TOP 100 Question of Physics – For SSC, Railway, UPSC,Banking

physics gk in one liner

Who firstly demonstrated experimentally the existence of electromagnetic wave?    –Heinrich Rudolf Hertz

The working of the quartz crystal in the watch is based on which effect?   –   Piezoelectric Effect

What is te the unit of Radioactivity?  –  Curie

What is the wavelength of visible spectrum? – 390-700 nanometres

One astronomical unit is the average distance between___?  –  Earth & Sun

Number of basic S.I. units is ___.  –  Seven (7)

What is the name of the scientist who stated that matter can be converted into energy?   –  Einstein

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_____ energy.   –   Nuclear

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?  –  11.16 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 thing?  –  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 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

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.

Coolis 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 97.

Insects can move on the surface of water without sinking due to___.   –Surface tension of water 98.

The temperature of the sun is measured with ___.  – Pyrometer 99.

Acceleration acts always in the direction__?   –of the net force 100.

Which instrument is used to measure altitudes in aircrafts ?   -Altimeter

Beats occur because of __?  – Interference

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