Tag: science & technology

Ammonium is NH4+ with +1 charge. Phosphate is PO4 with -3 charge. To balance +1 and -3, you need 3 ammonium ions and 1 phosphate: (NH4)3PO4. NH4PO4 doesn't balance charges.

Sachin Tendulkar and Amitabh Bachchan endorsed Pepsi together in a famous campaign. This was their first joint commercial endorsement, bringing together two of India's biggest icons - cricket and Bollywood.

Grasim Industries (formerly Grasim Cements) is promoted by the Aditya Birla Group, making option B correct. The Birla Group is one of India's largest conglomerates with interests in cement, textiles, and other sectors. Bharti Ventures is associated with telecom, Essar with energy and steel, and TATA Group operates independently.

The Gateway of India was built by Gammon India, making option A correct. The historic monument in Mumbai was completed in 1924 to commemorate the visit of King George V and Queen Mary. Gammon was a major construction company during British India. Suzlon is a wind energy company, Britannia is a food brand, and India Cements is in construction materials.

The computer mouse was invented at Xerox PARC (Palo Alto Research Center), making option C correct. Douglas Engelbart created the prototype at Stanford Research Institute, but Xerox developed and commercialized the technology. Microsoft, Logitech, and Dell are peripheral manufacturers, not the original inventor.

Reliance Industries is India's largest synthetic textile producer through its subsidiary Reliance Industries Limited, making option D correct. The company operates the world's largest integrated polyester complex. Grasim is a major player but Reliance is the largest. Aravind Mills and Bombay Dyeing are smaller textile companies.

The Vimal brand was named after Vimal Ambani, Dhirubhai Ambani's nephew, making option A correct. Vimal was Reliance's first textile brand launched in the 1980s. Raymond and Siyaram's are independent brands, while Reid & Taylor is unrelated to the Ambani family.

Google launched the Nexus One smartphone in 2010, making option C correct. It was the first phone in the Nexus line, designed to showcase pure Android experience. Lava, Lemon, and Micromax are Indian smartphone brands, not Google products.