A light sensitive device that converts drawing, printed text or other images into digital form is___________?
Keyboard
Scanner
OMR
None of these
What is the purpose of inserting wallpaper in Microsoft Word?
To add visual interest to the document
To adjust the page margins
To change the font style
To create page headers and footers
Which of the following is used as a lubricant?
Graphite
Silica
Iron oxide
Diamond
Which of the following was first to be discovered in the chromospheres of the sun?
Krypton
Xenon
Neon
Helium
The two elements that are frequently used for making transistors are :
Boron and aluminium
Silicon and Germanium
Iridium and Tungston
None of these
Permanent hardness of water can be removed by adding __________?
Chlorine
Washing soda
Bleaching powder
None of these
In fireworks,the green flame is produced because of __________?
Sodium
Barium
Mercury
Potassium
Lingxi-03, developed by Galaxy Space, was launched using a ___________ carrier rocket.
Long March-3D
Long March-2D
Vertical March-3D
Orbital March-2D
When in the part of its orbit closest to the Sun, Pluto has an atmosphere of nitrogen and methane similar to Triton';s, but what happens when it is farther from the Sun ?
These gases are not present
These gases are like plasma
These gases are frozen
These gases are volatile
Titan, a moon of __________ , and Triton, a moon of _________ , have atmospheres mainly of _________.
Saturn, Jupiter, Hydrogen
Uranus, Neptune, Nitrogen
Saturn, Neptune, Nitrogen
Mars, Venus, Hydrogen
The planet retains an atmosphere when?
Gravity is low and temperature of atmosphere is great
Gravity and temperature both are great
Gravity and temperature both are constant
Gravity is great and temperature of atmosphere is low
Atmospheric pressure is the force (per unit-area) perpendicular to a unit-area of planetary surface, as determined by _________.
Mass of vertical column of atmospheric gases
Mass of horizontal column of atmospheric gases
Weight of vertical column of atmospheric gases
Mass of vertical and weight of horizontal of atmospheric gases
___________ begins at 690 to 1,000 km from the surface, and extends to roughly 10,000 km.
Troposphere
Mesosphere
Exosphere
Stratosphere
Which of the following is true about Ionosphere?
Its density is lesser at short distances from planetary surface in morning and further decreases as ionosphere rises at night-time, thereby allowing a greater range of radio frequencies to travel greater distances
Its density is greater at short distances from tplanetary surface in daytime and decreases as ionosphere rises at night-time, thereby allowing a greater range of radio frequencies to travel greater distances
Its density is greater at long distances from planetary surface in daytime and further increases as ionosphere rises at night-time, thereby allowing a greater range of radio frequencies to travel greater distances
None of the above
Atmosphere is held in place by?
Pressure of the planetary body
Gravity of the planetary body
Charge of the planetary body
Heat of the planetary body
The thermosphere extends from an altitude of ________ to the base of ________ at ________?
75 km, Mesosphere, 670 km
80 km, Ionosphere, 680 km
85 km, Exosphere, 690 km
90 km, Ozone Layer , 690 km
_________ is the layer wherein most meteors are incinerated before reaching the surface.
Troposphere
Stratosphere
Mesosphere
Ionosphere
The mesosphere ranges from ________ to _________?
46 km to 85 km
48 km to 85 km
50 km to 85 km
52 km to 85 km
Stratosphere is the atmospheric layer that absorbs most of __________ that Earth receives from the Sun.
Infrared radiation
Ultraviolet radiation
Ozone layer
Radio waves
_________ is the atmospheric layer that absorbs most of the ultraviolet radiation that Earth receives from the Sun.
Troposphere
Stratosphere
Mesosphere
Ionosphere
Stratosphere is present at an altitude between _________.
15 km and 35 km
17 km and 35 km
18 km and 35 km
19 km and 35 km
_________ extends from the top of the troposphere to the bottom of the mesosphere.
Thermosphere
Ionosphere
Stratosphere
None of the above
The height of the troposphere varies between ____________.
7 km at equator and 17 km at poles
17 km at equator and 7 km at poles
18 km at equator and 8 km at poles
8 km at equator and 18 km at poles
____________ contains 75–80 % of the mass of the atmosphere.