ANS:D - Club

Explanation: All except Club are places where people can stay.

ANS:A - Red, Red, Brown, Gold

Resistor colour coding series:

Black   0 
Brown   1 
Red     2 
Orange  3 
Yellow  4 
Green   5 
Blue    6 
Violet  7  
Gray    8   
White   9 
None    20% 
Silver  10% 
Gold    5% 

Therefore Red, Red, Brown, Gold 
           2    2    101    5% 

 = 22 x 10 = 220 ohm 5% (tolerance). 

ANS:B - Sulphuric acid and napthamine

To detect nitrites in sewage, a common method is the Griess test. In this test, sulfanilic acid and N-(1-naphthyl)ethylenediamine dihydrochloride are combined with the sample. If nitrites are present, they react with sulfanilic acid to form a diazonium salt. Then, the diazonium salt reacts with N-(1-naphthyl)ethylenediamine dihydrochloride to produce a pink azo dye. This pink coloration indicates the presence of nitrites. Therefore, the correct answer is: Sulphuric acid and napthamine.

ANS:D - 0001

A mod-16 counter goes through 16 states in one cycle of 16 Pulses. It complete 2 cycles in 32 Pulses. In the rest 5 Pulses, it moves down from 0110 = 6₁₀ - 5₁₀ = 1₁₀ or (001)₂ .

ANS:D - The heat of formation of a compound is defined as the heat of reaction leading to the formation of the compound from its reactants.

The correct statement is: "The heat of formation of a compound is defined as the heat of reaction leading to the formation of the compound from its reactants." This statement accurately describes the concept of heat of formation, which represents the enthalpy change that occurs when one mole of a substance is formed from its elements in their standard states. The heat of formation of a compound refers to the amount of heat released or absorbed when one mole of the compound is formed from its constituent elements in their standard states. This concept is vital in understanding the energetics of chemical reactions and is often denoted by the symbol Δ𝐻𝑓ΔHf​. To explain the statement "The heat of formation of a compound is defined as the heat of reaction leading to the formation of the compound from its reactants," let's break it down:

1. Heat of reaction: This refers to the enthalpy change that occurs during a chemical reaction. It can be either exothermic (heat is released) or endothermic (heat is absorbed). In the context of forming a compound from its constituent elements, the heat of reaction specifically refers to the energy change associated with this process.
2. Formation of the compound from its reactants: This part emphasizes that we are considering the formation of the compound from its individual elements. For example, the heat of formation of water (Δ𝐻𝑓ΔHf​ for H2OH2​O) would involve the reaction of hydrogen gas (H2H2​) and oxygen gas (O2O2​) to produce water (H2OH2​O).

ANS:A - Nidhi S Jain

Nidhi S Jain (IA&AS), an Indian Audit and Accounts Service officer of the 2009 batch, has been appointed as the Chief Vigilance Officer (CVO) of the Cotton Corporation of India for an initial period of three years. She assumes this role from her current position as Director of Audit (Environment & Scientific Departments) at the Mumbai branch office. The Cotton Corporation of India, headquartered in Mumbai and founded in 1970, has Nidhi S Jain as its newly appointed CVO.

ANS:D - USA

US President Joe Biden has announced a new 600-million-dollar arms package to Ukraine.