The SI unit of electric current is
the ampere
the volt
the ohm
the coulomb
Correct Answer :
A. the ampere
Related Questions
The unit of power in SI is
Joule
Newton
Joule/Sec
Erg/Sec
Thick brick walls are used in the construction or a cold storage because bricks
are good conductors of heat
are cheaper
are easily obtained
are bad conductors of heat
Photocells are used
in burglar alarms
in automotive devices for light switches
television cameras
All the above
The speed of sound in a medium depends upon the properties of the medium such as
its density
its temperature
its elasticity
All the above
Echoes are produced by
the reflection of sound waves
the refraction of sound waves
the interference of sound waves
reverberation of sound waves
'Acoustics' is a branch or study dealing with
historical sites
architecture
sound
trigonometry
If a man wants to hear clearly the echo of a sound produced by him from a hill, the hill should be away from him by a minimum distance of
330 m
33 m
16.5 m
165 m
Tap water is placed in an open pad and allowed to evaporate. After some time the temperature of water
increases to a great extent
increases slightly
decreases slightly
decreases rapidly
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 focal length or lens or the eye is under the control or the
iris
pupil
ciliary body
cornea
Alpha particles are
electromagnetic radiations
helium nuclei
negatively charged particles
neutral particles
In a refrigerator, the refrigerant is
Nitrogen
Oxygen
Chlorine
Freon
The Space Application Centre for training in Satellite Communication Technology is located at
Bangalore
Mumbai
Ahmedabad
New Delhi
Radio waves sent out by radio stations are reflected by
troposphere
stratosphere
mesosphere
ionosphere
The sun continuously produces an enormous amount of energy. This is due to
nuclear fission
nuclear fusion
chemical combustion
boiling
Resistance is measured in
Volts
Amperes
ohms
coulombs
The property of a fluid by which it resists relative motion within itself is known as
cohesive force
surface tension
diffusion
viscosity
The solar wind is composed of
outward stream of protons and electrons on the surface of the sun during solar flares and sun-spot activity
plasma
ionized gas
All of these
Who first established the fact that the earth revolves round the sun?
Sir Isaac Newton
Kepler
Copernicus
Ptolemy
Body A is kept in contact with body B. Heat will flow from A to B if
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
When water is cooled from 4�C to 2�C its density
increases
decreases
remains the same
first increases then decreases
A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be
a parabola
a horizontal straight line
a vertical straight line
a circle
The speed of sound in a medium depends upon the properties of the medium such as
its density
its temperature
its elasticity
All the above
Compared to the atomic bomb, the destructive power of a hydrogen bomb is
greater
less
equal
can't be determined
In a river, the currents are fastest where the river la
wide and shallow
narrow and shallow
wide and deep
narrow and deep
Why is nuclear fusion also known as thermonuclear reaction?
Fusion converts nuclear energy into heat
Fusion demands conditions of extremely high temperature to produce it
Fusion produces large amount of heat
Fusion reactions takes place in the sun
When a swing is drawn to a side Its potential energy In relation to the earth
increases
decreases
remains the same
is constant
A radio set that uses valves does not start operating immediately when it is switched on whereas a set containing only tranaistors operates immediately. The reason for this is that
the valve filaments have low resistance
valve-radio sets work at a higher voltage
transistor set has a low resistance
filaments of the valves cake time to beat up and function
Like magnetic poles
attract each other
repel each other
neither attract nor repel
attract or repel depending upon the conditions
Sound waves
are electromagnetic waves
can easily pass through vacuum
are always transverse waves
require a material medium for propagation