The freezer in a refrigerator is placed near the top
to keep it away from the hot compressor which is near the bottom
because of convenience
so that it can cool the whole interior by setting up convection currents
to prevent too much cooling
Correct Answer :
C. so that it can cool the whole interior by setting up convection currents
Related Questions
We see the sun before it actually rises on the horizon. This is due to
refraction
reflection
total internal reflection
parallax
Which of the following is not electromagnetic waves?
heat waves
sound waves
radio waves
light waves
Atoms which have the same atomic number but different mass numbers are called
isobars
isomers
isotones
isotopes
The heating element often used in an electric iron is
copper
tungsten
mica
nichrome
Pyrometers are instruments used
for measuring the velocity of wind
in the manufacture of fireworks
in finding the coefficient of apparent expansion of a liquid
for measuring high temperatures
A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching the sides or touching the bottom of the bucket. The reading of the spring balance
will increase
will decrease
does not change
varies with the increase of depth of the immersion of the iron piece
Cyclotron is an apparatus used
as an accelerator for imparting energies to charged particles of atomic magnitudes
to reduce the charge on a particle
to produce intense magnetic field
to produce intense electrical field
Rain drops acquire spherical shape due to
viscosity
surface tension
friction
elasticity
The speed of sound in air at 0° C is approximately
4 x 108 m/s
1500 m/s
330 m/s
500 m/s
When water is cooled from 4�C to 2�C its density
increases
decreases
remains the same
first increases then decreases
In the electrical circuit of a house the fuse acts as
a thermopile
a load
a step down device
a safety device
When an electric bulb breaks, there is an explosive sound. That is due to
the chemical reaction between the gases inside the bulb
the compressed gases inside rushing out suddenly
the air outside rushing in to fill the vacuum inside the bulb
None of the above
When a swing is drawn to a side Its potential energy In relation to the earth
increases
decreases
remains the same
is constant
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
Antiparticle of electron is
proton
antiproton
positron
neutron
Air pressure is usually highest when the air is
warm and moist
cool and dry
warm and dry
cool and moist
The Space Application Centre for training in Satellite Communication Technology is located at
Bangalore
Mumbai
Ahmedabad
New Delhi
The mixing up of two gases as a result of random motion of molecules is called
diffusion
effusion
vaporisation
sublimation
Radio waves sent out by radio stations are reflected by
troposphere
stratosphere
mesosphere
ionosphere
Of the following which has got the highest frequency?
ultraviolet rays
gamma rays
radio waves
infrared waves
Commonly used safety fuse wire is made of
Tin
Lead
Nickel
An alloy of tin and lead
A thermostat is a device used
for automatically maintaining a steady temperature
for measuring electricity
to reduce the voltage of electricity
for producing heat
A body has fallen from a height. Just before touching the pound it has
lost all its potential energy and gained an equivalent amount of kinetic energy
gained potential energy and lost kinetic energy
gained kinetic energy as well as potential energy
lost kinetic energy as well as potential energy
The escape velocity of a satellite projected from the surface of the earth is independent of
the mass of earth
the mass of the satellite
the radius of the earth
gravitation of the earth
A tube light works on the principle of
chemical, heating and magnetic effects of electricity
discharge of electricity through gases
the action of ultraviolet radiation on certain fluorescent materials
Both (b) and (c) above
Which of the following is wrongly matched?
electric current - ampere
resistance - Ohm
electric power - volt
electric charge Coulomb
If you want to open a door with les difficulty you push it
at the middle
at a point away from the hinge (near the rim)
near the hinge
None of the above
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convex mirrors
concave mirrors
convex lens
concave lens
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
In a freezer ice cubes will be formed more quickly in trays made of
rubber
plastic
aluminium
wood