A. Radio waves
B. Electrical Waves
C. UV Waves
D. Sound Waves
A. Radio waves
Which waves are used by Ordinary mobile phone to communicate?
The Unit for measuring electric current is
A. Kelvin
B. Candela
C. Ampere
D. None of them
C. Ampere
Light waves can be polarized because they?
A. are Transverse waves
B. can be reflected
C. Have short wavelength
D. None of these
A. are Transverse waves
What is the unit of luminous efficiency of electric bulb?
A. lumen/watt
B. lux
C. Watt
D. None of these
A. lumen/watt
OLED stands for:
A. Inorganic LED
B. Organic LED
C. Organic light emitting diode
D. None of these
C. Organic light emitting diode
Silicon is an elemental semiconductor and known as:
A. Indirect band gap material
B. Direct
C. Both a and b
D. None of these
A. Indirect band gap material
The energy gap value of gas is
A. 1.43 eV
B. 2.5 eV
C. 3.42 eV
D. None of these
A. 1.43 eV