Physics Most Important One Liner Question and Answer part-10

Physics Most Important One Liner Question and Answer part-10

• The size of atomic nucleus is of the order of: 10^-14 m
• A temperature at which both the Fahrenheit and the centigrade scales have the same value – (- 40°)
• In the visible spectrum which colour has the shortest wavelength – Violet
• What is the unit of specific resistance – Ohm-metre
• What do we use as a moderator in nuclear reactor – Graphite
• The mirror used in motor vehicles near the driver’s seat is a__? – Convex Mirror
• Electron microscope was invented by – Robert Koch
• The hydraulic brake used in automobiles is a direct application of – Pascal’s Law
• The filament of an electric bulb is made of which metal – Tungsten
• Camberts Law is related to – Interference
• Which waves are used in sonography – Ultrasonic waves
• Which instrument is used to measure the power of electric circuit – Watt meter
• Splitting of Uranium nucleus releases - Nuclear energy
• kilowatt hour is the unit of – Energy
• A simple device that is used to either break or complete the electric circuit, is called – Switch
• Where the value of ‘g’ (acceleration due to gravity) is maximum – At poles
• Good conductors have many loosely bound – Electrons
• If the body is hollow, then its centre of gravity lies – outside the material
• A man with a dark skin, in comparison with a man with a white skin, experiences – Less heat, Less cold
• What is the escape velocity for all objects from the earth – 11.19 Km/sec
• If the temperature inside a room is increased, the relative humidity will – Decrease
• If a bar magnet is cut length wise into 3 parts, what will the total number of poles be – 6
• Light travels in a – Straight line
• What converts the alternating current into direct current? – Rectifier
• Einstein got noble prize for – Photoelectric Effect
• The nucleus of an atom consists of – Neutrons and protons
• What is the measuring unit of length of light waves – Angstrom
• How much is one barrel of oil approximately equal to – 159 litres
• The sky appears black from the moon because of – Lack of Atmosphere
• The specific resistance of a wire varies with its – Material
• Which instrument is used to measure depth of ocean – Fathometer
• The unidirectional property of a pn-junction is useful for its use as which thin – Rectifier
• The strongest force in the nature is – Nuclear Force
• Which is the only natural magnet – Magnetite
• We cannot see during a fog, because of – Scattering of light
• In which medium sound travels faster – Solid
• A fast wind can turn the blades of a windmill because it possesses – Potential Energy
• Which of the following material is used for electric wire heater? – Ni chrome
• Conversion of chemical energy into electrical energy occurs in which thing? –Battery
• The direction of a magnetic field within a magnet is – From South to north
• What remains constant while throwing a ball upward – Acceleration
• What type of lens is a magnifying glass – Convex lens
• Why does a liquid drop tend to assume a spherical shape – To minimize surface tension
• What happens when soda water bottle falls freely – No bubbles form
• Pure water freezes at what temperature – 32 F
• Why are Metals good conductor of heat than insulator – they contain free electrons
• When some detergent is added to water, the surface tension – Decreases
• The value of which quantity remains same in all system of units – Specific Gravity
• Distance of stars are measured i – Light Years
• Nature of sound wave is – Longitudinal
• Which is used to initiate fissions – Neutrons
• The total internal reflection can occur when light pass from – Denser to Rarer medium
• Who discovered Diode Bulb –Sir J. S. Fleming
• Radio waves of constant amplitude can be generated with – Oscillator
• What is the SI unit of luminous intensity – Candela
• What is the name of short duration wave – Pulse
• The absorption of ink by blotting paper involves – Capillary Action
• Two drops of a liquid are merged to from a single drop. In this process – Energy is released
• Which is more elastic (Steel or Rubber) – Steel
• An atom bomb is based on the principle of – Nuclear Fission
• Which instrument is used to measure the scattering of light by particles suspended in a liquid –Nephetometer
• The speed of light with the rise in the temperature of the medium – Remains unaltered
• Most commercial nuclear power plants worldwide are cooled by – Water
• Electric Motor converts – Electric energy to mechanical energy
• Nuclear sizes are expressed in a unit named – Fermi Weightlessness experienced in a spaceship is due to – Absence of Gravity
• blue colour of the clear sky is due to – Dispersion of Light
• What does airbag, used for safety of car driver, contain – Sodium Azide
• Radian is used to measure – Angle
• Who had showed that the electric and magnetic waves are equal in vacuum –James Clerk Maxwell
• When a red glass is heated in dark room it will seem – Green
• The friction force exerted by fluids is called – Drag
• Which is used in designing ships and submarines –Archimedes Principle
• Which instrument is used to measure change in volume of substances – Dilatometer
• On which principle, transformer works – Mutual Induction
• Potential energy of your body is minimum when you – Lie down on ground
• The velocity of sound in air – 332m/sec
• In summer, the mirages are seen due to the phenomenon of – Total Internal Reflection 87.
• Who gave the first experimental value of G – Cavendish 88.
• Astigmatism can be corrected by – Cylindrical lenses 89.
• What apparatus is used to locate a submerged object –SONAR 90.
• The image formed by convex lens in a simple microscope is –Virtual & Erect 91.
• What is the unit of magnetic flux – Maxwell 92.
• Collis tube is used to produce – X-Rays 93.
• Sudden fall in barometer is indication of - Storm 94.
• Force of attraction between the molecules of different substances is called –Adhesive Force 95.
• What is the working principle of Washing machine – Centrifugation
• Insects can move on the surface of water without sinking due to –Surface tension of water
• The temperature of the sun is measured with – Pyrometer
• Acceleration acts always in the direction – of the net force
• Which instrument is used to measure altitudes in aircrafts -Altimeter
• Beats occur because of – Interference
• Distance of stars are measured in - Light Years
• Nature of sound wave is - Longitudinal
• Which is used to initiate fissions - Neutrons
• The total internal reflection can occur when light pass from - Denser to Rarer medium
• Who discovered Diode Bulb - Sir J. S. Fleming
• Two vectors are equal if their- shape direction is same.
• What type of force acts on a car moving on a circular curved path - Centripetal force
• On what principle does the washing machine work – decentralization
• Under what conditions will the maximum weight of an object be on- the earth's pole