Light from the sun reaches the earth in
2 minutes
4 minutes
12 minutes
8 minutes
Correct Answer :
D. 8 minutes
Related Questions
Meteors
look like falling stars
are really pieces of rock or metal
burn up as they shoot through the air
All the above
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
Sun spots are
the mountains found on the surface of the Sun
the dark patches on the sun having less temperature than the normal sun's surface
ionized gas found near the solar surface
the magnetic storms on the surface of the Sun
Who first established the fact that the earth revolves round the sun?
Sir Isaac Newton
Kepler
Copernicus
Ptolemy
The best estimates of the age of the earth comes from the studies of
angle of inclination of the earth
changes in radio-active minerals in it
period taken by Sun's light to reach the earth
artificial satellites revolving round the earth
Lightning conductors are made of
iron
chromium
copper
steel
In compact porous soil, the rising of the water is due to
capillarity
cohesion
adhesion
viscosity
The number of galaxies that are visible without telescope on clear dark nights and away from bright lights is
one
two
three
infinite
The filament lamp is an example for
fluorescence
incandescence
both (a) and (b)
None of these
Out of the following which element has the longest half-life period?
Radium
Radon
Uranium-238
Plutonium
A rheostat is used
to increase the current flow in a circuit
to decrease the current flow
to measure the flow of electric current
Either (a) or (b) above
Photo-electric cells convert
electrical energy into light energy
light energy into electrical energy
light energy into heat energy
electrical energy into heat energy
In very cold countries alcohol is used as a thermometric liquid because
alcohol is a poor conductor of heat
alcohol can be coloured for its level to be seen easily
its freezing point is very low
it will not stick to the glass tube
Separating particles from a suspension is effected by
centrifugal force
frictional force
gravitational force
distillation
The device used to record the sound is
a microphone
a headphone
a phonograph
an amplifier
The Space Application Centre for training in Satellite Communication Technology is located at
Bangalore
Mumbai
Ahmedabad
New Delhi
The strength of an electromagnet can be increased by
increasing the length of the coiled wire
increasing current supply
increasing the size of the iron core
All the above
An electric charge is measured in
coulomb
ampere
volt
watt
Halley's comet appears in the heavens once in
40 years
50 years
76 years
80 years
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
To produce beats it is necessary to have two waves
travelling in opposite direction
of slightly different frequencies
of equal wavelength
of equal amplitude
We see the sun before it actually rises on the horizon. This is due to
refraction
reflection
total internal reflection
parallax
If a body is taken from the earth to the moon
both its mass and weight will be different
its mass will be different but the weight will remain the same
its mass and weight will both remain unchanged
its mass will remain the same but weight will be different
If an object is placed between two parallel plane mirrors, the number of images formed will be
1
infinite
0
4
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
Besides protons, the nucleus of an atom contains
electrons
neutrons
neutrons and electrons
electrons, neutrons and other particles
Hot water is poured simultaneously in four metallic tumblers painted outside with different paints. After some time the water will be found to have cooled most in the tumbler painted.
rough white
rough black
shining white
shining black
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
In the electrical circuit of a house the fuse acts as
a thermopile
a load
a step down device
a safety device
While crossing a suspension bridge, the soldiers are ordered to break steps because
the marching in steps will involve a big strain on them
the resonant vibrations caused by their marching can damage the bridge increasing the amplitude to dangerous proportions
the marching may obstruct other traffic
rumblings of their marching may disturb the surroundings