The audible range of a normal human ear is frequencies ranging from
10000 to 20000 Hz
50 to 15000 Hz
20 to 20000 Hz
15 to 50000 Hz
Correct Answer :
C. 20 to 20000 Hz
Related Questions
The function of a ruse wire is
to stabilise the voltage
to decrease the current supply
to increase the current supply
to prevent an unduly high current from passing through a circuit
The characteristics of a musical note are
loudness
pitch
quality or timbre
All the above
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 brightest planet in the Solar System is
Jupiter
Mercury
Venus
Sirius
A convex mirror always produces
an erect, virtual image of diminished size
an erect, real image of diminished size
an erect, real image of double size
a virtual image of double size
X-rays are
deflected by electric field
deflected by magnetic field
slightly deflected by electric field and magnetic field
not deflected by electric and magnetic fields
When ice just melts
there is no change in volume
there is no change in temperature
heat is given out
there is no change of state
Heat transfer
cools the body that transfers it
heats the body that absorbs the heat
may change the physical state of the substance
All the above
Every action has an equal and opposite reaction is Newton's law of Motion
first
second
third
fourth
Skating on ice is possible because
the surface of ice is smooth
ice is cold
the pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water
the pressure on the ice due to skate raises its melting point
The inability of a body to change its state of rest or uniform motion along a straight line is called its
momentum
velocity
acceleration
inertia
The asteroids belt lies between the orbits of
Earth and Mars
Venus and Earth
Mars and Jupiter
Moon and Mars
You want a supply of a small but constant current. Which of the following cells will you prefer?
Daniell cell
Leclanche cell
Dry cell
All the above
Which is the densest planet of the solar system?
Sun
Jupiter
Mercury
Earth
The cover of a solar cooker is made of glass because
it absorbs sun's rays
it reflects sun's rays
it retains the heat inside by the greenhouse effect
it radiates heat better than metals
The planet that spins Caster than any other planet is
Saturn
Jupiter
Earth
Mercury
No current will flow between two charged bodies if they have the same
resistance
charge
potential
charge/potential ratio
When a swing la drawn to a side Its potential energy In relation to the earth
increases
decreases
remains the same
is constant
Gamma radiations are used for
sterilising food stuff
controlling pests
cancer therapy
All of these
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
Which of the following can produce electricity?
resistor
thermocouple
light bulb
neon tube
If an empty cylinder Is half ruled with a liquid, Its centre of gravity is
shifted upwards
shifted downwards
shifted neither upward nor downward
shifted upward or downward depending on the density of the liquid
At temperature near OK, (zero kelvin) metals such as lead and tin become
insulators
semiconductors
superconductors
condenser
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
On applying a constant force to a mass, It moves with a uniform
velocity
momentum
acceleration
angular velocity
When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is
the violet ray
the red ray
the green ray
the blue ray
Ultrasonic waves are used
in medical and surgical diagnosis
in testing the quality of the linings and pads used in vehicles and aircraft brakes
to clean surgical instruments, jewellery and similar articles
All the above
If an object is placed between two parallel plane mirrors, the number of images formed will be
1
infinite
0
4
The rings of Saturn were discovered by
Galileo
Bhaskara
Aryabhatta
Ptolemy
A device used to measure heights above sea level is known as
altimeter
anemometer
dilatometer
potentiometer