state gov Kerala PSC Degree (Common Preliminary Examination) Mock Test Series 2025 General Knowledge Ecology and Environment Environmental pollution

चेरनोबिल परमाणु दुर्घटना कब हुई?

1
अगस्त 1987
2
अप्रैल 1986
3
अगस्त 1989
4
अप्रैल 1988
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