(A) electrons
(B) protons
(C) neutrons
(D) none of these
The answer is: (A) electrons
Tag: physics mcqs
The wire used to make heating elements in electric kettles and irons are made of
(A) nichrome
(B) chromel
(C) tungsten
(D) fire-clay
The answer is: (A) nichrome
The wire used to make the filament of a light bulb is made of
(A) nichrome
(B) chromel
(C) tungsten
(D) fire-clay
The answer is: (C) tungsten
The speed of sound will be maximum if passing through
(A) vacuum
(B) air
(C) water
(D) iron
The answer is: (D) iron
Which rays are useful in cancer treatment?
(A) X-rays
(B) Gamma rays
(C) Ultraviolet rays
(D) Radio rays
The answer is: (B) Gamma rays
Which radiation has the lowest frequency in the electromagnetic spectrum?
(A) X-rays
(B) Gamma rays
(C) Ultraviolet rays
(D) Radio rays
The answer is: (D) Radio rays
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