Physics-Objective Related Question Answers
1051. Which instrument converts electrical energy into mechanical energy?
Electric motor
1052. What is the unit used to measure electro motive force?
Volt
1053. Which is the commercial unit of electric power?
k.w.h
1054. Which instrument converts sound into electricity?
Microphone
1055. Which battery is used in vehicles?
Storage battery
1056. Tangent galvanometer measures?
Current
1057. The best instrument for the accurate measurement of the EMF of a cell is?
Potentiometer
1058. The resistance of an ideal volt meter is?
Infinite
1059. Short circuit means?
Direct flow of current between points of the same potentials
1060. Best conductor of electricity is?
Silver
1061. The principle on which a quartz crystal in a watch works?
Piezoelectricity
1062. The thickness of certain ceramics changes when a voltage is applied across them this property is called?
Piezoelectricity
1063. A small piece of wire made from an alloy of lead and tin is used to avoid overloading is?
Fuse
1064. Nichrome is used in the manufacture of heating elements due to its?
High resistance
1065. Device which converts mechanical energy into electrical energy?
Dynamo; It works on the principle of electro magnetic induction
1066. Diode valves can be used as?
A rectifier
1067. A device which can store considerable amount of charge is called?
Condenser or capacitor
1068. The battery used in mobile phone?
Lithium ion battery
1069. Which cell is used in watch?
Button cell (mercury cell)
1070. Which is the weakest kind of bonding in solids?
Vander Waal’s
1071. In good conductors of electricity, which type of bonding exists?
Metallic
1072. The conductivity of a intrinsic semi conductor at absolute zero is?
Zero
1073. A transformer is used?
increase or decrease A.C. voltage
1074. Any material that allows the passage of electricity and heat is called?
Conductor
1075. In artificial satellites, electric current is supplied by?
Solar cells
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