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⭐️raj vigya > ras pre science one liners by mukta rao part 2 > Flashcards

ras pre science one liners by mukta rao part 2 Flashcards

1
Q

what is the formula for pressure

A

force per unit area

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2
Q

if a barometer falls suddenly, what does it indicate for the environment

A

storm

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3
Q

if a barometer falls slowly, what does it indicate for the environment

A

rain

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4
Q

if a barometer increases , what does it indicate for the environment

A

clear sky

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5
Q

why does water boils late and food cooks slowly on mountains

A

low pressure

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6
Q

why does fountain pen leak in planes

A

low pressure

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7
Q

what kind of waves are sound waves

A

longitudinal waves

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8
Q

what is the audible range

A

20 hz to 20khz

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9
Q

how does the speed of sound varies in different mediums

A

highest in solid, then liq then gas
zero in vacuum

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10
Q

what is the speed of sound in air

A

332m/s

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11
Q

what is the 1 unit of domestic electricity

A

1KWH

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12
Q

what is the electric heater wire made with

A

nichrome (nickle-chromium)

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13
Q

what kind of connection is the household electricity connection

A

parallel connection

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14
Q

why are household electric connections parallel

A

for a constant 220v connection

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15
Q

why is electric current fatal to humans

A

because humans have high resistance around 16 ohms
current cannot pass through

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16
Q

egs of diamagnetic materials

A

zn
bismuth
cu
ag
au
diamond
salt
water

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17
Q

egs of ferromagnetic materials

A

platinum
cr
na
al
oxygen

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18
Q

uses of radioactivity

A

food irradication
uv light for killing germs
reflector strips on vehicles and jerseys

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19
Q

which elements are used in nuclear fission

A

uranium 235 and plutonium 239

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20
Q

egs of diluents

A

heavy water
graphite

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21
Q

control rod which absorbs extra nitrogen is made with

A

cadmium and boron

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22
Q

procedure to purify raw petroleum is called

A

dephlegmation

23
Q

what is dephlegmation

A

separating water from spirits and acids by evaporation or repeated distillation
mainly used to purify raw petroleum

24
Q

why is the green color in firecrackers

A

barium

25
Q

which metals are found in pure form on earth

A

ag
au
cu
platinum
bismuth

26
Q

what is known as white gold

A

platinum

27
Q

what is known as fool’s gold

A

iron pyrites

28
Q

who administered the first vaccine and for which disease

A

edward jenner on small pox

29
Q

who first did dna synthesis in lab

A

hargovind khurrana

30
Q

why is the red color of tomato

A

lycopene

31
Q

why is the red color of carrot

A

carotene

32
Q

why is the red color of beetroot

A

betanin

33
Q

why is the green colour of leaves

A

clorophyl

34
Q

which 4 acids are in DNA

A

adenin
guanin
thiamin
cytosin

35
Q

what is mission shakti

A

anti satellite missile tech to strike down alien satellites in our airspace

36
Q

when was the first successful test by DRDO for mission shakti

A

2019

37
Q

which countries had anti satellite missile tech before DRDO’s mission shakti for india

A

us
russia
china

38
Q

which is the main pollutant in cigarette smoke

A

benzene and carbon monoxide

39
Q

which is the carcinogen in cigarette smoke

A

benzene

40
Q

which acid causes swelling and itching due to insect bites

A

formic acid HCOOH

41
Q

how to neutralize insect bites

A

using basic solution like soda or shop against formic acid

42
Q

why is the odour in garlic or onion

A

sulphur

43
Q

why does oil become rancid in too long and expiry always should be checked

A

oxydation

44
Q

which cells can breathe anaerobically

A

yeast
muscle cells

45
Q

why do muscles ache after workout

A

lactic acid gets deposited in muscle cells

46
Q

excretion in fish content?

A

ammonia

47
Q

excretion in humans content?

A

urea

48
Q

what do birds and reptiles excrete

A

uric acid

49
Q

what are the two types of dialysis

A

hemodylisys
peritoneal dextrose based dialysis

50
Q

how is petroleum formed

A

because of ancient oceanic animals dying and succumbing to extreme pressure

51
Q

how is coal formed

A

forests when in permocarbonifrous period sunk into earth

52
Q

why petrol or diesel fire is not to be extinguished with water

A

water is heavier and settles under the fuel

53
Q

how do we stop a fuel fire

A

use co2 or sand to stop oxygen supply

⭐️raj vigya (23 decks)

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