Everyday Science 2137 MCQs [All-Courses]

• It maintains electrical neutrality in both half-cells.
• It allows movement of ions to balance charge.
• It completes the internal circuit of the electrochemical cell.

• Being a weak base, ammonia helps in breaking down dirt, oils, and grease.
• It removes stains without damaging cloth fibers when used in dilute form.
• It also helps in eliminating bad odors from garments.

• Condensation is the process in which vapors (gas) are converted into liquid.
• It happens when gas cools down and loses heat energy.
• Example: water droplets forming on a cold glass.

• Aluminium is commonly used in containers, medicines, and cosmetics.
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• It is obtained from bauxite ore, which is its main source.
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• It is lightweight, durable, and resistant to corrosion.

• Hydrogen is the most abundant element in the universe.
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• It makes up about 75% of the universe's normal matter by mass.
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• Stars, including the Sun, are composed mainly of hydrogen.

• Chloroplast is a green cell organelle found in plant cells.
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• It contains chlorophyll pigment and is the site where photosynthesis takes place.
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• It helps plants make food using sunlight, water, and carbon dioxide.

A substance that acts as both an acid and a base is called an amphoteric substance.
Example: Water (H₂O) can act as both an acid and a base.

1. The main cause of biodiversity loss is habitat destruction.

2. Deforestation, pollution, and climate change also reduce biodiversity.

3. Human activities are the major reason behind the extinction of many species.

1. Fission is related to the process of splitting an atomic nucleus.

2. It occurs in nuclear reactions to release a large amount of energy.

3. Nuclear power plants use nuclear fission to produce electricity.