Practice CSS questions with answers and explanations.
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Evaporation removes water as vapor.
The dissolved salt remains behind as crystals.
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Distillation boils water and then condenses the vapor.
Nonvolatile salts remain in the original container.
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Atoms are the basic chemical units of elements.
They contain protons, neutrons, and electrons.
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Protons carry positive electric charge.
They are located in the atomic nucleus.
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Electrons carry negative charge.
They occupy regions around the nucleus.
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Neutrons are electrically neutral.
They are found in atomic nuclei with protons.
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Sand particles are too large to pass through filter paper.
Water passes through as the filtrate.
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Bats emit high-frequency sound pulses and detect returning echoes.
This helps them navigate and locate prey.
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Electric current measures charge passing a point per unit time.
Its SI unit is the ampere.
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Electric current is measured in amperes.
An ampere equals one coulomb of charge per second.
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Voltage represents energy transferred per unit charge.
It drives current through a circuit.
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Resistance is measured in ohms.
It describes opposition to electric current.
