Physics-Objective Related Question Answers
451. Conductivity is inversely proportional to?
Resistance
452. Unit of conductivity is?
Siemens
453. The metal having lowest resistance?
Silver
454. The instrument used to control the resistance?
Rheostat
455. Nichrome is used as heating element in many appliances because of?
High resistivity
456. Super conductivity was discovered by?
Kamerlingh Onnes
457. At very low temperature, super conductivity possesses?
Zero resistance
458. A super conductor above 100 K?
Ceramics
459. Fuseis used to avoid?
Overloading of current in electric circuit
460. Fuse is made from an alloy of?
Lead and Tin
461. Fuse has?
low melting point and high resistivity
462. When a charged body is connected to the earth it 'gets neutralised. It is called?
Earthing
463. Colour of positive wire in domestic circuits is?
Red/Brown
464. Colour of Neutral wire in domestic circuits is?
Black/Blue
465. Colour of earth wire in domestic circuits is?
Green
466. A number of cells connected together are called?
Battery
467. A source of emf containing two or more cells is called?
A battery
468. Rechargeable batteries like mobile phones, torches uses?
Nickel and Cadmium
469. The negative electrode in a dry cell is?
Cathode eg: zinc
470. The positive electrode in a dry cell is?
Anode eg: carbon rod
471. Cell was first invented by?
Alessandro Volta
472. Cell is otherwise known as?
Voltaic Cell
473. Dry cell was invented by?
Carl Gassner
474. In primary cell, chemical energy is converted into?
Electrical energy eg : Daniel cell; Dry cell etc
475. Potential difference measured in volt is called?
Voltage
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