डेसीबल किसे मापने के लिए प्रयोग में लाया जाता है?
Decibel is used to measure:
Comprehensive collection of questions from General Science asked in recent state service examinations. Each question is verified with official answer keys and step-by-step bilingual solutions.
Decibel is used to measure:
Decibel unit is used to measure:
The 'Decibel' unit is used for:
When two people talk normally, how many decibels of sound is produced?
An example of longitudinal waves is-
The velocity of electromagnetic waves is -
Television viewers using dish antennas do not receive satellite signals during rain because: 1. Antennas are small. 2. Rain drops absorb the energy of radio waves. 3. Rain drops scatter the energy of radio waves from their original direction. Which of the above statements are correct?
Which rays are used in CT (Computed Tomography) scanning?
Which one of the following types of waves is used in night vision apparatus?
When ozone is depleted in the stratosphere, what is the wavelength of radiation reaching the Earth's surface?
Long radio waves are reflected back from which layer of the Earth's atmosphere?
Which of the following is used to determine the structure of crystals?
The distance between two successive crests or two successive troughs of a wave is called:
Which of the following is a mechanical wave?
Which of the following statements is NOT correct regarding cosmic rays?
The frequency band used in FM broadcast services is:
Which of the following rays are used in the diagnosis of intestinal diseases?
Wireless communication is reflected back to the Earth's surface by-
Cosmic rays are -
A radar that detects the presence of enemy aircraft uses:
Which of the following is not an example of an electromagnetic wave?
Which of the following layers of the atmosphere is responsible for the deflection/reflection of radio waves?
Microwaves are electromagnetic waves having frequencies in the range of -
Which waves cannot propagate in a vacuum (void)?
Ultra High Frequency (UHF) waves are normally propagated as-