the curvature of earth limits the range of reception
the signals are weak
the signals are absorbed by air
the antennae are not powerful enough
A. the curvature of earth limits the range of reception
at the middle
at a point away from the hinge (near the rim)
near the hinge
None of the above
212°
32°
-40°
0°
the reflection of sound waves
the refraction of sound waves
the interference of sound waves
reverberation of sound waves
it is nearest to the moon
it is nearest to the sun
it is nearest to Pluto
it is farthest from the sun
about 75% of hydrogen
22% helium
traces of most other elements including oxygen, neon, carbon and nitrogen
All the above
lead
zinc
carbon
tin
increases as the square root of the absolute temperature
decreases with temperature
is independent of temperature
None of these
Mercury
Venus
Moon
Mars
in burglar alarms
in automotive devices for light switches
television cameras
All the above
a quantum of light energy
a quantum of matter
a positively charged atomic particle
another name for positron
Nebulae
Quasars
Meteors
Comets
velocity
momentum
acceleration
angular velocity
good conductor of heat
good conductor of electricity
bad conductor of electricity
Both (a) and (b) above
electricity may not leak
there may be smooth flow of electricity
a short circuit may be prevented
current may pass to the earth in case of a short circuit without doing any harm to the person
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
mercury
distilled water
alcohol
does not use any liquid
The Milky Way
Radio Galaxy
Andromeda Nebula
Magellanic Clouds
adhesion
cohesion
surface tension
capillarity
speed
frequency
wavelength
All 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
212°
32°
-40°
0°
increases
decreases
remains unchanged
first decreases then increases
1985
1957
1959
1960
0 K
273 K
373 K
100 K
8 minutes
4.3 years
12 seconds
24 hours
a parabola
a horizontal straight line
a vertical straight line
a circle
a microphone
a headphone
a phonograph
an amplifier
umbra
penumbra
image
black portion of light
12N
2N
10N
6N
the ionised hydrogen molecule
the nucleus of helium atom
the nucleus of hydrogen atom
the positive counterpart of electron