Explore topic-wise InterviewSolutions in Current Affairs.

Human ‘want’ is an effective desire for a particular thing, which can be satisfied by msiking an effort to acquire it.

According to Adam Smith, “Economics is concerned with “an Inquiry into the nature and causes of wealth of nations” and it is related to the laws of production, exchange, distribution and consumption of wealth”.

Correct option is (1) a, b and d

According to Robbins, “Economics is the science which studies human behaviour as a relationship between ends and scarce means which have alternative uses.”

The main features of wealth definition of economics are:

1. Study of Wealth : Economics is the study of wealth only. The main object of economics is to examine how people earn wealth and spend wealth.

2. Causes of Wealth : Economics seek to examine causes which lead to increase in wealth. Wealth can be increased by its production and accumulation.

3. Economic Man : The wealth definition of economics takes the notion of economic man who is aware of his self-interest. The economic man tries to achieve his self-interest by increasing his material gains through acquisition of wealth.

Capitalist, Socialist and Mixed Economy are the types of economy at the global level

In the book ‘Wealth of Nations’ Adam Smith describes Economics as ‘the science of wealth’.

Adam Smith is known as Father of Economics.

Hunting was the basis of early man’s livelihood.

Scarcity means that we do not and cannot have enough to satisfy our every desire. It means that goods are scarce relative to their wants. Scarcity is a key factor of economic life.

Individual unit.

Since resources are limited, society has to choose between the alternative uses of the available resources. This is known as the Problem of Choice.

1. What to produce The type and quantity of various goods produced depends upon the resource availability on the one hand. 

2. How to produce Weather to use a technology that uses more labour or capital is to be decided by the society. 

3. For whom to produce Every society had to decide the distribution of scarce resources and goods and services among all individuals.

1. Recognize the scarcity of resources against the unlimited wants. 

2. Identifying more important and less importation. 

3. Economize (save) on the use of resources. 

4. Engage in economic activity to support 

5. Development and welfare programs 

6. Poverty, unemployment, inflation etc and try to provide solutions to same the government which is responsible for maintaining law and order and providing same.

Management of individual or family finances is related to the economic factor of ‘income and expenditure.

Correct Answer is: d) consumers

Utility refers to want-satisfying power of a commodity. According to Prof. Hibdon, “Utility is the ability of goods to satisfy a want.”

Theory of cost.

Let the numbers be ‘a’ and ‘b’

Given, of two numbers is 1000 and the difference between their squares is 256000

⇒ a + b = 1000 ---- (1)

and

⇒ a² – b² = 25600

⇒ (a + b)(a – b) = 25600

[From 1]

⇒ 1000(a - b) = 256000

⇒ a – b = 256 ----- (2)

Adding (1) and (2)

⇒ 2a = 1256

⇒ a = 628

From (1)

628 + b = 1000

⇒ b = 1000 - 628 = 372

Correct option is (b) time, labour

Correct option is (d) World

Correct option is (c) three

Germany, Japan and USA are the examples of countries which have adopted Capitalistic economy.

When generalization is made on the basis of reasoning (logic), it is called Priori Method.

Let’s assume the two numbers be x and y. And also assume that x is greater than or equal to y. 

So as per the question, we can write the sum of the two numbers as 

x + y = 1000 ……….. (i) 

Again it’s given that, the difference between the squares of the two numbers, thus writing it 

x² – y² = 256000

⇒ (x + y) (x – y) = 256000

⇒ 1000(x - y) = 256000 

⇒ x – y = 256000/1000 

⇒ x – y = 256 ………….. (ii) 

By solving (i) and (ii), we can find the two numbers 

On adding the equations (i) and (ii), we get; 

(x + y) + (x - y) = 1000 + 256 

⇒ x + y + x – y =1256 

⇒ 2x = 1256 

⇒ x = 1256/ 2 

⇒ x = 628 

Now, putting the value of x in equation (i), we get 

628 + y =1000 

⇒ y = 1000 – 628 

⇒ y = 372 

Hence, the two required numbers are 628 and 372.

Let the tens and the units digits of the required number be x and y, respectively. 

Required number = (10x + y) 

10x + y = 4(x + y) + 3 

⇒10x + y = 4x + 4y + 3 

⇒ 6x – 3y = 3 

⇒ 2x –y = 1 ……….(i) 

Again, we have: 

10x + y + 18 = 10y + x 

⇒9x – 9y = -18 

⇒x – y = -2 ……..(ii) 

On subtracting (ii) from (i), we get: 

x = 3 

On substituting x = 3 in (i) we get 

2 × 3 –y = 1 

⇒ y = 6 – 1 = 5 

Required number = (10x + y) = 10 × 3 + 5 = 30 + 5 = 35 

Hence, the required number is 35

We know: 

Dividend = Divisor × Quotient + Remainder 

Let the tens and the units digits of the required number be x and y, respectively. 

Required number = (10x + y) 

10x + y = (x + y) × 6 + 0 

⇒10x – 6x + y – 6y = 0 

⇒ 4x – 5y = 0 …….(i) 

Number obtained on reversing its digits = (10y + x) 

∴ 10x + y - 9 = 10y + x 

⇒9x – 9y = 9 

⇒x – y = 1 ……..(ii) 

On multiplying (ii) by 5, we get: 

5x – 5y = 5 ……..(iii) 

On subtracting (i) from (iii), we get: 

x = 5 

On substituting x = 5 in (i) we get 

4 × 5 – 5y = 0 

⇒ 20 - 5y = 0 

⇒ y = 4 

∴ The number = (10x + y) = 10 × 5 + 4 = 50 + 4 = 54 

Hence, the required number is 54.

Let’s assume the digit at unit’s place is x and ten’s place is y. 

Thus from the question, the number we need to find is 10y + x. 

From the question since the two digits of the number are differing by 3. Therefore, 

x – y = ±3 …………. (i) 

And, after reversing the digits, the number so obtained is 10x + y. 

Again it’s given from the question that, the sum of the numbers obtained by reversing the digit’s places and the original number is 99. Thus, this can be written as; 

(10x + y) + (I0y + x) = 99 

⇒ 10x + y + 10y + x = 99 

⇒ 11x + 11y = 99 

⇒ 11(x + y) = 99 

⇒ x + y = 99/11

⇒ x + y = 9 …………… (ii) 

So, finally we have two sets of systems of equations to solve. Those are, 

x – y = 3 and x + y = 9 

x – y = -3 and x + y = 9 

Now, let’s solve the first set of system of equations; 

x – y = 3 ……….. (iii) 

x + y = 9 ………. (iv) 

Adding the equations (iii) and (iv), we get; 

(x – y) + (x + y) = 3 + 9 

⇒ x – y + x + y =12 

⇒ 2x = 12 

⇒ x = 12/2

⇒ x = 6 

Putting the value of x in equation (iii), we find y 

6 – y = 3 

⇒ y = 6 – 3 

⇒ y = 3 

Hence, when considering this set the required number should be 10 x 3 + 6 = 36 

Now, when solving the second set of system of equations, 

x – y = –3 ……….(v) 

x + y = 9 …………(vi) 

Adding the equations (v) and (vi), we get; 

(x – y) + (x + y) = –3 + 9 

x – y + x + y = 6 

2x = 6 

x = 3 

Putting the value of x in equation 5, we get; 

3 – y = -3 

⇒ y = 3 + 3 

⇒ y = 6 

Hence, when considering this set the required number should be 10 x 6 + 3 = 63 

Therefore, there are two such numbers for the given question.

Let the tens and the units digits of the required number be x and y, respectively. 

Required number = (10x + y) x + y = 15 ……….(i) 

Number obtained on reversing its digits = (10y + x) 

∴ (10y + x) - (10x + y) = 9 

⇒10y + x – 10x – y = 9 

⇒9y – 9x = 9

⇒y – x = 1 ……..(ii) 

On adding (i) and (ii), we get: 

2y = 16 

⇒y = 8 

On substituting y = 8 in (i) we get 

x + 8 = 15 

⇒ x = (15 - 8) = 7 

Number = (10x + y) = 10 × 7 + 8 = 70 + 8 = 78 

Hence, the required number is 78.

1. Women had a secondary position in the Indian social system. 

2. They were subjected to many injustices because of evil practices. 

3. In the 20th century, many reforms were initiated for the betterment of women. 

4. The reform movement was led by women and institutions formed by them. 

5. They fought for issues such as the right to inheritance, right to vote through the medium of these institutions. 

6. The involvement of women went on increasing. They played an active role in the national movement and in the revolutionary movement.

7. Due to the reform movement, women were included in the Provincial Ministries.

(i) Babasaheb Bole

(ii) Deenbandhu Mitra.

Narayan Meghaji Lokhande

Let the tens and the units digits of the required number be x and y, respectively. 

Required number = (10x + y) 

x + y = 15 ……….(i) 

Number obtained on reversing its digits = (10y + x) 

∴ (10y + x) - (10x + y) = 9 

⇒ 10y + x – 10x – y = 9 

⇒ 9y – 9x = 9

⇒y – x = 1 ……..(ii) 

On adding (i) and (ii), we get: 

2y = 16 

⇒y = 8 

On substituting y = 8 in (i) we get 

x + 8 = 15 

⇒ x = (15 - 8) = 7 

Number = (10x + y) = 10 × 7 + 8 = 70 + 8 = 78 

Hence, the required number is 78.

Let the tens and the units digits of the required number be x and y, respectively. 

Required number = (10x + y) 

10x + y = 7(x + y) 

10x + 7y = 7x + 7y or 3x – 6y = 0 ……….(i) 

Number obtained on reversing its digits = (10y + x) 

(10x + y) - 27 = (10y + x) 

⇒10x – x + y – 10y = 27 

⇒9x – 9y = 27 

⇒9(x – y) = 27 

⇒x – y = 3 ……..(ii) 

On multiplying (ii) by 6, we get: 

6x – 6y = 18 ………(iii) 

On subtracting (i) from (ii), we get: 

3x = 18 

⇒ x = 6 

On substituting x = 6 in (i) we get 

3 × 6 – 6y = 0 

⇒ 18 – 6y = 0 

⇒ 6y = 18 

⇒ y = 3 

Number = (10x + y) = 10 × 6 + 3 = 60 + 3 = 63 

Hence, the required number is 63.

Shivram Janbci Kamble

(c) x = 3, y = 2

The given system of equations is 

2x + 3y = 12 ……..(i) 

3x – 2y = 5 ……..(ii) 

Multiplying (i) by 2 and (ii) by 3 and then adding, we get

4x + 9x = 24 + 15 

⇒ x = 39/13 = 3 

Now, putting x = 3 in (i), we have 

2 × 3 + 3y = 12 ⇒ y = 12−6/3 = 2 

Thus, x = 3 and y = 2.

Given that x = 2 and y = 1 is a solution of 2x + 3y = k . 

∴ 2(2) + 3(1) = k 

⇒ 4 + 3 = k 

⇒ k = .7 ’ 

∴ The equation becomes 2x + 3y = 7

Two more solutions are (0, 7/3) and (1, 5/3)

correct  answer is (c) x = 6, y = 4

The given system of equations is 

x – y = 2 ……..(i) 

x + y = 10 ……..(ii) 

Adding (i) and (ii), we get 

2x = 12 ⇒ x = 6 

Now, putting x = 6 in (ii), we have 

6 + y = 10 ⇒ y = 10 – 6 = 4 

Thus, x = 6 and y = 4.

Correct option is (D) 1

\(\because\) (2, 2) is a solution of 3x + ay = 8.

\(\therefore\) \(3\times2+a\times2=8\)

\(\Rightarrow\) 2a = 8 - 6 = 2

\(\Rightarrow\) a = \(\frac22\) = 1

Correct option is D) 1

The given equations are:

\(\frac{bx}a+\frac{ay}b=a^2+b^2\)

By taking LCM, we get: 

b²+ a²y/ab = a² + b² 

⇒ b² x + a² y = (ab)a² + b² 

⇒b² x + a² y = a³ b +ab³ …..(i) 

Also, x + y = 2ab …….(ii) 

On multiplying (ii) by a² , we get: 

a² x + a² y = 2a³ b ……(iii) 

On subtracting (iii) from (i), we get: 

(b² – a²)x = a³ b +ab³ – 2a³ b 

⇒ (b² – a²)x = -a³ b +ab³ 

⇒ (b² – a² )x = ab(b² – a²)

⇒(b² – a²)x = ab(b² – a²) 

∴x = ab(b²− a²) (b²− a²) = ab 

On substituting x = ab in (i), we get: 

b² (ab) + a² y = a³ b + ab³ 

⇒ a² y = a³ b 

⇒ a³b/a² = ab 

Hence, the solution is x = ab and y = ab.

The given equations are: 

bx/a - ay/b + a + b = 0 

By taking LCM, we get: 

b²x – a²y = - a²b – b²a …..(i) 

and bx – ay + 2ab = 0 

bx – ay = -2ab …….(ii) 

On multiplying (ii) by a, we get: 

abx – a²y = - 2a²b ……(iii) 

On subtracting (i) from (iii), we get: 

abx – b²x = 2a²b + a²b + b²a = - a²b + b²a

⇒x(ab – b²) = -ab(a – b) 

⇒x(a – b)b = -ab(a – b) 

∴x = −ab(a−b)/(a−b)b = -a 

On substituting x = -a in (i), we get: 

b² (-a) – a² y = -a² b – b² a 

⇒ -b²a – a²y = -a²b – b²a 

⇒ -a² y = -a² b 

⇒ y = b 

Hence, the solution is x = -a and y = b.

x + 4y – 7 = 0 

For, x = -λ and y = \(\frac{5}{2}\) to be a solution 

⇒ -λ + 4 × (5/2) – 7 = 0 

⇒ λ = 10 – 7 = 3

Given the line is 

(x - 3)/3 = (y - 8)/-1 = (z - 3)/1

(x + 3)/-3 = (y + 7)/2 = (z - 6)/4

The standard equation of a line 

x₁ = 3, y₁ = 8, z₁ = 3

x₂ = -3, y₂ = -7, z₂ = 6

Thus, the shortest distance 

d = |(x₂ - x₁,y₂ - y₁,z₂ - z₁),(a₁,b₁,c₁),(a₂,b₂,c₂)|

= |(6,15,-3),(3,-1,1),(-3,2,4)|/√((-6)² + (15)² + (3)²) 

= (6(-4 - 2) -15(12 + 3) - 3(6 - 3))/√(36 + 225 + 9)

= (-36 - 225 - 9)/√270 = -270/√270 = -√270

The correct option is (B) B) Gamma Rays.

Increasing order of wavelength: 

Gamma rays < X-rays < Blue light < Red light < Radio waves 

Thus gamma ray has the shortest wavelength.

The Correct option is C. γ-rays 

Correct Answer is: D) Nichrome

Heating coils are commonly made up of metal alloys which are a combination of two or more elements. The most commonly used metal alloy is “Nichrome”. Nichrome is an alloy of nickel (80%) and chromium (20%).

Given the equation,

(11 - x)/p = (3y - 3)/2 = (17 - 2)/5 ...(i)

(x - 11)/-p = (y - 1)/(2/3) = (2 - 17)/-5

(Middle term dividing numerator denominator by 3)

Again linear equation,

(x - 22)/3p = (2y - 7)/(2 + p) = (2 - 100)/(6/5)

(x - 22)/3p = (y - (7/2))/((2 + p)/2) = ((2 - 100)/(6/5) ...(ii)

line (i) and (ii) perpendicular if 

a₁a₂ + b₁b₂ + c₁c₂ = 0

-p(3p) + (2/3) x (27p/2) + (-5 x (6/5)) = 0

-3p² + 9p - 6 = 0

3p² - 9p + 6 = 0 (take sign common)

3p² - 6p - 3p + 6 = 0

3p(p - 2) - 3(p - 2) = 0

(p - 2) (3p - 3) = 0

when p - 2 = 0 then p = 2

when 3p - 3 = 0 

then 3p = 3

p = 3/3 = 1

p = 1 

∴ p = 1, 2

Correct Answer is: C) A - m

SI unit of pole strength is ampere-metre and SI unit of magnetic moment is ampere meter²

Correct Answer is: (c) C/3

1/c series = 1/c₁ + 1/c₂ +1/c₃

c₁ = c₂ = c₃ = c

1/c + 1/c + 1/c

= c/3