(CAR) Physics 2

Question 1

The Hydraulic brakes used in automobiles is a direct application of

Answer 1

Pascal’s Law

Question 2

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

Answer 2

It is due to the fall in atmospheric pressure

Question 3

The speed of sound is maximum through which of the following

Answer 3

Glass

Question 4

Echo is the effect produced due to

Answer 4

Reflection of sound

Question 5

why are transfomers used in the transmission of electric power?

Answer 5

Because they can reduce transmission losses

Question 6

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

Answer 6

Oxygen and Argon

Question 7

Salty water has _____ density

Answer 7

Higher

Question 8

____ is used for detecting and measuring small electric currents

Answer 8

Galvanometer

Question 9

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

Answer 9

Copper

Question 10

What is the melting point of Tungsten?

Answer 10

3000 degree celecius

3,422 °C

Question 11

Why is the light of ordinary lamp hotter than tubelight

Answer 11

It is due to incandescence

Question 12

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

Answer 12

800 (Horse Shoe)

Question 13

Sonar works on the principle of

Answer 13

Reflection of Sound

Question 14

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

Answer 14

Black

Question 15

The common refrigent used in the domestic refrigerator is

Answer 15

Freon/ Ammonia

Question 16

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

Answer 16

Newton

Question 17

Which metal is commonly used as an electormagnet

Answer 17

Iron

Question 18

_____ does not admint any division

Answer 18

Atom

Question 19

The dynamo converts

Answer 19

Mechanical energy into electrical energy

Question 20

A red light is used in a traffic signal becuase

Answer 20

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

Question 21

Metals are good conductors of electricity coz

Answer 21

The contain free electrons

Question 22

In diesel engines ignition takes place by

Answer 22

Compression

Question 23

Cloudy nights are warmer coz

Answer 23

Clouds prevent radiation of heat from ground to air

Question 24

If we go to the Himalayas, we feel breathless coz

Answer 24

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

Question 25

In deserts clouds do not precipitate coz

Answer 25

Low humidity

Question 26

Ultrasonic Waves?

Answer 26

Sound waves having high frequency higher than audio-frequency range

Question 27

A radar which detects the presence of an enemy aircraft uses

Answer 27

Radiowaves

Question 28

Fish plates are used in railway tracks

Answer 28

To control the speed of the train

Question 29

A fuse wire is used to

Answer 29

Prevent an unduly high electric current to pass through a circuit

Question 30

A molecule is

Answer 30

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

Question 31

The nucleus of an atom consists of

Answer 31

Proton and Neutrons

Question 32

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

Answer 32

Air, Water and Iron | Sound travels with a diff speed in diff media

Question 33

_____ metal is used in aircraft

Answer 33

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

Question 34

During rusting

Answer 34

Iron gains weight

Question 35

Rectifiers are used to convert

Answer 35

AC to DC

Question 36

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

Answer 36

Holography

Question 37

Paper becomes brittle and yellow with age, Why?

Answer 37

- 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

Question 38

____ is used as a coolant in nuclear reactors

Answer 38

Liquid Sodium

Question 39

____ is good nuclear fuel

Answer 39

Plutonium-239

Question 40

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

Answer 40

Conversion of mass into energy

Question 41

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

Answer 41

- His blood pressure goes up | - His pulse quickens

Question 42

Aviation fuel for jet aeroplanes consists of purified

Answer 42

Kerosene

Question 43

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

Answer 43

Bernoulli's principle

Question 44

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

Answer 44

The air rushing in to fill the evacuated space

Question 45

Kinetic energy depends

Answer 45

Both mass and velocity of the moving body

Question 46

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

Answer 46

The chain reaction in nuclear reactor is controlled

Question 47

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

Answer 47

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

Question 48

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

Answer 48

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

Question 49

Heat recived by earth from the sun is known as

Answer 49

Solar radiation

Question 50

Special theory of relativity was proposed by

Answer 50

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)

Question 51

Isaac Newton gave

Answer 51

Laws of motion and laws of Gravitation | He was British