Units and Measurements
Uttar Pradesh Board · Class 11 · Physics
Flashcards for Units and Measurements — Uttar Pradesh Board Class 11 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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What is a unit in physics? Why do we need units for measurements?
Answer
A unit is a basic, arbitrarily chosen, internationally accepted reference standard used for comparison when measuring any physical quantity. We need units because: 1. To express the result of measurem…
Distinguish between fundamental units and derived units with examples.
Answer
**Fundamental Units:** - Units for base quantities that cannot be expressed in terms of other units - Examples: meter (m) for length, kilogram (kg) for mass, second (s) for time **Derived Units:** - …
List the seven SI base units with their symbols and quantities.
Answer
The seven SI base units are: 1. **Length** - meter (m) 2. **Mass** - kilogram (kg) 3. **Time** - second (s) 4. **Electric Current** - ampere (A) 5. **Thermodynamic Temperature** - kelvin (K) 6. **Amo…
What are the units for plane angle and solid angle? Are they considered base units?
Answer
**Plane Angle:** radian (rad) - Defined as ratio of arc length to radius: θ = s/r **Solid Angle:** steradian (sr) - Defined as ratio of area on sphere to square of radius: Ω = A/r² **Not base units…
Why was SI system adopted? What are its advantages over older systems like CGS and FPS?
Answer
**SI System Advantages:** 1. **Universal acceptance** - Used internationally in science, technology, and commerce 2. **Decimal system** - Easy conversions using powers of 10 3. **Coherent system** - D…
What are significant figures? How do you determine the number of significant figures in 0.00308?
Answer
**Significant Figures:** All digits in a measured value that are known reliably plus the first uncertain digit. **For 0.00308:** Number of significant figures = **3** **Analysis:** - Leading zeros (…
State the rules for determining significant figures in the following numbers: 1200, 1200., 1.200 × 10³
Answer
**1200:** 2 significant figures - Trailing zeros without decimal are NOT significant - Only 1 and 2 are significant **1200.:** 4 significant figures - Decimal point makes trailing zeros significant…
Apply significant figure rules: Calculate (4.237 g) ÷ (2.51 cm³) and express the answer correctly.
Answer
**Given:** - Mass = 4.237 g (4 significant figures) - Volume = 2.51 cm³ (3 significant figures) **Calculation:** Density = 4.237 ÷ 2.51 = 1.68804... g/cm³ **Rule for multiplication/division:** Resul…
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