NEET Smart Learning Structure | Mnemonics, Tables & Tricks for Physics & Chemistry

 - Dr.Sanjaykumar Pawar  

Best NEET Study Notes Format with Memory Tricks, Tables & Shortcuts 

Smart NEET Learning Structure with Mnemonics, Formula Tables, and Revision Strategy for Faster Exam Preparation

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✔️/CBSE class 11 physics unit and dimensions NCERT solutions

CBSE Class 9 Science

Fill in the Blanks (Solved Step by Step)

Question:
(a) The volume of a cube of side 1 cm is equal to ______ m³.

Given:
Side = 1 cm = 0.01 m

Volume of Cube = (Side)³

Volume = (0.01)³

= 0.000001 m³

= 1 × 10^-6 m³

Answer: 1 × 10^-6 m³

Question:
(b) The surface area of a solid cylinder of radius 2.0 cm and height 10.0 cm is equal to ______ (mm)².

Given:

• Radius = 2 cm
• Height = 10 cm

Total Surface Area = 2πr(r+h)

= 2 × (22/7) × 2 × (2 + 10)

= 150.86 cm²

1 cm² = 100 mm²

150.86 × 100

= 15086 mm²

Answer: 15086 mm²

Question:
(c) A vehicle moving with a speed of 18 km h^-1 covers ______ m in 1 s.

Convert speed into m/s.

18 × 5/18 = 5 m/s

Distance = Speed × Time

= 5 × 1

= 5 m

Answer: 5 m

Question:
(d) The relative density of lead is 11.3. Its density is ______ g cm^-3 or ______ kg m^-3.

Relative Density = 11.3

Density of Water = 1 g/cm³

Density of Lead

= 11.3 × 1

= 11.3 g/cm³

1 g/cm³ = 1000 kg/m³

11.3 × 1000

= 11300 kg/m³

Answer: 11.3 g/cm³ or 11300 kg/m³

Short Notes

1. Volume of a Cube

• Volume is the space occupied by a body.
• Formula: Volume = Side³
• SI Unit = m³
• 1 cm³ = 10^-6 m³

2. Surface Area of a Cylinder

• Total Surface Area = 2πr(r+h)
• SI Unit = m²
• 1 cm² = 100 mm²

3. Speed and Distance

• Speed = Distance / Time
• Distance = Speed × Time
• 1 km/h = 5/18 m/s

4. Density

• Density = Mass / Volume
• SI Unit = kg/m³
• CGS Unit = g/cm³

5. Relative Density

• Relative Density = Density of Substance / Density of Water
• It has no unit.
• Density (g/cm³) = Relative Density × 1

Important Conversions

• 1 cm = 10^-2 m
• 1 cm³ = 10^-6 m³
• 1 cm² = 100 mm²
• 1 g/cm³ = 1000 kg/m³
• 1 km/h = 5/18 m/s

NEET Practice Questions

Units, Measurements & Density

Q1. The volume of a cube having side 2 cm is
A. 2 × 10⁻⁶ m³
B. 4 × 10⁻⁶ m³
C. 8 × 10⁻⁶ m³
D. 16 × 10⁻⁶ m³

Answer: C

Volume = 2³ = 8 cm³ = 8 × 10⁻⁶ m³

Q2. A vehicle moves with speed 72 km/h. Its speed in m/s is

Answer: C (20 m/s)

72 × 5/18 = 20 m/s

Q3. The SI unit of density is
A. g/cm³
B. kg/m³
C. kg/cm³
D. g/m³

Answer: B

Q4. Relative density has

Answer: C (No unit)

Q5. 1 g/cm³ is equal to
A. 10 kg/m³
B. 100 kg/m³
C. 1000 kg/m³
D. 10000 kg/m³

Answer: C

Q6. Total surface area of a cylinder is
A. 2πrh
B. πr²h
C. 2πr(r+h)
D. π(r+h)

Answer: C

Q7. Density of water is

Answer: B (1 g/cm³)

Q8. Relative density of a substance is 13.6, its density is

Answer: B (13.6 g/cm³)

Q9. Convert 5000 kg/m³ into g/cm³

Answer: B (5 g/cm³)

1000 kg/m³ = 1 g/cm³ → 5000 = 5 g/cm³

Q10. Dimensional formula of density is
A. MLT⁻²
B. ML⁻³
C. MLT
D. ML²

Answer: B

Assertion Reason

Q11. Assertion: Relative density has no unit.
Reason: It is ratio of two densities.

Answer: A

Q12. Assertion: Density depends on mass and volume.
Reason: Density = Mass/Volume

Answer: A

Integer Type

Q13. Cube side = 5 cm, volume?

Answer: 125 cm³

Q14. Convert 36 km/h into m/s

Answer: 10 m/s

Q15. 11300 kg/m³ in g/cm³

Answer: 11.3 g/cm³

Tricky Questions

Q16. Which has no dimensions?

Answer: C (Relative density)

Q17. If cube side is doubled, volume becomes?

Answer: D (8 times)

Q18. If radius and height doubled, TSA becomes?

Answer: B (4 times)

Quick Revision

Density = M/V
Relative density = No unit
1 cm³ = 10⁻⁶ m³
1 g/cm³ = 1000 kg/m³
18 km/h = 5 m/s
Cylinder TSA = 2πr(r+h)

NEET Smart Learning Structure

1. Topic Name

Units and Measurements

2. One-Line Definition

✔ Volume = किसी वस्तु द्वारा घेरा गया स्थान
✔ Density = प्रति इकाई आयतन में द्रव्यमान
✔ Relative Density = पदार्थ की घनत्व / पानी की घनत्व

3. Formula Table

Quantity	Formula	SI Unit	Conversion
Volume	Side³	m³	1 cm³ = 10⁻⁶ m³
Density	Mass/Volume	kg/m³	1 g/cm³ = 1000 kg/m³
Speed	Distance/Time	m/s	1 km/h = 5/18 m/s
Cylinder TSA	2πr(r+h)	m²	1 cm² = 100 mm²

4. Memory Table

1 cm = 10⁻² m → Centi = -2
1 cm² = 100 mm² → Square rule
1 cm³ = 10⁻⁶ m³ → Cube rule
1 g/cm³ = 1000 kg/m³ → Thousand rule
18 km/h = 5 m/s → Shortcut trick

5. Mnemonics

Density: M/V (Mass over Volume)

Speed Triangle:
D
---
S T

Cube Conversion: 2-4-6 Rule

6. NEET Trap Points

❌ Relative Density has no unit
❌ Area → square conversion always
❌ Volume → cube conversion always
❌ 18 km/h = 5 m/s important trick

7. Exam Strategy Flow

Unit → Formula → Conversion → Calculation → Option Match

8. Flash Cards

Q: Density Formula?
A: Mass/Volume

Q: Relative Density Unit?
A: No Unit

Q: 1 cm³?
A: 10⁻⁶ m³

Q: 18 km/h?
A: 5 m/s

9. Mind Map

Units
├── Length
├── Area
├── Volume
├── Density
├── Relative Density
├── Speed
└── Conversion

↓
Formulas
↓
Memory Tricks
↓
PYQs
↓
NEET Ready