SSC JE 2017 18 || General Science || Important for All Branches || Physics Questions Capsule || Part 4

Scientific Instruments:

•Converts mechanical energy into electrical energy- Dynamo

•Compares intensity of colors- Colorimeter

•Measures the frequency of electromagnetic waves- Ondometer

•To see objects above sea level- Periscope

•To determine rotational speed of shafts- Tachometer

Waves

•Mechanical Waves:

•Longitudinal Waves

•Transverse Waves

•Non-Mechanical waves or Electromagnetic waves:

1.Short radio waves or Hertzian Waves- H. Hertz

2.Long Radio Waves- Marconi

3.Infra-red rays- Hershel

4.Visible radiation- Newton

Doppler’s Effect:

•The Doppler effect (or the Doppler shift) is the change in frequency or wavelength of a wave for an observer who is moving relative to the wave source.

•Applications of Doppler’s Effect

•To measure the velocities of planets.

•Overspeeding of vehicles.

•To guide the aircraft.

Which one of the following has the highest frequency?

Cosmic rays

X-rays

Radiowaves

Microwaves

Structure of solids is investigated by using?

Gamma rays

X-rays

Cosmic rays

Infrared rays

SONAR is based on the principle of?

•Resonance

•Reverberations

•Echo

•None of the above

Which of the following electromagnetic waves can be detected using Point-contact diodes?

 1) Ultraviolet rays 2) Microwaves 3) Infra-red waves 4) Radio waves 

A magnetron valve is used to produce __________.

1) Radio waves 2) X-Rays 3) Gamma rays 4) Microwaves 

The electromagnetic effect is produced by? 

• Chargeless particle •A static charge •A moving charge •An acceleration charge 

Which of the following has the longest wavelength? 

•Infrared rays •Gamma rays • Light rays •Ultraviolet rays

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