(A) X-rays
(B) Gamma rays
(C) Ultraviolet rays
(D) Radio rays
The answer is: (D) Radio rays
Tag: electromagnetism mcqs
Air is a very good ________ of heat.
(A) conductor
(B) insulator
(C) radiator
(D) evaporator
The answer is: (B) insulator
The refrigerator works on the two processes
(A) condensation and convection
(B) convection and radiation
(C) radiation and evaporation
(D) condensation and evaporation
The answer is: (D) condensation and evaporation
Evaporation is a ________ process.
(A) condensation
(B) Liquefying
(C) cooling
(D) convection
The answer is: (C) cooling
At high altitude the air temperature is lower as compare to sea level, therefore water boils at ________ temperature.
(A) lower
(B) higher
(C) constant
(D) absolute
The answer is: (A) lower
The melting point of ice is lowered by a/an ________ in pressure.
(A) increase
(B) decrease
(C) change
(D) consistency
The answer is: (A) increase
The presence of impurities ________ the freezing point of water.
(A) increases
(B) decreases
(C) accelerate
(D) do not have any effect on
The answer is: (B) decreases
The boiling point of alcohol is
(A) 71 °C
(B) 75 °C
(C) 79 °C
(D) 83 °C
The answer is: (C) 79 °C
If we add salt to the pure water, its boiling point will
(A) increase
(B) decrease
(C) remain same
(D) none of these
The answer is: (A) increase
An instrument used to measure gas pressure is called
(A) ammeter
(B) barometer
(C) galvanometer
(D) manometer
The answer is: (D) manometer