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⭐️raj vigya > ras pre science one liners by mukta rao pt 1 > Flashcards

ras pre science one liners by mukta rao pt 1 Flashcards

1
Q

who discovered the light spectrum

A

newton

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2
Q

who discovered the phenomenon of scattering of light

A

cv raman

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3
Q

when was the phenomenon of scattering of light discovered

A

on 28 feb 1928 by cv raman

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4
Q

which day is observed on 28 feb and why

A

science day
on 28 feb 1928 cv raman discovered scattering of light phenomenon

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5
Q

which light scatters most and least

A

max violet
min red

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6
Q

why are the danger signs red

A

red scatters the least

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7
Q

how tall a mirror would be needed for a complete image

A

half of the height of object

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8
Q

near sightedness name

A

myopia

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9
Q

far sightedness name

A

hypermatopia

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10
Q

which lens is used in myopia

A

concave

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11
Q

which lens is used in hypermatopia

A

convex

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12
Q

where is image formed in myopia

A

before retina thus concave pushes the image forward

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13
Q

where is image formed in hypermetropia

A

after retina thus convex pulls it forward

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14
Q

uses of convex mirror?

A

rearview mirror
mirror to check bottoms of vehicles
street lamps

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15
Q

uses of concave mirror

A

zooming property thus saloons for shaving or dentists

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16
Q

formula for salt

A

NaCl aka sodium chloride

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17
Q

which compound is used in powder or cosmetics or ointments

A

zinc chloride ZnCl2

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18
Q

which compound is used for artificial rain

A

AgI silver iodide

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19
Q

which compound is used for voting marker ink

A

silver nitrate AgNO3

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20
Q

why shouldn’t egg be eaten with a silver spoon

A

sulphur in egg could react with silver and form AgS which is poisonous and also destroys the silver of spoon

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21
Q

the 22K gold used for ornaments has what added to gold

A

either silver or copper

22
Q

which gas is used in tubelights

A

mercury gas + argon (Ar)

23
Q

formula for bleaching powder

A

CaOCl2

24
Q

plaster of paris formula

A

(CaSO4)2.H2o

25
Q

formula for gypsum

A

(CaSO4).2H2O or CaSO4.2H2o

26
Q

formula for heavy water

A

D2O

27
Q

uses of hydrogen peroxide

A

for cleaning wounds and bleaching

28
Q

formula for baking soda

A

sodium bicarbonate i.e NaHCO3

29
Q

what is the composition of brass

A

30%Zn and 70%Cu

30
Q

what is the composition of bronze

A

Cu+Sn (tin and copper)

31
Q

what is the composition of german silver

A

Zn+Ni+Cu

zinc nickel copper

NO SILVER

32
Q

composition of steel

A

iron+cromium+nickel

33
Q

what is present in permanent hardness of water

A

sulphate and nitrate salts of calcium and magnesium

34
Q

what is present in temporary hardness of water

A

bicarbonates of calcium and magnesium

35
Q

which acid is vinegar or pickles

A

acetic acid CH3COOH

36
Q

which element is used in solar cell

A

cesium

37
Q

which compound is table sugar

A

sucrose C12H22O12

38
Q

soda water is?

A

carbonic acid H2CO3

thats why they are called carbonated drinks

39
Q

acid in grapes?

A

tartric acid

also used in making namkeen

40
Q

electric conductance descending order for following:
copper
aluminium
silver
tungsten

A

silver max
cu
al
tn

41
Q

which acid is produced in stomach for digestion of food

A

HCl

42
Q

what happens to make milk go sour

A

lactose sugar is converted to lactic acid

43
Q

pH of blood?

A

7.4

44
Q

where is gravity max and min on earth

A

max at poles (apprx 10 m/s2)
min at equator

45
Q

how much the rotation of earth needs to be increased for gravity to become zero

A

17 times

46
Q

what is the weight felt by an object during free fall

A

none
free

47
Q

who gave rules for planetary speeds

A

Johannes Kepler

48
Q

what is the speed of satellite on polar route

A

08km/second

49
Q

in how much time a polar route satellite completes one revolution around earth

A

1.24 hours

50
Q

distance of a geostationary satellite from surface is

A

36000 km

51
Q

what is the direction of revolution of a geostationary satellite

A

same as earth i.e. west to east

⭐️raj vigya (23 decks)

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