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- Question
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
- Correct Answer
- it is ready to produce controlled energy
ExplanationTo 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.
- 1. SI unit of temperature is
Options- A. Kelvin
- B. Celsius
- C. Fahrenheit
- D. Joule Discuss
- 2. Earlist thermometerr was developed by
Options- A. Celsius
- B. Fahrenheit
- C. Kelvin
- D. Galileo Discuss
- 3. Lux is the SI unit of
Options- A. luminous flux
- B. luminous efficiency
- C. intensity of illumination
- D. luminous intensity Discuss
- 4. Electrostatic precipitator is used to control
Options- A. Water pollution
- B. Noise pollution
- C. Air pollution
- D. Solid waste Discuss
- 5. Rate at which velocity changes over time?
Options- A. Speed
- B. Displacement
- C. Acceleration
- D. Jerk Discuss
- 6. 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
- 7. A body given with an initial velocity moved under the effect of gravity is called? Discuss
- 8. 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
- 9. If a band is played on the moon the sound will
Options- A. reverberate
- B. be heard by us faintly
- C. be heard upto 10 km from it
- D. not be heard at any distance at all from it Discuss
- 10. Heat is associated with
Options- A. K.E of random motion of molecules
- B. K.E of orderly motion of molecules
- C. Total K.E of random and orderly motion of molecules
- D. None of these Discuss
Physics problems
Search Results
Correct Answer: Kelvin
Correct Answer: Galileo
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: 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
Correct Answer: not be heard at any distance at all from it
Explanation:
As there is no atmosphere surrounding the moon, the second from any band that is played there cannot travel outwards there is no material medium surrounding if for its propagation.
Correct Answer: K.E of random motion of molecules
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