will increase
will decrease
does not change
varies with the increase of depth of the immersion of the iron piece
A. will increase
their heat contents
their masses
their temperatures
whether they are in solid, liquid or gaseous state
at the lower elevation than the bird
at a higher elevation than the bird
in the same direction as the bird
vertically upwards
cohesive
centrifugal
frictional
gravitational
viscosity
surface tension
friction
elasticity
the electrical attraction between the negatively charged electron and the positively charged porton
the high speed of the electron
the low speed of the electron
gravity
it is pleasing to the eye
it has a traditional colour
it is easily distinguishable
it is most sensitive to the human eye
similar charges of electricity rush towards each other and then get repelled
clouds strike against impurities in air and the friction burns up these impurities
strong opposite charges in different clouds break down the resistance offered by the intervening air
water vapour produces electricity in the clouds
Marconi
Oersted
Faraday
Ohm
Sir Isaac Newton
Columbus
Archimedes
Thomas Alva Edison
neutrons
electrons
phonons
photons
Sound energy from his mouth is then directed in one direction
The cupped hand acts as a cardboard tube of short length
The pitch of sound increases
Both (a) and (b)
convex mirrors
concave mirrors
concave lenses
lenses irrespective of types
resistor
thermocouple
light bulb
neon tube
inertia
adhesion
cohesion
friction
Albert Einstein
Enrico Fermi
HJ Bhabha
Sir Isaac Newton
greater
less
equal
can't be determined
increases
decreases
neither increases nor decreases
first increases then decreases
Silver
Copper
Nichrome
Dry wood
light travels very much faster than sound
sound travels faster than light
lightning occurs nearer than thunder
both travel at the same speed
is real
is virtual
can be obtained on a screen
is slightly bigger than the object
chemical, heating and magnetic effects of electricity
discharge of electricity through gases
the action of ultraviolet radiation on certain fluorescent materials
Both (b) and (c) above
equal to its focal length
equal to its radius of curvature
equal to the reciprocal of its focal length (in metres)
equal to twice its focal length
Pyrometer
Eudiometer
Barometer
Hydrometer
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
in burglar alarms
in automotive devices for light switches
television cameras
All the above
It will go down
It will come up
It will remain at the same level
First it will go down and it will come up
to stabilise the voltage
to decrease the current supply
to increase the current supply
to prevent an unduly high current from passing through a circuit
enclosing it in a thick walled iron box
wrapping it with an insulator
by placing it inside a glass case
by surrounding it with fine copper gauze
electrical energy into heat energy
electrical energy into mechanical energy
mechanical energy into electrical energy
mechanical energy into heat energy
will increase
will decrease
will have no change
will either increase or decrease