Physics-Objective Related Question Answers
526. The electronic circuit which works only on two voltage levels (0 and 1) is called?
Gates
527. Voltage levels in a circuit is either represented by?
'1' or '0'
528. The level '1' represents?
High voltage level
529. The level '0' represents?
Zero voltage level
530. Wireless radio communication was developed by?
Guglielmo Marconi
531. First telecommunication device was?
Telegraph
532. The frequencies transmitted by TV station is called?
Channel
533. For radio transmission BBC uses?
Short waves
534. Short waves ranging from 14mto 60m are used for?
International communication
535. The waves which travel long distances without loss in intensity?
Short waves (14m to 60m)
536. Electro magnetic spectrum between 30MHzand 300 MHz is called?
VHF
537. VHF is used in?
Radio Transmission and Radar
538. Frequency ranging from 300 MHZ to 3 GHz is called?
VHF
539. Full form of Telex is?
Teleprinter Exchange
540. The device used for communicating the text and images through telephone lines?
Fax machine
541. The device used to convert audio frequency signals into sound?
Loudspeaker
542. The instrument which has ability to convert sound into magnetic energy?
Tape recorder
543. The phenomenon of attraction of a substance by a magnet is called?
Magnetism
544. A naturally occurring magnet?
Lodestone
545. Magnetism was first discovered in?
Lodestone
546. Every magnet has two poles, they are?
A North pole and a South pole
547. Like poles of a magnet …. and unlike poles……?
repel; attract
548. The field around a magnet where its magnetic effect is felt?
Magnetic field.
549. Permanent magnet is made up of?
Alnico
550. Electromagnet is made up of?
Pure Iron
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