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Assistant General Science

Physics – 07

പ്രധാനപ്പെട്ട വേവ്സ്, റെയ്‌സ്, റഡാർ, എന്നിവ കൂടാതെ താപവുമായി ബന്ധപ്പെട്ട ചോദ്യങ്ങളുമാണ് ഇന്നത്തെ പാഠത്തിൽ ഉൾപ്പെടുത്തിയിരിക്കുന്നത്.

  • Waves used in point to point fixed telecommunication

Microwaves

 

  • Waves used in Radio and Television communication

Radio waves

 

  • Electromagnetic waves having lowest frequency

Radio waves

 

  • Rays which cause sunburn

Ultraviolet Rays

 

  • LASER stands for

Light Amplification by Stimulated Emission of Radiation

 

  • LASER was discovered by

Theodore Maiman

 

  • Rays used in Medical field for performing minute operations

LASER

 

  • MASER stands for

Microwave Amplification by Stimulated Emission of Radiation

 

  • MASER was discovered by

Charles H Towns

 

  • RADAR stands for

Radio Detection and Ranging

 

  • Device used to detect the position of objects like Aeroplanes, missile etc using Radio Waves

RADAR

 

  • RADAR was detected by

Albert H Taylor and Leo C Young

 

  • Father of long distance Radio transmission

Marconi

 

  • Intensity of sound of Thunderstorm

110 db

 

  • Intensity of sound of Jet Takeoff

130 db

 

  • A disturbance which propagates energy from one place to another without transport of matter

Wave

 

  • Propagation of disturbance at one place by vibration  of particles to all other parts

Wave Motion

 

  • A wave in which particles of medium vibrate in perpendicular to the direction of propagation of wave

Transverse wave

 

  • A wave in which particles of medium vibrate in parallel to the direction of propagation of wave

Longitudinal wave

 

  • The distance between two consecutive particles which are at the same phase of vibration

Wavelength

 

  • No of vibrations in one second

Frequency

 

  • Maximum displacement of a particle from its mean position

Amplitude

 

  • Waves traveling through layers of earth due to Earthquakes, big explosions, volcanic explosions

Seismic Waves

 

  • Scientists dealing with the study of seismic waves

Seismologist

 

  • Transfer of Kinetic Energy from one medium or energy source to another medium is

Heat

 

  • The study of materials and Phenomena at low temperature

Cryogenics

 

  • Form of energy that gives us the sensation of hotness or coldness

Heat

 

  • The degree of hotness or coldness of a body is defined as

Temperature

 

  • Unit other than Joule using to measure Heat

Calorie

 

  • One calorie

4.2 Joules

 

  • The amount of heat required to raise the temperature of 1 gm of water by 1 degree C

One Calorie

 

  • As we go up the atmosphere, the temperature

Decreases

 

  • Color which absorbs more heat

Black

 

  • Device used to detect heat radiation is called

Thermocouple

 

  • The amount of heat required to raise the temperature of unit mass of a substance by 1°C

Specific Heat Capacity

 

  • Substance having highest specific heat capacity

Water (4185 J/KgK)

 

  • Specific heat of water is minimum at

37°C

 

  • Element having highest specific heat capacity

Hydrogen

 

  • Temperature above which a gas cannot be liquefied even in more power is called

Critical temperature

 

  • Temperature at which Ice melts

0°C or 273K or 32°F

 

  • Temperature at which water boils

100°C or 373K or 212°F

 

  • Absolute zero is

-273.15°C or 0K

 

  • Temperature which shows the same temperature in Fahrenheit scale and Celsius scale

-40

 

  • Temperature which shows the same temperature in Fahrenheit scale and Kelvin scale

574.25

 

  • Fraction of volume of ice seen outside when it is immersed in water

10.5%

 

  • Various temperature scales are

Celsius (C), Kelvin (K), Fahrenheit (F), Rankine (Rn)

 

  • Pressure of a gas is reduced to zero at

-273.15°C

 

  • In Fahrenheit scale the interval between ice point and boiling point is divided into

180 equal parts

 

  • To convert Celsius to Fahrenheit

F= (Cx9/5)+32

 

  • To convert Fahrenheit into Celsius

C= (F-32)x5/9

 

  • To convert Celsius to Kelvin scale

K= C+273.15

 

  • To convert Kelvin to Celsius scale

C= K-273.15


(To be Continued…)