speed of sound is greater in steel than in air
speed of sound is greater in air than in steel
part of sound waves is reflected between rail tracks
the boy's ears are at a different distance from the source
A. speed of sound is greater in steel than in air
frequency is higher
wavelength is smaller
pitch is smaller
air is warmer
poor reflection from the mirrors
scattering of light from the mirrors
absorption of some light by the mirrors
absorption of light by the atmosphere
an indeterminate quantity
equal to the weight of the ship
greater than the weight of the ship
less than the weight of the ship
Parabolic
Convex
Concave
Plain
loudness
pitch
quality or timbre
All the above
the material of the wire
the length of the wire
the cross section of the wire
All the above
Irene Curie
W Bothe and H Becker
James Chadwick
Jean Joliot
red
violet
green
yellow
refraction of light from them through air
reflection
absorption
All the above
the time for the upward journey and downward journey are the same
the upward journey takes more time
the downward journey takes more time
Can't be said
Albert Einstein
Enrico Fermi
HJ Bhabha
Sir Isaac Newton
rectilinear propagation of light
reflection
refraction
total internal reflection
less than
greater than
equal to
greater than or equal to
the telephone ear piece
the telegraph
the electric bell
All the above
speed of sound is greater in steel than in air
speed of sound is greater in air than in steel
part of sound waves is reflected between rail tracks
the boy's ears are at a different distance from the source
its density being very high 13.6 g/cm3 the height of mercury column is conveniently small
at the ordinary temperature its vapour pressure is small
it is opaque and does not wet glass
All the above
a unit of time
a unit of length
a year of no consequence
illumination throughout the year
proton
neutron
electron
positron
sound energy is converted into electrical energy
electrical energy is converted into sound energy
sound energy is converted into mechanical energy
mechanical energy is converted into sound energy
necessary oxygen for burning of oil may be provided
the convection current of air may be maintained to keep the lamp burning
the brightness of the lamp may be increased
All the above
an indeterminate quantity
equal to the weight of the ship
greater than the weight of the ship
less than the weight of the ship
linear motion
vibratory motion
rotational motion
None of the above
a glass rod with flannel
an abonite rod with flannel
a glass rod with silk
Any of the above
the retina of the eye moves forward
the retina of the eye moves backward
c).the iris is unable to dilate the pupil immediately to be able to see things
the eye has no power of accommodation
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
is real
is virtual
can be obtained on a screen
is slightly bigger than the object
wide and shallow
narrow and shallow
wide and deep
narrow and deep
Marconi
Baird
John Bardeen, Walter H. Brattain and William Shockley
Edison
Mars
Venus
Earth
Mercury
generally considered as a desert happening
caused by unequal heating of the several layers of the atmosphere above the desert
in which the refracted rays take a curved path resulting in total internal refection
All the above