At upper atmosphere, an astronaut feels
(a) Extremely cool
(b) Slightly cooler
(c) Slightly hoter
(d) Extremely hot
Answer:
Thermal radiations are electromagnetic wave belonging to
(a) Gamma region
(b) Infrared region
(c) Ultraviolet
(d) Visible region
Answer:
The change of a solid into vapour directly is called
(a) Melting
(b) Sublimation
(c) Vaporization
(d) Freezing
Answer:
The primary colours in photography are
(a) red, blue, green
(b) red, green, cyan
(c) red, bue, yelow
(d) red, yellow, green
Answer:
The resistance of an ideal ammeter is
(a) Very high
(b) very low
(c) zero
(d) infinite
Answer:
The electrolyte in the dry cel is
(a) Ammonium chloride
(b) Magnese dioxide
(c) Acid of sulpher
(d) Zinc
Answer:
A switch is alaways connected to the
(a) Line wire
(b) Earth wire
(c) Neutral wire
(d) None of these
Answer:
Good condutors have many losely bound
(a) Electrons
(b) Atoms
(c) Neutrons
(d) Protons
Answer:
The unit of electrical power is
(a) Ampere
(b) Kilowatt hour
(c) Volt
(d) Watt
Answer:
Conversion of chemical energy into electrical energy occure in
(a) Battery
(b) Dynamo
(c) Electric heaters
(d) Atomic bombs
Answer: