Q1) Which scientist is credited with the discovery of electromagnetic waves?

a) James Clerk Maxwell

b) Albert Einstein

c) Michael Faraday

d) Heinrich Hertz


Q2) Electromagnetic waves are composed of oscillating electric and magnetic fields that are:

a) Perpendicular to each other and to the direction of propagation

b) Parallel to each other and to the direction of propagation

c) Perpendicular to each other but parallel to the direction of propagation

d) Parallel to each other but perpendicular to the direction of propagation


Q3) What is the approximate speed of electromagnetic waves in a vacuum?

a) 300,000 m/s

b) 3,000,000 m/s

c) 30,000,000 m/s

d) 300,000,000 m/s


Q4) Which of the following types of electromagnetic waves has the longest wavelength?

a) Gamma rays

b) X-rays

c) Radio waves

d) Microwaves


Q5) Electromagnetic waves transfer energy through:

a) Oscillating electrons

b) Changes in temperature

c) Oscillating electric and magnetic fields

d) Vibrating atoms


Q6) The electromagnetic spectrum includes which of the following types of waves?

a) Visible light only

b) Radio waves only

c) X-rays only

d) All of the above


Q7) Which of the following electromagnetic waves has the highest frequency?

a) Infrared radiation

b) Ultraviolet radiation

c) Radio waves

d) Microwaves


Q8) What is the primary difference between ionizing and non-ionizing electromagnetic radiation?

a) Ionizing radiation has higher energy levels than non-ionizing radiation

b) Ionizing radiation can cause chemical changes in substances

c) Non-ionizing radiation cannot penetrate living tissues

d) Ionizing radiation is used in medical imaging


Q9) Which type of electromagnetic wave is commonly used for communication purposes?

a) Gamma rays

b) X-rays

c) Infrared radiation

d) Radio waves


Q10) The color of visible light with the longest wavelength is:

a) Red

b) Blue

c) Green

d) Violet


Q11) Electromagnetic waves with frequencies slightly higher than visible light are categorized as:

a) Ultraviolet radiation

b) Infrared radiation

c) Gamma rays

d) Radio waves


Q12) Which of the following statements about polarized light is true?

a) It has electric and magnetic fields that are perpendicular to each other

b) It consists of waves vibrating in multiple directions

c) Its electric field oscillates in a specific direction

d) It cannot be produced by natural sources


Q13) Which component of electromagnetic waves determines their color in the visible spectrum?

a) Wavelength

b) Amplitude

c) Frequency

d) Phase


Q14) Which of the following is NOT a property of electromagnetic waves?

a) They can travel through a vacuum

b) They are transverse waves

c) They require a medium for propagation

d) They can be reflected, refracted, and diffracted


Q15) Which type of electromagnetic wave has the highest energy?

a) Radio waves

b) Microwaves

c) X-rays

d) Infrared radiation


Q16) The ozone layer in the Earth's atmosphere primarily absorbs:

a) Radio waves

b) Microwaves

c) Ultraviolet radiation

d) Infrared radiation


Q17) What is the range of frequencies for microwaves?

a) 3 kHz to 300 GHz

b) 300 GHz to 3 THz

c) 30 Hz to 300 kHz

d) 3 THz to 30 PHz


Q18) Which type of electromagnetic wave is used in medical imaging to visualize bones and tissues?

a) Ultraviolet radiation

b) Gamma rays

c) X-rays

d) Infrared radiation


Q19) The phenomenon of light bending around corners is known as:

a) Reflection

b) Refraction

c) Diffraction

d) Polarization


Q20) Which of the following electromagnetic waves is often used in cooking and communication?

a) Gamma rays

b) Infrared radiation

c) Ultraviolet radiation

d) X-rays