31.  Which atmospheric Layer is used for the transmission of radio waves?

Answer & Explanation
Ionosphere

32.  A body in uniform motion with uniform speed-

Answer & Explanation
May have uniform velocity

33.  According to special theory of relativity the mass of a particle -

Answer & Explanation
Increases with increase in velocity

34.  Humidity is measured by -

Answer & Explanation
Hygrometer

35.  Ball pen act on the principle of -

Answer & Explanation
Gravitation

36.  Flywheel is an important part of a steam engine because

Answer & Explanation
helps the engine in keeping speed uniform.

37.  The spoon dropped by an astronaut in a satellite will

Answer & Explanation
Continue to flow the motion of satellite

38.  Anemometer is used to measure-

Answer & Explanation
Speed of wind

39.  Lubricant oil is used in vehicle to -

Answer & Explanation
to decrease the friction

40.  Mechanical energy is countered into electrical energy

Answer & Explanation
Microphone

41.  Who discovered X-Rays?

Answer & Explanation
Roentgen

42.  A TV channel characterized by -

Answer & Explanation
Frequency of transmitted signal

43.  The process by which sunlight reaches to earth--..

Answer & Explanation
Radiation

44.  X-rays are ----------.. waves.

Answer & Explanation
Electromagnetic

45.  The danger signals are red while the eye is more sensitive to yellow because.

Answer & Explanation
The danger signals are red while the eye is more sensitive to yellow because.