Correct Answer: $45^{\circ}$

Solution :

Since, an angle subtended by the diameter of a circle at the circumference = $90^{\circ}$
⇒ $\angle$ ACB = $90^{\circ}$
$\angle$ BCD = $\angle$ ACD + $\angle$ ACB = $45^{\circ} + 90^{\circ}=135^{\circ}$
Since the opposite angles of a cyclic quadrilateral are supplementary,
$\angle$ BCD + $\angle$ BAD = $180^{\circ}$
$\therefore \angle$ BAD = $180^{\circ} - 135^{\circ}=45^{\circ}$
Hence, the correct answer is $45^{\circ}$.

Correct Answer: International Non-Violence Day

Solution : The correct answer is International Non-Violence Day.

October 2nd is indeed observed as the International Day of Non-Violence. This date is significant because it marks the birthday of Mahatma Gandhi, the leader of the Indian independence movement against British colonial rule and a pioneer of non-violent resistance, known as "Satyagraha."

Correct Answer: Electrical energy

Solution : The correct option is electrical energy.

The photovoltaic effect is a mechanism used by photovoltaic cells, also referred to as solar cells, to transform light energy from the sun directly into electrical energy. When photons, the light particles hit a solar cell's surface, their energy is transferred to the material's electrons, causing this effect.  These electrons get activated by the energy of the photons, which causes them to flow as an electric current. The generated current can then be harnessed and used to power electrical equipment, or it can be stored in batteries for later use.
 

Correct Answer: $30 \frac{5}{8} \%$

Solution : Share of marks obtained in English = $52^{\circ}$
Share of marks obtained in S.S. = $59^{\circ}$
Share of total marks obtained in English and S.S = $52^{\circ}$+$59^{\circ}$ = $111^{\circ}$------------(i)
Share of marks obtained in Hindi = $72^{\circ}$
Share of marks obtained in Maths = $88^{\circ}$
Share of total marks obtained in Hindi and Maths = $160^{\circ}$ -----------(ii)
Difference in share of marks = $160^{\circ}$–$111^{\circ}$ = $49^{\circ}$
Marks obtained in English and S.S. are less than marks obtained in Hindi and Maths by:
= $\frac{49}{160}×100$
= $30\frac{5}{8}$%
Hence, the correct answer is $30\frac{5}{8}$%.

Correct Answer: 6.6

Solution :
Given:
In triangle MNO, AB is parallel NO and MA = 2.5, AN = 7.5, MB = 2.2
Here, triangles MNO and MAB are similar because angle M in triangle MNO is equal to angle M in triangle MAB.
So, $\frac{MA}{MN}=\frac{MB}{MO}$
⇒ $\frac{2.5}{2.5+7.5}=\frac{2.2}{MO}$
$\therefore MO=8.8$
BO = MO – MB = 8.8 – 2.2 = 6.6
Hence, the correct answer is 6.6.

Correct Answer: Basketball in 2020

Solution : In 2018,
Basketball: 46 + 34 = 80
Football: 42 + 37 = 79
Cricket: 45 + 35 = 80
In 2019,
Basketball: 40 + 41 = 81
Football: 44 + 38 = 82
Cricket: 42 + 32 = 74
In 2020,
Basketball: 43 + 40 = 83
Football: 40 + 32 = 72
Cricket: 44 + 38 = 82
In 2021,
Basketball: 37 + 44 = 81
Football: 43 + 25 = 68
Cricket: 34 + 28 = 62
In 2022,
Basketball: 34 + 41 = 75
Football: 41 + 32 = 73
Cricket: 41 + 39 = 80
It can be seen that in the year 2020, Basketball has the maximum enrollment.
Hence, the correct answer is Basketball in 2020.

Correct Answer: confirm

Solution : The second option is the correct option. The word "confirm" is the most appropriate choice in this context because it means to establish the truth or correctness of something, which is exactly what the physician does with the blood test – they determine whether or not the woman is pregnant.

Term: It typically refers to a specific period

Confer: "Confer" means to grant or bestow something, such as an honour or title, upon someone.

Firm: stronghold or belief in something or someone. All these don't fit in the context.

So the correct sentence is "With a blood test, a physician was able to confirm the woman's pregnancy."

Correct Answer: Adept, demonstration

Solution : The correct choice is the fourth option, "adept, demonstration".

"Adept" and "demonstration" fit perfectly in the sentence. "Adept" means highly skilled or proficient at something and "demonstration" refers to a display or exhibition of how something is done. This helps in conveying the intended meaning that he was so skilled at his job that he was asked to show the visitors how it was done.

The meanings of the other options are as follows:

• "Able" is someone who can do something.
• "Disclosure" means the sharing of information or secrets.
• "Agile" means able to move quickly and easily.
• "Demolition" is the breaking and destroying of structures.
• "Accurate" is something that is correct and precise.
• "Display" is showing or presenting something.

Therefore, the complete sentence is "He was so adept at his job that he was asked to give a demonstration to the visitors".

Correct Answer: To control the level of sugar in the body

Solution : The correct option is - To control the level of sugar in the body.

The pancreatic islets of Langerhans cells generate insulin, a peptide hormone that regulates carbohydrate, lipid, and protein metabolism and promotes cell division and growth through its mitogenic effects.

Insulin helps cells absorb glucose, regulates carbohydrate, lipid, and protein metabolism, and keeps blood sugar levels normal.

Correct Answer: productive

Solution : The correct choice is the fourth option.

Explanation: The term productive means achieving or producing results, which fits well with the context of evaluating social media use. It suggests assessing whether the use of social media contributes to positive and meaningful outcomes.

Therefore, the correct word to fill in the blank (4) is productive.