Meteors
look like falling stars
are really pieces of rock or metal
burn up as they shoot through the air
All the above
Correct Answer :
D. All the above
Related Questions
The sun continuously produces an enormous amount of energy. This la due to
nuclear fission
nuclear fusion
chemical combustion
boiling
The velocity of sound in air
increases as the square root of the absolute temperature
decreases with temperature
is independent of temperature
None of these
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
Which metal is used in storage batteries?
Copper
Lead
Tin
Iron
Antiparticle of electron is
proton
antiproton
positron
neutron
If the speed of the rotation of the earth increases the weight of a body
will increase
will decrease
will have no change
will either increase or decrease
The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because
the ringing is not loud enough
the glass of the bell jar absorbs the sound waves
the bell jar is too small
there is no air or -any other gas in the bell jar
The planet that has got a well-developed set of rings is
Venus
Saturn
Mercury
Earth
The filament lamp is an example for
fluorescence
incandescence
both (a) and (b)
None of these
The coil of an electric heater is made of
Platinum
Tungsten
Nichrome
Copper
The largest reserve of radioactive element which can be used in a nuclear reactor has been found in India, The name of the element is
Thorium
Uranium
Plutonium
Radium
The end product in the uranium disintegration series is
lead
zinc
carbon
tin
The planet that has got a well-developed set of rings is
Venus
Saturn
Mercury
Earth
Which force is used when milk is churned to separate cream?
cohesive
centrifugal
frictional
gravitational
Photo-electric cells convert
electrical energy into light energy
light energy into electrical energy
light energy into heat energy
electrical energy into heat energy
For accurate scientific work, temperatures are often measured by
mercury thermometers
alcohol thermometers
platinum resistance thermometers
thermoelectric thermometers
The speed of light is minimum while passing through
air
glass
vacuum
water
Dioptre is the unit of power of
convex mirrors
concave mirrors
concave lenses
lenses irrespective of types
Isotones are species of atoms containing
same number of protons but different number of neutrons
same number of neutrons but different number of protons
the same total number of protons and neutrons
same number of protons and different number of electrons
A body has fallen from a height. Just before touching the pound it has
lost all its potential energy and gained an equivalent amount of kinetic energy
gained potential energy and lost kinetic energy
gained kinetic energy as well as potential energy
lost kinetic energy as well as potential energy
Sound travels fastest in
air
water
iron
vacuum
The instrument used to determine the RD (Relative Density) of a liquid by the principle of floatation is
Hygrometer
Hypsometer
Hydrometer
Densimeter
The line on earth's surface passing through the places having zero dip is called the magnetic equator. This passes through
Thumba
Delhi
Mumbai
Sriharikota
When we tighten the string of a sitar or tanpura its pitch
remains the same
increases
decreases
None of the above
An ammeter has
a high resistance
a very low resistance
no resistance at all
resistance of 400 � w
Out of the following which is an insulator?
Silver
Copper
Nichrome
Dry wood
The pressure of air at high altitude is less than the atmospheric pressure at the sea level. Hence the boning point of water at a hill top
is more than at sea level
is equal to that sea level
is less than at sea level
depends on the surrounding temperature
'Acoustics' is a branch or study dealing with
historical sites
architecture
sound
trigonometry
Photo-electric cells convert
electrical energy into light energy
light energy into electrical energy
light energy into heat energy
electrical energy into heat energy
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