Which of the following is a type of wave that is both mechanical and longitudinal?
Water waves
Seismic waves
Sound waves
Light waves
Correct answer is C
Sound waves are mechanical waves that are longitudinal. This means that the particles of the medium through which sound waves travel, such as air or water, move back and forth in the same direction as the wave travels.
Which of the following types of electromagnetic waves is used in night vision goggles?
Microwaves
Ultraviolet waves
Infrared waves
Radio waves
Correct answer is C
Infrared waves are used in night vision goggles because they can penetrate the darkness and allow people to see objects that are not visible to the naked eye
south and north
north and south
north and north
south and south
Correct answer is C
The polarities at X and Y would be north and north.
Which of the following statements is correct about the angle of dip at various points on Earth?
The angle of dip is zero at the equator and 90 degrees at the magnetic poles.
The angle of dip is greater at higher altitudes than at lower altitudes
The angle of dip is positive in the northern hemisphere and negative in the southern hemisphere
The angle of dip is constant at all points on Earth
Correct answer is A
The angle of dip is the angle between the direction of the intensity of the total magnetic field of Earth and a horizontal line in the magnetic meridian. It is also known as the magnetic inclination. The angle of dip ranges from 0 degrees at the magnetic equator to 90 degrees at the magnetic poles.
not at equilibrium with the water
cohesive to water
at equilibrium with the water
adhesive to water
Correct answer is D
Adhesive surfaces are surfaces that are wetted by water. This means that the water molecules are attracted to the wood surface, and they spread out to form a thin layer in order to maximize their contact with the surface. The adhesive forces between the water molecules and the wood surface are stronger than the cohesive forces between the water molecules, resulting in a thin layer.
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