Question : Which physical theory explains the generation of thrust by rocket engines, jet engines and deflating balloons?
Option 1: Newton's laws of motion
Option 2: Exclusion principle
Option 3: Faraday's laws of electromagnetic induction
Option 4: Laws of thermodynamics
Correct Answer: Newton's laws of motion
Solution : The correct option is Newton's laws of motion.
Newton's Third Law of Motion explains thrust generation. For rockets, burning fuel accelerates gases downward, propelling the rocket upward. In jet engines, air is drawn in, compressed, mixed with fuel, and ignited, producing a backward expulsion of gases, propelling the jet forward. Similarly, deflating balloons push air backwards, causing forward motion, adhering to Newton's law of action and reaction.
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Question : The first law of thermodynamics is simply the case of:
Option 1: Charle's law
Option 2: Newton's law
Option 3: The law of heat exchange
Option 4: The law of conservation of energy
Question : Who gave the 'Law of Gravitation'?
Option 1: Michael Faraday
Option 2: Guglielmo Marconi
Option 3: James Watt
Option 4: Isaac Newton
Question : Who discovered 'Portland cement'?
Option 3: Joseph Aspdin
Question : The discovery and understanding of electromagnetic induction is based on a long series of experiments carried out by ______.
Option 1: Planck and Fermi
Option 2: Einstein
Option 3: Faraday and Henry
Option 4: Rutherford
Question : The magnitude of current flowing between two endpoints of a conductor is proportional to the potential difference between them and is called:
Option 1: Avogadro's law
Option 2: Rault's law
Option 3: Ohm's law
Option 4: Faraday's law
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