General Science - Physics MCQs
1. Albert Einstein was awarded Nobel Prize for his path-breaking research and formulation of the:
[A] Theory of Relavitity
[B] Laws of Photo-Electric Effect
[C] Principle of Wave-Particle Duality
[D] Theory of Critical Opalescence
Show Answer
Correct Answer: B [Laws of Photo-Electric Effect]
2. Which one of the following types of Laser is used in Laser Printers?
[A] Semiconductor laser
[B] Excimer Laser
[C] Dye Laser
[D] Gas Laser
Show Answer
Correct Answer: A [Semiconductor laser]
3. The power of a lens is measured in :
[A] diopters
[B] aeon
[C] lumen
[D] candela
Show Answer
Correct Answer: A [diopters]
4. The television technology in which a new form of light-emitting crystals which can be printed onto flexible plastic sheets to produce a paper-thin display that can be rolled up and carried in a pocket is:
[A] QD-TV
[B] SED-TV
[C] Pixel Plus
[D] Slingbox
Show Answer
Correct Answer: A [QD-TV]
5. Crystals of which of the following naturally-occuring substance exhibits both ‘pyroelectric’ and ‘piezoelectric’ properties making it versatile for application in the field of electronics?
[A] Quartz
[B] Mica
[C] Topaz
[D] grapite
Show Answer
Correct Answer: A [Quartz]
Notes:
Quartz crystals have piezoelectric properties: they develop an electric potential upon the application of mechanical stress. An early use of this property of quartz crystals was in phonograph pickups. A common piezoelectric use of quartz today is as a crystal oscillator. The quartz clock is a familiar device using the mineral. Quartz is also strongly pyroelectric. Temperature changes create positive and negative charges within the crystal.
6. Which of the following statements is not true regarding LASER?
[A] A LASER is a device that emits light through a process of optical amplification .
[B] LASER beams can be focused to very tiny spots, achieving a very high irradiance.
[C] The emitted LASER light is notable for its high degree of dispersive power unattainable using other technologies.
[D] LASER light is used in bar-code scanners
Show Answer
Correct Answer: C [The emitted LASER light is notable for its high degree of dispersive power unattainable using other technologies.]
Notes:
The emitted laser light is notable for its high degree of spatial and temporal coherence, unattainable using other technologies.
7. If a moving body turns its speed to 1.5 times, what will be the impact on its kinetic energy?
[A] will become 1.5 times
[B] will become 3 times
[C] will become 2.25 times
[D] will become 6 times
Show Answer
Correct Answer: C [will become 2.25 times]
Notes:
Kinetic Energy is a product of half the Mass times Velocity Squared. When the velocity is doubled, the Kinetic energy would go up four times. If velocity is tripled, kinetic energy would go up nine times. If velocity is increased by 1.5 times the Kinetic energy would go up by 1.5×1.5=2.25 times.
8. Two Flat mirrors are placed at an angle of 60° from each other. How many images will be formed of a Candle placed in between them?
[A] 3
[B] 4
[C] 5
[D] 6
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9. A tourist, who plans to visit a hill station located at very high altitude also wishes to take along his Television Set. In this context, consider the following:
- LCD TV
- Plasma TV
- Cathode Ray Tube TV
Which among the above are expected to work properly at very high altitudes?
[A] Only 1
[B] 1 & 2
[C] 1 & 3
[D] 2 & 3
Show Answer
Correct Answer: C [1 & 3]
10. If an egg with shell is placed in a microwave oven, which among the following would most likely happen?
[A] The egg will not get warmed
[B] The egg will get cooked slowly similar to a boiled egg
[C] The egg shell will explode
[D] The egg shell becomes yellow
Show Answer
Correct Answer: C [The egg shell will explode]
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