Dual Nature of Radiation and Matter — Physics STD 12 Science — Question

If a full wave rectifier circuit is operating from 50 Hz mains, the fundamental frequency in the ripple will be

(a) 50 Hz

(b) 70.7 Hz

(c) 100 Hz

(d) 25 Hz

Electric charge is measured in:

A moving charge produces :

In photoelectric effect if the intensity of light is doubled then maximum kinetic energy of photoelectrons will become

(a) Double

(b) Half

(c) Four time

(d) No change

How much energy in kilowatt hour is consumed in operating ten 50 watt bulbs for 10 hours per day in a month (30 days).

(a) 1500

(b) 5,000

(c) 15

(d) 150

The magnifying power of an astronomical telescope in the position of normal adjustment is given by :

An electroscope is used:

The sun revolves around the galaxy with a speed of 250 km/sec and it's radius is 3 × 10⁴ light year. The mass of the milky way is

(a) 3 × 1040 kg

(b) 3 × 1041 kg

(c) 5  × 1040 kg

(d) 6 × 1041 kg

When two deuterium nuclei fuse together to form a tritium nuclei, we get a

(a) Neutron

(b) Deutron

(c) α - particle

(d) Proton

In R - L - C series circuit, the potential differences across each element is 20V. Now the value of the resistance alone is doubled, then P.D. across R, L and C respectively.