Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
Electric motor primarily converts?
electrical energy to chemical energy.
kinetic energy to potential energy
electrical energy to mechanical energy
electrical energy to heat energy.
Correct answer is C
An electric motor is an electrical machine that converts electrical energy into mechanical energy
A heat sensitive resistor made of a semiconductor is called?
thermometer
thermostat
thermistor
thermopile
Correct answer is C
Thermistors act as a passive component in a circuit. They are an accurate, cheap, and robust way to measure temperature.
Opening in the eye through which light passes to the retina is called the?
pupil
cornea
iris
optic nerve
Correct answer is A
The function of the pupil is clearly that of controlling the amount of light entering the eye, and hence the light reflex
Which of the following factors does not affect the rate of evaporation of a liquid?
temperature
volume
wind
surface area
Correct answer is B
The rate of evaporation depends on temperature, presence of wind, the humidity of the surrounding, and the surface area of the liquid exposed to the atmosphere. It doesn't depend on the mass of the liquid. The larger the surface area, the more would be the rate of evaporation.
Formation of hydrogen bubbles at the copper plate of a primary cell is called?
polarization
back e.m.f.
electrolysis
local action.
Correct answer is A
Polarization:The hydrogen bubbles which are clinging over the surface of copper electrode anode becomes a thin film of hydrogen over the copper electrode.
This hydrogen film increases the internal resistance and reduces the emf of the cell and hence the cell soon becomes inactive. This effect is known as polarization