Physics Quiz 1 ( SSC, Railway)

29/9/19


1. Desert Coolers: 
when unsaturated air comes in contact with water, the water evaporates._moisture content of air increases, while its temperature decreases. _moist air is used for providing cooling.

{Desert coolers make use of evaporative cooling}





2. Ultrasonic waves~ frequency greater than 20,000Hz 



3. ‘Farad’ is the unit of: Capacitance.


Viscosity - Poise

Surface tension-  Newton/metre

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6.7.19

1. By which one of the following, an old written material which cannot be read easily, can be read?

X-rays

>wavelength ranging from 0.01 to 10 nanometers




**2. A barometer is kept inside a bell jar. Air is slowly pumped out of the jar.

Mercury level starts rising.


{As the pump removes the air from the bell jar the pressure reduces around the barometer. >>The reduction in pressure around the barometer leads it to expand.}

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22.6.19

1. Escape velocity of the moon is?
2.4 km/s




2. Sun appears red in colour at sunrise and sunset due to
all other colours scatter away except Red




3. Clouds do not precipitate in deserts because of low humidity in the weather of deserts. 

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13.7.19

1. Good resistance coils are made of _____?
Manganin
 86% copper, 12% manganese and 2% nickel



2.  Application of the doppler's effect?

{Doppler effect_ change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source.} 

Applications:
>Police check overspeeding of cars.
>To study the heart and blood flow.
>At airports to guide aircraft.
>To measure the velocity of planets and stars.
>Used in some type of RADARs.



3. Vehicles mirror_ objects in mirror are closer than they appear
Convex mirror



4. Which one of the following reflects back more sunlight as compared to other three?
>Land covered with fresh snow 


Albedo~fraction of solar energy (shortwave radiation) reflected from the Earth back into space

>Fresh snow or ice: 60-90% or 80-95%; 
>Desert sand: 30-50%;





5. Temperature of distant luminous bodies can be determined by
Pyrometer 

{a type of remote-sensing thermometer used to measure the temperature of a surface}


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