Physics GCSE Questions & Answers

Physics GCSE Questions & Answers Changes of State - CORRECT ANSWER- Boiling: occurs at a definite temperature called the boiling point. Bubbles/vapour form in the liquid and rise. Condensation: occurs when gas or vapour molecules return to liquid state. Melting: takes place at a definite temperature called the melting point. Energy is provided to break bonds between molecules. Solidification: occurs when molecules of a liquid returns to solid state. This takes place at freezing point. Circuit Symbols - CORRECT ANSWERElectric Current, Electromotive force and Potential Difference - CORRECT ANSWER- I= current Q= charge t= time I= Q/t -Electric current: Flow of charge measured in amps (must be connected in series) -Electromotive Force: source of electrical energy for a whole circuit, measured in volts -Potential difference: is a measure of electrical energy transferred in the component, measured in volts. Voltmeter must be connected in parallel with circuit elements. Electromagnetic Spectrum - CORRECT ANSWER- 1. They can all travel through a vacuum at the same high speed. 2. They show the normal wave properties of reflection 3. They are transverse waves 4. They travel due to moving electric and magnetic fields These rays include: Gamma rays, X-rays, Ultraviolet (UV) Electromagnetism - CORRECT ANSWER- -Wire or a coil carrying an electric current produces a magnetic field