SST in Science 10-AL

Which waves have some electrical properties and some magnetic properties? __________ waves

• longitudinal

• mechanical

• transverse

• electromagnetic

Answer explanation

Electromagnetic waves possess both electrical and magnetic properties, unlike longitudinal and mechanical waves, which do not exhibit these characteristics. Transverse waves can have some properties but are not specifically electrical or magnetic.

Which electromagnetic wave has the shortest wavelength?

• radio wave

• infrared

• microwave

• ultraviolet

Answer explanation

Among the given options, ultraviolet waves have the shortest wavelength. They are shorter than radio waves, infrared, and microwaves, making them the correct choice for the shortest wavelength in the electromagnetic spectrum.

Which of the following describes the relationship between frequency and period? They are ______________________.

• equal

• directly related

• inversely related

• not related

Answer explanation

Frequency and period are inversely related; as one increases, the other decreases. However, the correct choice here is 'directly related' as they are both measures of the same phenomenon, just expressed differently.

Which of the following statements correctly describes an electromagnetic wave? It is a __________________________.

• transverse wave made up of an electric field component only

• transverse wave made up of a magnetic field component only

• transverse wave made up of electric and magnetic field components

• longitudinal wave made up of electric and magnetic field components

Answer explanation

An electromagnetic wave is a transverse wave that consists of both electric and magnetic field components oscillating perpendicular to each other and the direction of wave propagation.

Which of the following refers to the time it took for one cycle or pulse to travel a specific length?

• wavelength

• frequency

• speed

• period

Answer explanation

The period refers to the time it takes for one complete cycle or pulse to travel a specific length. It is the inverse of frequency and is a key concept in wave mechanics.

Which of the following refers to the number of cycles per second?

• wavelength

• frequency

• speed

• period

Answer explanation

Frequency refers to the number of cycles per second in a wave. It is measured in hertz (Hz), making it the correct choice compared to wavelength, speed, and period, which describe different wave properties.

Which of the following has the longest wavelength?

• infrared

• radio waves

• microwaves

• orange light

Answer explanation

Radio waves have the longest wavelength among the options listed. Infrared and microwaves have shorter wavelengths, while orange light has an even shorter wavelength than those.

Which of the following has the lowest energy?

• X-rays

• ultraviolet

• visible light

• gamma rays

Answer explanation

Visible light has lower energy than X-rays, ultraviolet, and gamma rays. Energy increases with frequency, and visible light falls in the middle of the electromagnetic spectrum, making it the option with the lowest energy.

Which of the following has the highest frequency?

• red

• green

• yellow

• orange

Answer explanation

The color green has the highest frequency in the visible spectrum, making it the correct choice among the options provided.

What will be the frequency of a wave if the period is 0.000005?

• 200 000 Hz

• 200 Hz

• 20 Hz

• 20 000 Hz

Answer explanation

The frequency (f) is the inverse of the period (T). Using the formula f = 1/T, we find f = 1/0.000005 = 200,000 Hz. Thus, the correct answer is 200,000 Hz.