The mode of travel of heat energy from the sun across the empty space beyond the earth's atmosphere is known as
conduction
convection
radiation
absorption
Correct Answer :
C. radiation
Related Questions
The source of electric energy in an artificial satellite is
mininuclear reactor
a dynamo
a thermopile
solar cells
The instrument used to measure the strength of electric current at a point is
Ammeter
Altimeter
Adrinometer
Anemometer
A hydraulic brake in an automobile uses
a fluid to transmit the braking force
the force applied by the driver
hydrogen gas and not any liquid
a vacuum brake
The planet with the reddish tinge is
Jupiter
Mars
Mercury
Saturn
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
In experiments on static electricity the standard method for obtaining small amounts of positive electricity is to rub
a glass rod with flannel
an abonite rod with flannel
a glass rod with silk
Any of the above
Which is the densest planet of the solar system?
Sun
Jupiter
Mercury
Earth
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 radiator in a car serves to
cool the engine
heat up the engine
start the car
moderate the speed
When the resistance of a circuit increases the current will
increase
decrease
remain the same
None of the above
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
A man Jumping out of a moving train is thrown
forward
backward
sideways
None of the above
If a man wants to hear clearly the echo of a sound produced by him from a hill, the hill should be away from him by a minimum distance of
330 m
33 m
16.5 m
165 m
When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is
the violet ray
the red ray
the green ray
the blue ray
The stem of a vibrating tuning fork is pressed against a sound box. Then
the loudness of the sound increases
the loudness remains the same
the loudness decreases
the sound suddenly stops
One can be recognised by his voice alone due to the factor of
quality
amplitude
pitch
loudness
The evaporation rate depends on
the nature of the liquid
area of the exposed surface of the liquid
temperature of air and of the liquid
All the above
When we tighten the string of a sitar or tanpura its pitch
remains the same
increases
decreases
None of the above
Water has maximum density at
0° C
-15° C
4° C
15° C
The aneroid barometer uses
mercury
distilled water
alcohol
does not use any liquid
A pressure gauge for fluids is called
a hydrometer
a manometer
a lactometer
an anemometer
Which of the following wires of same dimensions offers least resistance to the ,flow of current?
copper
aluminium
silver
nichrome
Mercury is used in thermometers because
it has high thermal conductivity
it has uniform expansivity
it has high boiling point and low freezing point
of all the above
The Cact that the compass needle does not point true north was observed first by
Sir Isaac Newton
Columbus
Archimedes
Thomas Alva Edison
A pressure gauge for fluids is called
a hydrometer
a manometer
a lactometer
an anemometer
The brightest planet in the Solar System is
Jupiter
Mercury
Venus
Sirius
The ozone layer absorbs
Cosmic rays
Infrared rays
All radiations of light
Ultra violet rays coming from the sun
The hygrometer is an apparatus used for finding the
temperature of air
intensity of light
density of a liquid
relative humidity of the atmosphere
When temperature decreases, resistance of metals to flow of electricity
increases
decreases
neither increases nor decreases
first increases then decreases
Photo-electric cells convert
electrical energy into light energy
light energy into electrical energy
light energy into heat energy
electrical energy into heat energy