12N
2N
10N
6N
B. 2N
in air
in an atmosphere of oxygen
in an atmosphere of CO2
in vacuum
both its mass and weight will be different
its mass will be different but the weight will remain the same
its mass and weight will both remain unchanged
its mass will remain the same but weight will be different
able to refract the sound
good absorbers of sound
good reflectors of sound
All the above
1985
1957
1959
1960
10000 to 20000 Hz
50 to 15000 Hz
20 to 20000 Hz
15 to 50000 Hz
the heat content of A is greater than that of B
the temperature of A is greater than that of B
the specific heat of A is greater than that of B
the specific heat of B is greater than that of A
mercury thermometers
alcohol thermometers
platinum resistance thermometers
thermoelectric thermometers
meteors
binaries
variable stars
bright stars
greater than the weight of the man
less than the weight of the man
same as the weight of the man
zero
half
one fourth
four times
two times
adhesion
surface tension
gravitational force
atmospheric pressure from all sides
Voltaic cell
Leclanche cell
Dry cell
An accumulator
to increase the current flow in a circuit
to decrease the current flow
to measure the flow of electric current
Either (a) or (b) above
Pascal's law
Bernoulli's law
Archimedes' law
Boyle's law
it stops due to malfunctioning
it starts emitting dangerous radioactive radiations
it is shut down to avoid explosion
it is ready to produce controlled energy
an ammeter
a rheostat
a voltmeter
a voltameter
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
increases
decreases
remains the same
first increases then decreases
conduction
convection
radiation
sublimation
Rutherford
Bohr
Henri Bacquerel
Marie Curie
increases the melting point of ice
decreases the melting point of ice
has no effect on the melting point of ice
increases the volume of the ice
viscosity
surface tension
friction
elasticity
at the middle
at a point away from the hinge (near the rim)
near the hinge
None of the above
it has no population
it is quite far off
its surface is full of rocks
its gravity is not sufficient for any atmosphere to hold on to it
quality
amplitude
pitch
loudness
astrology
astrophysics
astrometry
Both (b) and (c) above
able to refract the sound
good absorbers of sound
good reflectors of sound
All the above
at the middle
at a point away from the hinge (near the rim)
near the hinge
None of 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
is found by measuring the slanting height of the mercury column
is given by the vertical height
cannot be measured with it
u) can be measured by both the methods described above