📘 Introduction
Science is an important and scoring section in competitive exams like OSSSC, SSC, CGL, and other government exams. It mainly includes basic concepts from Physics, Chemistry, and Biology. Questions are generally simple and concept-based, so candidates who understand the fundamentals can easily score good marks.
Topics such as force, motion, energy, atoms, chemical reactions, human body, plants, and environment are frequently asked. Regular practice of MCQs helps in improving understanding and retention. This set of questions is designed in a simple and clear manner so that you can learn quickly and revise effectively.
Science – 100 MCQs (My Real Study Notes for OSSSC Exams)
So, I started preparing Science (Physics, Chemistry, Biology) for OSSSC exams… and honestly, I was scared at first 😅
Like formulas in Physics, reactions in Chemistry, diagrams in Biology — everything felt too much.
But after solving MCQs, I realized something important:
Exam questions are very basic. We just need clarity, not deep theory.
So I changed my approach. And now Science feels much easier.
I’m sharing how I studied — simple, real, and practical.
1. Physics Basics
When I first studied Physics, I thought it’s all about formulas. But actually, many questions are concept-based.
Important topics:
- Force
- Motion
- Work & Energy
- Light & Sound
My simple trick:
Don’t memorize formula first. Understand meaning.
Example:
Force = push or pull
One relatable example:
When you push a door → force
So easy to remember.
Another tip:
Units are important (like Newton, Joule).
2. Chemistry Basics
This part looked tough because of reactions.
But exam questions are simple.
Important topics:
- Elements & Compounds
- Acids, Bases
- Metals & Non-metals
My trick:
- Acid → sour
- Base → bitter
Example:
Lemon → acid
Soap → base
My realization:
Real-life examples help a lot.
3. Biology Basics
This is the most interesting part.
Important topics:
- Human body
- Plants
- Animals
- Diseases
My trick:
Relate to daily life.
Example:
We breathe oxygen → basic concept
Important points:
- Heart pumps blood
- Brain controls body
One insight:
Biology questions are mostly direct.
How I Practice MCQs
Earlier I tried to read everything.
Didn’t work.
Now I do:
- Study one topic
- Solve MCQs
- Check mistakes
- Revise
This improved my score.
MCQs 1–25 (Physics)
1. SI unit of force?
A. Joule
B. Newton
C. Watt
D. Pascal
Answer: B
2. Work = Force × ?
Answer: Distance
3. Unit of energy?
Answer: Joule
4. Speed = Distance / ?
Answer: Time
5. Light travels fastest in?
Answer: Vacuum
(Continue similar pattern…)
MCQs 26–50 (Chemistry)
6. pH value less than 7 means?
Answer: Acid
7. Water formula?
Answer: H₂O
8. Which is metal?
Answer: Iron
9. Acid tastes?
Answer: Sour
10. Base tastes?
Answer: Bitter
MCQs 51–75 (Biology)
11. Heart function?
Answer: Pump blood
12. Human brain controls?
Answer: Body
13. Plants make food by?
Answer: Photosynthesis
14. Gas used in breathing?
Answer: Oxygen
15. Disease caused by virus?
Answer: Dengue
MCQs 76–100 (Mixed Revision)
Includes:
- Units
- Formulas
- Basic concepts
- Daily life examples
Mistakes I Made
1. Thinking Science is tough
But questions are basic.
2. Not revising
Forgot concepts.
3. Ignoring MCQs
Big mistake.
One Small Insight
Science is easy if you understand basics.
No need to go deep.
One Relatable Example
Sometimes I knew answer but forgot unit.
Now I revise units daily.
My Personal Tips
1. Focus on basics
Very important.
2. Practice MCQs
Best way to learn.
3. Use examples
Helps memory.
4. Revise regularly
Don’t skip.
Final Thoughts
Science for OSSSC exams is scoring.
But only if you prepare smartly.
Just remember:
- Understand concepts
- Practice MCQs
- Revise basics
Even 1 hour daily is enough.
MCQ Practice Rules
- Read question carefully
- Don’t overthink
- Revise mistakke
👉 My suggestion: Don’t rush. Do 20–25 questions → take break → revise mistakes.
MCQs 1–25 (Physics Basics)
1. SI unit of force?
A. Joule
B. Newton
C. Watt
D. Pascal
Answer: B
2. Speed = Distance / ?
Answer: Time
3. Unit of energy?
Answer: Joule
4. Unit of power?
Answer: Watt
5. Work = Force × ?
Answer: Distance
6. Light travels fastest in?
Answer: Vacuum
7. Sound travels fastest in?
Answer: Solid
8. SI unit of pressure?
Answer: Pascal
9. Which is a non-contact force?
Answer: Gravity
10. Device to measure temperature?
Answer: Thermometer
11. Unit of frequency?
Answer: Hertz
12. Mirror used in vehicles?
Answer: Convex mirror
13. Energy stored in battery?
Answer: Chemical energy
14. Which force pulls objects to Earth?
Answer: Gravity
15. Speed of light is?
Answer: 3×10⁸ m/s
16. Sound cannot travel in?
Answer: Vacuum
17. SI unit of work?
Answer: Joule
18. Instrument to measure current?
Answer: Ammeter
19. Lens used in magnifying glass?
Answer: Convex lens
20. Motion of pendulum is?
Answer: Oscillatory
21. Heat is a form of?
Answer: Energy
22. Unit of time?
Answer: Second
23. Which is renewable energy?
Answer: Solar
24. Force needed to stop object?
Answer: Opposite force
25. Energy of moving object?
Answer: Kinetic energy
MCQs 26–50 (Chemistry Basics)
26. Water formula?
Answer: H₂O
27. pH < 7 means?
Answer: Acid
28. pH > 7 means?
Answer: Base
29. Acid taste?
Answer: Sour
30. Base taste?
Answer: Bitter
31. Which is metal?
Answer: Iron
32. Which is non-metal?
Answer: Oxygen
33. Symbol of Sodium?
Answer: Na
34. CO₂ is?
Answer: Carbon dioxide
35. Gold symbol?
Answer: Au
36. Gas used in respiration?
Answer: Oxygen
37. LPG full form?
Answer: Liquefied Petroleum Gas
38. Rusting needs?
Answer: Air & water
39. Which is acid?
Answer: HCl
40. Which is base?
Answer: NaOH
41. Milk is?
Answer: Slightly acidic
42. Chemical change example?
Answer: Burning
43. Physical change example?
Answer: Melting ice
44. Smallest unit of element?
Answer: Atom
45. Atomic number means?
Answer: Number of protons
46. Which is liquid metal?
Answer: Mercury
47. Which gas is colorless?
Answer: Oxygen
48. Boiling point of water?
Answer: 100°C
49. Freezing point of water?
Answer: 0°C
50. Air is mixture of?
Answer: Gases
MCQs 51–75 (Biology Basics)
51. Heart function?
Answer: Pump blood
52. Brain controls?
Answer: Body
53. Breathing gas?
Answer: Oxygen
54. Plants make food by?
Answer: Photosynthesis
55. Blood is?
Answer: Liquid tissue
56. Largest organ?
Answer: Skin
57. Smallest bone?
Answer: Ear bone
58. Human teeth number?
Answer: 32
59. Which is vitamin C source?
Answer: Orange
60. Disease caused by virus?
Answer: Dengue
61. Malaria caused by?
Answer: Mosquito
62. RBC function?
Answer: Carry oxygen
63. Which organ purifies blood?
Answer: Kidney
64. Plant breathing through?
Answer: Stomata
65. Sunlight gives?
Answer: Vitamin D
66. Which is protein food?
Answer: Egg
67. Which is herbivore?
Answer: Cow
68. Which is carnivore?
Answer: Tiger
69. Which is omnivore?
Answer: Human
70. Human body temperature?
Answer: 37°C
71. Which organ pumps blood?
Answer: Heart
72. Digestion starts in?
Answer: Mouth
73. Which gas plants release?
Answer: Oxygen
74. Largest gland?
Answer: Liver
75. Which disease affects lungs?
Answer: TB
MCQs 76–100 (Mixed Revision)
76. SI unit of power? → Watt
77. Acid example? → HCl
78. Photosynthesis needs? → Sunlight
79. Energy unit? → Joule
80. Metal example? → Iron
81. Which is base? → NaOH
82. Blood color due to? → Hemoglobin
83. Water boiling point? → 100°C
84. Oxygen used for? → Breathing
85. Electricity unit? → Watt
86. Sound travels in? → Medium
87. Which is renewable? → Solar
88. Which organ controls body? → Brain
89. Rusting is? → Chemical change
90. Plant food process? → Photosynthesis
91. Heart pumps? → Blood
92. Unit of time? → Second
93. Gas in air most? → Nitrogen
94. Which is liquid? → Water
95. Energy stored in food? → Chemical
96. Which is sense organ? → Eye
97. Which vitamin from sun? → D
98. Disease by bacteria? → TB
99. Which is non-metal? → Oxygen
100. Which is natural satellite? → Moon
My Honest Experience After 100 MCQs
When I first solved full 100:
- I felt tired 😅
- Made silly mistakes
- Forgot units
But after 2–3 revisions, everything became easier.
One Small Insight
👉 Same questions repeat in exams
👉 Only language changes
So don’t worry too much.
My Personal Strategy
- Focus on basics
- Revise units daily
- Practice MCQs
- Don’t go too deep
Final Thoughts
Science is actually one of the most scoring subjects in OSSSC exams.
Just remember:
- Clear basics
- Practice regularly
- Revise mistakes
📝 Science MCQs (With Explanation)
🔹 Section 1: Physics
Q1. SI unit of force is:
A. Watt
B. Newton
C. Joule
D. Pascal
Answer: B
Explanation: Force is measured in Newton (N).
Q2. Speed = ?
A. Distance × Time
B. Distance ÷ Time
C. Time ÷ Distance
D. Force × Distance
Answer: B
Explanation: Speed is distance divided by time.
Q3. Unit of energy is:
A. Watt
B. Joule
C. Newton
D. Meter
Answer: B
Explanation: Energy is measured in Joules.
Q4. Gravity pulls objects:
A. Upwards
B. Downwards
C. Sideways
D. Forward
Answer: B
Explanation: Gravity pulls objects toward the Earth.
Q5. Light travels in:
A. Curved path
B. Straight line
C. Circle
D. Zigzag
Answer: B
Explanation: Light travels in straight lines.
👉 Exam Tip: Physics questions are mostly formula-based and easy.
🔹 Section 2: Chemistry
Q6. Water formula is:
A. CO₂
B. H₂O
C. O₂
D. NaCl
Answer: B
Explanation: Water consists of hydrogen and oxygen.
Q7. pH value of neutral substance:
A. 0
B. 7
C. 14
D. 1
Answer: B
Explanation: Neutral substances have pH = 7.
Q8. Common salt is:
A. NaCl
B. HCl
C. H₂SO₄
D. KCl
Answer: A
Explanation: Sodium chloride is common salt.
Q9. Gas essential for breathing:
A. Nitrogen
B. Oxygen
C. Carbon dioxide
D. Hydrogen
Answer: B
Explanation: Oxygen is required for respiration.
Q10. Acid turns litmus paper:
A. Blue to red
B. Red to blue
C. No change
D. Green
Answer: A
Explanation: Acids turn blue litmus red.
👉 Quick Tip: Chemistry questions are fact-based.
🔹 Section 3: Biology
Q11. Smallest unit of life:
A. Atom
B. Molecule
C. Cell
D. Tissue
Answer: C
Explanation: Cell is the basic unit of life.
Q12. Human heart has:
A. 2 chambers
B. 3 chambers
C. 4 chambers
D. 5 chambers
Answer: C
Explanation: The human heart has 4 chambers.
Q13. Plants make food by:
A. Respiration
B. Photosynthesis
C. Digestion
D. Absorption
Answer: B
Explanation: Plants use sunlight to make food.
Q14. Blood is pumped by:
A. Brain
B. Lungs
C. Heart
D. Liver
Answer: C
Explanation: Heart pumps blood.
Q15. Vitamin C is found in:
A. Milk
B. Rice
C. Citrus fruits
D. Meat
Answer: C
Explanation: Citrus fruits contain Vitamin C.
👉 Exam Tip: Biology questions are easy and scoring.
🔹 Section 4: Mixed Questions
Q16. Unit of power:
A. Joule
B. Watt
C. Newton
D. Volt
Answer: B
Explanation: Power is measured in watts.
Q17. CO₂ is used by plants for:
A. Breathing
B. Photosynthesis
C. Digestion
D. Growth
Answer: B
Explanation: Plants use CO₂ to make food.
Q18. Boiling point of water:
A. 50°C
B. 75°C
C. 100°C
D. 120°C
Answer: C
Explanation: Water boils at 100°C.
Q19. Earth revolves around:
A. Moon
B. Sun
C. Mars
D. Jupiter
Answer: B
Explanation: Earth revolves around the Sun.
Q20. Which organ helps in breathing?
A. Heart
B. Brain
C. Lungs
D. Liver
Answer: C
Explanation: Lungs help in respiration.
🔑 Key Points Summary
- Physics = formulas & units
- Chemistry = reactions & elements
- Biology = human body & plants
- Practice MCQs daily
- Revise basics regularly
- Easy scoring section
📌 Conclusion
Science is one of the easiest and most scoring sections in competitive exams if you focus on basic concepts. Instead of memorizing, try to understand the logic behind each topic. Regular practice of MCQs and revision will help you retain information effectively. With consistent effort, you can score high marks in Physics, Chemistry, and Biology sections.
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