Moon has no atmosphere because
it has no population
it is quite far off
its surface is full of rocks
its gravity is not sufficient for any atmosphere to hold on to it
Correct Answer :
D. its gravity is not sufficient for any atmosphere to hold on to it
Related Questions
Hot water is poured simultaneously in four metallic tumblers painted outside with different paints. After some time the water will be found to have cooled most in the tumbler painted.
rough white
rough black
shining white
shining black
In very cold countries alcohol is used as a thermometric liquid because
alcohol is a poor conductor of heat
alcohol can be coloured for its level to be seen easily
its freezing point is very low
it will not stick to the glass tube
The following are the atmospheric zones above the surface of the earth:
A) Troposphere
B) Ionosphere
C) Stratosphere
D) Exosphere
Select the correct sequence from the earth's surface on the basis of the codes given below:
ACBD
ABCD
CABD
BACD
Separating particles from a suspension is effected by
centrifugal force
frictional force
gravitational force
distillation
Which of the following revolves round the nucleus in an atom?
protons
electrons
neutrons
positrons
Which physical quantity is measured in watts
power
kinetic energy
momentum
impulse
Which of the following is not electromagnetic waves?
heat waves
sound waves
radio waves
light waves
A ship sailing from a river to the sea
sinks less in the sea
sinks more in the sea
neither sinks more nor less in the sea
sinking more or less depends on sea
The method used to separate aluminium from a alumina is
electroplating
electrotyping
electrolysis
distillation
The study of astronomy include a
astrology
astrophysics
astrometry
Both (b) and (c) above
The filament lamp is an example for
fluorescence
incandescence
both (a) and (b)
None of these
Sound waves in air are
transverse
longitudinal
transverse and longitudinal
neither transverse nor longitudinal
The colour of a star is an indication of its
distance from the earth
age
temperature
size
The focal length or lens or the eye is under the control or the
iris
pupil
ciliary body
cornea
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
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
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
Out of the following which element has the longest half-life period?
Radium
Radon
Uranium-238
Plutonium
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 acoustical quality of a room depends on
the size and shape of the room
the ability of the ceiling, walls and floor to exclude unwanted sound
the use of furnishings made of sound absorbing materials
All the above
Red Light is used as a dancer signal because
it is pleasing to the eye
it has a traditional colour
it is easily distinguishable
it is most sensitive to the human eye
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
Dioptre is the unit of power of
convex mirrors
concave mirrors
concave lenses
lenses irrespective of types
A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will
increase
decrease
remain unaffected
have its shape changed
The SI unit of electric current is
the ampere
the volt
the ohm
the coulomb
Who first established the fact that the earth revolves round the sun?
Sir Isaac Newton
Kepler
Copernicus
Ptolemy
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
Raindrops assume a spherical shape because or
adhesion
surface tension
gravitational force
atmospheric pressure from all sides
To get 5 images of a single object one should have two plane mirrors inclined at an angle of
72°
60°
36°
90°
Air escaping rapidly from a narrow orifice in an inflated tyre feels cool because
the speed with which it escapes cools it down
of the higher temperature of the surroundings
of sudden expansion causing loss of internal energy
there is no real fall in temperature