When sound waves travel from one medium to another, the quantity which remains unchanged is its
speed
frequency
wavelength
All the above
Correct Answer :
B. frequency
Related Questions
If you want a sound proof room, the walls should be
able to refract the sound
good absorbers of sound
good reflectors of sound
All the above
The direction of heat flow between two objects depends on
their heat contents
their masses
their temperatures
whether they are in solid, liquid or gaseous state
Nichrome is used in electric heaters and irons because
it resists oxidation when red hot
its melting point is high
it has got 60 times the resistance of copper
All the above
The frequency of an ultrasonic wave is
the same as that of an audible sound
above the audible range
below the audible range
None of the above
Which of the following has the highest refractive index?
Crown glass
Water
Flint glass
Diamond
The theory that the earth constituted the centre of the universe around which the sun and the planets revolved was propounded by
Copernicus
Ptolemy
Newton
Kepler
When a steel ball is placed on the surface of mercury, it does not sink because
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
We see the flash of lightning before hearing the thunder because
light travels very much faster than sound
sound travels faster than light
lightning occurs nearer than thunder
both travel at the same speed
The earth's nearest neighbour in space is
the Sun
the Moon
the Venus
the Mars
The force that keeps a body in a circular motion la called
the centripetal force
the centrifugal force
the frictional force
All the above
The filament used in the electric lamp is made of
nichrome
tungsten
copper
aluminium
The nuclear model of atom was first visualised by
Rutherford
Neils Bohr
Albert Einstein
JJ Thompson
Which metal is used in storage batteries?
Copper
Lead
Tin
Iron
Enriched uranium means
Uranium that is very pure
Uranium in which the concentration of the isotope U-238 is more than in the naturally occuring uranium
Uranium in which the concentration of the isotope U-235 is more than in the naturally occuring uranium
None of the above
The temperature of a large bucket-full of hot water (a few degrees below boiling point) is lower than a beaker full of boiling water. But
the hot water contains a much larger quantity of internal energy than the boiling water
the boiling water contains more quantity of internal energy than the warm water
both of them have got the same amount of internal energy.
nothing can be said definitely with the data given
The speed at which light travels in vacuum is
3 x 107 ms-1
5 x 108 ms-1
3 x 104 kms-1
3 x 108 ms-1
The ballistic missile, Agni 11, tested by India has a maximum range of
1000 km
1500 km
2000 km
500 km
Resistance is measured in
Volts
Amperes
ohms
coulombs
The phenomenon of spontaneous disintegration of certain heavy nuclei is termed
radioactivity
fission
fusion
implosion
Which of the following has the highest refractive index?
Crown glass
Water
Flint glass
Diamond
When a swing la drawn to a side Its potential energy In relation to the earth
increases
decreases
remains the same
is constant
We always see only one side of the moon because
the sun comes in between the earth and moon
the moon is stationary
the time taken by the moon to rotate on its axis is the same as the time taken by it to revolve round the earth
moon revolves round the sun
When water is cooled from 4�C to 2�C its density
increases
decreases
remains the same
first increases then decreases
The colour or an opaque object is due to the colour it
absorbs
refracts
reflects
scatters
A pair of stars that revolve round each other is
a neutron star
a binary star
a dwarf star
a polar star
Which of the following can produce electricity?
resistor
thermocouple
light bulb
neon tube
The radius of curvature of a spherical mirror is
equal to half its focal length
equal to its focal length
twice its focal length
not related to its focal length
A transformer
converts direct current into alternating current
converts alternating current into direct current
steps up or steps down a given alternating current voltage
supplies current with zero resistance
The brightest star visible to the naked eye is
Sirius
Vega
Rigel
Proxima Centauri
A proton is
a quantum of light energy
a quantum of matter
a positively charged atomic particle
another name for positron