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GK - EDS > (CAR) Physics 2 > Flashcards

(CAR) Physics 2 Flashcards

1
Q

The Hydraulic brakes used in automobiles is a direct application of

A

Pascal’s Law

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2
Q

Why does the mercury column in the barometer fall rapidly before a severe storm

A

It is due to the fall in atmospheric pressure

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3
Q

The speed of sound is maximum through which of the following

A

Glass

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4
Q

Echo is the effect produced due to

A

Reflection of sound

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5
Q

why are transfomers used in the transmission of electric power?

A

Because they can reduce transmission losses

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6
Q

A mixture of ____ and ____ is used in the manufacture of electric bulbs

A

Oxygen and Argon

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7
Q

Salty water has _____ density

A

Higher

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8
Q

____ is used for detecting and measuring small electric currents

A

Galvanometer

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9
Q

the lightning conductor of rod used for protecting buildings from lightning is made of

A

Copper

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10
Q

What is the melting point of Tungsten?

A

3000 degree celecius

3,422 °C

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11
Q

Why is the light of ordinary lamp hotter than tubelight

A

It is due to incandescence

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12
Q

The resistance of a bulb rated 60 watts/ 220 volts is approx

A

800 (Horse Shoe)

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13
Q

Sonar works on the principle of

A

Reflection of Sound

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14
Q

A plant with green leave’ ?s placed in red light will appear

A

Black

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15
Q

The common refrigent used in the domestic refrigerator is

A

Freon/ Ammonia

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16
Q

Who said, ‘A body will remain at rest unless an external force acts on the body’?

A

Newton

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17
Q

Which metal is commonly used as an electormagnet

A

Iron

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18
Q

_____ does not admint any division

A

Atom

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19
Q

The dynamo converts

A

Mechanical energy into electrical energy

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20
Q

A red light is used in a traffic signal becuase

A

It has the longest wavelength and can be easily noticed from a distance

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21
Q

Metals are good conductors of electricity coz

A

The contain free electrons

22
Q

In diesel engines ignition takes place by

A

Compression

23
Q

Cloudy nights are warmer coz

A

Clouds prevent radiation of heat from ground to air

24
Q

If we go to the Himalayas, we feel breathless coz

A

The density of air is much less on the hills so oxygen content is reduced

25
Q

In deserts clouds do not precipitate coz

A

Low humidity

26
Q

Ultrasonic Waves?

A

Sound waves having high frequency higher than audio-frequency range

27
Q

A radar which detects the presence of an enemy aircraft uses

A

Radiowaves

28
Q

Fish plates are used in railway tracks

A

To control the speed of the train

29
Q

A fuse wire is used to

A

Prevent an unduly high electric current to pass through a circuit

30
Q

A molecule is

A

The smallest unit of a substance that retains the properties of the substance

31
Q

The nucleus of an atom consists of

A

Proton and Neutrons

32
Q

In what order does the velocity of sound increases in different media

A

Air, Water and Iron

Sound travels with a diff speed in diff media

33
Q

_____ metal is used in aircraft

A

Palladium

Platinum and palladium are used because they are stable, corrosion-resistant and durable.

34
Q

During rusting

A

Iron gains weight

35
Q

Rectifiers are used to convert

A

AC to DC

36
Q

Phenomenon of formation of three dimensional image by interference of two light beams from laser or other coherent source of light is called

A

Holography

37
Q

Paper becomes brittle and yellow with age, Why?

A
  • The acid cosenntent in paper causes brittleness to develop.
  • In the presence of light, Photosensitised oxidation occurs.
  • The ultra violet component of sunlight causes photolysis of cellulose by direct cleavage of the cellulose polymer
38
Q

____ is used as a coolant in nuclear reactors

A

Liquid Sodium

39
Q

____ is good nuclear fuel

A

Plutonium-239

40
Q

In atomic explosion, enormous energy is released which is due to the

A

Conversion of mass into energy

41
Q

_____ and ___ take place when the subject speaks untruth while being tested by the polygraph instrument

A
  • His blood pressure goes up

- His pulse quickens

42
Q

Aviation fuel for jet aeroplanes consists of purified

A

Kerosene

43
Q

A small weight is put on the pressure cooker. It increases the pressure of the steam coz

A

Bernoulli’s principle

44
Q

When an electric bulb breaks, there is a mild bang due to

A

The air rushing in to fill the evacuated space

45
Q

Kinetic energy depends

A

Both mass and velocity of the moving body

46
Q

The diff b/w a nuclear reactor and an atomic bomb is that

A

The chain reaction in nuclear reactor is controlled

47
Q

A ship rises as it enters the sea from a river coz

A

Density of sea water is higher than that of the river water

48
Q

Why is a cyclist required to bend inwards while moving inn a circular parth

A

To produce the neccsary centripetal force required to keep him moving in a curved path

49
Q

Heat recived by earth from the sun is known as

A

Solar radiation

50
Q

Special theory of relativity was proposed by

A

Einstein
(theory of special relativity, determined that the laws of physics are the same for all non-accelerating observers, and he showed that the speed of light within a vacuum is the same no matter the speed at which an observer travels)

51
Q

Isaac Newton gave

A

Laws of motion and laws of Gravitation

He was British

GK - EDS (19 decks)

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