Physics General Knowledge Questions: Physics GK Question for Competitive Exams

Q. oil raise up the wick in a lamp. The principle involves

A.the diffusion of oil through the wick
 B.the liquid state of oil
 C.capillary action phenomenon
 D. volatility of oil

Q. Superconductors are substances which

A.conduct electricity at low temperature
 B.offer high resistance to the flow of current
 C.offer no resistance to the flow of electricity
 D.conduct electricity at high temperatures

Q. Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?

A.1.8 km, 0.15 km
 B.2.2 km, 0.20 km
 C.2.8 km, 0.25 km
 D.3.3 km, 0.30 km

Q. Intensity of sound at a point is ____ its distance from the source.

A.directly proportional to
 B.inversely proportional to
 C.directly proportional to square of
 D.inversely proportional to square of

Q. Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit

A.X-rays
 B.ultraviolet light
 C.visible light
 D.radio waves

Q. Out of the following pairs, which one does not have identical dimension?

A.Moment of inertia and moment of a force
 B.Work and Torque
 C.Angular momentum and Planck’s constant
 D.Impulse and Momentum

Q. Mercury is commonly used as a thermometric fluid rather than water because

A.specific heat of mercury is less than water
 B.specific heat of mercury is more than water
 C.mercury has greater visibility than water
 D.density of mercury is more than the water

Q. Optical fibre works on the

A.principle of refraction
 B.total internal reflection
 C.scattering
 D.interference

Q. Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in

A.4.2 seconds
 B.42 seconds
 C.4.2 years
 D.42 years

Q. Light year is a unit of

A.time
 B.distance
 C.light
 D.intensity of light