NEET Physics · Flashcards
This deck has 15 flashcards on Units and Measurements for NEET Physics, from NCERT Class 11.
A high-yield conceptual flashcard deck for NEET Physics mastering Units, Dimensions, Error Analysis, and Measuring Instruments through targeted questions and visual aids.
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Card 1 of 15
What are the 7 SI Base Quantities and their units?
Hint: Think: LMTE-TAL
Answer
Length (meter), Mass (kilogram), Time (second), Electric Current (ampere), Thermodynamic Temperature (kelvin), Amount of Substance (mole), Luminous Intensity (candela).
Card 2 of 15
Differentiate between Plane Angle and Solid Angle (Supplementary Units).
Hint: θ = arc/radius; Ω = Area / radius²
Answer
Plane Angle: θ = ds/r (radians) Solid Angle: Ω = dA/r² (steradians)
Card 3 of 15
Explain the Parallax Method formula for measuring large distances.
Hint: Ensure θ is strictly in radians, not degrees!
Answer
Distance (D) = Basis (b) / Parallax Angle (θ)
Card 4 of 15
What are the dimensional formulas for Force and Work/Energy?
Hint: Work = Force × Displacement. These are the two most important dimensions to memorize.
Answer
Force = [M¹ L¹ T⁻²] Work/Energy = [M¹ L² T⁻²]
Card 5 of 15
Derive the dimensional formula for the Universal Gravitational Constant (G).
Hint: A highly repeated question in NEET.
Answer
F = G(m₁m₂)/r², G = Fr²/(m₁m₂) Dimensions: [MLT⁻²][L²]/[M²] = [M⁻¹L³T⁻²].
Card 6 of 15
What is the dimensional formula for Planck's Constant (h), and which physical quantity shares it?
Hint: E = hν (Energy = h × frequency). Frequency is [T⁻¹].
Answer
Planck's Constant (h) = [M¹ L² T⁻¹]. It has the same dimensions as Angular Momentum (L = mvr).
Card 7 of 15
State the Principle of Homogeneity of Dimensions.
Hint: In equation v = u + at, the dimensions of 'v', 'u', and 'at' must all be identical.
Answer
Only physical quantities with the same dimensions can be added, subtracted, or equated.
Card 8 of 15
What are the rules for identifying Significant Figures regarding zeroes?
Hint: Zeroes between non-zero digits are always significant (e.g., 1005 has 4).
Answer
1. Trailing zeroes in a number WITHOUT a decimal are NOT significant (e.g., 1500 has 2). 2. Trailing zeroes WITH a decimal ARE significant (e.g., 15.00 has 4). 3. Leading zeroes are NEVER significant (e.g., 0.005 has 1).
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