Television signals are converted into light by:
- (A) Decoder
- (B) Transistor
- (C) Photo diode
- (D) Optical fiber
- (C) Photo diode
What apparatus is used to locate a submerged object?
- (A) Radar
- (B) Sonar
- (C) Quasar
- (D) Pulsar
- (B) Sonar
A device which records dictation on wax cylinder is:
- (A) Hectometer
- (B) Hypsometer
- (C) Heliscope
- (D) Dictaphone
- (D) Dictaphone
For being able to see three-dimensional pictures, we have to use:
- (A) Binocular
- (B) Camera
- (C) Epidiascope
- (D) Stereoscope
- (C) Epidiascope
Mention the instrument that is used to split light into its spectrum?
- (A) Split meter
- (B) Spectroscope
- (C) Spectrograph
- (D) Spectrometer
- (B) Spectroscope
Which device is used to step up or step down the voltage of alternating current?
- (A) Rectifier
- (B) Galvanometer
- (C) Transformer
- (D) Transistor
- (C) Transformer
For which purpose instrument ‘Centrifuge’ is used?
- (A) To separate liquids
- (B) To separate solids
- (C) To separate mixtures of chemicals
- (D) To separate acidity from water
- (C) To separate mixtures of chemicals
Which instrument is used to measure the pressure of air?
- (A) Galvanometer
- (B) Barometer
- (C) Electrometer
- (D) Speedometer
- (B) Barometer
Why ‘Thermometer’ is used?
- (A) To measure acidity of water
- (B) To measure temperature
- (C) To measure electric current
- (D) To measure coldness
- (B) To measure temperature
‘Richter Scale’ is used for measuring:
- (A) Rainfall
- (B) Wind velocity
- (C) Magnitude of earthquakes
- (D) Water level in the dam
- (C) Magnitude of earthquakes