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
Correct Answer :
C. the air outside rushing in to fill the vacuum inside the bulb
Related Questions
In the electrical circuit of a house the fuse acts as
a thermopile
a load
a step down device
a safety device
Halley's comet appears in the heavens once in
40 years
50 years
76 years
80 years
Why is it cool near an open pond on a hot summer day?
Evaporation at the surface causes cooling
The heat obsorbed at the surface is passed on to the bottom
Because of impurity in the water
Because of convection currents set up inside water
The nuclear model of atom was first visualised by
Rutherford
Neils Bohr
Albert Einstein
JJ Thompson
Increase in pressure
has no effect on the boiling point of a liquid
raises the boiling point of a liquid
lowers the boiling point of a liquid
increases the volume of a liquid
The transistor was invented by
Marconi
Baird
John Bardeen, Walter H. Brattain and William Shockley
Edison
Lightning conductors are made of
iron
chromium
copper
steel
Which mirror is used as a rear view mirror in Vehicles?
Parabolic
Convex
Concave
Plain
The Indian Space Research Organisation (ISRO) is located at
Thumba
Bangalore
Ahmedabad
New Delhi
When a body is projected upwards
the time for the upward journey and downward journey are the same
the upward journey takes more time
the downward journey takes more time
Can't be said
Which of the following pairs is not correct?
Television - Baird
Transistor ~ Shockley
Thermometer - Celsius
Barometer Torricelli
At what temperature do the Fahrenheit and Celsius scales give the same reading?
212°
32°
-40°
0°
No current will flow between two charged bodies if they have the same
resistance
charge
potential
charge/potential ratio
When we tighten the string of a sitar or tanpura its pitch
remains the same
increases
decreases
None of the above
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 velocity of sound in air
increases as the square root of the absolute temperature
decreases with temperature
is independent of temperature
None of these
An ohm is a unit of
potential difference
resistance
current
All the above
Heat is transmitted from one end of a metal rod to its other end by the method of
conduction
convection
radiation
sublimation
Powder clings to the skin because of
cohesion
adhesion
capillary action
absorption
Solar radiation is preferred to other sources of energy because
it is practically inexhaustible
it is the cheapest form of energy
it does not cause pollution
All of the above
The source of electric energy in an artificial satellite is
mininuclear reactor
a dynamo
a thermopile
solar cells
Like magnetic poles
attract each other
repel each other
neither attract nor repel
attract or repel depending upon the conditions
The inside of both the walls of a thermos flask is silvered i.e., on the vacuum side in order to reduce heat loss by
convection
radiation
conduction
All the three
The mirage is a phenomenon
generally considered as a desert happening
caused by unequal heating of the several layers of the atmosphere above the desert
in which the refracted rays take a curved path resulting in total internal refection
All the above
The ozone layer absorbs
Cosmic rays
Infrared rays
All radiations of light
Ultra violet rays coming from the sun
The brightest star visible to the naked eye is
Sirius
Vega
Rigel
Proxima Centauri
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
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 rings of Saturn were discovered by
Galileo
Bhaskara
Aryabhatta
Ptolemy
At what temperature do the Fahrenheit and Kelvin scales give the same reading?
212°
32°
-40°
0°