Physics basic inventions and inventors

1.Which instrument is used to measure altitudes in aircraft's ?

Audiometer

Ammeter

Altimeter

Anemometer

Explanation:

Ammeter - Measures strength of electric current.

Audiometer - Measures intensity of sound.

Anemometer - Measures force and velocity of wind and directions.

2. Which instrument is used to measure depth of ocean ?

Galvanometer

Fluxmeter

Endoscope

Fathometer

Explanation:

Galvanometer - measures electric current,
Fluxmeter - measures magnetic flux,
Endoscope - used to examine internal parts of the body.

3. Name of the instrument to measure atomspheric pressure ?

Barometer

Barograph

Bolometer

Callipers

Explanation:

Barograph - Recordings of atmospheric pressure,
Bolometer - Used to measure heat radiation,
Callipers - Used to measure inner and outer diameters of bodies.

4. Which instrument is used to measure the power of electric circuit ?

Voltmeter

Wattmeter

Wavemeter

Viscometer

Explanation:

Voltmeter - is used to measure electric potential difference between two points,
Wavemeter - is used to measure the wavelength of a radiowave,
Viscometer - is used measure viscosity of liquid.

5. Which instrument is used in submarine to see the objects above sea level ?

Pykometer

Polygraph

Photometer

Periscope

Explanation:

Pykometer - used to determine the density and coefficient of expansion of liquids,

Polygraph - used to record changes in heartbeat, blood-pressure and respiration,

Photometer - used to compare luminous intensity of the source of light.

6. Which instrument is used to measure curvature of spherical objects ?

Spectroscope

Spherometer

Spectrometer

Sextant

Explanation:

Spectroscope - used to record spectra,

Spectrometer - used to measure the position of spectral lines,

Sextant - used to measure the height of very distant objects and also used by navigators to find the latitude. what you thought :)

7. Which instrument is used to record physical happenings at a distant place ?

Thermostat

Tonometer

Telemeter

Transponder

Explanation:

Thermostat - is used to regulate the temperature at a particular point.

Tonometer - is used to measure the pitch of a sound,

Transponder - is used to receive a signal and transmit a reply immediately.

8. Which instrument is used to measure the scattering of light by particles suspended in a liquid ?

Nephetometer

Ohmmeter

Ondometer

Pyrometer

Explanation:

Ohmmeter - is used to measure electrical resistance in ohms,

Ondometer - is used to measure frequency of electromagnetic waves,

Pyrometer - is used to measure very high temperature.

9. Which instrument is used to determine the intensity of colours ?

Cathetometer

Chronometer

Colorimeter

Commutator

Explanation:

Cathetometer - is used to determine heights,

Chronometer - is used to longitude of a vessel at sea,

Commutator - is used to convert AC to DC.

10. Which instrument is used to measure changes in volume of substances ?

Dyanamo

Dilatometer

Cyclotron

Electroscope

Explanation:

Dyanamo - is used to convert mechanical energy into electrical energy,

Cyclotron - is a charged particle accelerator which can accelerate charged particles to high energies,

Electroscope - is used to detect the presence of an electric charge.

11. Which instrument is used to measure sound under water ?

Hygrometer

Hygroscope

Hypsometer

Hydrophone

Explanation:

Hygrometer - is used to measure level of humidity,

Hygroscope - shows the changes in atmospheric humidity,

Hypsometer - is used to determine the boiling points of liquids.

12. Which instrument is used to measure pressure of gases ?

Manometer

Machmeter

Magnetometer

Micrometer

Explanation:

Machmeter - is used to determine the speed of an aircraft in terms of speed of sound,

Magnetometer - is used to compare magnetic movements and fields,

Micrometer - is used to convert sound waves into electrical vibrations.

13. Which instrument is used to measure heat radiation ?

Radar

Salinometer

Refractometer

Radio micrometer

Explanation:

Radar - is used to detect the direction and speed of an object by means of radiowaves,

Salinometer - is used to determine salinity of solutions,

Refractometer - is used to measure refractive indices.

14. Which instrument is used to measure strength of direct current ?

Stroboscope

Streoscope

Tangent Galvanometer

Tachometer

Explanation:

Stroboscope - is used to view rapidly moving objects,

Streoscope - is used to view two dimensional pictures,

Tachometer - is used to determine rotational speed of a shaft (used in aeroplanes and motor boats).

15. K. Macmillan invented

Bicycle

Barometer

Calculating Machine

Centigrade Scale

Explanation:

K. Macmillan of Scotland invented Bicycle in 1839.

Barometer was invented by E. Torricelli of Italy in 1644.

Calculating Machine was invented by Pascal of France in 1642.

Centigrade Scale was invented by A. Celsius of France in 1742.

17. Alfred Nobel invented

X ray

Diesel Engine

Dynamite

Dynamo

Explanation:

Alfred Nobel if Sweden invented Dynamite in 1867,

X ray was invented by Wilhelm Roentgen of Germany in 1895,

Diesel Engine was invented by Rudolf Diesel of Germany 1892,

Dynamo was invented by Michael Faraday of England in 1831.

18. David Hughes invented

Machine Gun

Microphone

Microscope

Motorcycle

Explanation:

David Hughes of USA invented Microphone in 1878,

Machine Gun was invented by Richard Gatling of USA in 1861,

Microscope was invented by Z. Jansen of Netherlands in 1590,

Motorcycle was invented by Edward Butler of England in 1884.

19. Marie and Pierre Curie invented

Radio

Radium

Radar

Refrigerator

Explanation:

Marie and Pierre Curie of France invented Radium in 1898,

Radio was invented by G. Marconi of England in 1901,

Radar was invented by Dr. A.H. Taylor and L.C. Young of USA in 1922,

Refrigerator was invented by J. Harrison and A. Catlin of Britain in 1834.

20. Alexander Graham Bell invented

Telephone

Telescope

Television

Tank

Explanation:

Alexander Graham Bell of USA invented Telephone in 1876,

Telescope was invented by Hans Lippershey of Netherlands in 1608,

Television was invented by John Logie Bared of Scotland in 1926,

Tank was invented by Sir Ernest Swington of England in 1914.

21. Harry Brearley has invented

Electric iron

Electromagent

Stainless Steel

Gramophone

Explanation:

Harry Brearley of England has invented Stainless Steel in 1913,

Electric iron has been invented by H.W. Seeley of USA in 1882,

Electromagent has been invented by W.Sturgeon of England in 1824,

Gramophone has been invented by T.A. Edison of USA in 1878.

22. Who discovered Atom ?

Madam Curie

James Chadwick

Rutherford

John Dalton

Explanation:

John Dalton discovered Atom in 1808,

Madam Curie discovered Radium in 1898,

James Chadwick discovered Neutron in 1932,

Rutherford discovered Proton in 1919.

23. Who discovered Diode Bulb ?

Henry Becquerel

Sir J.S. Fleming

Lee De Forest

Archemedes

Explanation:

Sir J.S. Fleming discovered Diode Bulb in 1904,

Lee De Forest discovered Triode Bulb in 1906,

Archemedes discovered laws of floatation in 1827,

Henry Becquerel discovered Radioactivity in 1896.

24. Radiocarbon is produced in the atmosphere as a result of

collision between fast neutrons and nitrogen nuclei present in the atmosphere

25. The absorption of ink by blotting paper involves

capillary action phenomenon

27. Nuclear sizes are expressed in a unit named

Fermi

28. Light year is a unit of

Distance

29. Radian is used to measure

Angle

Explanation:

Kelvin is used to measure Temperature,

Candela is used to measure Intensity of flame,

Steredian is used to measure Solid Angle.

30. newton is used to measure

Force

31. radian per second is unit of

Momentum

Moment of Inertia

Frequency

Angle Velocity

Answer: Option D

Explanation:

unit of Momentum is kilogram meter per second,

unit of Moment of Inertia is kilogram square meter,

unit of frequency is Hertz.

32. unit of Pressure is

newton second

pascal

watt

newton per meter

Explanation:

newton second is unit of impulse,

watt is unit of Power,

newton per meter is unit of Surface Tension.

33. What is unit of Work and Energy ?

Joule

34. What is unit of Viscosity ?

coulomb

newton second per square meter

watt per meter per degree celcius

joule per kilogram per Kelvin

Explanation:

coulomb is unit of Electric Charge,

watt per meter per degree celcius is unit of Thermal Conductivity,
joule per kilogram per Kelvin is unit of Specific Heat capacity.

35. What is unit of Electrical Capacity ?

henry

farad

volt

ohm

Explanation:

henry is unit of Magnetic Induction,

volt is unit of Potential Difference,

ohm is unit of Electric Resistance.

36. What is unit of Astronomical distance ?

light year

angstrom

weber

lux

Explanation:

angstrom is used to measure wave length,

weber is used to measure Magnetic flux,

lux is used to measure Intensity of illumination.

37. Scalar Quantities are

physical quantities which have magnitude only and no direction

39. Which law is also called law of inertia ?

Newton first law

40. What is newton third law of motion ?

Every body maintains its initial state rest or motion unless no external force is applied.

The rate of change in momentum of a body is directly proportional to the applied force on the body and takes place in the direction of force.

To every action there is equal and opposite reaction.

None of above.

Explanation:

Newton First Law of Motion : Every body maintains its initial state rest or motion unless no external force is applied.

Newton Second Law of Motion : The rate of change in momentum of a body is directly proportional to the applied force on the body and takes place in the direction of force.

41. If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this ?

Principle of conservation of linear momentum

42. The rotational effect of a force on a body about an axis of rotation is described in terms of

Moment of force

43. Energy posses by a body in motion is called

Kinetic Energy

44. Electric Motor converts

Electrical energy into mechanical energy

45. Solar cell converts

Solar energy into electrical energy

46. If lift is going up with acceleration, the apparent weight of a body is

more than the true weight

47. All planets move around the sun in elliptical orbits, with the sun being at rest at one focus of the orbit.

True

False

48. Orbital speed of a satellite is dependent of its mass.

True

False

Explanation:

Orbital speed of a satellite is independent of its mass.

49. What is escape velocity ?

Escape velocity is the minimum velocity with which a body should be projected from the surface of earth so as it goes out of gravitational field of earth and never return to earth.

50. Atmospheric pressure is measured by

Barometer

51. Sudden fall in barometer is indication of

Storm

52. Which is true

In a static liquid at same horizontal level, pressure is same at all points

53. When a body is immersed partly or wholly in a liquid, there is an apparent loss in weight of the body which is equal to the weight of liquid displaced by the body.

True

False

Explanation:

TRUE, it is Archimedes Principle.

54. Force of attraction between the molecules of different substances is called

Cohensive force

Explanation:

Cohensive force - Force of attraction between the molecules of same substance is called Cohensive force.

55. The force which opposes the relative motion between different layers of liquid or gases is called

Critical Velocity

Streamline Flow

Terminal Velocity

Viscous Force

Explanation:

Critical Velocity - The maximum velocity upto which fluid motion is streamline is called Critical Velocity.

Streamline Flow - If velocity of all fluid particles is same all the time then it can be said in streamline flow.

Terminal Velocity - When a body falls in viscous medium, its velocity first increases and finally becomes constant. The constant velocity is called terminal velocity.

56. What is the maximum value of deforming force upto which a material shows elastic property and above which the material loses it ?

Elastic Limit

57. What is Hooke's Law ?

Stress is directly proportional to strain.

58. Lognitudinal waves and Transverse waves are types of ?

Mechanical waves

59. Which of the following is an electromagnetic wave ?

Infra red rays

60. What is the relation between wavelength, frequency and velocity ?

velocity of wave = frequency * wavelength

61. What are audible sound waves ?

Having frequency between 20 Hz to 20000 Hz

62. What is the range of mercury thermometer ?

-30 degree Celsius to 350 degree Celsius

63. Which law states, "The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings."

Doppler's Effect

Newton's law of cooling

Kirchhoff's Law

Stefan's Law

Explanation:

Doppler's Effect - The Doppler effect can be described as the effect produced by a moving source of waves in which there is an apparent upward shift in frequency for observers towards whom the source is approaching and an apparent downward shift in frequency for observers from whom the source is receding.

Kirchhoff's Law - Kirchhoff's Law signifies that good absorbers are good emitters.

Stefan's Law - The radiant energy emitted by a black body per unit area per unit time is directly proportional to the fourth power of its absolute temperature.

67. Which are the primary Colours ?

Yellow, Green, Blue

Red, Magenta, Blue

Red, Green, White

Red, Green, Blue

Explanation:

Red, Green, Blue are primary colours. All the colours can be produced by them by mixing in different proportions. Interesting :)

68. Device used to measure potential difference between two points in a circuit is ?

Voltmeter

70. Which of following in not a property of cathode ray.

Cathode rays are invisible and travel in a straight line.

These rays can ionise gases.

These rays can penetrate through thin metal foils.

These rays make materials cool on which they fall.

Explanation:

These rays heat the materials on which they fall.

71. The nuclear reaction in which a heavy nucleus splits into two nuclei of nearly equal mass is called

Nuclear fission