Veto q&a 7 Month22 (1)

@three faces
Q Caesium compound used in drilling fluids for the
extractive oil industry
A. Caesium formate
Q Caesium vapour is used in
A. Magnetometers
Q The Carbonate which is highly soluble in water
A. Caesium Carbonate
Q Francium was discovered and first isolated by
A. Marguerite percy
Q The largest metal atom present in the periodic table
A. Francium
Q Most stable isotope of Francium is
A. francium - 223
Q & A No@sea
Flame colour of Alkali Metals
Lithium - Crimson red (Bright red)
Sodium - Yellow
Potassium - Violet
Rubidium - Dark red
Caesium - Blue
rInGs ArOunD tHe sun
Q Scientific study of light
A. Optics
Q What is the speed of light in air or vacuum
Q What is light year
A. 3x10 8 m/s (3 lakh km/sec)
A. Distance travelled by light in one year
Q Order of speed of light
A. Water < glass < air < vacuum
Q Units used for measuring distance between the stars
A. Light year
• 1 Light year = 9.4608 x 10 12 km
• 1 Par sec = 3.26 light year
Q The distance between sun and earth is generally
expressed in
A. Astronomical Unit
Q Wavelength of visible light
A. 400 to 700 nanometer
Q Time taken by the sunlight to reach the earth
A. 8 minutes 20 seconds (500 sec)
Q Time taken by the moon light to reach the earth
A. 1.3 sec
Q Light which is emitted and absorbed in tiny particles
called
A. Photons
Q Substances which do not pass light through them
are called
A. Opaque substances
eg:- wood, paper, stone
Q Substances which allow light to pass through them
are called
A. Transparent substances
Eg:- glass
Q Wave theory of light was proposed by
A. Christian Hygens
Q Electro magnetic theory of light was proposed by
A. James Clark Maxwell
Q ‘The Corpuscular theory’ related to light was
proposed by
A. Isaac newton (1675)
Q&A Colours
Colour with minimum wavelength
Colour with maximum wavelength
Colour with minimum frequency
Colour with maximum frequency
Colour used in scientific laboratory
Colour used as danger signal
Colour which is sensitive to human eye
kAS
TipTop
Violet
Red
Red
Violet
Yellow
Red
Yellow
56
Q&AUbdn current affairs & gk
January 2018