p-n junction when reversed biased acts as a_______________?

A. Capacitor
B. Inductor
C. On switch
D. Off switch

The minimum wavelength of X-rays can further be reduced by _______________?

A. Reducing the pressure or cooling the target
B. Increasing the temperature of the filament.
C. Using a target element of higher atomic number
D. Increasing the potential difference between the cathode and the target

The characteristic X-rays spectrum is due to_____________?

A. The illumination of the target metal by ultra-violet radiation
B. The bombardment of the target by protons
C. The bombardment of target by electrons
D. The absorption of radiation by the target metal

Quality of X-rays depends upon ____________ A-filament current B-accelerating voltage C-material of the target ?

A. A & b
B. B & c
C. A & c
D. A b & c

In an X-ray tube electrons each of charge e are accelerated through V potential difference allowed to hit a metal target. The wavelength of the X-rays emitted is_______________?

A. He/ev
B. He/vc
C. Ev/h
D. Impossible to predict

Radiation produced from TV picture tube is_____________?

A. B-rays
B. X-rays
C. Far infrared
D. Infrared

X-ray are________________?

A. Of unknown nature
B. High energy electrons
C. High energy photons
D. Radio isotopes

Total number of series in hydrogen spectrum is_____________?

A. Three
B. Four
C. Five
D. Six

The radiations emitted form hydrogen filled discharge tube show____________?

A. Band spectrum
B. Line spectrum
C. Continuous spectrum
D. Absorption spectrum

Photon of highest frequency will be absorbed when transition takes place from_____________?

A. 1st to 5th orbit
B. 2nd to 5th orbit
C. 3rd to 5th orbit
D. 4th to 5th orbit