An electric fan converts
electrical energy into heat energy
electrical energy into mechanical energy
mechanical energy into electrical energy
mechanical energy into heat energy
Correct Answer :
B. electrical energy into mechanical energy
Related Questions
The overhead wires supported by high towers in the grid system carry
alternating current of very high frequency
alternating current of very high voltage
a very large direct current
a high voltage direct current
Sound waves in air are
transverse
longitudinal
transverse and longitudinal
neither transverse nor longitudinal
A small bubble of air deep down in a lake rises up to the top of the lake. The volume of the bubble on coming up will
increase
decrease
will not change
first increase and then decrease
The method used to separate aluminium from a alumina is
electroplating
electrotyping
electrolysis
distillation
Ultrasonic waves are used
in medical and surgical diagnosis
in testing the quality of the linings and pads used in vehicles and aircraft brakes
to clean surgical instruments, jewellery and similar articles
All the above
On applying a constant force to a mass, It moves with a uniform
velocity
momentum
acceleration
angular velocity
A lactometer la used to
find out the specific gravity of liquids
measure the volumes of liquids
test the purity of milk
determine the strength of acid in car batteries
The theory that the earth constituted the centre of the universe around which the sun and the planets revolved was propounded by
Copernicus
Ptolemy
Newton
Kepler
A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be
a parabola
a horizontal straight line
a vertical straight line
a circle
The radius of an atom is approximately
10-10 cm
10-12 cm
10-13 cm
10-16 cm
Echoes are produced by
the reflection of sound waves
the refraction of sound waves
the interference of sound waves
reverberation of sound waves
X-rays were discovered by
Wilhelm Roentgen
WO Coolidge
Henry Cavendish
William Watson
Which force is used when milk is churned to separate cream?
cohesive
centrifugal
frictional
gravitational
How is it that Pluto is not always the farthest planet of the solar system?
Each planet becomes the farthest planet in its turn. Now it is the turn of Piuto
The Sun is now in the zodiac in which it is nearest to outer planets
The eccentricity of Piuto's orbit being substantial, this orbit cuts the orbit of Neptune
Piuto belongs to other solar system
The plants in a greenhouse are enclosed in a glass enclosure because
glass allows the heat radiations of shorter wavelengths from the sun to pass through
the plants absorb them - these shorter wavelengths - and reradiate them in the form of longer wavelengths
the longer wavelengths cannot penetrate through the glass walls
All the above
Credit for starting Space Science Research in India goes to
HJ Bhabha
SS Bhatnagar
V Sarabhai
CV Raman
Which of the following rays has the highest penetrative power?
�± -rays
�² -rays
�³ -rays
X-rays
Gamma radiations are used for
sterilising food stuff
controlling pests
cancer therapy
All of these
The period of oscillation of a simple pendulum depends upon
the mass of its bob
the material of the bob
the amplitude of vibration
acceleration due to the gravity at the site of experiment
Stars twinkle because of
refraction of light from them through air
reflection
absorption
All the above
The star nearest to the sun is
Proxima Centauri
Sirius
Aldebaran
Vega
Enriched uranium means
Uranium that is very pure
Uranium in which the concentration of the isotope U-238 is more than in the naturally occuring uranium
Uranium in which the concentration of the isotope U-235 is more than in the naturally occuring uranium
None of the above
The maximum displacement of the particle in a mechanical wave motion is known as
amplitude
vibration
frequency
phase
A device used to measure heights above sea level is known as
altimeter
anemometer
dilatometer
potentiometer
One can be recognised by his voice alone due to the factor of
quality
amplitude
pitch
loudness
A spherical mirror is
a reflecting elliptical portion
a reflecting spherical surface
a parabolic reflecting surface
a flat reflecting surface
The rocket engine is motivated by jet propulsion which uses the famous
Kepler's Laws
Newtonian Third Law of Motion
Bernoulli's Principle
Law of Relativity
The radiator in a car serves to
cool the engine
heat up the engine
start the car
moderate the speed
Alpha particles are
electromagnetic radiations
helium nuclei
negatively charged particles
neutral particles
The device for tracking and locating the position of a moving object in space is called
Space ship
Lunar module
Radar
Rocket