Correct Answer: $71 \frac{3}{7} \%$

Solution : According to the question,
Percentage Increase
$= \frac{\text{New Value−Old Value}}{\text{Old Value}} × 100$
$= \frac{12000 − 7000}{7000} × 100$
$= \frac{5000}{7000}× 100$
$ = 71\frac{3}{7}\%$
Hence, the correct answer is $71\frac{3}{7}\%$.

Correct Answer: Alfred Werner

Solution : The correct answer is Alfred Werner.

Alfred Werner's theory propounded that the ions/groups bonded to the metal by secondary bonding have spatial arrangements corresponding to different characteristic coordination numbers. This theory states that the transition metal cation will have two valencies: a primary and a secondary. Alfred Werner won the Nobel Prize in chemistry in 1913.

Correct Answer: 21 : 32

Solution : The number of families whose monthly expenditure on education is below Rs. 3000 is
= 23 + 35 + 47
= 105
The number of families whose monthly expenditure on education is Rs. 4,000 or above but less than Rs. 5,500 is
= 65 + 52 + 43
= 160
Required ratio = 105 : 160
= 21 : 32
Hence, the correct answer is 21 : 32.

Correct Answer:

Solution : In the given series, the figure is rotating 90° anticlockwise. Also, the right-angled triangle is moving clockwise at the corners.
Thus, the missing part of the figure is –

Therefore, the complete figure is as follows – 

Hence, the third option is correct.

Correct Answer: 24 : 4

Solution : Let's check each option –

First option: 34 : 3; 34 is not divisible by 3.
Second option: 17 : 6; 17 is not divisible by 6.
Third option: 24 : 4; 24 is divisible by 4.
Fourth option: 2 : 51; 51 is not divisible by 2.

So, the third option is different from the other three options as here first term is divisible by the second term.  Hence, the third option is correct.

Correct Answer: Kiran

Solution : Given:
(I) Six students Prateek, Sameer, Kabir, Ziya, Joseph, and Kiran are sitting around a circular table facing the centre (not necessarily in the same order). Prateek is an immediate neighbour of both Sameer and Kabir.

(II) Ziya is sitting second to the right of Sameer. Kiran is sitting third to the left of Kabir. Joseph is an immediate neighbour of both Ziya and Kabir.
 

So, Kiran and Joseph are the immediate neighbours of Ziya. Hence, the fourth option is correct. 
 

Correct Answer: Rs. 600

Solution : Let the initial cost of the radio be $x$.
According to the question,
$x+\frac{20x}{100}+60=x+\frac{30x}{100}$
⇒ $60=\frac{30x}{100}-\frac{20x}{100}$
⇒ $60=\frac{10x}{100}$
⇒ $x=600$
Hence, the correct answer is Rs. 600.

Correct Answer: 22 km

Solution :

In the above figure, O is the starting point and T is the finishing point.
A's distance from his initial place in the horizontal direction is (OP + QR).
OP + QR = 7 + 15 = 22 km

So, A is 22 km from the starting point in the horizontal direction. Hence, the second option is correct. 

Correct Answer: 2 km

Solution : Firstly, we will draw the diagram as per the given instructions –

In the above figure, O is the starting point and E is the finishing point. So, OE is M's distance from the starting point to the final point.
OE = CD – AB
OE = 7 – 5 = 2 km

So, M's distance from the starting point to the final point is 2 km. Hence, the second option is correct. 

Correct Answer: Connoiseur

Solution : The correct choice is the third option.

In this case, the misspelt word is "connoiseur", which should be spelt as connoisseur, which refers to an expert judge in matters of taste, someone who has expert knowledge and keen discrimination in a particular field, often related to art, food, or culture.

The meanings of the other options are as follows:

• Diarrhoea: This refers to a condition characterised by frequent and liquid bowel movements.
• Pseudonym: This refers to a fictitious name used by an author or a pen name used by individuals to conceal their real identity.
• Perseverance: This refers to the persistence and determination to continue doing something despite challenges or difficulties.