WorksheetsElectromagnetic Radiation Quiz
Total questions: 20
Worksheet time: 10mins
What is the primary mechanism by which electromagnetic radiation transfers energy?
Convection
Conduction
Transverse magnetic and electric waves
Reflection
In physical therapy, which form of electromagnetic energy is commonly used?
X-rays
Infrared radiation
Gamma rays
Visible light
Which law states that the intensity of radiation varies with the cosine of the angle of incidence?
Arndt-Schultz Principle
Law of Grotthus-Draper
Cosine Law
Inverse Square Law
According to the Arndt-Schultz Principle, a reaction occurs in body tissues only when the energy absorbed is:
Sufficient to stimulate tissues
High enough to produce heat
Reflected back
Insufficient
What is the main reason for contraindicating electromagnetic radiation in patients with pacemakers?
Increased risk of infection
It can interfere with pacemaker function
It causes skin burns
It lowers blood pressure
The electromagnetic spectrum is divided into two main zones, which are:
Heat and Cold radiation
Mechanical and Electrical energy
Ionizing and Non-ionizing radiation
Shortwave and Microwave
Which type of infrared radiation penetrates the dermis and reaches up to 5 mm deep?
IRC
IRB
IRA
IRD
What physiological effect does heat have on collagen tissues?
Decreases elasticity
Increases extensibility
Causes muscle contraction
Reduces circulation
Infrared radiation mainly results in which kind of physiological effect?
Muscle contraction
Pain
Local vasodilatation
Tissue contraction
Which of the following is a non-luminous source of infrared radiation?
Luminous lamp
Tungsten filament lamp
Non-luminous lamp
Sunlight
The principle that no reaction occurs in tissues if the energy absorbed is insufficient is known as:
Cosine Law
Inverse Square Law
Law of Grotthus-Draper
Arndt-Schultz Principle
When electromagnetic energy passes from one medium to another and changes direction, this is known as:
Reflection
Absorption
Refraction
Conduction
What effect does increasing the distance between the heat source and the skin have on the intensity of radiation?
It increases the intensity
It decreases the intensity
It remains the same
It reflects back
Thermal agents in physical therapy are used to:
Cool down tissues
Relieve muscle spasm and pain
Increase blood clotting
Increase dehydration
Which type of physical agent energy modality is used in ultrasound therapy?
Electrical energy
Sound energy
Mechanical energy
Electromagnetic energy
The Inverse Square Law explains that intensity of radiation is inversely proportional to:
Distance squared from the source
Wavelength of radiation
Frequency of radiation
Temperature
Why is heat contraindicated in cases of acute inflammation?
It slows down cell function
It may increase inflammation
It prevents blood flow
It cools the area too quickly
Which of the following is a systemic effect of heat application?
Increased muscle spasm
Increased sweating
Reduced pulse rate
Reduced cell metabolism
The type of heat therapy that uses non-glowing sources, such as moist hot packs, is classified as:
Luminous IR
Non-luminous IR
Ultrasonic therapy
Microwave diathermy
Which of the following wavelengths is used in IRA (near-infrared) therapy?
3000 nm to 1 mm
760 nm to 1400 nm
400 nm to 700 nm
200 nm to 500 nm
