Explanation:

This question asks to identify the incorrectly spelled word among the given options in Hindi. This tests knowledge of Hindi orthography (vartani). Let's analyze each option: Option (1): "महत्व (Mahatva)". This word is often a point of confusion in Hindi spelling. While 'महत्व' (mahatva) is commonly seen and accepted, the etymologically and grammatically more precise or 'shuddh' (pure) spelling, derived from 'महत्' (mahat - great) + 'त्व' (tva - suffix for abstract noun), is 'महत्त्व' (mahattva), with two half 'त's (त्त्). The presence of two 'त' sounds (one from the root and one from the suffix) is represented by 'त्त्'. Therefore, 'महत्व' with a single half 'त' is considered a less accurate or slightly incorrect spelling in strict orthographic rules, making it the most likely 'अशुद्ध शब्द' (incorrect word) in a competitive exam context where precision is valued. Option (2): "संसत्सदस्य (Sansatsadasya)". This word means 'Member of Parliament'. The spelling 'संसत्सदस्य' is grammatically correct. It is formed from 'संसद्' (Parliament) + 'सदस्य' (member). The 'द्' of 'संसद्' changes to 'त्' when followed by 'स', resulting in 'संसत्सदस्य'. There is no apparent spelling error here. Option (3): "उज्ज्वल (Ujjwal)". This word means 'bright' or 'radiant'. The correct spelling involves two half 'ज's ('ज्ज'). The option 'उज्ज्वल' correctly depicts this. This is a common word tested for spelling, and its given form is correct. Option (4): "दुरवस्था (Duravastha)". This word means 'bad condition' or 'plight'. It is formed from the prefix 'दुः' (dus/dur - bad) + 'अवस्था' (avastha - condition). The 'र्' of the prefix combines with 'अवस्था' to form 'दुरवस्था'. The spelling 'दुरवस्था' is correct. It is often confused with 'दुरावस्था', which would be incorrect. **Conclusion:** While 'महत्व' is frequently used, 'महत्त्व' is considered the more accurate spelling. Given that the question asks for the *incorrect* word, and the other options are definitively correctly spelled, 'महत्व' stands out as the most plausible incorrect option based on strict Hindi orthographic rules. The other words are correctly spelled as presented.