Given that the rate constant for a first order reaction is 60 s−1.

Let a M be the initial concentration. 

Final concentration will be 16a​ M.

Rate constant, k=60/s

Time = 0.0462 sec^-1

Drawbacks of Mendeleev’s periodic table:
1. Position of hydrogen: Hydrogen is placed in group I. However, it resembles the elements of group I (alkali metals) as well as the elements of group VILA, (halogens). Therefore, the position of hydrogen in the periodic table is not correctly defined.
2. Anomalous pairs: In certain pairs of elements, the increasing order of atomic masses was not obeyed. In these cases, Mendeleev placed elements according to similarities in their properties and not in increasing order of their atomic masses. For example, argon (Ar, atomic mass 39.9) is placed before potassium (K, atomic mass 39.1). Similarly, cobalt (Co, atomic mass 58.9) is placed before nickel (Ni, atomic mass 58.6) and tellurium (Te, atomic mass 127.6) is placed before iodine (I, atomic mass 126.9). These positions were not justified.
3. Position of isotopes: Isotopes are the atoms of the same element having different atomic masses but same atomic number. Therefore, according to Mendeleev’s classification, these should be placed at different places depending upon their atomic masses. For example, isotopes of hydrogen with atomic masses 1,2 and 3 should be placed at three places. However, isotopes have not been given separate places in the periodic table.
4. Some similar elements are separated and dissimilar elements are grouped together: In the Mendeleev’s periodic table, some similar elements were placed in different groups while some dissimilar elements
had been grouped together. For example, copper and mercury resembled
in their properties but they had been placed in different groups. At the same time, elements of group IA such as Li, Na and K were grouped with copper (Cu), silver (Ag) and gold (Au), though their properties are quite different.
5. Cause of periodicity: Mendeleev did not explain the cause of periodicity among the elements.
6. Position of lanthanoids (or lanthanides) and actinoids (or actinides):
The fourteen elements following lanthanum (known as lanthanoids, from atomic number 58-71) and the fourteen elements following actinium (known as actinoids, from atomic number 90 – 103) have not been given separate places in Mendeleev’s table.
In order to cover more elements, Mendeleev modified his periodic table.

1. He generalized the study of the elements then known as the study of a mere groups.

2. In Mendeleev’s periodic table, he left some blank spaces. These vacant spaces were left for including elements that were not discovered at that time.

3. Mendeleev could also predict the properties of these unknown elements, on the basis of the properties of the elements lying adjacent to these vacant spaces.

He predicted the presence of three elements. They were named as Eka boron, Eka-aluminium and Eka-silicon. The properties of these three elements were similar to the actual elements discovered later.

Eka-boron was similar to Scandium, Eka-aluminium was similar to Gallium and Eka-silicon was similar to Germanium.

4. When noble gases were discovered later, they could be accommodated in the periodic table in the form of a separate group without disturbing the positions of the other elements.

5. He was able to correct the values of the atomic masses of elements like gold and platinum, he placed these elements going strictly by the similarities in their properties.

महाभारत के रचनाकार के विषय में भी इतिहासकार एकमत नहीं हैं। जनश्रुतियों के अनुसार महर्षि व्यास ने इस ग्रंथ को श्रीगणेश जी से लिखवाया था। परंतु आधुनिक विद्वानों का विचार है कि इसकी रचना किसी एक लेखक द्वारा नहीं हुई। वर्तमान में इस ग्रंथ में एक लाख श्लोक हैं लेकिन शुरू में इसमें मात्र 8800 श्लोक ही थे। दीर्घकाल में रचे गए इन श्लोकों का रचयिता कोई एक लेखक नहीं हो सकता । इतिहासकार मानते हैं कि इसकी मूल गाथा के रचयिता भाट सारथी थे, जिन्हें सूत कहा जाता था। यह 'सूत' क्षत्रिय योद्धाओं के साथ रणक्षेत्र में जाते थेऔर उनकी विजयगाथाएँ रचते थे। विजयों का बखान करने वाली यह कथा परंपरा मौखिक रूप से एक पीढ़ी से दूसरी पीढ़ी में चलती रही। इतिहासकारों का अनुमान है कि पाँचवीं शताब्दी ई०पू० से इस कथा परंपरा को ब्राह्मण लेखकों ने अपनाकर इसे और विस्तार दिया। साथ ही इसे लिखित रूप भी दिया । यही वह समय था जब उत्तर भारत में क्षेत्रीय राज्यों और राजतंत्रों का उदय हो रहा था । कुरु और पांचाल, जो महाभारत कथा के केंद्र बिंदु हैं, भी छोटे सरदारी राज्यों से बड़े राजतंत्रों के रूप में उभर रहे थे। संभवत: इन्हीं नई परिस्थितियों में महाभारत की कथा में कुछ नए अंश शामिल हुए। यह भी संभव है कि नए राजा अपने इतिहास को नियमित रूप से लिखवाना चाहते हों।

जैसे-जैसे आर्थिक, राजनीतिक और सामाजिक परिस्थितियाँ बदलती गईं, महाभारत की मूल गाथा में उनके अनुरूप नए अंश जुड़ते गए। महाभारत ज्ञान का एक अपूर्व खजाना बनता गया। धर्म, दर्शन और उपदेश इत्यादि अंश मूल कथा के साथ जुड़कर महाभारत एक विशाल ग्रंथ बनता गया। इस ग्रंथ की रचना का एक और महत्त्वपूर्ण चरण लगभग 200 ई०पू० से 200 ईसवी के बीच शुरू हुआ। यह वही चरण था जिसमें आराध्य देव के रूप में विष्णु की महत्ता बढ़ रही थी। श्रीकृष्ण, जो इस महाकाव्य के महानायकों में से एक थे, को भगवान श्री विष्णु के अवतार के रूप में स्वीकार किया गया। इस प्रकार लगभग 1000 वर्ष से भी अधिक अवधि में यह ग्रंथ अपना वृहत् रूप धारण कर पाया। इससे यह भी स्पष्ट है कि इसकी रचना करने.में एक से अधिक विद्वानों का योगदान है।

If your options are

1 Life expectancy

2 Education attainment

3 per capital income

4 National income

Ans : National income is the total value of all goods and services produced in one year. National income is not an indicator of Human Development Index.

Real World Examples Of Inelastic Collision

• The ball is dropped from a certain height and it is unable to rise to its original height.
• When soft mudball is thrown against the wall, will stick to the wall.
• The accident of two vehicles
• A car hitting a tree.

The full form of BPO is Business Process Outsourcing. BPO is an organization contract with a 3rd party or an independent service provider with regards to its workflow activities and obligations. It is a cost-saving process that allows enterprises to outsource their non-core functions.

Why did the neighbours kill the dog?
Solution:
The neigbours killed the dog in anger. They have expected the dog to help them get a treasure, but the dog had rather taken them to a foul smelling dead kitten.

CPU: Central Proccesing Unit

The computer brain is a microprocessor called the central processing unit (CPU). The CPU is a chip containing millions of tiny transistors. It's the CPU's job to perform the calculations necessary to make the computer work -- the transistors in the CPU manipulate the data. You can think of a CPU as the decision maker.

Sometimes referred to simply as the central processor, but more commonly called processor, the CPU is the brains of the computer where most calculations take place. In terms of computing power, the CPU is the most important element of a computer system.

The CPU (Central Processing Unit) is the part of a computer system that is commonly referred to as the "brains" of a computer. The CPU is also known as the processor or microprocessor. The CPU is responsible for executing a sequence of stored instructions called a program.

heart and brain of computer can simply be referred to as the central processing unit (CPU) of a given Computer. This is where the activities modulate within there programmed compact-ability in respect to the link between the software and the Hardware.

The British physicist Sir James Chadwick discovered neutrons in the year 1932. He was awarded the Nobel Prize in Physics in the year 1935 for this discovery.

How were Neutrons Discovered?

• James Chadwick fired alpha radiation at beryllium sheet from a polonium source. This led to the production of an uncharged, penetrating radiation.
• This radiation was made incident on paraffin wax, a hydrocarbon having a relatively high hydrogen content.
• The protons ejected from the paraffin wax (when struck by the uncharged radiation) were observed with the help of an ionization chamber.
• The range of the liberated protons was measured and the interaction between the uncharged radiation and the atoms of several gases was studied by Chadwick.
• He concluded that the unusually penetrating radiation consisted of uncharged particles having (approximately) the same mass as a proton. These particles were later termed ‘neutrons’.

In the initial part of the story Lushkoff comes across as a characterless lazy beggar who wants easy life. 

He begs for food because he doesn't want to work. 

Skvortsoff tries to make him work by offering him a wood chopping job.

His cook Olga cries everyday because Lushkoff never chops even a single piece of wood.

Lushkoff is a smart liar who resorts to many tricks to save himself from work. He cares little for the old cook and there is no change in his lethargic attitude.

The character of Lushkoff shines at the end of this story when he changes completely and surprises Skvortsoff. 

We see a different shade of Lushkoff who is proud of his work. He shows gratitude for the old woman Olga whose tears forced him to change.

a farm labourer is a person who works in an agricultural field under the field owner and is paid wages by the owner. the economic condition of them is not so good. they might be employed on a daily or monthly basis.

Anil was a writer who employed a servant Hari Singh.

Anil did not have much income but one day he came home with some money which he hid under the mattress.

The servant became greedy and stole this money but then he repented when he remembered what Anil had told him about education making him a man instead of a common thief.

This made Hari Singh return the money under the mattress.