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- Question
Earlist thermometerr was developed by
Options- A. Celsius
- B. Fahrenheit
- C. Kelvin
- D. Galileo
- Correct Answer
- Galileo
- 1. Lux is the SI unit of
Options- A. luminous flux
- B. luminous efficiency
- C. intensity of illumination
- D. luminous intensity Discuss
- 2. Electrostatic precipitator is used to control
Options- A. Water pollution
- B. Noise pollution
- C. Air pollution
- D. Solid waste Discuss
- 3. Rate at which velocity changes over time?
Options- A. Speed
- B. Displacement
- C. Acceleration
- D. Jerk Discuss
- 4. The wavelike properties of electrons are useful in
Options- A. Magnifying objects
- B. Lasers
- C. Weather reports
- D. All of the above Discuss
- 5. The colour of a thin film is due to
Options- A. Scattering
- B. Dispersion
- C. Diffraction
- D. Interference Discuss
- 6. SI unit of temperature is
Options- A. Kelvin
- B. Celsius
- C. Fahrenheit
- D. Joule Discuss
- 7. 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
- 8. 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
- 9. A body given with an initial velocity moved under the effect of gravity is called? Discuss
- 10. When a steel ball is placed on the surface of mercury, it does not sink because
Options- A. of the surface tension of mercury
- B. mercury is a semisolid
- C. of the high viscosity of mercury
- D. the density of mercury is greater than that of steel Discuss
Physics problems
Search Results
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: Air pollution
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: 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
Correct Answer: Projectile
Correct Answer: the density of mercury is greater than that of steel
Explanation:
A solid sinks in a liquid if its density is greater than that of the liquid. if less, it floats
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