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• ​Quarrying is the process of removing rock, sand, gravel, or minerals from the ground in order to use them to produce materials for construction or other uses.
• Minerals that lie near the surface are simply dugout, by the process known as quarrying

The correct answer is Quarrying.

• Drilling is a cutting process that uses a drill bit to cut a hole of circular cross-section in solid materials or ground.
• Open Cast Mining is the process under which minerals are mined near the earth's surface.
• Shaft mining is the process where miners dig straight down until they reach their desired depth. 

The correct answer is the Ozone layer - Troposphere.

• Stratosphere
  • The stratosphere starts just above the troposphere and extends to 50 kilometres high.
  • The ozone layer, which absorbs and scatters the solar ultraviolet radiation, is in this layer.
  • The maximum concentration of ozone is found in Stratosphere.
• ​Hence option 4 is correct.

• Golden Rice is a new type of rice that contains beta-carotene (provitamin A), which is converted into vitamin A as needed by the body and gives the grain its golden colour.
• Gene splicing
  • Gene splicing is the process of chemically cutting DNA in one organism and inserting it into the DNA strand of a vector, usually a plasmid.
  • The DNA is cut using special chemicals called restriction enzymes.
  • Through this technique, microorganisms are genetically engineered.
• Renneling is used to separate milk into solid curds (for cheesemaking) and liquid whey, and so it or a substitute is used in the production of most cheeses.

Correct option is A) that

Given:

Let time after which they meet each other be a hour.

⇒ Time taken by Sakira to complete distance = (a + 7.5) hours

⇒ Time taken by Bryan to complete distance = (a + 2.7) hours

Formula:

⇒ Distance = Speed × time

S₁/S₂ =√(T₂/T₁)

Where S₁ and S₂ are the speeds of the object 

T₁ and T₂ are the time to reach their destination after meeting

Calculation:

⇒ Ratio of their time taken = (a + 7.5) : (a + 2.7)

⇒ Ratio of their speeds = (a + 2.7) : ( a + 7.5)    ----(1) 

According to the formula 

S_Sakira/ S_Bryan = √(2.7/7.5)

⇒ SSakira/ SBryan = 3/5    ----(2) 

Now, form (1) and (2), we have    

(a + 2.7) : ( a + 7.5) = 3 : 5

⇒ 5a + 13.5 = 3a + 22.5

⇒ 2a = 9 hours

⇒ a = 4.5 hours

∴ After 4.5 hours they meet each other.

Correct option is D) which

Correct option is B) whose

Correct option is D) to / on

Correct option is D) Come / have

Correct option is C) why

Correct option is B) having / to come

Correct option is B) why

1-f,  2-e,  3-b,  4-h,  5-g,  6-i,  7-d,  8-j,  9-a,  10-c

1-h 

2-c 

3-e 

4-b 

5-g 

6-f 

7-d 

8-j 

9-a 

10-i

Correct option is C) having / round

1-f,  2-b,  3-h,  4-c,  5-e,  6-j,  7-a,  8-g,  9-d,  10-i

Correct option is D) have finished moving

Correct option is A) do

Correct option is B) why

(c) Adam Smith

1-d,  2-e,  3-g,  4-c,  5-j,  6-a,  7-i,  8-h,  9-f,  10-b

(b) Jawaharlal Nehru

(d) Uniform civil code for the country

1-g,  2-f,  3-d,  4-a,  5-c,  6-h,  7-b,  8-e

1- short,  2- tall,  3- small,  4- cheap,  5- thin,  6- old,  7- slow,  8- ugly,  9- down,  10- wide

1- tall,  2- heavy,  3- big,  4- handsome,  5- long,  6- expensive,  7- far,  8- rich,  9- polite,  10- happy

1- clean,  2- tight,  3- sharp,  4- loud,  5- deep,  6- straight,  7- dark,  8- thick,  9- high,  10- wide

Correct option is A) is there

Correct option is B) at / with 

(d) Promotion of cottage industries

(c) Mixed economy

Correct option is B) does

Correct option is D) It is foolish

Correct option is D) aren’t there

Correct option is B) is it

Correct option is C) Can 

Correct option is C) It

Correct option is A) can 

Correct option is B) Why

Correct option is D) herself

Correct option is A) so can Helen

Correct option is B) do you

Given:

 A and B together can do a piece of work in 18 days and B and C can do the same work together in 24 days. The efficiency ratio of A and C is 2 : 1

Concept Used:

Total work = LCM of separate time taken to finish the work

Calculation:

A and B together can do a piece of work in 18 days and B and C can do the same work together in 24 days.

LCM of 18 and 24 is 72

⇒ Total work is 72 units

In 1 hour A and B together can do 72/18 = 4 unit work      ----(1)

In 1 hour B and C together can do 72/24 = 3 unit work      ----(2)

The ratio of efficiency of A and C is 2 : 1

Let, in 1 hour A can do 2 unit work and C can do 1 unit work      ----(3)

Using (1) and (3) get, B can do 2 unit work in 1 hour, which satisfies (2)        

[∵ A = 2 & B = 2 ⇒ A + B = 4

and B = 2 & C = 1 ⇒ B + C = 3]

B alone can do 2 unit work in 1 hour

⇒ To do 72 unit work B alone will take 72/2 = 36 hours

∴ In 36 hour B alone can do the work.

Correct option is C) at 

Concept:

• Cooking is all about preparing food.
• In this, raw materials are converted into ready-made food products for human use. 
• Cooking has many steps, it starts with basic things like cleaning, cutting, preparing, adding ingredients in correct proportions, presenting, etc.

Explanation:​

Cutting the vegetables and then washing these in running water:

• Running water refers to flowing water in rivers and streams.
• These waters may be dirty and contain many harmful substances.
• Washing chopped vegetables in running water may contaminate the vegetables.
• Vegetables should always be cut after washing them in clean water.

Keeping the vegetables in the sunshine for some time before cutting and cooking:

• Keeping vegetables in the sunshine has no proven benefit.
• The dirt, bacteria and other harmful substances are still on the surface of the vegetable.
• Keeping vegetables in the sunshine for a long may result in loss of freshness of the vegetable and they may shrivel.

Cooking the vegetables by deep-frying to kill bacteria:

• Deep frying food is an unhealthy alternative to cooking food.
• Frying vegetables leads to the addition of unhealthy fats that may lead to various diseases.
• The healthiest method of cooking food is by steaming them.
• Steaming food keeps most of the nutrient intact in the vegetable.

Washing the vegetables nicely and then cutting:

• Vegetables must be washed before cutting.
• This removes any dirt which is sticking to the vegetable.
• It removes any bacteria or unwanted and harmful substance that is on the vegetable.

​Thus, washing the vegetables nicely and then cutting them is a good cooking practice.

Correct option is B) had been planning

Correct option is C) were

Correct option is A) for 

Correct option is A) hadn’t been

Correct option is A) hadn’t been

Correct option is B) goes without