ras pre science one liners by mukta rao part 2

Question 1

what is the formula for pressure

Answer 1

force per unit area

Question 2

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

Answer 2

storm

Question 3

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

Answer 3

rain

Question 4

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

Answer 4

clear sky

Question 5

why does water boils late and food cooks slowly on mountains

Answer 5

low pressure

Question 6

why does fountain pen leak in planes

Answer 6

low pressure

Question 7

what kind of waves are sound waves

Answer 7

longitudinal waves

Question 8

what is the audible range

Answer 8

20 hz to 20khz

Question 9

how does the speed of sound varies in different mediums

Answer 9

highest in solid, then liq then gas
zero in vacuum

Question 10

what is the speed of sound in air

Answer 10

332m/s

Question 11

what is the 1 unit of domestic electricity

Answer 11

1KWH

Question 12

what is the electric heater wire made with

Answer 12

nichrome (nickle-chromium)

Question 13

what kind of connection is the household electricity connection

Answer 13

parallel connection

Question 14

why are household electric connections parallel

Answer 14

for a constant 220v connection

Question 15

why is electric current fatal to humans

Answer 15

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

Question 16

egs of diamagnetic materials

Answer 16

zn
bismuth
cu
ag
au
diamond
salt
water

Question 17

egs of ferromagnetic materials

Answer 17

platinum
cr
na
al
oxygen

Question 18

uses of radioactivity

Answer 18

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

Question 19

which elements are used in nuclear fission

Answer 19

uranium 235 and plutonium 239

Question 20

egs of diluents

Answer 20

heavy water
graphite

Question 21

control rod which absorbs extra nitrogen is made with

Answer 21

cadmium and boron

Question 22

procedure to purify raw petroleum is called

Answer 22

dephlegmation

Question 23

what is dephlegmation

Answer 23

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

Question 24

why is the green color in firecrackers

Answer 24

barium

Question 25

which metals are found in pure form on earth

Answer 25

ag au cu platinum bismuth

Question 26

what is known as white gold

Answer 26

platinum

Question 27

what is known as fool's gold

Answer 27

iron pyrites

Question 28

who administered the first vaccine and for which disease

Answer 28

edward jenner on small pox

Question 29

who first did dna synthesis in lab

Answer 29

hargovind khurrana

Question 30

why is the red color of tomato

Answer 30

lycopene

Question 31

why is the red color of carrot

Answer 31

carotene

Question 32

why is the red color of beetroot

Answer 32

betanin

Question 33

why is the green colour of leaves

Answer 33

clorophyl

Question 34

which 4 acids are in DNA

Answer 34

adenin guanin thiamin cytosin

Question 35

what is mission shakti

Answer 35

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

Question 36

when was the first successful test by DRDO for mission shakti

Answer 36

2019

Question 37

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

Answer 37

us russia china

Question 38

which is the main pollutant in cigarette smoke

Answer 38

benzene and carbon monoxide

Question 39

which is the carcinogen in cigarette smoke

Answer 39

benzene

Question 40

which acid causes swelling and itching due to insect bites

Answer 40

formic acid HCOOH

Question 41

how to neutralize insect bites

Answer 41

using basic solution like soda or shop against formic acid

Question 42

why is the odour in garlic or onion

Answer 42

sulphur

Question 43

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

Answer 43

oxydation

Question 44

which cells can breathe anaerobically

Answer 44

yeast muscle cells

Question 45

why do muscles ache after workout

Answer 45

lactic acid gets deposited in muscle cells

Question 46

excretion in fish content?

Answer 46

ammonia

Question 47

excretion in humans content?

Answer 47

urea

Question 48

what do birds and reptiles excrete

Answer 48

uric acid

Question 49

what are the two types of dialysis

Answer 49

hemodylisys peritoneal dextrose based dialysis

Question 50

how is petroleum formed

Answer 50

because of ancient oceanic animals dying and succumbing to extreme pressure

Question 51

how is coal formed

Answer 51

forests when in permocarbonifrous period sunk into earth

Question 52

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

Answer 52

water is heavier and settles under the fuel

Question 53

how do we stop a fuel fire

Answer 53

use co2 or sand to stop oxygen supply