Current Electricity — Physics STD 12 Science — Question

The image which can be obtained on a screen is called:

Which of the following statements is incorrect about hysteresis(a) This effect is common to all ferromagnetic substances(b) The hysteresis loop area is proportional to the thermal energy developed per unit volume of the material(c) The hysteresis loop area is independent of the thermal energy developed per unit volume of the material(d) The shape of the hysteresis loop is characteristic of the material

The percentage of Sun's total energy which reaches the earth's surface is

Electric potential of earth is taken to be zero because earth is a good(a) Insulator(b) Conductor(c) Semiconductor(d) Dielectric

Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

Which of the following phenomena establishes the particle nature of light ?

The total power content of an AM wave is 900 W. For 100% modulation, the power transmitted by each side band is (a) 50 W(b) 100 W(c) 150 W(d) 200 W

The magnetic susceptibility is

A small circular coil of radius 1cm and number of turns 100 is placed inside a long solenoid of radius 5cm and number of turns 8per cm. The axis of the coil is parallel to the solenoid axis. Then, the coefficient of mutual inductance of the two coils is (in milli Henry).

If the half life of a radioactive sample is 10 hours, its mean life is(a) 14.4 hours(b) 7.2 hours(c) 20 hours(d) 6.93 hours