General Science · solved example
A car accelerates uniformly from rest to 20 m/s in 5 seconds. What is its acceleration?
- 4 m/s²Correct
- 5 m/s²
- 10 m/s²
- 2 m/s²
Solution
Acceleration = change in velocity / time = (20 − 0) / 5 = 4 m/s².
BSF Head Constable (RO/RM) | Computer Based Test (CBT)
BSF Head Constable (RO/RM): 16-question practice mock
A compact BSF Head Constable (RO/RM) CBT practice mock: 16 original questions across Physics, Chemistry, Mathematics and English & GK at Class 12 level, each with a worked solution. 0.25 marks deducted per wrong answer on two-mark questions.
Before you start
- 16 questions in 24 minutes on a single clock — a short drill, not the full 100-question CBT.
- Each question carries 2 marks and 0.25 marks are deducted for a wrong answer, matching the BSF HC RO/RM CBT.
- Every question is original, written to the Class 12 PCM pattern, with a worked solution shown after you submit.
Sections in this test
| Section | Questions |
|---|---|
| Physics and ChemistryGeneral Science | 6 |
| MathematicsMathematics | 4 |
| EnglishEnglish Language | 2 |
| General KnowledgeGeneral Awareness | 4 |
Sample questions with worked solutions
A few questions from this test, with the answer key and the method behind it. The full set of 16 runs under a timer, and every solution is on the analysis screen once you submit.
Mathematics · solved example
If x² − 5x + 6 = 0, what is the sum of the roots?
- 5Correct
- 6
- Minus five
- Minus six
Solution
For ax² + bx + c = 0, sum of roots = −b/a. Here −(−5)/1 = 5. The roots are 2 and 3, which also sum to 5.
English Language · solved example
Choose the word most similar in meaning to: PRECISE
- Vague
- ExactCorrect
- Rough
- Approximate
Solution
'Precise' means exact and accurate. 'Exact' is the nearest synonym. Vague, rough and approximate suggest imprecision.
General Awareness · solved example
Which ministry administers the Border Security Force?
- Ministry of Home AffairsCorrect
- Ministry of Defence
- Ministry of External Affairs
- Ministry of Railways
Solution
The BSF is a central armed police force under the Ministry of Home Affairs, not the Ministry of Defence (which runs the Army, Navy and Air Force).
General Science · solved example
What is the SI unit of electric current?
- Volt
- AmpereCorrect
- Ohm
- Watt
Solution
Electric current is measured in amperes (A). Volt is potential difference, ohm is resistance and watt is power.
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How this test is marked
Correct answer
+2
Wrong answer
-0.25
Unanswered
0
Because a blank carries no penalty, guessing only pays when you can eliminate at least two options. The analysis screen after the test shows you exactly where guessing cost you marks.