UPSC CSE Prelims

Correct Option: A (1, 2 and 3 only) Explanation: Benzene is emitted by incomplete combustion such as vehicle exhaust, cigarette smoke and wood smoke; varnishes and polyurethane products are not the canonical benzene sources in this exam classification. Statement / Pair / Item-wise Analysis: 1. Correct - Petrol exhaust and evaporative fuel emissions can contain benzene. 2. Correct - Tobacco smoke is a recognised source of benzene exposure. 3. Correct - Wood combustion can release benzene among volatile organic compounds. 4. Incorrect - Typical furniture varnish emissions are other solvents/VOCs rather than a defining benzene source. 5. Incorrect - Ordinary finished polyurethane products are not a standard direct benzene-exposure source. Option-wise Analysis: A. Correct-includes all and only valid statements/items 1, 2, 3. B. Incorrect-includes incorrect item 4 (Typical furniture varnish emissions are other solvents/VOCs rather than a defining benzene source); omits correct item 1 (Petrol exhaust and evaporative fuel emissions can contain benzene); omits correct item 3 (Wood combustion can release benzene among volatile organic compounds). C. Incorrect-includes incorrect item 4 (Typical furniture varnish emissions are other solvents/VOCs rather than a defining benzene source); omits correct item 2 (Tobacco smoke is a recognised source of benzene exposure). D. Incorrect-includes incorrect item 4 (Typical furniture varnish emissions are other solvents/VOCs rather than a defining benzene source); includes incorrect item 5 (Ordinary finished polyurethane products are not a standard direct benzene-exposure source). Review note: Some solvent formulations may contain benzene impurities, but exam asks likely/common exposure factors.