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 .