81) Color T.V Utilizes primary color
Ans) Red, green and blue
82) The soap bubbles in sunlight appear having brilliant color due to?
Ans) Interference of the light
83) The presbyopia affected the person uses?
Ans) Bifocal lens of suitable focal length
84) The effective diameter of the lens or mirror is called?
Ans) Aperture
85) The kerosene oil spread on the water surface appears in descent colors?
Ans) Due to Interference of the light
86) The seas appear blue due to?
Ans) The scattering of light
87) A phot-electric cell converts?
Ans) Light energy to electrical energy
88) For which the diode is used?
Ans) Purification
89) In electronics what comes under tank circuit?
Ans) Capacity and inductance
90) Mica is?
Ans) A bad conductor of electricity and a good conductor of heat
91) Germanium, silicon, selenium etc are?
Ans) Semi-Conductor
92) The voltaic cell was invented by professor?
Ans) Alessandro Volta
93) If a long solenoid be bent round in the form of a ring then is called?
Ans) Toroid
94) When a vehicle passes, TV reception gets distorted. This is because?
Ans) Spark plug creates electromagnetic disturbances
95) A transformer works with?
Ans) Alternating current only
96) A transformer is used?
Ans) To decrease or increase AC voltage
97) The nature of fuse wire is?
Ans) High resistance and low melting point
98) A multimeter is used to measure?
Ans) Current, voltage, and resistance
99) Which circuit element is used to block DC in an electronic circuit?
Ans) Capacitor
100) The transformer works on the principle of? ( Basic Science questions)
Ans) Mutual induction
