Q.41)-When a vehicle passes, TV reception gets distorted. This is because
- Metal reflects radiowaves
- Spark plug creats electromagnetic disturbances
- Vehicle pollution affects the performance of the TV components
- Modern vehicles use electro-ignition system
Q.42)-Where are mesons found?
- Cosmic rays
- X-rays
- Gamma rays
- Laser beam
Q.43)-What is the full form of 'AM' regarding radio broadcasting?
- Amplitude Movement
- Anywhere Movement
- Amplitude Matching
- Amplitude Modulation
Q.44)-The scientist who first sent electromagnetic waves to distant places is
- James Clerk Maxwell
- Heinrich Hertz
- Thomas Alva Edison
- John Logie Baired
Q.45)-The audio signals of TV are
- Amplitude modulated
- Frequency modulated
- Unmodulated
- Velocity modulated
Q.46)-Tape recorder should not be kept near one of the following things:
- Clock
- Magnet
- Electrical switchboard
- Radio
Q.47)-Night photography and photography in mist and fog are possible using
- Ultraviolet Radiation
- Infra-red Radiation
- Microwave Radiation
- Gamma Radiation
Q.48)-Forged documents are detected by
- Ultraviolet rays
- Infra-red rays
- Beta rays
- Gamma rays
Q.49)-In the remote control of television, electromagnetic waves used are
- Ultraviolet
- Microwave
- Radiowave
- Infrared
Q.50)-Which of the following waves has the highest frequency?
- Radio
- Infrared
- Microwaves
- Gamma Rays