Electromagnetic Waves — Physics STD 12 Science — Question

If  are the lengths of the emitter, base and collector of a transistor then

(a)

(b)

(c)

(d)

A charged particle moves in a uniform magnetic field. The velocity of the particle at some instant makes an acute angle with the magnetic field. The path of the particle will be:

If two lenses of +5 diopters are mounted at some distance apart, the equivalent power will always be negative if the distance is

(a) Greater than 40 cm	(b) Equal to 40 cm
(c) Equal to 10 cm	(d) Less than 10 cm

Electric switches and appliances should be tested only with:

If the value of C in a series RLC circuit is decreased, the resonant frequency.

If a small amount of antimony is added to germanium crystal:

Six protons and six neutrons are brought together to form a carbon nucleus, but the mass of the carbon nucleus is less than the sum of the masses of the individual particles due to the mass defect, This deducted mass has been:

The dimensional formula of electric field is ___________ .

In the spectrum of light of a luminous heavenly body the wavelength of a spectral line is measured to be 4747 Å while actual wavelength of the line is 4700 Å. The relative velocity of the heavenly body with respect to earth will be (velocity of light is 3 )

(a) 3 moving  towards the earth

(b) 3  moving away from the earth

(c) 3  moving towards the earth

(d) 3  moving away from the earth

Boolean algebra is essentially based on

(a) Truth

(b) Logic

(c) Symbol

(d) Numbers