IGCSE Physics Questions & Answers

IGCSE Physics Questions & Answers -273 - CORRECT ANSWER- what is absolute zero in degrees? -increase in frequency -decrease in wavelength - CORRECT ANSWER- as you go up the electromagnetic spectrum what increases/decreases? -speed -mass of the vehicle -quality of the breaks -road surface - CORRECT ANSWER- what factors affect braking distance? (2 x π x orbital radius) / time period - CORRECT ANSWER- how can you find orbital speed? 0 - CORRECT ANSWER- what is absolute zero in kelvins? 0 - CORRECT ANSWER- what is the voltage of a neutral wire? 365 - CORRECT ANSWER- how many days does it take for the earth to orbit the sun? a balance between the forward motion of the object and a force pulling it inwards - CORRECT ANSWER- what is an orbit? a diode - CORRECT ANSWER- what component is this for? a large collection of stars - CORRECT ANSWER- what is a galaxy? a quantity which has size - CORRECT ANSWER- what is a scalar quantity? a quantity which has size and direction - CORRECT ANSWER- what is a vector quantity? AC - CORRECT ANSWER- what type of current is in a mains supply? acceleration - CORRECT ANSWER- on a velocity-time graph what does the gradient symbolise? acceleration=change in velocity/time taken - CORRECT ANSWER- what is the equation relating acceleration, change in velocity and time taken? alternating current (current is always changing direction) - CORRECT ANSWER- what is AC? alternating voltage - CORRECT ANSWER- what type of voltage can a transformer change ammeter - CORRECT ANSWER- what is this symbol? amplitude and frequency always changes - CORRECT ANSWER- what is an analogue signal? an electric current - CORRECT ANSWER- what creates a magnetic field