Solids have definite shapes. This is because
the forces of cohesion of the molecules within are very much less in them
the forces of cohesion are very large
the forces of adhesion are large
the forces of adhesion are less
Correct Answer :
B. the forces of cohesion are very large
Related Questions
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
The enormous energy released in nuclear and thermonuclear reactions is due to conversion of
chemical energy into heat energy
mechanical energy into heat energy
protons into neutrons
mass into energy according to Einstein's equation
The Milky Way is
the path of a star which is nearest to the earth
a galaxy which includes the sun
a star that is nearest to the earth
None of these
Radio waves sent out by radio stations are reflected by
troposphere
stratosphere
mesosphere
ionosphere
Rays similar to X-rays but of smaller wave length that are given off by radioactive substances are
�± -rays
�² -rays
�³ -rays
Cosmic rays
The motion .of the pendulum of a wall clock is an example of
linear motion
vibratory motion
rotational motion
None of the above
A hydraulic brake in an automobile uses
a fluid to transmit the braking force
the force applied by the driver
hydrogen gas and not any liquid
a vacuum brake
The study of astronomy include a
astrology
astrophysics
astrometry
Both (b) and (c) above
The heating element often used in an electric iron is
copper
tungsten
mica
nichrome
Choose the correct answer
Microphone converts sound energy into electrical energy.
Electric fan converts electrical energy into mechanical energy.
Battery converts chemical energy into electrical energy.
All the above
Alpha particles are
electromagnetic radiations
helium nuclei
negatively charged particles
neutral particles
The radius of an atom is approximately
10-10 cm
10-12 cm
10-13 cm
10-16 cm
The enormous energy released in nuclear and thermonuclear reactions is due to conversion of
chemical energy into heat energy
mechanical energy into heat energy
protons into neutrons
mass into energy according to Einstein's equation
Pieces of camphor placed on water move about rapidly. This is because of
diffusion
viscosity
surface tension
capillarity
The instrument used to measure atmospheric pressure is
Pyrometer
Eudiometer
Barometer
Hydrometer
Which physical quantity is measured in watts
power
kinetic energy
momentum
impulse
Light from the sun reaches the earth in
2 minutes
4 minutes
12 minutes
8 minutes
When two similar sources vibrate with slightly different frequencies, a regular rise and fall occurs in the loudness of tone. This phenomenon Is known as
doppler effect
beats
resonance
echo
To get 5 images of a single object one should have two plane mirrors inclined at an angle of
72°
60°
36°
90°
Powder clings to the skin because of
cohesion
adhesion
capillary action
absorption
The resistance of a wire depends on
the material of the wire
the length of the wire
the cross section of the wire
All the above
The device for tracking and locating the position of a moving object in space is called
Space ship
Lunar module
Radar
Rocket
When an incident beam of light strikes the surface of a glass slab normally, the refracted beam
goes straight through without bending
gets deviated away from the normal
gets bent towards the normal
gets reflected
In experiments on static electricity the standard method for obtaining small amounts of positive electricity is to rub
a glass rod with flannel
an abonite rod with flannel
a glass rod with silk
Any of the above
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
The heating element often used in an electric iron is
copper
tungsten
mica
nichrome
The temperature, surface features, length of days and nights of a planet depend on
its atmosphere
its distance from the sun
its rotation
All the above
When a body Is taken to the poles from the equator, Its weight becomes
greater
less
the same
None of these
Among the following the most suitable material for the core of an electro-magnet is
steel
wood
soft iron
copper
The device used to record the sound is
a microphone
a headphone
a phonograph
an amplifier