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- Question
Electrostatic precipitator is used to control
Options- A. Water pollution
- B. Noise pollution
- C. Air pollution
- D. Solid waste
- Correct Answer
- Air pollution
- 1. Rate at which velocity changes over time?
Options- A. Speed
- B. Displacement
- C. Acceleration
- D. Jerk Discuss
- 2. The wavelike properties of electrons are useful in
Options- A. Magnifying objects
- B. Lasers
- C. Weather reports
- D. All of the above Discuss
- 3. The colour of a thin film is due to
Options- A. Scattering
- B. Dispersion
- C. Diffraction
- D. Interference Discuss
- 4. Sound becomes hazardous noise pollution at decibels?
Options- A. above 120 db
- B. above 80 db
- C. above 50 db
- D. above 30 db Discuss
- 5. In a vacuum, all electromagnetic waves have the same
Options- A. Velocity
- B. Wavelenth
- C. Frequency
- D. All the above Discuss
- 6. Lux is the SI unit of
Options- A. luminous flux
- B. luminous efficiency
- C. intensity of illumination
- D. luminous intensity Discuss
- 7. Earlist thermometerr was developed by
Options- A. Celsius
- B. Fahrenheit
- C. Kelvin
- D. Galileo Discuss
- 8. SI unit of temperature is
Options- A. Kelvin
- B. Celsius
- C. Fahrenheit
- D. Joule Discuss
- 9. A nuclear reactor is said to have become 'critical' when
Options- A. it stops due to malfunctioning
- B. it starts emitting dangerous radioactive radiations
- C. it is shut down to avoid explosion
- D. it is ready to produce controlled energy Discuss
- 10. Fat can be seperated from milk in a cream seperator because of :
Options- A. Cohesive Force
- B. Gravitational Force
- C. Centripetal Force
- D. Centrifugal Force Discuss
Physics problems
Search Results
Correct Answer: Acceleration
Explanation:
Acceleration is nothing but the rate at which velocity changes over time.
Correct Answer: Magnifying objects
Explanation:
The photoelectric effect pointed to the particle properties of light, which had been considered to be a wave phenomenon. Particles like electron and protons have both particle like and wave like behavior. Thus, according to de Broglie, all the material particles in motion possess wave characteristics. Although the dual nature of matter is applicable to all material objects but it is significant for microscopic bodies only.
Correct Answer: Interference
Explanation:
In physics, interference is a phenomenon in which two waves superpose to form a resultant wave of greater, lower, or the same amplitude. The color bands in thin films are a result of wavelength dependent interference caused by the close spacing of the surfaces of the film.
Correct Answer: above 120 db
Explanation:
Sound intensity is measured in decibels(db). Sound pollution above 120 db becomes more hazardous and have adverse affects on human life.
Correct Answer: Velocity
Explanation:
When traveling in a vacuum, electronic waves from the electromagnetic spectrum all travel at the same speed. Velocity is speed with direction, so they would all travel at the same velocity, realtively speaking. But frequency and wavelength are quite different.
Correct Answer: intensity of illumination
Explanation:
The lux (lx) is the SI derived unit of illuminance and luminous emittance, measuring luminous flux per unit area. It is equal to one lumen per square meter.
Correct Answer: Galileo
Correct Answer: Kelvin
Correct Answer: it is ready to produce controlled energy
Explanation:
To produce controlled energy i.e energy at a controlled or steady rate, the number of fissions per second must be controlled and maintained at that rate. Excess neutrons should be absorbed by control roads like cadmium.
Correct Answer: Centrifugal Force
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