Physics gk

PHYSICS GK MARUTHUPANDI M INDIAN –TN-MDU

16.Ohm‘s law is a relationship between a) voltage, current, and time b) power, current, and resistance c) resistance, time, and current d) voltage, current, and resistance

Ohm's law 

the current through a conductor between two points is directly proportional to the voltage across the two points

I α V V α I

Ohm's law 

Born: 16 March 1789, Died : 6 July 1854 (aged 65)

Nationality: German

Field: Physics (Electricity)

17. What is the resistor value in the given circuit?a) 200 Ω b) 1 k Ω c) 2k Ω d) 4k Ω

Resistance value

18. Who discovered the neutron?

a) J.J. Thomsonb) Ernest Rutherford

c) James Chadwickd) Albert Einstein

Neutron

Sir Joseph John Thomson

18 December 1856 – 30 August 1940 English Physicist and Nobel laureate in physics discovery and identification of the electron

Ernest Rutherford

Born: 30 August 1871, Died : 19 October 1937 (aged 66)

Nationality: New Zealander

Field: Physics and Chemistry

James Chadwick

Born: 20 October 1891,

Died : 24 July 1974 (aged 82)

Nationality: British

Field: Physics and Chemistry

Albert Einstein Born: 14 March 1879 , Died:18 April 1955 (aged 76) Residence (Citizenship ): Germany, Italy, Switzerland,

Austria ,Belgium, United States Field: Physics, philosophy

19. RADAR is used for

a) locating submerged submarines

b) receiving a signals in a radio receiver

c) locating geostationary satellites

d) detecting and locating the position of objects such as aeroplanes

RADAR

Acronym for RAdio Detection And Ranging Radar is an object-detection system that uses 

radio waves to determine the range, angle, or velocity of objects

It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations

RADAR

Long-range radar antenna, used to track space objects and ballistic missiles

RADAR Radar of the type used for detection of aircraft. It rotates steadily,

sweeping the airspace with a narrow beam

20. Of the following properties of a wave, the one that is independent of the other is its

a) amplitudeb) velocityc) wavelength

d) frequency

WAVE

a wave is an oscillation accompanied by a transfer of energy that travels through a medium

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