How to know whether query is using Indexes in oracle?

Please let me know necessary steps to check whether query using indexes.

Try the below and check the explain plan.. See below explain plan using index marked as "RED" font
SET AUTOTRACE TRACEONLY EXPLAIN
SELECT * FROM emp WHERE empno = 7839;
Execution Plan
Plan hash value: 2949544139
| Id  | Operation                   | Name   | Rows  | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT            |        |     1 |    38 |     1   (0)| 00:00:01 |
|   1 |  TABLE ACCESS BY INDEX ROWID| EMP    |     1 |    38 |     1   (0)| 00:00:01 |
|*  2 |   INDEX UNIQUE SCAN         | PK_EMP |     1 |       |     0   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   2 - access("EMPNO"=7839)

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