100 Important Physics Question for RRB And SSC

100 Important Physics Question for RRB And SSC

Who firstly demonstrated experimentally the existence of electromagnetic


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


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?

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 ? Wattmeter
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     ?

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?

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





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? Nichrome
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 ?

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
The 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
Beats occur because of ? Interference



Who gave the first experimental value of G? Cavendish
Astigmatism can be corrected by ? Cylindrical lenses
What apparatus is used to locate a submerged object? SONAR
The image formed by convex lens in a simple microscope is . Virtual & Erect
What is the unit of magnetic flux? Maxwell
Coolis tube is used to produce     ? X-Rays
Sudden fall in barometer is indication of     ? Storm
Force of attraction between the molecules of different substances is

called     ?

Adhesive Force
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

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