A car parked in the sun with its windows closed gets terribly hot inside. This is due to
the heat emitted by the engine
the greenhouse effect
the good conducting power of the metal body
the double layered wind shield
Correct Answer :
B. the greenhouse effect
Related Questions
Electromagnets are used in
the telephone ear piece
the telegraph
the electric bell
All the above
In the visible spectrum which colour has the shortest wavelength?
Red
Blue
Yellow
Violet
Which force is used when milk is churned to separate cream?
cohesive
centrifugal
frictional
gravitational
Rain drops acquire spherical shape due to
viscosity
surface tension
friction
elasticity
In a longitudinal wave, the direction of propagation of the wave is
the same as the direction of the vibrations of the vibrating body
at right angles to the direction of the vibrations of the vibrating body
Both (a) and (b) above
None of the above
Of the following which has got the highest frequency?
ultraviolet rays
gamma rays
radio waves
infrared waves
A device used to measure heights above sea level is known as
altimeter
anemometer
dilatometer
potentiometer
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
An electric charge is measured in
coulomb
ampere
volt
watt
A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching the sides or touching the bottom of the bucket. The reading of the spring balance
will increase
will decrease
does not change
varies with the increase of depth of the immersion of the iron piece
A radio set that uses valves does not start operating immediately when it is switched on whereas a set containing only tranaistors operates immediately. The reason for this is that
the valve filaments have low resistance
valve-radio sets work at a higher voltage
transistor set has a low resistance
filaments of the valves cake time to beat up and function
A solar eclipse occurs when the earth, the sun and the moon are in a straight line, and
when the moon passes between the sun and the earth
when the sun comes between the earth and the moon
when the earth comes between the sun and the moon
on a full moon day
The source of electric energy in an artificial satellite is
mininuclear reactor
a dynamo
a thermopile
solar cells
Lightning conductors are made of
iron
chromium
copper
steel
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
Chronometer is an instrument to measure
heat
electric potential
time
distance between two points
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
Sound travels fastest in
air
water
iron
vacuum
The phenomenon of radioactivity was discovered by
Rutherford
Bohr
Henri Bacquerel
Marie Curie
When light passes from air to glass, its velocity in glass
increases
decreases
remains unchanged
first decreases then increases
Some persons are not able to see distant objects clearly because the image of the object is focused in front of the retina. This defect is known as
short sight
long sight
astigmatism
presbyopia
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
The aneroid barometer uses
mercury
distilled water
alcohol
does not use any liquid
Electron-volt is a unit of
power
velocity
energy widely used in nuclear physics
number of electrons
Besides protons, the nucleus of an atom contains
electrons
neutrons
neutrons and electrons
electrons, neutrons and other particles
The method used to separate aluminium from a alumina is
electroplating
electrotyping
electrolysis
distillation
The atmosphere gets heated up mainly by
direct sun's rays
radiation from earth's surface
radiogenic heat (resulting from radioactive decay)
cosmic rays coming from space
The asteroids belt lies between the orbits of
Earth and Mars
Venus and Earth
Mars and Jupiter
Moon and Mars
The orbit of Venus lies between those of
Mercury and Earth
Earth and Mars
Mars and Saturn
Mars and Jupiter
The sun continuously produces an enormous amount of energy. This is due to
nuclear fission
nuclear fusion
chemical combustion
boiling