EVERYDAY SCIENCE MCQ;S 01
Why is the sky blue?The sky is blue because of the reflection of the oceans.The sun emits blue light, which we see.Air molecules scatter the blue light from the sun more than other colors.The atmosphere absorbs all other colors except blue.C) Air molecules scatter the blue light from the sun more than other colors.This phenomenon is known as Rayleigh scattering. Sunlight is composed of all colors, but air molecules scatter the shorter wavelengths (blue and violet) more effectively than the longer wavelengths (red and orange), making the sky appear blue.
What is the main cause of the tides in the oceans?Earth's rotationWind patternsThe gravitational pull of the moon and the sun. Changes in atmospheric pressure.C) The gravitational pull of the moon and the sun.The gravitational pull of the moon and, to a lesser extent, the sun creates bulges in the ocean, which we observe as high and low tides as the Earth rotates.
: Why do objects fall to the ground when dropped? Centrifugal forceThe Earth's magnetic fieldThe Earth's gravitational forceThe wind pushing them down C) The Earth's gravitational forceThe force of gravity pulls all objects with mass toward each other. The Earth's gravity is strong enough to pull any object on or near its surface toward its center.
What is the chemical that gives blood its red color?PlasmaHemoglobin PlateletsWhite blood cellsB) HemoglobinHemoglobin is a protein in red blood cells that contains iron and is responsible for transporting oxygen. The iron-rich structure is what gives blood its red color.
What is the role of a fuse in an electrical circuit?To increase the voltage.To decrease the current.To protect the circuit from excessive current.To store electrical energy.C) To protect the circuit from excessive current. A fuse is a safety device that contains a wire designed to melt and break the circuit if the current flowing through it exceeds a safe level, thus protecting the connected appliances.