#1 Albert Einstein was awarded Nobel Prize for his path-breaking research and formulation of the:
#2 Which one of the following types of Laser is used in Laser Printers?
#3 The power of a lens is measured in :
#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:
#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?
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?
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?
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.