one
two
three
infinite
C. three
Proxima Centauri
Sirius
Aldebaran
Vega
its momentum is halved
its kinetic energy is halved
its acceleration is halved
its potential energy is halved
the quantity of heat energy in a body
thermal radiations quantitatively
high temperature
the intensity of sound
glass allows the heat radiations of shorter wavelengths from the sun to pass through
the plants absorb them - these shorter wavelengths - and reradiate them in the form of longer wavelengths
the longer wavelengths cannot penetrate through the glass walls
All the above
212°
32°
-40°
0°
work is done against gravity
the steepness of the staircase isn't felt
gravity assists
there is no friction between the legs and steps
travelling in opposite direction
of slightly different frequencies
of equal wavelength
of equal amplitude
Rutherford
Neils Bohr
Albert Einstein
JJ Thompson
short sight
long sight
astigmatism
presbyopia
look like falling stars
are really pieces of rock or metal
burn up as they shoot through the air
All the above
the telephone ear piece
the telegraph
the electric bell
All the above
Thumba
Delhi
Mumbai
Sriharikota
placing it inside a solenoid through which an alternating current is flowing
heating the magnet to redness and then allowing it to cool
dropping it several times or hammering it while lying east-west
All the above
one
two
three
infinite
at the lower elevation than the bird
at a higher elevation than the bird
in the same direction as the bird
vertically upwards
U-234
U-235
U-238
Both (b) and (c)
a planet
a meteor
a star
a comet
reverberate
be heard by us faintly
be heard upto 10 km from it
not be heard at any distance at all from it
a convex mirror behind it
a concave lens behind it
a concave mirror in front of it
a concave mirror behind it
goes straight through without bending
gets deviated away from the normal
gets bent towards the normal
gets reflected
decreases
increases
remains the same until all the ice has melted and then increases
remains the same
Voltmeter
Voltameter
Ammeter
Potentiometer
for automatically maintaining a steady temperature
for measuring electricity
to reduce the voltage of electricity
for producing heat
deflected by electric field
deflected by magnetic field
slightly deflected by electric field and magnetic field
not deflected by electric and magnetic fields
equal to half its focal length
equal to its focal length
twice its focal length
not related to its focal length
Sir Isaac Newton
Kepler
Copernicus
Ptolemy
in the live wire
in the neutral wire
in the earth wire
anywhere
Mercury
Venus
Moon
Mars
used by warships and military aircraft to locate enemy submarines
used by ships to determine the depth of water beneath them
a detective device that uses sound to locate under - water objects
All the above
pouring ice cold water into the inner tumbler
pouring ice cold water on the outer tumbler
pouring hot water into the inner tumbler
dipping both the tumblers in hot water