An ordinary mobile phone communicates by using:
- (A) Sound waves
- (B) Micro waves
- (C) Radio waves
- (D) Ultra violet waves
- (C) Radio waves
A ‘Drone’ can be traced by:
- (A) Radar
- (B) Laser
- (C) Sound waves
- (D) Radio waves
- (A) Radar
Light travels at the rate of about _______ miles per second.
- (A) 1,75,000
- (B) 1,86,282
- (C) 1,90.000
- (D) 1,99,999
- (B) 1,86,282
What does ‘FM’ stand for?
- (A) Frequency Module
- (B) Frequency Movement
- (C) Frequency Modulation
- (D) Frequency Megahertz
- (C) Frequency Modulation
A radar which detects the presence of an enemy aircraft uses:
- (A) Sound waves
- (B) Radio waves
- (C) Electric waves
- (D) Ultrasonic waves
- (B) Radio waves
Which of the following metals is used in aircrafts?
- (A) Radium
- (B) Titanium
- (C) Palladium
- (D) Chromium
- (C) Palladium
The solar energy produced by:
- (A) Fusion reaction
- (B) Fission reaction
- (C) Combustion reaction
- (D) Adverse reaction
- (A) Fusion reaction
The speed of sound is _______ the speed of light.
- (A) Greater than
- (B) Equal to
- (C) Less than
- (D) One tenth of
- (C) Less than
Speed of sound in moist air is _______ speed of sound in dry air.
- (A) Less than
- (B) Same as
- (C) More than
- (D) Data insufficient
- (C) More than
Sounds cannot travel through:
- (A) Gases
- (B) Vacuum
- (C) Liquids
- (D) Solids
- (B) Vacuum