connected in parallel with an uncharged 30F capacitor. The decrease in the energy of the system will be(a) 25 J(b) 200 J(c) 125 J  (d) 150 J

In a transformer 220 ac voltage is increased to 2200 volts. If the number of turns in the secondary are 2000, then the number of turns in the primary will be