Sunday, October 25, 2020

Which waves are used by Ordinary mobile phone to communicate?

A. Radio waves
B. Electrical Waves
C. UV Waves
D. Sound Waves

Show Answer
A. Radio waves

The Unit for measuring electric current is

A. Kelvin
B. Candela
C. Ampere
D. None of them

Show Answer
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

Show Answer
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

Show Answer
A. lumen/watt

OLED stands for:

A. Inorganic LED
B. Organic LED
C. Organic light emitting diode
D. None of these

Show Answer
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

Show Answer
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

Show Answer
A. 1.43 eV
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