Physics problems
- 1. Lux is the SI unit of
Options- A. luminous flux
- B. luminous efficiency
- C. intensity of illumination
- D. luminous intensity Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO, Database Administrator, IT Trainer
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.
- 2. Earlist thermometerr was developed by
Options- A. Celsius
- B. Fahrenheit
- C. Kelvin
- D. Galileo Discuss
Correct Answer: Galileo
- 3. SI unit of temperature is
Options- A. Kelvin
- B. Celsius
- C. Fahrenheit
- D. Joule Discuss
Correct Answer: Kelvin
- 4. 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
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.
- 5. 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
Correct Answer: Centrifugal Force
- 6. A body given with an initial velocity moved under the effect of gravity is called? Discuss
Correct Answer: Projectile
- 7. 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
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
- 8. 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
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.
- 9. 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
Correct Answer: K.E of random motion of molecules
- 10. Two bulbs are fitted in a room in the domestic electric installation. One of them glows brighter than the other. Then
Options- A. the brighter bulb has smaller resistance
- B. the brighter bulb has larger resistance
- C. both the bulbs have the same resistance
- D. none of these Discuss
Correct Answer: the brighter bulb has smaller resistance
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