Laws of heating are given by
(a) Bohar
(b) Lenz
(c) Maxwell
(d) Faraday
Answer:
At a grid sub stations the voltage is stepped up to reduce loss of
(a) Power
(b) Resistance
(c) Current
(d) Electrical energy
Answer:
Which one of the following is used in storage batteries?
(a) Zinc
(b) Tin
(c) Copper
(d) Lead
Answer:
The forth state of matter is known as
(a) Electrons
(b) Plasma
(c) Gas
(d) Vapour
Answer:
A diode can be used for
(a) Detection
(b) Rectification
(c) Amplification
(d) Modulation
Answer:
The positive charge carriers in semiconductor are
(a) Positrons
(b) Holes
(c) Positive ions
(d) Protons
Answer:
A typical example of a semiconductor is
(a) quartz
(b) Mica
(c) Platinum
(d) Germinium
Answer:
Which of the following is not a semiconductor
(a) Arsenic
(b) Germinium
(c) Silicon
(d) All of these
Answer:
Long distance short-wave radio broad-casting uses
(a) Sky wave
(b) Direct wave
(c) Ionospheric wave
(d) ground wave
Answer:
A keyboard is this kind of device
(a) Output
(b) Black
(c) Word Processing
(d) Input
Answer: