Explanation

Organic chemistry is the branch of chemistry that focuses on the structure, properties, composition, reactions, and preparation of compounds containing carbon.

While many organic compounds also contain hydrogen, oxygen, nitrogen, and other elements,

The defining element in organic chemistry is carbon.

Explanation

Students passed in English = 80%

Students passed in Math's = 85%

Students passed in both subjects = 73%

Then, the number of students who passed at least one subject

= (80+85)-73

= 92%.

[The percentage of students who passed in English and Maths individually, has already included the percentage of students who passed in both subjects. So, We are subtracting the percentage of students who have passed both subjects to find out the percentage of students who at least passed one subject.]

Thus, students failed in both subjects = 100-92 = 8%.

Explanation

 The 2nd RCEP Summit was held in Singapore on November 14, 2018. 

Additional information 

The Regional Comprehensive Economic Partnership is a free trade agreement among the 15 Members 

All ten members of ASEAN (excludes candidate member  East Timor):

1 Brunei

 2 Cambodia

3 Indonesia

4 Laos

5 Malaysia

6 Myanmar

 7 Philippines

 8 Singapore

9 Thailand

10 Vietnam

The three East Asian members of ASEAN Plus Three:

11 China

12 Japan

13 South Korea

The two Oceanian members of ASEAN Plus Six:

14 Australia

15 New Zealand

The 15 member countries account for about 30% of the world's population (2.2 billion people) and 30% of global GDP ($29.7 trillion)

The RCEP was signed virtually on November 15, 2020, on the sidelines of the annual summit of the 10-nation Association of Southeast Asian Nations.

RCEP) was signed virtually, and organized by Vietnam

Effective: 1 January 2022

Language: English 

Explanation

Mercury is used as a thermometric fluid because it has several ideal properties:

1. High Boiling Point (B.P)

   • Mercury doesn't evaporate easily, which makes it suitable for measuring high temperatures.

2. Low Freezing Point (not high M.P)

   • Mercury has a low melting point (−38.83°C), which helps in measuring low temperatures, though this limits it in very cold environments.

3. Stable and Uniform Coefficient of Expansion

   • Mercury expands uniformly with temperature, which gives accurate and consistent readings.

4. Visibility and Non-wettability

   • Mercury is shiny and opaque, so it's easy to see in a glass tube.

   • It doesn't stick to glass, which keeps the readings clean and precise.

Explanation

The guitar is a musical instrument of the chordophone family.

The standard guitar has following six strings:

1. E

2. A

3. D

4. G

5. B

6. E

Explanation

The sentence should read: "We missed the bus. Now we'll have to walk."

This indicates that the bus has departed and you were not able to board it, so you will need to walk instead.

Explanation

PIA flight landed in china in 1963

 PIA, in 1964 became the first non-Communist airline to fly to China

PIA was founded on 29 October 1946 as Orient Airways,

Orient Airways Ltd. was an airline established in 1946 new name Pakistan International Airlines in 1955

The airline shifted operations to the newly independent state of Pakistan in 1947.

Pakistan International Airlines is an international airline of Pakistan

SH19-8-2023

Explanation

Frogs have a three-chambered heart.

• It consists of two atria and one ventricle.
• The right atrium receives deoxygenated blood from the body organs.
• The left atrium receives oxygenated blood from the skin and lungs.
• Both the atria send the blood to the ventricle.
• Since there is only one ventricle there is the mixing of both oxygenated blood and deoxygenated blood

Sh18-8-2023

Explanation

A rectifier is an electrical device that converts Alternating Current (AC) into Direct Current (DC).

It works by allowing current to flow only in one direction using diodes.

Explanation

DRAM memories need a refresh.

Dynamic Random Access Memory (DRAM).

DRAM must be refreshed many times per second to store information, otherwise, it will lose what it is holding.

DRAM is the most common type of memory in use today.

ND18-4-2023