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Question Detail
Who discovered Diode Bulb ?
- Henry Becquerel
- Sir J.S. Fleming
- Lee De Forest
- Archemedes
Answer: Option B
Explanation:
Sir J.S. Fleming discovered Diode Bulb in 1904,
Lee De Forest discovered Triode Bulb in 1906,
Archemedes discovered laws of floatation in 1827,
Henry Becquerel discovered Radioactivity in 1896.
1. Which instrument is used to determine the intensity of colours ?
- Cathetometer
- Chronometer
- Colorimeter
- Commutator
Answer: Option C
Explanation:
Cathetometer - is used to determine heights,
Chronometer - is used to longitude of a vessel at sea,
Commutator - is used to convert AC to DC.
2. Which law states, "The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings."
- Doppler's Effect
- Newton's law of cooling
- Kirchhoff's Law
- Stefan's Law
Answer: Option B
Explanation:
Doppler's Effect - The Doppler effect can be described as the effect produced by a moving source of waves in which there is an apparent upward shift in frequency for observers towards whom the source is approaching and an apparent downward shift in frequency for observers from whom the source is receding.
Kirchhoff's Law - Kirchhoff's Law signifies that good absorbers are good emitters.
Stefan's Law - The radiant energy emitted by a black body per unit area per unit time is directly proportional to the fourth power of its absolute temperature.
3. The force which opposes the relative motion between different layers of liquid or gases is called
- Critical Velocity
- Streamline Flow
- Terminal Velocity
- Viscous Force
Answer: Option D
Explanation:
Critical Velocity - The maximum velocity upto which fluid motion is streamline is called Critical Velocity.
Streamline Flow - If velocity of all fluid particles is same all the time then it can be said in streamline flow.
Terminal Velocity - When a body falls in viscous medium, its velocity first increases and finally becomes constant. The constant velocity is called terminal velocity.
4. Which instrument is used to measure altitudes in aircraft's ?
- Audiometer
- Ammeter
- Altimeter
- Anemometer
Answer: Option C
Explanation:
Ammeter - Measures strength of electric current.
Audiometer - Measures intensity of sound.
Anemometer - Measures force and velocity of wind and directions.
5. Which instrument is used to record physical happenings at a distant place ?
- Thermostat
- Tonometer
- Telemeter
- Transponder
Answer: Option C
Explanation:
Thermostat - is used to regulate the temperature at a particular point.
Tonometer - is used to measure the pitch of a sound,
Transponder - is used to receive a signal and transmit a reply immediately.
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