Short Note (Question Based)

Question 13 Marks

Knowing the age:

Describe carbon $14$
Which are stable form of carbon $?$
When do the animals and plants stop to take carbon $14\ ?$
What is archaeomagnetic technology $?$

Answer

For dating, the technology is used widely. One of them is radiocarbon dating. The radicocarbon or carbon $14$ is unstable and weakly readioative form of carbon. The carbon $12$ and $13$ are stable forms. The carbon $12$ takes form and then changes in upper atmosphere. The plants and animals take Carbon $14$ during life and stop it after death. Then it starts to decrease at a rate determined by the law of radio active decay. It is designed to measure this leftover radioactivity. The age of a living being can be known by knowing how much carbon $14$ is left at its death. Another method is archaeomagnetic dating, and the easiest is the tree ring dating. Every year, the changes in a tree take place because of rainfall. They convert in to year rings. The methods are useful in knowing the historical events $-$ its time, civilization, rocks, crime investigation too.

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Question 23 Marks

Dating:

Describe carbon $14$
Which are stable form of carbon $?$
When do the animals and plants stop to take carbon $14\ ?$
What is archaeomagnetic technology $?$

Answer

For dating, the technology is used widely. One of them is radiocarbon dating. The radicocarbon or carbon $14$ is unstable and weakly readioative form of carbon. The carbon $12$ and $13$ are stable forms. The carbon $12$ takes form and then changes in upper atmosphere. The plants and animals take Carbon $14$ during life and stop it after death. Then it starts to decrease at a rate determined by the law of radio active decay. It is designed to measure this leftover radioactivity. The age of a living being can be known by knowing how much carbon $14$ is left at its death. Another method is archaeomagnetic dating, and the easiest is the tree ring dating. Every year, the changes in a tree take place because of rainfall. They convert in to year rings. The methods are useful in knowing the historical events $-$ its time, civilization, rocks, crime investigation too.

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Question 33 Marks

Technology indentifying culprits:

What is $\text{D.N.A}\ ?$
Who is depending on it $?$
How can it identified $?$
Which are other technologies to identify criminals $?$

Answer

The modern technology like $\text{D.N.A.}$ test, finger$-$prints, photo composites are very perfect and useful in identifying the criminals. Even the Police department too depend on it. The $\text{D.N.A.}$ is the basic biological material $-$ thousands of them in a cell. Every person has unique finger$-$print. It cannot be faked. It can be identified from blood, saliva or even a single hair is enough for the test Even photo composites or bites on any edible is also enough for identification of any criminal. The technology is so accurate that police or even court also trust and give verdict based on it.

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Question 43 Marks

Father Brown's trick:

What was father brown?
What had he made in restaurant?
When did he doubt on flambeau?
What did he say when flambeau asked about the parcel?
What had happened at the end of story?

Answer

Answer:
Father Brown was very clever. He had made Flambeau leave clues as proof in restaurant. He doubted him when he had been spiked bracelet under a little bulge up the sleeve. Flambeau was very surprised when father Brown told that he had changed the real parcel. When Flambeau asked him to take it by force, Mr. Brown told that he had given it at the sweet shop and got it mailed at Westminster. When Flambeau was trapped and looking to escape, Mr. Brown told that there were two policemen and a clever detective Valentine standing after that three.

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Question 53 Marks

Valentine:

Who was valentine $?$
What does he notice $?$
Say something about his skill.
How did he solve the case $?$

Answer

Valentine was a great detective from Paris. He generally notices or observes everything very closely or minutely. He has a great skill of placing himself in the shoes of the criminal. His very sense has made him a great and successful detective. In our story. 'The Blue Cross', he reaches London in search of a couple of two old priests $-$ Father Brown and a notorious French thief, Flambeau He observes salt in sugar bowl, splashing of soap. Broken window, payment of added or extra bills. He finds the criminal after hearing their conversation. How clever he is $!$

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