a parabola
a horizontal straight line
a vertical straight line
a circle
A. a parabola
turbulence caused by the wind
buoyancy of air
unequal pressures acting on it
sudden change in the direction of the wind
speed
frequency
wavelength
All the above
the square of the current
the resistance of the conductor
the time for which the current flows
All the above
about 75% of hydrogen
22% helium
traces of most other elements including oxygen, neon, carbon and nitrogen
All the above
for measuring relative density of liquids
by ships to pass on messages
for determining the depth of ocean bottoms etc.
by deaf people to aid hearing
cohesive forces between the mercury molecules are greater than adhesive forces between mercury and glass molecules
the adhesive forces between mercury and glass molecules are greater than the cohesive forces
both the cohesive and adhesive forces are equal
None of the above
look like falling stars
are really pieces of rock or metal
burn up as they shoot through the air
All the above
�± -rays
�² -rays
�³ -rays
Cosmic rays
they contain free electrons
their atoms are relatively far apart
their atoms collide frequently
they have reflecting surfaces
4 x 108 m/s
1500 m/s
330 m/s
500 m/s
power
kinetic energy
momentum
impulse
the mountains found on the surface of the Sun
the dark patches on the sun having less temperature than the normal sun's surface
ionized gas found near the solar surface
the magnetic storms on the surface of the Sun
viscosity
surface tension
friction
elasticity
cohesive force
surface tension
diffusion
viscosity
lowers the melting point of ice
raises the melting point of ice
has no effect on the melting point of ice
may lower or raise the melting point depending upon the type of impurities
frequency is higher
wavelength is smaller
pitch is smaller
air is warmer
virtual and upright
virtual and inverted
real and inverted
real and upright
resistance
charge
potential
charge/potential ratio
a microphone
a headphone
a phonograph
an amplifier
the resistance
the square of the current flowing through it
the time the current flows
All the 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
increasing the length of the coiled wire
increasing current supply
increasing the size of the iron core
All the above
Galileo
Bhaskara
Aryabhatta
Ptolemy
distance from the earth
age
temperature
size
a fluid to transmit the braking force
the force applied by the driver
hydrogen gas and not any liquid
a vacuum brake
of the surface tension of mercury
mercury is a semi-solid
of the high viscosity of mercury
the density of mercury is greater than that of steel
Television - Baird
Transistor ~ Shockley
Thermometer - Celsius
Barometer Torricelli
Earth and Mars
Venus and Earth
Mars and Jupiter
Moon and Mars
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
poor reflection from the mirrors
scattering of light from the mirrors
absorption of some light by the mirrors
absorption of light by the atmosphere