Question 1.
During hot weather, the fan produces a feeling of comfort. This is because
A. Fan supplies cool air
B. Fan cools the air
C. Our perspiration eva-porates rapidly
D. Conductivity of air increases
Ans: C. Our perspiration eva-porates rapidly
Question 2.
Heat flows as a result of difference of __
A. Temperature
B. Density
C. Mass
D. Volume
Ans: A. Temperature
Question 3.
Who measured the velocity of light first ?
A. Galileo
B. Newton
C. Romer
D. Einstein
Ans: C. Romer
Question 4.
Which is an example of Phototropism?
A. Roots of a plant following water
B. Plant bending toward the light
C. Roots growing into the soil
D. A venus flytrap capturing a fly
Ans: B. Plant bending toward the light
Question 5.
The flow of thermal energy is called
A. Heat
B. Current
C. Voltage
D. Potential
Ans: A. Heat
Question 6.
Light beam which is highly directional is called:
A. Eraser
B. Grazer
C. Maser
D. Laser
Ans: D. Laser
Question 7.
Light houses are places with powerful lights to :
A. Guide and resolve traffic jams in crowded metro-cities during nights
B. Guide and help large crowds at religious gathering during nights
C. Indicate to the incoming warships, the location of a harbour during night
D. Guide and warn the ships coming from different directions in the ocean
Ans: D. Guide and warn the ships coming from different directions in the ocean
Question 8.
Light travels fastest in
A. Air
B. Water
C. Glass
D. Diamond
Ans: A. Air
Question 9.
On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :
A. Metals have higher thermal capacity than plastics
B. Plastics have a lower density than metals
C. Metals are good conductors of heat
D. Plastics have a higher thermal conductivity than metals
Ans: C. Metals are good conductors of heat
Question 10.
Speed of light is maximum in __
A. Vacuum
B. Solids
C. Liquids
D. Gases
Ans: A. Vacuum
Question 11.
It is dangerous to observe Solar eclipse with naked eyes because
A. Infrared radiations from sun burn our retina
B. Ultraviolet radiations from Sun burn our retina
C. All radiations from sun initiate chemical reactions in eyes
D. Cosmic rays reach eyes more during the eclipse
Ans: B. Ultraviolet radiations from Sun burn our retina
Question 12.
Light travels slowest in
A. Glass
B. Water
C. Air
D. Vacuum
Ans: A. Glass
Question 13.
Which of the following is an insulator?
A. Mercury
B. Carbon
C. Germanium
D. Glass
Ans: D. Glass
Question 14.
Light travels in a straight line (rectilinear propagation of light). This statement does hold if the medium of travel for light is
A. Of variable refractive index
B. Made up of slabs of different refractive indices
C. Homogeneous and transparent
D. Inhomogeneous and transparent
Ans: C. Homogeneous and transparent
Question 15.
Formation of shadows can be explained by
A. Rectilinear propagation of light
B. Reflection
C. Refraction
D. Total internal reflection
Ans: A. Rectilinear propagation of light
Question 16.
Light from the sun reaches us in nearly
A. 5 min
B. 4.30 hrs
C. 8 min
D. 5.30 hrs
Ans: C. 8 min
Question 17.
‘Therm’ is the unit of
A. Power
B. Heat
C. Light
D. Distance
Ans: B. Heat
Question 18.
The speed of light will be minimum while passing through
A. Water
B. Vaccum
C. Air
D. Glass
Ans: D. Glass
Question 19.
The locomotion of insects to the source of light is called :
A. Phototropic
B. Hydrotropic
C. Phototactic
D. Thermotactic
Ans: A. Phototropic
Question 20.
An image formed by a plane mirror, that cannot be obtained on a screen is called __
A. Virtual image
B. Real image
C. Inverted image
D. Erect image
Ans: A. Virtual image
Physics GK MCQs all set
- Physics MCQs Set-1
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