Everyday Science MCQ (Multiple Choice Questions)

The correct answer is A) 1 g/cm3

The density of water is 1 gram per cubic centimeter (g/cm3). This means that if you have a cube of water with sides that are 1 centimeter long, the cube will have a mass of 1 gram. Water is a very dense substance, and its density is an important physical property that has many practical applications. For example, the density of water is used to calculate the buoyancy of objects in water, and it is also used to determine the concentration of dissolved substances in water.

The correct answer is b) 120 days.
Red blood cells, also known as erythrocytes, have a lifespan of about 120 days. They are produced in the bone marrow and released into the circulation to carry oxygen to the body’s tissues. When they become old or damaged, they are removed from circulation and replaced with new red blood cells.

The correct answer is B) Coulomb.

The SI unit of electric charge is the coulomb (C). This unit is defined as the amount of electric charge carried by a current of one ampere flowing for one second. The coulomb is a very large unit of electric charge, so it is commonly used in scientific work to measure smaller amounts of electric charge.

The other options are also related to electricity and electrical units.
A) The ampere (A) is the unit of electric current, which is defined as the flow of electric charge through a conductor.
C) The ohm (Ω) is the unit of electrical resistance, which is a measure of how difficult it is for electric current to flow through a conductor.
D) The volt (V) is the unit of electric potential difference, which is a measure of the energy needed to move a unit of electric charge between two points in a circuit.

The correct answer is B) Highly elliptical.

Comets are small celestial objects that orbit the Sun in highly elliptical paths. They are made up of a mixture of dust, ice, and other volatile materials, and they typically have a relatively small, solid nucleus surrounded by a coma, or cloud of gas and dust. As a comet approaches the Sun, the heat of the Sun causes the coma to expand, creating a bright, glowing halo around the nucleus. The tails of comets always point away from the Sun, and they are created by the solar wind pushing against the coma.

The correct answer is C) Global Positioning System.

GPS stands for Global Positioning System. It is a satellite navigation system that provides location and time information in all weather conditions, anywhere on or near the Earth’s surface. The system is operated by the United States government and is freely accessible to anyone with a GPS receiver. GPS is used for a wide range of applications, including tracking the location of vehicles, mapping, surveying, and navigation.

The correct answer is B) Loss of Electrons.

Oxidation is a chemical reaction in which a molecule or atom loses one or more electrons. This is usually accompanied by a gain in oxygen or a loss of hydrogen. The substance that is oxidized is called the reducing agent, while the substance that causes the oxidation is called the oxidizing agent. Oxidation reactions are important in many chemical processes, including the production of energy in cells, the rusting of iron, and the burning of fossil fuels.

The correct answer is D) Mercury.

The planet that moves around the Sun at the highest speed is Mercury. Mercury is the smallest planet in the solar system and is also the planet closest to the Sun. It orbits the Sun at a distance of about 36 million miles (58 million kilometers), which is about a third of the distance from the Earth to the Sun.

Because it is so close to the Sun, it takes only about 88 Earth days for Mercury to complete one orbit around the Sun. This is much shorter than the orbit periods of the other planets in the solar system, which range from about 1.9 years for Mars to about 11.9 years for Saturn. Mercury’s high speed is due to its close proximity to the Sun and its relatively small size, which allows it to be more easily accelerated by the Sun’s gravity.

The nearest planet to Earth is A) Venus.
Venus is the second planet from the Sun and is located closer to the Earth than any other planet in the solar system. It is about 67 million miles (108 million kilometers) away from the Earth at its closest point, which occurs about every 584 days when Venus and Earth are on opposite sides of the Sun.

Venus is often called the Earth’s sister planet because it is similar in size and composition to the Earth, and it is also the brightest object in the night sky after the Moon and Sun. However, Venus has a thick, toxic atmosphere and surface temperatures that reach up to 864 degrees Fahrenheit (462 degrees Celsius), so it is not habitable by humans.

The correct answer is A) Salt.

A common material used to melt ice on roads in cold countries is salt, specifically rock salt or sodium chloride. When salt is spread on ice, it can lower the freezing point of the water, causing it to melt. This can help to make roads safer to travel on during winter. Other materials that may be used to melt ice on roads include calcium chloride, magnesium chloride, and potassium chloride. Carbon dioxide and water are not typically used for this purpose.

The correct answer is A) plasma.

Plasma is the liquid component of blood that makes up about 55% of its total volume. It is a straw-colored, slightly viscous fluid that contains water, electrolytes, proteins, and other substances. The main function of plasma is to transport substances throughout the body, such as nutrients, hormones, enzymes, and waste products. It also helps to maintain the balance of fluid and electrolytes in the body, and plays a role in immune defense.

Plasma is made up of water, electrolytes (such as sodium, potassium, and calcium), glucose, and proteins (such as albumin, globulins, and fibrinogen). It does not contain cells or cell fragments, such as red blood cells, white blood cells, or platelets.