The radiator in a car serves to
cool the engine
heat up the engine
start the car
moderate the speed
Correct Answer :
A. cool the engine
Related Questions
The rings of Saturn were discovered by
Galileo
Bhaskara
Aryabhatta
Ptolemy
The inside of both the walls of a thermos flask is silvered i.e., on the vacuum side in order to reduce heat loss by
convection
radiation
conduction
All the three
A nuclear reactor is said to have become 'critical' when
it stops due to malfunctioning
it starts emitting dangerous radioactive radiations
it is shut down to avoid explosion
it is ready to produce controlled energy
The inside of both the walls of a thermos flask is silvered i.e., on the vacuum side in order to reduce heat loss by
convection
radiation
conduction
All the three
The tiniest of the stars belong to the group known as
Giant stars
White Dwarf stars
Neutron stars
Super-giant stars
The solar wind is composed of
outward stream of protons and electrons on the surface of the sun during solar flares and sun-spot activity
plasma
ionized gas
All of these
The device used to record the sound is
a microphone
a headphone
a phonograph
an amplifier
The difference between planets and stars is
planets do not have light of their own whereas stars shine by their own light
planets do not twinkle like stars
planets are much smaller than stars
All the above
Electron-volt is a unit of
power
velocity
energy widely used in nuclear physics
number of electrons
The weight of a body is
maximum at the equator
minimum at the equator
minimum at the poles
the same everywhere
'Acoustics' is a branch or study dealing with
historical sites
architecture
sound
trigonometry
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
Among the following the most suitable material for the core of an electro-magnet is
steel
wood
soft iron
copper
Out of the following which element has the longest half-life period?
Radium
Radon
Uranium-238
Plutonium
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
The first Indian Satellite launched from a Russian Cosmodrome on April 16, 1975 was named
Bhaskara
Insat I-A
Aryabhatta
SLV-l
Diamond shines because of its
purity
hardness
high density
high refractive index and low critical angle
The focal length or lens or the eye is under the control or the
iris
pupil
ciliary body
cornea
A lactometer is 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
Powder clings to the skin because of
cohesion
adhesion
capillary action
absorption
In a vacuum the following three articles are dropped at the same time and from the lame height. Which will reach the ground quicker?
a stone
a piece of wood
a feather
all will reach the ground at the same time
The red colour of the setting sun is due to
the least scattered red colour reaching the eye
the dispersion of sun light occurred in air molecule in atmosphere
the diffraction of sunrays in atmospheric layers
interference of all the rays coming from the sun
The force that keeps a body in a circular motion is called
the centripetal force
the centrifugal force
the frictional force
All the above
If a bar magnet is broken into two pieces
both pieces will lose their magnetism
one piece will have North Pole on both ends and the other South Pole on its both ends
each will remain a magnet with North Pole at one end and South Pole at the other
the longer piece will behave as a bar magnet while the smaller will have no magnetism at all
A photon is
a quantum of electromagnetic radiation
light source used in photography
a photo film
sun-light
An ammeter has
a high resistance
a very low resistance
no resistance at all
resistance of 400 � w
The colour of the light which travels through glass with minimum speed is
red
violet
green
yellow
The radiator in a car serves to
cool the engine
heat up the engine
start the car
moderate the speed
One finds it more difficult to walk on ice than on a concrete road because
there is more friction on ice than on concrete surface
ice is soft and spongy while concrete is hard
the friction between ice and the feet is less than that between the concrete and the feet
None of them
Which of the following apparatus is used in the electrolysis of water?
Voltmeter
Voltameter
Ammeter
Potentiometer