2k18 to 2k20 memes

 

Will force of friction come into play when a riandrop rolls down a glass window plan?

 

 Will force of friction come into play when a riandrop rolls down a glass window plan?

rain drop on glass rolls down side due to gravity

Ans. Yes, there will be friction a rain drop and glass window plane. But as the window surface  is smooth the frictional force is not so strong to hold the rain drop on window surface and thus rain drop rolls down.

on the rain drop works gravitational force. so rain drop rolls down side not to up side 

thankin you 

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https://targetacademy07.blogspot.com/2021/04/will-force-of-friction-come-into-play.html

An element a with atomic number 11 form a compound with element B with atomic number 16 what will be the formulla of the compound formed?

An element a with atomic number 11 form a compound with element B with atomic number 16 what will be the formulla of the compound formed?

 हमें पता है की atom  में electron 2n^2 के फॉर्मूले से भरे जाते है यह n  = 1 2 3 4 5 6 कोश की संख्या  होता  है

इस फॉर्मूले से अगर 11 नंबर वाले atom में electron भरे जाए तो 

 

total  electron = 11 (क्योकि atomic नंबर 11 यानि प्रोटोन की संख्या 11 और इलेक्ट्रान की संख्या प्रोटोन के बराबर होती है )

अगर इसमें इलेक्ट्रान भरा जाए तो इलेक्ट्रान  KLMN कोष में भरे जाएगी 

हम जानते है की K = 1 , L = 2, M = 3 , N =  4 .......  होता है  

n  = 1 

तो  

K = 2x 1^2 = 2 

यानि k  कोष में केवल 2 इलेक्ट्रान आ सकते है 

बाकि बचे इलेक्ट्रान दूसरे कोष मे भरे जाएगी 

n =2 

L  = 2 x 2^2  = 8 

L  कोष में 8  इलेक्ट्रान भरने के बाद केवल एक इलेक्ट्रान बचता है जो की M कोष में भरा जाए गा 

M कोष में मैक्सिमम 2 x  3^2 = 18 इलेक्ट्रान भरे जासकते है 

यानि इसका इलेक्ट्रोनिक विन्यास (electronic configur )

K = 2 

L = 8

M = 1

 

electron bharne ka KLMN formulla

होगा यानि इसमें एक इलेक्ट्रान मुक्त या unpair  होगा 

इस कारण इसका octact  या अस्टक पूरा नहीं हो  पता है ऐसे अष्ठक पूरा करने के लिए या तो 7 इलेक्ट्रान दूसरे atom से लेना पड़ेगा जो की संभव नहीं है या दूसरे एटम को अपना M कोष में पड़ा इलेक्ट्रान देदे तो इसका स्थाईत्व बाद जाएगा 

दूसरे एटम से 7 इलेक्ट्रान नहीं लिए जासकते है क्यों की इसमें ज्यादा energy  की आवश्यक्ता होती है लेकिन ये किसी दूसरे एटम को अपना एक इलेक्ट्रान easy  से दे सकता है और अपना स्थाईत्व बड़ा सकता है तो यह एक इलेक्ट्रान दे देता है 

dusre atom ki bat kare to dusre atom mai bhi pahle atom ki tarh hi electron bhare jaenge uske 

K  = 2 

L= 8

M= 6

electron bhare jaege tatha eske outer most shell me 6 electron hi rah jate hai

hume pta hai ki eski asthak pura karne ke liye ya to 6 ke 6 electrone kisi dusre atom ko dede ya kisi dusre atom se 2 electron lele 

hum jante hai 6 electron dene mai  bahut jyada energy ki jarurat hoti hai esliye ye dusre atom se 2 electron lega kyo ki esme kam energy ji jarurt hoti hai 

agar atom A and atom B dono react kar ke product bnate hai to hame ptaa hai ki atom A ki valency +1 hogi (+1 valency se eska octact complite hojata hai or atom stable ho hata hai ) v atom B ki valancy -2 hogi (kyo ki ye do electron lekar apne outer most shall ka octat complet kar leta hai)

so final product hoga

2A + B  ⟶ A2B

kyo ki A ki valency +1 hai lekin B ko 2 electron ki aavashyakata hai or agr B 2 A atom ke sath judta hai to A ki valancy bhi complite ho jate hai or B ki valancy bhi complite ho jati hai or octet rule bhi satisifi ho jata hai  

thanking you

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Arrenge the following elementin the over of their decreasing matellic charetor.

 

 Arrenge the following elementin the over of their decreasing matellic charetor.

Na , Si, Cl , Mg , Al ,

Ans.  Na > Mg > Al > Si > Cl 

period me  right move karte hai to matallic charactor decrease hote hai 

diye gaye element me sabse jyada right side me chlorine hai to sabse kam matallic hoga v sabse jyada left me Na hai is liye ye sabse jyada matallic hoga

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 explain how human Ear works?

Outer ear works 

The outer ear is called ‘pinna’. It collects the sound from the surroundings. 

The collected sound passes through the auditory canal. At the end of the auditory canal there is a thin membrane called the ear drum or tympanic membrane. 

When a compression of the medium reaches the eardrum the pressure on the outside of the membrane increases and forces the eardrum inward. Similarly, the eardrum moves outward when a rarefaction reaches it. In this way the eardrum vibrates. 

middle ear works

The vibrations are amplified several times by three bones (the hammer, anvil and stirrup) in the middle ear. The middle ear transmits the amplified pressure variations received from the sound wave to the inner ear. 

inner ear works

In the inner ear, the pressure variations are turned into electrical signals by the cochlea. These electrical signals are sent to the brain via the auditory nerve, and the brain interprets them as sound.

simple ear structure

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what is power?

 what is power?

power :- Rate of doing work is called power.

or The work done in per unit time is called power.

its IS unit is Watt and joule per second (J/s)

शक्ति :- कार्य करने की दर शक्ति कहलाती है या इकाई समय में किया गया कार्य शाक्ति कहलाती है इसकी IS इकाई जुल प्रीति सेकंड होती है 

P = work / time = j/s

P = J/s

work = force x displacement

and

force = m x accelaretion (here m for mass in kg) and (accelartion = m/s^2(m for meter and s for second) )

then

work =   m x accelaretion x displacement(in meter)

then unite of work is

work =  kg m/s^2 x m 

then

work = kg m^2/s^2

then unit of power

power = work/s 

than 

power = kg m^2 /s^2xs

then

power = kg m^2 / s^3

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https://targetacademy07.blogspot.com/2021/04/what-is-power.html

 

 micro organisms : friend and foe MCQ

MCQ 

1. Lactobacillus is commonly found in 
Ans. Curd

2. Device used to see the micro organism is
Ans. Microscope

3. Malaria caused by
Ans. protozoa

4. Fungus used in baking of breadis 

Ans. Yeast

5. AIDS is caused by
Ans. HIV

6. Which of the following drug is an antipyretic?
Ans. Paracetamol

7. What helps in the rise of bread or dosa dough?
Ans. Growth of yeast cell

8. Bacteria present  in root modules of pea
Ans. Rhizobium

9. The disease caused by protoza is 
Ans. Malaria 

10. which bateria helps in settling of crud?
Ans. Lactobacillus
 

https://targetacademy07.blogspot.com/2021/04/micro-organisms-friend-and-foe-mcq.html

 

 why do we store silver chloride in dark bottles?

question 

dark bottle 

Ans. 

silver chloride light sensitive chemical होता है ये प्रकाश की उपस्थिति में photolytic decomposition reaction (प्रकासिक अपघटन ) करने लगता है व silver और क्लोराइड गैस में टूट जाता है इस लिए इसे dark colour की बोत्तल में store किया जाता है 

silver chloride + sun light   ➝  silver  + chloride (Cl2
)

kya penicilium sabhi bactiria ko mar deta hai

तो इसका उत्तर है नहीं पेनिसिलियम सभी  बैक्टीरिआ और फुनगी को नहीं मरता है यह कुछ विशिष्ठ बैक्टीरिआ और फुनगी को ही मरता है  जैसे 

 

staphylococci and streptococci

ये दो ऐसे बैक्टीरिआ के  उदाहरण  है जिनको पेनिसिलियम मर देता है 

और अब बात करते है ऐसे बैक्टीरिआ की जिनको पेनिसिलियम नहीं मर पता है 

Staphylococcus aureus ('golden staph' or MRSA) and Neisseria gonorrhoeae (the cause of gonorrhoea)

Q. fill in the blanks Q1. mixture are contitude by more than one kind of pure form of .......

fill in the blanks  

Q1. mixture are contitude by more than one kind of pure form of .......

Q2. Thomson proposed the model of an atom similar to ........

Q3. Acceleration .......

Q4. Accepted value of G is........

Q5. Formulla of ozone is ........

answer 

ans 1. Matter 

ans2. plam puding model 

ans3. accelaretion is change in valocity in per unite time or a = (Vf - Vi)/t

Vf = final valocity

Vi = initial valocity

t = time

ans4. accepted value of G = 6.67 x 10^-11 Nm^2/kg^2

(here G is univarsal gravitational  constant )

ans5. Formula of ozone is  = O3

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Q. with figer write the different zone of flam A. The different zones of a candle flame can be described as follows

candle flame

 The different zones of a candle flame can be described as follows:

1. The innermost zone:   The innermost zone is the zone which is formed just around the wick of the candle flame as the candle burns.  It is also known as dark zone of the flame. It consists of hot, unburnt vapours of the combustible material. There is no air present here.  It is the least hot of all the zones.

2. Middle zone:  The middle zone also known as luminous zone is the zone which is moderately hot with limited oxygen supply. Hence, the fuel vapours burn partially and produce carbon particles. These particles then leave the flame as smoke and soot. This zone is the major part of the flame. The colour of this zone is yellow.

3. The outermost zone:   The outermost zone also known as non-luminous zone is the zone of complete combustion. The ample presence of oxygen (or air) aids in complete combustion. It is the hottest zone of the candle flame and does not produce much light. It is blue in colour.