Top 1000+ Solved Physics MCQ Questions Answer
Q. 'Kilowatt-hour' is the unit of -
a. potential difference
b. electric power
c. electric energy
d. electric potential
Q. If the temperature inside a room is increased, the relative humidity will ?
a. increase
b. decrease
c. remain unchanged
d. none of these
Q. The device used to change the speed of an electric fan is -
a. Amplifier
b. Regulator
c. Switclh
d. Rectifier
Q. The required DC voltage for arc welding is-
a. 6 to 9 V
b. 50 to 60 V
c. 200 to 250 V
d. 90 to 100 V
Q. A wire carrying current is –
a. positively charged
b. negatively charged
c. neutral
d. charged with a type depending upon current strength
Q. A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pairsuffers.
a. reflection
b. refraction
c. diffraction
d. total internal reflection
Q. Which of the following physical quantities has no dimension?
a. Force
b. Momentum
c. Impulse
d. Angle
Q. Which of the following is a good conductor of heat but bad conductor of electricity?
a. mica
b. asbestos
c. celluloid
d. paraffin wax
Q. Respiration in the absence of air is called -
a. Aerobic respiration
b. Anaerobic respiration
c. Muscular respiration
d. Molecular respiration
Q. Which one among the following is responsible for formation of "Ozone Holes" in the atmosphere?
a. Benzopyrene
b. Hydrocarbons
c. Chlorofluorocarbons
d. UV radiation
Q. An alloy is an example of :
a. Colloidal solution
b. Emulsion
c. Solid solution
d. Heterogeneous mixture
Q. The resistance of a conductor is inversely proportional to its -
a. temperature
b. resistivity
c. area of cross section
d. length