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GK - EDS > (CAR) Physics > Flashcards

(CAR) Physics Flashcards

1
Q

What are primrary colours

A

Colours which cannot be produced.
(Primary colors include red, blue and yellow. Primary colors cannot be mixed from other colors. They are the source of all other colors)

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2
Q

Air bubble in water shines coz of the phenomenon of

A

Total Internal Reflection
(the phenomenon which occurs when a propagated wave strikes a medium boundary at an angle larger than a particular critical angle with respect to the normal to the surface.)

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3
Q

The advantage of AC over DC is that

A

It can be transmitted over long distances with minimum power loss

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4
Q

What minimum escape velocity required for a rocket to be launched in space

A

11 km per sec

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5
Q

____ device is used to step up or step down the voltage of alternating current

A

Transformer

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6
Q

The spherical shape of a small drop of rain is due to

A

Surface Tension

The cohesive forces between liquid molecules are responsible for the phenomenon known as surface tension.

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7
Q

The blue colour of the sky can be attributed to

A

Differential scattering of sunlight by the atmosphere

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8
Q

____ colour has the longest wavelength

A

Red

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9
Q

_____ mirror can be used to focus sunliight

A

Concave Mirror

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10
Q

_____ is a good conductor of electricity

A

Graphite

Conductors conduct electrical current very easily because of their free electrons.

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11
Q

On ____ principles the tape recorder funtions

A

Electromagnetic Induction

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12
Q

When a constant force is applied to a body it moves with uniform

A

Velocity

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13
Q

The silvered surface of thermoflask prevents transfer of heat by

A

Radiation

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14
Q

Tube light works on the principle of

A

Discharge of electric through gases

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15
Q

In a refrigerator, cooling is produced by

A

The evaporation of volatile liquid

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16
Q

Air is removed from an electric bulb to prevent

A

Oxidation of tungsten filament

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17
Q

On earth a moving body comes to rest by itself coz of the

A

Forces of Friction
(Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other)

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18
Q

An electric motor is used to convert

A

Mechanical energy into electrical energy

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19
Q

Energy of a body due to its motion is called

A 
Kinetic Energy
(he kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity)
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20
Q

The energy stored in stretched spring is

A

Elastic Potential Energy

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21
Q

In cells Chemical energy is transformed into

A

Electrical Energy

22
Q

When a body is dropped from a certain height, the gravitaional potential energy is converted into

A

Kinetic Energy

23
Q

Human body converts chemical potential energy of food into

A

Heat Energy

24
Q

Electromechanical energy is required for the working of

A

Nervous system

25
Q

the energy stored in fossils fuel is

A

Chemical Energy

26
Q

Semi-Conductors ?

A

A substance whose ability to conduct current lies in b/w conductors and insulators

27
Q

The temperature inside lighted bulb is around 2700 degree C, the filament does not burn because

A

The oxygen necessary for combustion (and burning) is not available, as the bulb is evacuated and filled with pure nitrogen or inert gases

28
Q

A remote control gadget has in it

A

A small transmitter that emits infrared signals

29
Q

Lightning is formed when

A

Strong opposite charges in different clouds breakdown the resistance offered by the intervening air

30
Q

A semi conductor is also known as

A

Rectifier

31
Q

The wave which do not require any medium is

A

electromagnetic waves

32
Q

Radio Waves are

A

Electromagnetic Waves
( Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field. In other words, EM waves are composed of oscillating magnetic and electric fields.)

33
Q

AC voltage is

A

Analogue Quantity

34
Q

The device which converts analogue signal to digital signanl is called

A

Modem

35
Q

For making laser, we usually use

A

Ruby

36
Q

Argon laser is used for operating the

A

Glaucoma

37
Q

When light enters from rate to denser medium, it bends towards the normal line, it is called

A

Refraction of light

38
Q

Electormagnetic waves travel with the

A

Speed of light

39
Q

Sound travel faster in

A

Iron than in Air
(Sound thus travels faster (about 4 times as fast) in hydrogen than in air. Although the density of air is much less than that of iron, the elasticity of iron is very much greater than that of air. Sound thus travels faster (about 14 times as fast) in iron than in air.)

40
Q

A polaroid is

A

a device used for analysing polarized light

41
Q

Rayleigh Scattering?

A

the scattering of light by particles in a medium, without change in wavelength

42
Q

The phenomenon of land and sea breeze is as a result of

A

Convection

43
Q

The flow of heat from a hot to a cold body is an example of

A

Isothermal Process

44
Q

______ makes the air coming out of a puntured tyre cool.

A

Adiabatic expansion

Adiabatic expansion against pressure, or a spring, causes a drop in temperature

45
Q

It takes much longer to cook things on the hills than on the plains, coz

A

Atmospheric pressure is lower and water boils at a lower temperature.

46
Q

The working of optical fibres is based on teh _____ of electromagnetic waves

A

Total internal Reflection

47
Q

The needle of a magnetic compass

A

Aligns itself parallel to a magnetic field

48
Q

Condenser is used

A

To collect the charge

49
Q

____ instrument is used to measure A.C

A

Hot Wire Ammeter

50
Q

Permanent magnets are made from

A

Ferromagnetic substances

51
Q

Electronics is the study of

A

Flow of molecules

52
Q

Errect and virtual images are always poduced by

A

Plane and Convex mirrors

GK - EDS (19 decks)

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