(−145) + 97 + (−365)

= −145+ 97   −365

= −145−365 + 97   

= - 510 + 97   

= - 413

A ns w e r : 4

The chemical equation for the reaction of lead sulfide with ozone follows:

By stoichiometry of the reaction:

1 mole of lead sulfide reacts with 4 moles of ozone.

So, 1 molecule of lead sulfide will react with  molecules of ozone.

Or

PbS + O₃ --> PbSO₄

After balancing

3PbS + 4O₃ --> 3PbSO₄

An s w e r:

The advantages of find and replace function is that it helps changing single word to another word if the document is ready and long and changing multiple time is a fuss.

The sight of the bus that travelled between her village and the nearest town, filled each time with a new set of passengers, was a source of unending joy for Valli. Her strongest desire was to ride the bus. Valli found out that the bus journey to the town took 45 minutes and the one-way fare costed 30 paisa.

A n s w e r: - 105

(- 7) + (- 8) + (- 90)

= -7 - 8 - 90         [Since, as per the rules  + - = -]

= - ( 7 + 8 + 90)

= - ( + 1 0  5)

= - (1 0 5)  [Since, as per the rules  + - = -]

= - 1 0 5   

The close emotional bond of affection that develop between infants and their parents is called attachment. Human babies form an attachment with their parents or caregivers who consistently and appropriately reciprocate to their signals of love and affection. According to Erikson (1968), the first year of life is the key time for the development of attachment. It represents the stage of developing trust or mistrust. A sense of trust is built on a feeling of physical comfort which builds an expectation of the world as a secure and good place.

An infant’s sense of trust is developed by responsive and sensitive parenting. If the parents are sensitive, affectionate, and accepting, it provides the infant a strong base to explore the environment. Such infants are likely to develop a secune attachment. On the other hand, if the parents are insensitive and show dissatisfaction land find faults with the child, it can lead to creating feelings of self-doubt in the child.

If d is the hcf of 48 and 72 so the value of d will be the hcf of later
factor of 48 is
2,3,4,6,8,12,24 and 48
factor of 72 is
2,3,4,6,8,9,12,24,36 and 72
so the hcf is 24 and d= 24
or
d = HCF ( 48, 72 )

48 = 2 * 2 * 2 * 2 * 3

72 = 2 * 2 * 2 *3 * 3

so HCF = 2 * 2 * 2 * 3

➡ 24

Answer :- d = HCF ( 48, 72 ) = 24

Second Order

Nobles

– Vassals of the king

– They enjoyed a privileged status

– Absolute control over property

– Could raise troops

– Even coin his own money

The Nobility

The nobles of kings were big land holders and they used to be vassal of the king whereas the peasants were vassals to the land owners. In France the rulers were linked to 'vassalage',similarly the Franks of Gaul also followed the same tradition.

BIRTH OF THE WEIMER REPUBLIC

Germany fought the First World War (1914–1918) along with the Austrian empire and against the Allies (England, France and Russia).

Germany initially made gains by occupying France and Belgium. However, the Allies won defeating Germany and the Central Powers in 1918.

The defeat of the Imperial Germany and the abdication of the emperor gave an opportunity to parliamentary parties to recast German polity.A National Assembly met at Weimer and established a democratic constitution with a federal structure. The republic, however, was not received well by its own people largely because of the terms it was forced to accept after Germany’s defeat at the end of the First World War. Many

Germans held the new Weimer Republic responsible for not only the defeat in the war but the disgrace at Versailles.

Click on the given link for notes:

<a data-ved="2ahUKEwiE6MKq5OXtAhUEfSsKHTepDDMQFjAAegQIAxAC" href="https://mycbseguide.com/blog/history-nazism-rise-hitler/" ping="/url?sa=t&source=web&rct=j&url=https://mycbseguide.com/blog/history-nazism-rise-hitler/&ved=2ahUKEwiE6MKq5OXtAhUEfSsKHTepDDMQFjAAegQIAxAC" rel="noopener" target="_blank">History-Nazism and the Rise of Hitler class 9 Notes Social ...</a>

ANSWER

The average kinetic energy of a collection of gas particles is directly proportional to absolute temperature only.

We know that, KE = 3 / 2 kT

where 3 / 2 k , so KE ∝ T
Now we can say that the average kinetic energy of a gas molecule at absolute temperature T is directly proportional to T.

The average kinetic energy of the particles in a gas is proportional to the temperature of the gas

The actual charge felt by the valence shell electron is called effective nuclear energy. It is denoted by 

z_eff  and the repulsive forces felt by valence shell electrons from the electron present in the inner shell is called shielding effect or screening effect.
z_eff = total nuclear charge − screening constant (σ)
Screening constant = total nuclear charge − z_eff
Greater the number of electrons in inner shells larger will be the screening effect. With increase in screening effect z_eff will be decreased.
As the force of attraction by the nucleus for the valence shell electrons decreases and hence the ionization energy decreases. In other words an increase in the number of electrons in the inner shell leads to decrease the ionization energy.

 

The electrons present in the inner shells act as screens between the nucleus and the valence shell electrons. In order words, these electrons partially neutralise the force fo attraction fo the nucleus, over the valence electrons. This is called, 'shielding or screening effect'.
When the screening effect increase (No. of inner electron-shells increase), the IP decreases.
THe magnitude of screening effect  ∝1/I.P.

HRD Minister Ramesh Nishank announced a major CBSE syllabus reduction for the new academic year 2020-21 on July 7 which was soon followed by an official notification by CBSE on the same.

Considering the loss of classroom teaching time due to the Covid-19 pandemic and lockdown, CBSE reduced the syllabus of classes 9 to 12 with the help of suggestions from NCERT.

Click on the given links for deleted syllabus:

• <a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDComputer_Application_Sec_2020-21.pdf" target="_blank">Deleted - Computer Application</a>
• <a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDEnglish_Sec_2020-21.pdf" target="_blank">Deleted - English - Language and Literature</a>
• <a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDHindi_A_Sec_2020-21.pdf" target="_blank">Deleted - Hindi A</a>
• <a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDHindi_B_Sec_2020-21.pdf" target="_blank">Deleted - Hindi B</a>
• <a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDHome_Science_Sec_2020-21.pdf" target="_blank">Deleted - Home Science</a>
• <a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDMathematics_Sec_2020-21.pdf" target="_blank">Deleted - Mathematics</a>
• <a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDScience_Sec_2020-21.pdf" target="_blank">Deleted - Science</a>
• <a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDSocial_Science_Sec_2020-21.pdf" target="_blank">Deleted - Social Science</a>

Let 2+√3 is a rational number.
A rational number can be written in the form of p/q.
2+√3=p/q
√3=p/q-2
√3=(p-2q)/q
p,q are integers then (p-2q)/q is a rational number.
But this contradicts the fact that √3 is an irrational number.
So,our supposition is false.
Therefore,2+√3 is an irrational number.
Hence proved.

Napoleon Bonaparte was the ruler of France. He was crowned as the king of France in December 1804. He was known as the ‘son of the revolution’.

• After the French Revolution, France became a republic.
• The Jacobins introduced some radical reforms but they under Robespierre followed the policies so relentlessly that he himself was guillotine in July 1794.
• The fall of the Jacobin government allowed the wealthier middle class to seize power. Two legislative councils were elected, who then appointed a Directory, an executive made of five members
• Directors often clashed with legislative Councils and the latter sought to dismiss them.
• Political instability of the Directory paved the way for the rise of military dictator Napoleon Bonaparte<button aria-label="like this post" title="like this post">
  </button>

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Napoleon Bonaparte was the ruler of France. He was crowned as the king of France in December 1804. He was known as the ‘son of the revolution’. He was an excellent general who recovered he lost territories. He Expanded his kingdoms through wars with Austria , Prussia and Russia between 1805-07. He passed the Napoleonic code in 1805 to simplify the administration. He was defeated very badly by the British General Arthur Wellesley at Waterloo in 1815. He was arrested and sent to the island of Saint Helena where he died in 1821.
 In 1799 Napoleon became the first council after overthrowing the role of directory. He acquired numerous powers and even opted for a plebiscite in which 99.9 % people voted for his new administrative system. He not only conquered new areas but also made peace treaties with the enemies. All this proves that he was an able administrator. He implemented many  reforms from 1799 till 1804 which are given as follows :
1.He stopped inflation through the financial reforms.

2. He established the Bank of France.

3. He resolve the long time confrontation with the Pope which was started with the confiscation of Church’s property in 1789. He event declared Catholic religion as a religion of the majority of French people.

4. Later on he introduced the Napoleonic code which became the basis of French legal system in the future.

Crop protection is the general method or the practice of protecting the crop yields from different agents including pests, weeds, plant diseases, and other organisms that cause damage to the agricultural crops.

Apart from crops, agricultural fields would have weeds, small animals like rats, mites, insects, pests, disease-causing pathogens and frequently raided by birds. All these factors are mainly responsible for the loss or damage to the crops. Thus to yield high crop production, farmers need to protect the crop from these pests. Hence crop protection management is important before, during and after the cultivation.

Crop protection is the general method or the practice of protecting the crop yields from different agents including pests, weeds, plant diseases, and other organisms that cause damage to the agricultural crops.

Apart from crops, agricultural fields would have weeds, small animals like rats, mites, insects, pests, disease-causing pathogens and frequently raided by birds. All these factors are mainly responsible for the loss or damage to the crops. Thus to yield high crop production, farmers need to protect the crop from these pests. Hence crop protection management is important before, during and after the cultivation.

Where, TAG is the HTML element, name is the name of an attribute, set to the provided value.

Size: It specifies the size of the text inside a <FONT> tag.

Syntax

(i) <INPUT type = "text" name = "name of text box">
 (iii) <INPUT type = "checkbox" name = "nameofTheCheckbox" value = "theValueTobeused">
 

  Life is dull because of stark realities. It thus remains unthrilling. Jokes and pranks play the role of spice and make life enjoyable. But if pranks and jokes pinch and hurt others, the very spice becomes poisonous. If they are at somebody else’s cost, they leave a bitter taste. So one should not play pranks or jokes to annoy somebody. Above all pranks should not also harm other people. If somebody appears, before a weak-hearted person, in the disguise of a ghost, that can kill the person.

                        Pranks should set right moods and banish enmity. A man should remain sensitive while trying to create lighter moments. The horse could have created trouble for Mound and Aram. The horse taken away just for a joy-ride might have thrown them on the ground. John Byro, whose horse Mourad had stolen, was a tactful man. He pricked the conscience of the boys by saying that he knew that they were honest boys who belonged to an honourable family and they could not be thieves. Eventually, Mourad’s conscience pricked him and he returned the horse. Pranks and jokes should be mild and innocent.

A movie clip can be inserted in two ways:-
1.  Using Insert Tab
2.  Using Title and Content Layout Option

1.  Steps to insert a movie in a presentation using Insert Tab are:-
1)  Click on Movie option under Media clips group in the Insert tab. A drop down appears.
2)  Select the Movie from File…option to insert the movie clip. A dialog box appears.
3)  Select a movie clip and click OK to insert the same in the slide.
4)  A message box appears asking you how do you play the movie, i.e. Automatically or When Clicked.
5)  Click on any of the options available and  movie clip will be inserted in the slide.
                                       OR
1)  Click on Movie from Clip Organizer… option under Media clips group in the Insert tab to insert the movie clips
hat are available under Clip organizer.
2)  Clip Art pane will be displayed on the right side.
3)  Select any of the movies available  and insert it in the slide.

2.  Steps to insert a movie in the presentation using Layout option:-
1)  Click on Layout option available under Slides group in the Home tab. A drop down list appears.
2)  Click on Title and Content option and a slide will be displayed with the same Layout.
3)  Insert a movie in the slide by clicking the movie icon in the Layout option.
4)  A dialog box will appear.  Select a movie clip and click on Open.
5)  A message box appears asking you how do you play the movie, i.e. Automatically or When Clicked.
6)  Click on any of the options available and movie clip will be inserted in the slide.