Physical World — Flashcards
ICSE · Class 11 · Physics
40 flashcards for Physical World (ICSE Class 11 Physics) to test yourself on key terms and facts. Sample: "State the meaning of Physics and Science."
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State the meaning of Physics and Science.
Answer
Physics comes from the Greek word 'fusis' meaning 'nature'. Science comes from the Latin word 'Scientia' meaning 'to know'. Physics studies nature and natural phenomena.
What are the four steps of the scientific method?
Answer
1. Observation of facts. 2. Proposing a theory or hypothesis. 3. Testing the validity of the predictions. 4. Modification of the theory if necessary. This method helps science grow and improve with ne…
Why can complex physical phenomena be understood despite their wide range?
Answer
Three main reasons explain this: 1. Regularity and symmetry exist even in complex phenomena. 2. Many different phenomena can be explained using a few basic laws. 3. Important features can be separated…
What is the range of length in physical processes?
Answer
Length in physical processes ranges from 10^-15 m, the size of the nucleus, to 10^26 m, the size of the universe.
What is the range of mass in physical processes?
Answer
Mass ranges from 10^-30 kg, the mass of an electron, to 10^30 kg, the mass of the sun.
What is the range of time interval in physical processes?
Answer
Time-interval ranges from 10^-23 s, the time taken by light to cross a nuclear distance, to 10^18 s, the life of the sun.
State the branches of Physics.
Answer
Mechanics, Waves and Oscillations, Heat and Thermodynamics, Properties of Matter including Fluid Mechanics, Electrodynamics, Optics and Relativity, Atomic Physics, Nuclear Physics, Electronics and Com…
How is conservation of energy linked with time symmetry?
Answer
The laws of nature do not change with time. This symmetry of nature with respect to time is equivalent to the law of conservation of energy.
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