Which physical quantity is measured in watts
power
kinetic energy
momentum
impulse
Correct Answer :
A. power
Related Questions
The maximum displacement of the particle in a mechanical wave motion is known as
amplitude
vibration
frequency
phase
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 planet that moves fastest around the sun is
Mars
Venus
Earth
Mercury
Metals are good conductors of heat because
they contain free electrons
their atoms are relatively far apart
their atoms collide frequently
they have reflecting surfaces
When are temperature resistance
increases
decreases
remains the same
first increases then decreases
The fact that two large ships travelling on close parallel courses in the same direction tend to move towards each other can be explained by
Bernoulli's principle
Magnetic properties of the ship's material
Newton's third law of motion
Earth's gravitational force
The planet that spins Caster than any other planet is
Saturn
Jupiter
Earth
Mercury
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
X-rays were discovered by
Wilhelm Roentgen
WO Coolidge
Henry Cavendish
William Watson
A cup of hot coffee is placed on a metal table in a room. By which of the following methods does it lose heat?
conduction and convection only
conduction and radiation only
convection and radiation only
conduction, convection and radiation
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 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
The maximum displacement of the particle in a mechanical wave motion is known as
amplitude
vibration
frequency
phase
The rings of Saturn were discovered by
Galileo
Bhaskara
Aryabhatta
Ptolemy
The heat generated in a conductor carrying current is proportional to
the resistance
the square of the current flowing through it
the time the current flows
All the above
Changing of one element into another element is known as
transmutation
fission
fusion
radioactivity
Two tumblers stuck together can be separated by
pouring ice cold water into the inner tumbler
pouring ice cold water on the outer tumbler
pouring hot water into the inner tumbler
dipping both the tumblers in hot water
The ozone layer absorbs
Cosmic rays
Infrared rays
All radiations of light
Ultra violet rays coming from the sun
A pair of stars that revolve round each other is
a neutron star
a binary star
a dwarf star
a polar star
The pressure of air at high altitude is less than the atmospheric pressure at the sea level. Hence the boning point of water at a hill top
is more than at sea level
is equal to that sea level
is less than at sea level
depends on the surrounding temperature
At what temperature do the Fahrenheit and Celsius scales give the same reading?
212°
32°
-40°
0°
In compact porous soil, the rising of the water is due to
capillarity
cohesion
adhesion
viscosity
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 focal length or lens or the eye is under the control or the
iris
pupil
ciliary body
cornea
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
When a bowler spins a ball, it changes its direction in the air. This is due to
turbulence caused by the wind
buoyancy of air
unequal pressures acting on it
sudden change in the direction of the wind
Frictional force acts in
the same direction as the motion
the opposite direction of the motion
all the directions
upward direction
Halley's comet appears in the heavens once in
40 years
50 years
76 years
80 years
Which of the following rays has the highest penetrative power?
a -rays
� -rays
? -rays
X-rays
In the ramous equation of Einstein E = mc2 , 'c' denotes.
velocity of sound
velocity of light
a constant factor
wavelength of light