Units, Dimensions and Vectors — Flashcards
NIOS · Class 12 · Physics
39 flashcards for Units, Dimensions and Vectors (NIOS Class 12 Physics) to test yourself on key terms and facts.
Interactive on Super Tutor
Studying Units, Dimensions and Vectors? Get the full interactive chapter.
Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for flashcards and more.
Free trial, no card needed.
Learn better with visuals Super Tutor pairs illustrations like this with notes and quizzes for Units, Dimensions and Vectors.
State the seven base SI units with their symbols and the physical quantities they measure.
Answer
The seven base SI units are: 1. Length → metre (m) 2. Mass → kilogram (kg) 3. Time → second (s) 4. Electric Current → ampere (A) 5. Temperature → kelvin (K) 6. Luminous Intensity → candela (cd) 7. Amo…
A radio station broadcasts at 1370 kHz. Convert this frequency to GHz.
Answer
Given: Frequency = 1370 kHz Find: Frequency in GHz Step 1: Convert kHz to Hz 1370 kHz = 1370 × 10³ Hz = 1.370 × 10⁶ Hz Step 2: Convert Hz to GHz 1 GHz = 10⁹ Hz ∴ Frequency = 1.370 × 10⁶ / 10⁹ GHz =…
How many significant figures are in each of the following? (a) 426.69 (b) 4200304.002 (c) 0.3040 (d) 5000
Answer
(a) 426.69 → 5 significant figures Rule: All non-zero digits are significant. (b) 4200304.002 → 10 significant figures Rule: All zeros between non-zero digits are significant. (c) 0.3040 → 4 s…
A plate has length 3.003 m and width 2.26 m. Calculate its area correctly, respecting significant figures.
Answer
Given: Length = 3.003 m (4 sig. figs), Width = 2.26 m (3 sig. figs) Find: Area Step 1: Multiply Area = 3.003 × 2.26 = 6.78678 m² Step 2: Apply significant figures rule for multiplication Rule: Resul…
Why do we need standard units in science? What problem arises without them?
Answer
We need standard units because: 1. Universal Communication: Scientists worldwide must understand each other's measurements. If one uses 'tolas' and another uses 'grams', results cannot be compared.
What is the SI definition of one metre and one second?
Answer
One Metre: Defined as the distance travelled by light in vacuum in a time interval of 1/299,792,458 second. (Based on speed of light = 299,792,458 m/s exactly) One Second: Defined as the time require…
Write the dimensional formula for: (a) Velocity (b) Acceleration (c) Force (d) Work/Energy
Answer
Dimensional Formulas: (a) Velocity = Distance / Time → [LT⁻¹] (b) Acceleration = Velocity / Time = Distance / Time² → [LT⁻²] (c) Force = Mass × Acceleration → [M][LT⁻²] = [MLT⁻²] (d) Work = Force …
Check the dimensional correctness of: s = ut + ½at² where s = distance, u = initial velocity, a = acceleration, t = time
Answer
Method: Check if all terms on both sides have the same dimensions. LHS: s = distance → [L] RHS Term 1: ut = [LT⁻¹][T] = [L] ✓ RHS Term 2: ½at² Note: ½ has no dimensions = [LT⁻²][T²] = [L] ✓ Conclu…
+31 more flashcards
Practise AllFrequently Asked Questions
What are the important topics in Units, Dimensions and Vectors for NIOS Class 12 Physics?
How many flashcards are available for Units, Dimensions and Vectors?
How should I revise Units, Dimensions and Vectors for the NIOS Class 12 board exam?
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
More resources for Units, Dimensions and Vectors
Practice Quiz
Test yourself with a quick quiz
Important Questions
Exam-style questions with answers
Revision Notes
Key points for last-minute revision
Formula Sheet
The chapter's formulas in one place
Chapter Summary
Understand the chapter at a glance
Concept Maps
See how topics connect
Study Plan
Step-by-step plan for this chapter
Syllabus
What topics to cover
For serious students
Get the full Units, Dimensions and Vectors chapter — start free.
Quizzes, flashcards, an AI doubt solver and a study plan for NIOS Class 12 Physics. Free to start, no card needed.