Quiz for Electromagnetic Waves

Q1: Which of the following has the highest frequency?

A. Radio waves B. Microwaves C. Ultraviolet D. Gamma rays

Q2: What is the speed of electromagnetic waves in vacuum?

A. 3 × 10^8 m/s B. 1.5 × 10^8 m/s C. 3 × 10^6 m/s D. None of the above

Q3: Which of the following is not a property of electromagnetic waves?

A. They are transverse waves B. They do not require a medium C. They carry energy D. They are longitudinal waves

Q4: Which electromagnetic wave has the longest wavelength?

A. Infrared B. Microwave C. Radio D. Gamma

Q5: Which of the following can be used for communication?

A. Gamma rays B. X-rays C. Radio waves D. Ultraviolet rays

Q6: Which wave is used in microwave ovens?

A. Infrared B. Microwave C. Radio D. Ultraviolet

Q7: What is the nature of EM waves?

A. Transverse only B. Longitudinal only C. Both transverse and longitudinal D. Scalar waves

Q8: The electric and magnetic fields in an EM wave are:

A. Parallel to each other B. Perpendicular to each other C. At 45° to each other D. Randomly aligned

Q9: The source of electromagnetic waves is:

A. Moving electric charges B. Stationary charges C. Neutrons D. None of these

Q10: Which of the following has the least penetrating power?

A. Gamma rays B. X-rays C. Microwaves D. Alpha particles

Q11: Which EM wave is used in night vision devices?

A. X-rays B. Infrared C. Gamma rays D. Ultraviolet

Q12: Which of these waves is most harmful to human tissue?

A. Infrared B. Visible C. Ultraviolet D. Microwave

Q13: EM waves can travel in:

A. Solids only B. Liquids only C. Vacuum only D. All of these

Q14: Which EM wave is emitted by the Sun in large quantity?

A. Ultraviolet B. Infrared C. Visible D. All of the above

Q15: The energy carried by EM wave is due to:

A. Electric field only B. Magnetic field only C. Both electric and magnetic fields D. None of the above

Q16: In an EM wave, the electric field oscillates:

A. Along propagation B. Perpendicular to propagation C. Circularly D. At 45° angle

Q17: Which EM wave is used in sterilization?

A. Microwave B. Ultraviolet C. X-ray D. Infrared

Q18: The unit of intensity of EM wave is:

A. Watt B. Watt/meter C. Watt/meter² D. Joule/meter²

Q19: In EM wave propagation, the Poynting vector represents:

A. Direction of electric field B. Direction of magnetic field C. Direction of energy propagation D. None

Q20: EM waves are produced by:

A. Static charges B. Accelerating charges C. Neutral particles D. Magnetic monopoles