The heat generated in a conductor carrying current is proportional to
the resistance
the square of the current flowing through it
the time the current flows
All the above
Correct Answer :
D. All the above
Related Questions
Solar radiation is preferred to other sources of energy because
it is practically inexhaustible
it is the cheapest form of energy
it does not cause pollution
All of the above
A heavenly body similar in nature to the sun intensely hot glowing mass that produces its energy by thermonuclear reactions is
a planet
a meteor
a star
a comet
On applying a constant force to a mass, It moves with a uniform
velocity
momentum
acceleration
angular velocity
Lightning conductors are made of
iron
chromium
copper
steel
Which part of the eye photographic camera?
Lens
Iris
Retina
Eyelid
The frequency of an ultrasonic wave is
the same as that of an audible sound
above the audible range
below the audible range
None of the above
The filament used in the electric lamp is made of
nichrome
tungsten
copper
aluminium
The completely dark portion of a shadow of an object is known as
umbra
penumbra
image
black portion of light
When a bullet is fired from a gun
the gun moves forward
the gun jumps up
the gun does not move
the gun recoils with the same momentum as the bullet
The characteristics of a musical note are
loudness
pitch
quality or timbre
All the above
The instrument used to measure atmospheric pressure is
Pyrometer
Eudiometer
Barometer
Hydrometer
The electrical domestic tube light gives white fiourescent light because of
collision between molecules of filled gas under electric current
heavy current
vacuum inside the tube
falling of ultra violet rays on the white inner coating of the tube
The brightest star visible to the naked eye is
Sirius
Vega
Rigel
Proxima Centauri
Which of the following is not electromagnetic waves?
heat waves
sound waves
radio waves
light waves
The leader of the team who succeeded in constructing the first nuclear reactor (an atomic pile) in the world was
Albert Einstein
Enrico Fermi
HJ Bhabha
Sir Isaac Newton
The end product in the uranium disintegration series is
lead
zinc
carbon
tin
The acoustical quality of a room depends on
the size and shape of the room
the ability of the ceiling, walls and floor to exclude unwanted sound
the use of furnishings made of sound absorbing materials
All the above
A transformer
converts direct current into alternating current
converts alternating current into direct current
steps up or steps down a given alternating current voltage
supplies current with zero resistance
A piece of cork is embedded inside an ice block which floats in water. What will happen to the level of water when all ice melts?
It will go down
It will come up
It will remain at the same level
First it will go down and it will come up
Pyrometers are instruments used
for measuring the velocity of wind
in the manufacture of fireworks
in finding the coefficient of apparent expansion of a liquid
for measuring high temperatures
Gamma radiations are used for
sterilising food stuff
controlling pests
cancer therapy
All of these
The Space Application Centre for training in Satellite Communication Technology is located at
Bangalore
Mumbai
Ahmedabad
New Delhi
Halley's comet appears in the heavens once in
40 years
50 years
76 years
80 years
The function of a ruse wire is
to stabilise the voltage
to decrease the current supply
to increase the current supply
to prevent an unduly high current from passing through a circuit
A man Jumping out of a moving train is thrown
forward
backward
sideways
None of the above
Tap water is placed in an open pad and allowed to evaporate. After some time the temperature of water
increases to a great extent
increases slightly
decreases slightly
decreases rapidly
The spectrum of white light can be studied by
a microscope
a telescope
a stereoscope
a spectroscope
The mixing up of two gases as a result of random motion of molecules is called
diffusion
effusion
vaporisation
sublimation
Why is it cool near an open pond on a hot summer day?
Evaporation at the surface causes cooling
The heat obsorbed at the surface is passed on to the bottom
Because of impurity in the water
Because of convection currents set up inside water
A cyclist leans inwards when he is negotiating a curve 10 that
he may increase his speed
his weight may be reduced
necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion
no frictional force may be produced between the wheels and the axle