10-10 cm
10-12 cm
10-13 cm
10-16 cm
are electromagnetic waves
can easily pass through vacuum
are always transverse waves
require a material medium for propagation
Mercury
Venus
Moon
Mars
does not allow the lightning to fall on the building at all
drives away the charged clouds
forces the lightning to fall on other buildings near that building
conducts the electric charges to the ground when lightning strikes the building
for automatically maintaining a steady temperature
for measuring electricity
to reduce the voltage of electricity
for producing heat
increase
decrease
remain the same
None of the above
the mass number
atomic number
atomic weight
absolute number
increasing the length of the coiled wire
increasing current supply
increasing the size of the iron core
All the above
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
The Milky Way
Radio Galaxy
Andromeda Nebula
Magellanic Clouds
Cosmic rays
Infrared rays
All radiations of light
Ultra violet rays coming from the sun
refraction of light from them through air
reflection
absorption
All the above
can focus very rapidly as pictures change
is quicker than the brain
can see two images separated only if the interval' between seeing them is more than' one-tenth of a second
can shut out some of the light
as an accelerator for imparting energies to charged particles of atomic magnitudes
to reduce the charge on a particle
to produce intense magnetic field
to produce intense electrical field
a unit of time
a unit of length
a year of no consequence
illumination throughout the year
a reflecting elliptical portion
a reflecting spherical surface
a parabolic reflecting surface
a flat reflecting surface
is more than at sea level
is equal to that sea level
is less than at sea level
depends on the surrounding temperature
direct sun's rays
radiation from earth's surface
radiogenic heat (resulting from radioactive decay)
cosmic rays coming from space
1
infinite
0
4
goes straight through without bending
gets deviated away from the normal
gets bent towards the normal
gets reflected
a planet
a meteor
a star
a comet
is proportional to that of the Celsius thermometer
is always greater than that of the Celsius thermometer
is always less than that of the Celsius thermometer
may be greater than or less than or equal to that of the Celsius thermometer
able to refract the sound
good absorbers of sound
good reflectors of sound
All the above
Liquid ammonia
Carbon tetrafluoride
Dichloro-difluoro-methane
Sulphur dioxide
maximum at the equator
minimum at the equator
minimum at the poles
the same everywhere
a fluid to transmit the braking force
the force applied by the driver
hydrogen gas and not any liquid
a vacuum brake
light travels very much faster than sound
sound travels faster than light
lightning occurs nearer than thunder
both travel at the same speed
the chemical reaction between the gases inside the bulb
the compressed gases inside rushing out suddenly
the air outside rushing in to fill the vacuum inside the bulb
None of the above
ultraviolet rays
gamma rays
radio waves
infrared waves
the speed with which it escapes cools it down
of the higher temperature of the surroundings
of sudden expansion causing loss of internal energy
there is no real fall in temperature