Data collected by an investigator is called the secondary data. – False

The data collected by an investigator is called the primary data, whereas, the data that is already in existence being collected by any other investigator is known as secondary data.

A n s w e r :
F P S System In this system, the unit of length is foot, the unit of mass is pound and the unit of time is second.

S.I system (standard international system). 

In this system the units of mass, length and time are same, as that of M.K.S system. 

The full form of S.I is standard international system, it is an international system of units for the measurements. SI is a measuring system that is dependent on 7 base units:

Length in metre

Mass in kilogram

Time in second

Electric current in ampere

Temperature in kelvin

Amount of substance in mole

Luminous intensity in candela.

Megaliths are stone structures. They were used to mark a burial site. A single large stone or several stones could be used to compose a megalith. Some megaliths could be seen above the ground, but some could be underground as well.

बादलों के आने पर प्रकृति में जिन गतिशील क्रियाओं को कवि ने चित्रित किया है, उन्हें लिखिए।
उत्तर:
बादलों के आने पर प्रकृति में निम्नलिखित गतिशील क्रियाओं को कवि द्वारा चित्रित किया गया है-

1. मेघ रूपी मेहमान के आने की सूचना देने के लिए बयार का नाचते-गाते आना।
2. पेड़ों द्वारा मेहमान को देखने के लिए गरदन ऊँची करना।
3. दरवाजे-खिड़कियों का खुलना।
4. आँधी का चलना और धूल का उड़ना।
5. नदी को ठिठककर बाँकी नजर से देखना।
6. पीपल का झुककर मेहमान का स्वागत करना।
7. लताओं का पेड़ों में छिपना।
8. क्षितिज पर बिजली का चमकना।
9. तालाब द्वारा पानी भर कर लाना।
10. जोरदार वर्षा का होना।

Bad effects are as under:- 1) Public sector monopolies gradually turned out to be a 'dead social weight'. By incurring heavy losses, public sector enterprise led to insufficient use of resources. 2) Protection of domestic industries stimulated its growth. But, it failed to achieve international standards of product quality. 3) Saving foreign exchange through import substitution proved to be an inefficient policy instrument.

It involves the formation of a new individual from a protrusion called bud. It is very common in plants, yeasts and lower-level animals such as Hydra.

In Hydra, the cells divide rapidly at a specific site and develop as an outgrowth called bud. These buds, while attached to the parent body, develop into small individuals. When this individual becomes large enough, it detaches itself from the parent body to exist as an independent individual.

Glucose is broken down into a three carbon molecule called pyruvate in the cell cytoplasm. Pyruvate is further broken down by different ways to provide energy in various organisms. Pyruvate is broken down in different ways in different organisms as shown below:

i.In yeast cells, during fermentation, pyruvate is converted into ethanol and carbon dioxide in the absence of oxygen.

ii. In mitochondria, breakdown of pyruvate takes place in presence of oxygen to give rise three molecules of carbon dioxide and water.

iii. Sometimes, when there is lack of oxygen, especially during vigorous activity, in our muscles, pyruvate is converted into lactic acid. Concept insight: Students should know various types of respiration.

Alexa is specifically the name of the virtual assistant – the disembodied voice you talk to, ask questions, and bug with song requests. Amazon’s Echo is simply the name given to the physical products themselves, the speakers which house the AI Alexa.

<font face="Times New Roman, serif"><font style="box-sizing: border-box;"><font size="3"><font style="box-sizing: border-box;">(i) We have,</font></font></font></font>

<font color="#808080"><font style="box-sizing: border-box;"></font></font>

<font face="Times New Roman, serif"><font style="box-sizing: border-box;"><font size="3"><font style="box-sizing: border-box;">Theorem states: </font></font></font></font>

<font face="Times New Roman, serif"><font style="box-sizing: border-box;"><font size="3"><font style="box-sizing: border-box;">Let </font></font></font></font><font face="Times New Roman, serif"><font style="box-sizing: border-box;"><font size="3"><font style="box-sizing: border-box;">be a rational number, such that the prime factorization of q is not of the form</font></font>, where <font size="3"><font style="box-sizing: border-box;">m and n are non-negative integers.</font></font></font></font>

<font face="Times New Roman, serif"><font style="box-sizing: border-box;"><font size="3"><font style="box-sizing: border-box;">Then, x has a decimal expression which does not have terminating decimal.</font></font></font></font>

<font face="Times New Roman, serif"><font style="box-sizing: border-box;"><font size="3"><font style="box-sizing: border-box;">(ii) We have,</font></font></font></font>

<font color="#808080"><font style="box-sizing: border-box;"></font></font>

<font face="Times New Roman, serif"><font style="box-sizing: border-box;"><font size="3"><font style="box-sizing: border-box;">Theorem states: </font></font></font></font>

<font face="Times New Roman, serif"><font style="box-sizing: border-box;"><font size="3"><font style="box-sizing: border-box;">Let </font></font></font></font><font face="Times New Roman, serif"><font style="box-sizing: border-box;"><font size="3"><font style="box-sizing: border-box;">be a rational number, such that the prime factorization of q is not of the form</font></font>, where <font size="3"><font style="box-sizing: border-box;">m and n are non-negative integers.</font></font></font></font>

<font face="Times New Roman, serif"><font style="box-sizing: border-box;"><font size="3"><font style="box-sizing: border-box;">Then, x has a decimal expression which does not have terminating decimal.</font></font></font></font>

<font face="Times New Roman, serif"><font style="box-sizing: border-box;"><font size="3"><font style="box-sizing: border-box;">(iii) We have,</font></font></font></font>

<font color="#808080"><font style="box-sizing: border-box;"></font></font>

<font face="Times New Roman, serif"><font style="box-sizing: border-box;"><font size="3"><font style="box-sizing: border-box;">Theorem states: </font></font></font></font>

<font face="Times New Roman, serif"><font style="box-sizing: border-box;"><font size="3"><font style="box-sizing: border-box;">Let </font></font></font></font><font face="Times New Roman, serif"><font style="box-sizing: border-box;"><font size="3"><font style="box-sizing: border-box;">be a rational number, such that the prime factorization of q is not of the form</font></font>, where <font size="3"><font style="box-sizing: border-box;">m and n are non-negative integers.</font></font></font></font>

<font face="Times New Roman, serif"><font style="box-sizing: border-box;"><font size="3"><font style="box-sizing: border-box;">Then, x has a decimal expression which does not have terminating decimal.</font></font></font></font>

<font face="Times New Roman, serif"><font style="box-sizing: border-box;"><font size="3"><font style="box-sizing: border-box;">(iv) We have,</font></font></font></font>

<font color="#808080"><font style="box-sizing: border-box;"></font></font>

<font face="Times New Roman, serif"><font style="box-sizing: border-box;"><font size="3"><font style="box-sizing: border-box;">Theorem states: </font></font></font></font>

<font face="Times New Roman, serif"><font style="box-sizing: border-box;"><font size="3"><font style="box-sizing: border-box;">Let </font></font></font></font><font face="Times New Roman, serif"><font style="box-sizing: border-box;"><font size="3"><font style="box-sizing: border-box;">be a rational number, such that the prime factorization of q is of the form</font></font>, where <font size="3"><font style="box-sizing: border-box;">m and n are non-negative integers.</font></font></font></font>

<font face="Times New Roman, serif"><font style="box-sizing: border-box;"><font size="3"><font style="box-sizing: border-box;">Then, x has a decimal expression which terminates after k places of decimals, where k is the larger of m and n.</font></font></font></font>

<font face="Times New Roman, serif"><font style="box-sizing: border-box;"><font size="3"><font style="box-sizing: border-box;">Then, x has a decimal expression which will have terminating decimal after 3 places of decimal.</font></font></font></font>

A n s w e r : 
Any Number which can be represented in the form p/q where q is not equal to 0

Hence 10/3 is a rational number

The Cl-,Br- and CN- nucleophiles can easily be introduced in the benzene in the presence of Cu(I) ion. This reaction is called sand Meyer's reaction.

It is used to synthesize aryl halides from aryl diazonium salts. It is an example of a radical-nucleophilic aromatic substitution.

When a primary aromatic amine, dissolved or suspended in cold aqueous mineral acid, is treated with sodium nitrite, a diazonium salt is formed. Mixing the solution of freshly prepared diazonium salt with cuprous chloride or cuprous bromide results in the replacement of the diazonium group by −Cl or −Br.

1. After 2000 BCE the royal capital of Mari flourished. Mari stands not on the southern plain with its highly productive agriculture but much further upstream on the Euphrates.  Here agriculture and animal rearing were carried out close to each other in this region.
2. Herders need to exchange young animals,cheese, leather and meat in return for grain,metal tools, etc., and the manure of a penned flock is also of great use to a farmer. Yet, at the same time, there may be conflict between the regions.
3. In Mesopotamian nomadic communities of the western desert filtered into the prosperous agricultural heartland. Shepherds would bring their flocks into the sown area in the summer.
4. Such groups would come in as herders, harvest labourersor hired soldiers, occasionally become prosperous, and settle down. A few gained the power to establish their own rule. These included the Akkadians, Amorites,Assyrians and Aramaeans.
5. The kings of Mari, however, had to be vigilant; herders of various tribes were allowed to move in the kingdom, but they were watched.The camps of herders are mentioned frequently in letters between kings and officials. In one letter, an officer writes to the king that he has been seeing frequent fire signals at night – sent by one camp to another – and he suspects that a raid or an attack is being planned.
6. Located on the Euphrates in a prime position for trade – in wood,copper, tin, oil, wine, and various other goods that were carried in boats along the Euphrates – between the south and the mineral rich uplands of Turkey, Syria and Lebanon.
7. Boats carrying grinding stones, wood, and wine and oil jars, would stop at Mari on their way to the southern cities. Officers of this town would go aboard, inspect the cargo and levy a charge of about one-tenth the value of the goods before allowing the boat to continue downstream.
8. Thus, although the kingdom of Mari was not militarily strong, but it was exceptionally prosperous.