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