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The 'microliths' were used by early man during the Mesolithic Age.

Key Points

The period when we find environmental changes, beginning about 12,000 years ago till about 10,000 years ago is called the Mesolithic Age or Middle Stone Age.

• Stone tools found during this period are generally tiny and are called microliths.
• Microliths were probably stuck onto handles of bone or wood to make tools such as saws and sickles.
• At the same time, older varieties of tools continued to be in use during this period.

Hence, we can conclude that the 'microliths' were used by early man during the Mesolithic Age. 

Additional Information

• The Mesolithic Age was a transitional period between the Palaeolithic and Neolithic Age.
• People of this era subsisted on hunting, fishing, and gathering food and later on they domesticated animals also.
• Mesolithic sites have been discovered in Rajasthan, south of the Krishna River, in central and eastern India and in southern Uttar Pradesh.
• Mesolithic sites in India include Bagor in Rajasthan and Adamgarh in Madhya Pradesh.

सही उत्तर है - ‘बटमार’।

• ‘डाकू’ का पर्यायवाची शब्द बटमार होगा।

Key Points

• ‘डाकू’ के अन्य पर्यायवाची शब्द : दस्यु, लुटेरा, डकैत, राहजन आदि।​

अन्य विकल्प:

• प्रवंचक के पर्यायवाची शब्द : धोखेबाज़, धूर्त, ठग आदि।
• रक्ततुण्ड के पर्यायवाची शब्द : तोता, सुग्गा, शुक, सुआ, कीर आदि।
• प्रगल्भ के पर्यायवाची शब्द : उत्साही, साहसी, निर्भय, निडर, धृष्ट, निर्लल्ज, अभिमानी, अहंकारी, घमंडी आदि।

Additional Informationसमानार्थी शब्द:

• वे शब्द जिनका अर्थ एक समान होता हैं समानार्थी शब्द कहलाते हैं।
• समानर्थी शब्द को हम पर्यायवाची शब्द भी कहते है। ‘पर्याय’ का अर्थ है ‘समान’ तथा ‘वाची’ का अर्थ है ‘बो​ले जाने वाले’ अर्थात

समान बोले जाने वाले शब्दों को हम पर्यायवाची शब्द या समानार्थी शब्द कहते है।

पर्यायवाची शब्द के उदाहरण :

• उदय - उद्गम, जन्म, उद्भव, आविर्भाव, उत्पत्ति।
• कुसुम - पुष्प, फूल, प्रसून, पुहुप।
• अंतर - भिन्नता, असमानता, भेद, फर्क।
• पत्ता - पत्ती, पात, पाती, पल्लव, पर्ण।

The correct answer is No improvement​.

Key Points

• In a sentence, the verb is used according to person and number.
• The verb always conforms to the main subject of the sentence.
• In the given sentence, the main subject is the year '2020' which is singular.
• Hence, the auxiliary verb will also be singular i.e. 'is going' as the given sentence is in the present tense (as suggested by the verb 'believe' used in the former part of the sentence).

​Correct Sentence: Some people believe that 2020 is going to be a very significant year in our history.

 ​​​​

Additional Information  

• If an article is used before every subject, it denotes different people/things. Hence, a plural verb will be used.
• Example:
• ​The writer and the poet has come**. (incorrect)
• ​The writer and the poet have come. (correct)

Given:

Cost of first variety of rice = Rs. 128 per kg.

Cost of second variety of rice = Rs. 143 per kg.

Cost of the mixture = Rs. 137.75 per kg.

Calculation:

Required ratio

⇒ 5.25 : 9.75

⇒ 525 : 975

⇒ 7 : 13

∴ The grocer must mix the two varieties of rice in the ratio 7 : 13.

The correct answer is Ethanol

• Ethanol is an active ingredient in all alcoholic drinks.

Key Points

• Ethanol is a member of a class of organic compounds that are given the general name alcohol.
• Its molecular formula is C2H5OH.
• It is also called ethyl alcohol.
• Ethanol is also the intoxicating ingredient of many alcoholic beverages such as beer, wine, and distilled spirits.
• As an industrial chemical it is used as a solvent, in the synthesis of other organic chemicals, and as an additive for automotive gasoline.

Additional Information

• Pentane is an organic compound that is a clear colorless liquid. It is an alkane with five carbon atoms.
• Butane is an alkane with the formula C₄H₁₀. It is a colorless gas with a faint petroleum-like odor.
• Propane is a flammable hydrocarbon gas. It is commonly used for fuel in heating, cooking, hot water and vehicles.

The correct answer is: 'Tamil' 

Key Points

• Authors of the Sangam canon, The first known written Tamil was called Sangam, variously spelled cankam, chankam, and shangam.
• It is believed that Sangam was written between the 1^st and 4^th centuries CE in one of three literary schools (chankams) in Madurai, India.
• According to legend, the first Tamil Sangam was presided over by the ancient Tamil leader Siddhar Agastyar and held in Madurai. The Sangam Age describes this time frame.

Additional Information

• Sangam is a term created by later academics.
• There are three Sangams mentioned in Tamil mythology:
• The Madurai
• Kapadapura
• Thenmadurai
• There was a time when the poetry of the Sangam was considered to be that of the nobility. Sangam signifies "association" when taken at face value.
• Sangam literature is the literary term for the works of ancient Tamil authors. This writing system is the oldest example of literature from South India.

वाक्य में रेखांकित शब्द मृदुभाषी का सही विलोम शब्द "कटुभाषी" है। अन्य विकल्प असंगत है। 

Key Points

• वाक्य- सज्जन मृदुभाषी होते हैं लेकिन टुर्जन _______ होते हैं।
• इस वाक्य में रेखांकित शब्द मृदुभाषी का विलोम कटुभाषी होगा।
• मृदुभाषी का अर्थ- मृदु वचन बोलनेवाला।
• कटुभाषी का अर्थ- कड़वी बात बोलने वाला।

Important Pointsअन्य विकल्प- 

The erroneous part is 'take a sharpest turn'.

Key Points

• The given sentence is grammatically incorrect.
• Here, 'take the sharpest turn' should be used instead of 'take a sharpest turn'.
• The given sentence is an example of a Superlative Degree.
• We know that the definite article 'the' is always used before a superlative degree. Here, in the given question 'sharpest' is a superlative degree of 'sharp'.
• Superlative Degree: This degree denotes the highest quality and is used when one thing/person is compared to all other things/ persons. 
• Example: Mohan is the smartest boy in the class.
• Therefore, the correct answer is Option 4. 

​

Correct Answer: Go to the ninth block on the left-hand side and take the sharpest turn to reach Bunny’s house on the right.

Shortcut Trick

Since time period is same (5 years), Profit Ratio = Investment Ratio.

Ratio of A : B = 36,000 : 58,000 = 18 : 29.

Total units = 18 + 29 = 47 units.

47 units = ₹94,000 → 1 unit = ₹2,000.

B's share = 29 units = 29 × 2,000 = ₹58,000.

∴ The correct answer is ₹58,000.

Alternate Method

Given:

Investment of A = ₹36,000

Investment of B = ₹58,000

Time period = 5 years

Total Profit = ₹94,000

Formula Used:

Profit Share Ratio = (Investment_A × Time_A) : (Investment_B × Time_B)

A: ₹36,000 18 units

B: ₹58,000 29 units

Total Ratio: 47 Profit: ₹94k

Calculations:

⇒ Profit Ratio A : B = (36000 × 5) : (58000 × 5)

⇒ Profit Ratio A : B = 36 : 58 = 18 : 29

⇒ Sum of ratio parts = 18 + 29 = 47

⇒ Total Profit = ₹94,000

⇒ B's Share = (29 ÷ 47) × 94,000

⇒ B's Share = 29 × 2,000

⇒ B's Share = ₹58,000

∴ The correct answer is ₹58,000.

Additional Information

Basic Partnership Law

Profit is always distributed in the ratio of the product of capital and the time for which it was invested (P = C × T).

Case of Equal Time

When the time period for all partners is identical, the profit sharing ratio is exactly the same as the investment ratio (P₁ : P₂ = C₁ : C₂).

Working vs Sleeping Partner

A working partner manages the business and may receive a fixed salary or commission before the remaining profit is divided according to investment ratios.

The correct answer is rise a little higher.

Key Points

• Buoyant force
• ​The buoyant force is an upward force on an object that is wholly or partially immersed in a fluid.
• Due to the force of buoyancy, a body partially or wholly immersed in a liquid tends to lose its weight, that is, it appears to be lighter.
• Sea water is denser than river water.
• A ship experiences more buoyant force in seawater than in river and hence the volume of the ship submerged in water decreases to balance the weight of the ship.
• In Sea water density is higher than river water that's why a ship experiences more buoyant force in sea water.
• So when it goes from the river to the sea it ​rises a little higher.