(d) Yajurveda
Vedas: The Vedas are the earliest surviving literature of the Indian subcontinent.
There are four Vedas: the Rig Veda, the Sama Veda, the Yajur Veda, and the Atharva Veda.
Yajurveda: Stands to mean ‘Worship Knowledge’, Yajurveda dates back to 1100-800 BCE; corresponding with Samaveda. It compiles ritual-offering mantras/chants. These chants were offered by the priest alongside a person who used to perform a ritual (in most cases yajna fire.)
It has two types – Krishna (Black/Dark) & Shukla (White/Bright)
Krishna Yajurveda has an un-arranged, unclear, motley collection of verses
Shukla Yajurveda has arranged and clear verses.

(b) Only two
The National Security Council (NSC) of India is an executive government agency that advises the Prime Minister’s Office on national security and strategic interest. The NSC is the highest agency in the country that handles internal and external security, military affairs, and more. The NSC was established in 1998.
The NSC is headed by the Prime Minister and the National Security Advisor (NSA) is its Secretary. The NSA also serves as the Prime Minister’s Special Interlocutor with China and the envoy to Pakistan and Israel on security affairs.
The NSC exercises its power through the National Security Council Secretariat, which has four verticals:
• Strategic Planning
• Internal Affairs
• Intelligence and Technology
• Military

(c) Indonesia
Kawah Ijen Crater Lake is the world’s largest acidic lake, located in East Java, Indonesia. It’s part of the larger Ijen volcano complex, which includes other craters.
The lake’s turquoise color comes from high concentrations of dissolved sulfuric acid and other minerals. It’s easily visible from space and has a pH as low as 0.5, similar to car battery acid. The lake also emits hot, flammable sulfurous gases that ignite upon contact with Earth’s oxygen-rich atmosphere. The gases burn with an eerie, blue flame, creating an enchanting nighttime spectacle.

(c) 1 and 4
Semiconductors are materials which have a conductivity between conductors (generally metals) and nonconductors or insulators (such as most ceramics). Semiconductors can be pure elements, such as silicon or germanium, or compounds such as gallium arsenide or cadmium selenide.
Silicon is most commonly used in manufacturing semiconductor devices. Earlier, the use of germanium was widespread, but silicon has replaced it due to its thermal hypersensitivity
Semiconductors are used in the manufacturing of various kinds of electronic devices, including diodes, transistors, and integrated circuits. They are also used in a range of applications, including electronic products, IT hardware, defense technology, industrial electronics, medical electronics, automation, and Internet of Things (IoT). Semiconductors are vital for electronics and computing, but there’s a global shortage due to high demand exceeding supply. This shortage impacts economic growth and jobs.

(d) All four
The Central Consumer Protection Authority (CCPA) is a regulatory body that protects and enforces consumer rights. It was established in 2020 under the Consumer Protection Act of 2019. The CCPA works under the administrative control of the Ministry of Consumer Affairs.
The CCPA’s responsibilities include:
• Investigating violations of consumer rights and initiating complaints and prosecutions
• Ordering the recall of unsafe goods and services
• Ordering the discontinuation of unfair trade practices and misleading advertisements
• Imposing penalties on manufacturers, endorsers, and publishers of misleading advertisements
The complaint shall be filed within two years from the date on which the cause of action has arisen. This would mean two years from the day the deficiency in service or defect in goods has arisen/detected. This is also known as the limitation period for filing the complaint.