Physics Most Important One Liner Question and Answer part - 8

Physics Most Important One Liner Question and Answer part - 8

• Rotation of the earth causes deflection of wind by – Coriolis force
• How powerful hydrogen bomb is in comparison to nuclear bomb – 1000 times
• What is scattering of light – transmission of light in every direction by - molecule’s medium
• Who invented seismometer – Robert Mallet
• Lunik-II was the first spaceship - to land on moon
• Goniometer - is used to measure the angle of the crystal
• When light waves pass from air to glass, the variables affected are – wavelength and velocity
• A ball rolling along the ground gradually slows down and finally comes to rest is due to – Friction
• Friction is caused by the …on the two surfaces in contact – irregularities
• The isothermal modulus of elasticity of an ideal gas is equal to - its pressure
• The instrument used for finding out wind direction is – wind vane
• The motion of a freely falling body is an example of – uniformly accelerated motion
• If the force applied on the object is in the direction of its motion, the speed of the object – increase
• Convex and concave mirrors are example of – spherical mirrors
• The frictional force exerted by fluids is also called – drag
• The instrument used to measure the electric current is – Ammeter
• The reflection formed by the plane mirror is – lateral inversion
• The distance-time graph for the motion of an object moving with a constant speed is a – straight line
• An image that can be obtained on a screen is called - Real image
• The instrument used to measure potential difference between two points – Voltmeter
• The impression of an image persists on the retina for about – 1/16th of a second
• During uniform motion of an object along a straight line, - Velocity remains constant with time
• The incident ray, the ….at the point of incidence and the reflected ray all lie the same plane – normal
• Steel is more elastic than rubber because – Ratio of stress to strain is more
• According to the second law of motion, the force is directly proportional to which of the – acceleration
• The coil wire in the electric room heater or electric cooking heater is called – element
• An image formed by a plane mirror, that cannot be obtained on a screen is called – virtual image
• Glass is – super cooled liquid
• The force exerted by a magnet is an example of – non contact force
• Which type of friction occurs when ball bearings are used to slide a body – rolling friction
• What effect on wavelength of light is visible when it passes through rarer to denser medium – decrease
• What is the use of radio telescope – to detect radio-frequency radiation emitted
• What is frequency affected by – length, gravity, tension, and density
• Who is the father of the refrigerator – Jacob Perkins
• Fathom is unit of – depth of sea
• What is the principal used in a pressure cooker - Pressure Temperature Law
• Who found out about buoyancy – Archimedes
• Which waves cannot be polarized – Ultrasonic
• Contact force is another name for – Friction
• The most abundant metal in the earth’s crust is – aluminium
• In hydel power station, the motion produced in turbines is due to – Flow of water
• The substance which reduces friction are called – lubricants
• Which layer of the earth’s atmosphere reflect back the radio waves to the earth’s surface – Ionosphere
• The law on the principal of the method of mixture is based on – law of conservation of energy
• What are the basic laws of physics – Classical Physics and Atomic physics
• The oldest type of energy known to man is – Geothermal energy
• How many laws of thermodynamics are there – 4
• Which instrument used for detecting and measuring electric current – Galvanometer
• In which unit, the pollution of noise is measured – Decibel
• Which device used to convert DC to AC – Power inverter
• Who proposed continental drift theory – Alfred Wegener
• Who invented the contact lenses – Adolf Gaston Eugen Fick
• If the earth shrinks to half of its radius without change in mass, the duration of the day will be – 24 Hours
• Electrons move around the nucleus in – orbital motion
• Blood pressure is measured by – Sphygmomanometer
• What is inertia – tendency to resist change in the current state
• Isaac Newton invented – Reflecting Telescope
• SI unit of surface tension is – N/M
• A body is equilibrium – can move with constant velocity
• When net torque is zero – angular momentum will be constant
• Newton’s first law is also known as – Law of inertia
• SONAR is based on the principal of – Echo
• The sliding friction is – smaller than the static friction
• Who discovered the Anode Rays – Eugen Goldstein
• Which lenses used to remove the defect of presbyopia – Bifocal lens
• What is the speed of sound in iron – 5130 M/s
• What is the angle between centripetal acceleration and tangential acceleration – 900
• Rectifiers convert – AC to DC
• An object is in static equilibrium when it is – at rest
• Instrument for measuring thickness or amount of rainfall is called – Hyetometer
• Atmospheric pressure is measured by – Barometer
• How can we measure specific gravity of milk – using a hydrometer
• What are the two kinds of Rotatory motion – spin and orbital motion
• Instrument for measuring wind velocity is called – Anemometer
• What is the viscosity of an ideal fluid – Zero
• Which of these equals the impulse applied – Change in momentum
• Light travels fastest in – Vacuum
• When the position of object in convex lens is at infinity, the size of image will be – highly diminished
• In coloured television – 3 primary colours are used
• A pendulum goes? in winter and? summer – Fast, slow
• A fat person will be able to swim easily than a thin one because of – Archimedes’ principle
• In a static liquid, pressure is – Same at same horizontal levels
• The sodium and mercury street lamps light up due to – Atomic emission
• The year in which total solar eclipse occurs is a – Tropical year
• Isogonic lines are the lines that join the places of the same – Declination
• Which phenomena prove that light waves are transverse waves – Polarisation
• Diode valve was designed by – JA Fleming
• What is the unit of relative density – it has no unit
• Density of water is maximum at – 4 degree Celsius
• The strain produced in a body is directly proportional to the stress applied on it, is called – Hooke’s law
• electroscope was invented by - William Gilbert
• The glowing surface of the sun is called – Photosphere
• which is an insulator – Mica
• the strength of a force is usually expressed by its – Magnitude
• who discovered Proton – Ernest Rutherford
• if a ball is thrown up which of the following does not change – Acceleration
• the time taken by a pendulum to complete one oscillation is called its – Time Period
• which physical quantity is measured in ‘siemens’ – Electric Conductance
• rate of change of momentum is – Force
• upward force on a floating body is called – buoyancy