Everyday Science

An echo is the reflection of sound waves from a surface back to the listener, which is why option A, Reflection, is correct.

In an oil lamp, the oil rises up the wick due to capillary action, which is the ability of a liquid to flow in narrow spaces without the assistance of external forces. This phenomenon allows the oil to move upward against gravity through the tiny pores in the wick.

Soft drinks are made with chilled water because cold water can dissolve and retain more carbon dioxide gas than water at room temperature, which helps maintain the drink's fizziness and taste.

The Moon is Earth's natural satellite, meaning it orbits Earth. It is not a star or a planet, so option D is correct.

Metrology is the scientific study of measurement, including its methods, units, and accuracy. The other options refer to different fields: Entomology is the study of insects, Ichthyology is the study of fish, and Ecology is the study of organisms and their environment.

Most of the ozone in Earth's atmosphere is concentrated in the stratosphere, forming the ozone layer which absorbs and scatters ultraviolet solar radiation.

Rain-proof coats and tents owe their waterproof properties primarily to the surface tension of water and the waterproof coatings or membranes applied to the materials. Surface tension causes water to bead up and not penetrate the fabric easily. Additionally, materials are treated with waterproof coatings (such as polyurethane or silicone) or use membranes like Gore-Tex that block water penetration while allowing breathability. This combination of surface tension effects and specialized coatings or membranes makes rain-proof coats and tents water-resistant or waterproof. Other options like viscosity, specific gravity, and elasticity do not contribute to waterproofing in this context.

The Earth's atmosphere is commonly divided into five main layers: the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. This classification is standard in atmospheric science.

The surface temperature of the Sun, also known as the photosphere temperature, is approximately 5,778 Kelvin, which is the widely accepted scientific value.

Dry ice is the solid form of carbon dioxide (CO2). It sublimates directly from solid to gas at atmospheric pressure without becoming liquid, making 'Solid Carbon Dioxide' the correct chemical name.