In the case of bodies falling under gravity which of the following remains constant at a given place?
kinetic energy
potential energy
acceleration
All the above
Correct Answer :
C. acceleration
Related Questions
Solids have definite shapes. This is because
the forces of cohesion of the molecules within are very much less in them
the forces of cohesion are very large
the forces of adhesion are large
the forces of adhesion are less
The presence of impurities
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
The source of electric energy in an artificial satellite is
mininuclear reactor
a dynamo
a thermopile
solar cells
Water has maximum density at
0° C
-15° C
4° C
15° C
Separating particles from a suspension is effected by
centrifugal force
frictional force
gravitational force
distillation
No current will flow between two charged bodies if they have the same
resistance
charge
potential
charge/potential ratio
Out of the following which is an insulator?
Silver
Copper
Nichrome
Dry wood
The method used to separate aluminium from a alumina is
electroplating
electrotyping
electrolysis
distillation
The cell that can be recharged, after it has run down, by passing a direct current through it from a source of current is
Voltaic cell
Leclanche cell
Dry cell
An accumulator
Rain drops acquire spherical shape due to
viscosity
surface tension
friction
elasticity
The rate of cooling of a hot body depends on
the nature of the radiating surface
area of the radiating surface
temperature difference between the body and the surroundings
All the above
The difference between planets and stars is
planets do not have light of their own whereas stars shine by their own light
planets do not twinkle like stars
planets are much smaller than stars
All the above
The method used to separate aluminium from a alumina is
electroplating
electrotyping
electrolysis
distillation
At what temperature do the Fahrenheit and Celsius scales give the same reading?
212°
32°
-40°
0°
The heating element often used in an electric iron is
copper
tungsten
mica
nichrome
A permanent magnet may be demagnetised by
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
The filament lamp is an example for
fluorescence
incandescence
both (a) and (b)
None of these
When we tighten the string of a sitar or tanpura its pitch
remains the same
increases
decreases
None of the above
Before the invention of geostationary satellites, television stations could not transmit their programmes to far off places because
these signals are electromagnetic in nature
these are not electromagnetic in nature
their wavelength is very large
they are not reflected by the ionosphere but pass through it
Hot water is poured simultaneously in four metallic tumblers painted outside with different paints. After some time the water will be found to have cooled most in the tumbler painted.
rough white
rough black
shining white
shining black
On the Kelvin scale, the melting point of ice is
0 K
273 K
373 K
100 K
Rain drops acquire spherical shape due to
viscosity
surface tension
friction
elasticity
Nuclear fission process means
absorption of a neutron by a nucleus
breakup of the nucleus of a heavy atom into two nearly equal halves emitting two or three neutrons and releasing large amounts of nuclear energy in the process
the scattering of neutrons
formation of heavier nucleus
The barometer was invented by
Michael Faraday
Torricelli
Thomas Alva Edison
Benjamin Franklin
When sound waves travel from one medium to another, the quantity which remains unchanged is its
speed
frequency
wavelength
All the above
For an electron orbiting in a hydrogen atom, the necessary centripetal force keeping it in orbit is provided by
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
The planet with the reddish tinge is
Jupiter
Mars
Mercury
Saturn
Which force is used when milk is churned to separate cream?
cohesive
centrifugal
frictional
gravitational
Out of the following, name the fluorescent substance.
quinine sulphate solution
paraffin oil
fluorescein solutions
All the above
The colour or an opaque object is due to the colour it
absorbs
refracts
reflects
scatters