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Question 1:

What is an analytical balance used for?

A) Measuring volume
B) Weighing small quantities of substances with high precision
C) Analyzing the chemical composition of samples
D) Controlling temperature and humidity in a laboratory

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Explanation: The correct answer is B) Weighing small quantities of substances with high precision. Analytical balances are designed for measuring the mass of substances with very high precision. They are commonly used in laboratories for tasks such as preparing precise chemical mixtures, measuring reagents, or conducting analytical experiments.

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Question 2:

Which of the following is a characteristic feature of an analytical balance?

A) High readability
B) Large weighing capacity
C) Fast measurement speed
D) Automatic sample analysis

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Explanation: The correct answer is A) High readability. One of the characteristic features of an analytical balance is its high readability or precision. Analytical balances are capable of measuring weights with a high degree of precision, often up to four or more decimal places, allowing for accurate measurements of small quantities of substances.

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Question 3:

What is the purpose of the draft shield in an analytical balance?

A) To protect the balance from dust and drafts
B) To provide stability to the balance
C) To minimize air currents around the weighing pan
D) To increase the weighing capacity of the balance

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Explanation: The correct answer is C) To minimize air currents around the weighing pan. The draft shield in an analytical balance is designed to minimize the effects of air currents on the weighing process. It creates a controlled environment around the weighing pan, reducing the influence of drafts, temperature variations, and air movements that could affect the accuracy of the measurement.

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Question 4:

Which unit of measurement is commonly used by analytical balances?

A) Milliliters (ml)
B) Kilograms (kg)
C) Pounds (lb)
D) Grams (g)

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Explanation: The correct answer is D) Grams (g). Analytical balances commonly measure weight in grams (g). The high precision and readability of these balances allow for accurate measurement of small masses in grams or fractions of a gram, which is typically the desired unit of measurement in laboratory settings.

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Question 5:

What is the recommended practice when using an analytical balance?

A) Use gloved hands for handling samples
B) Place the sample directly on the weighing pan
C) Zero the balance before and after each measurement
D) Keep the balance exposed to ambient conditions

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Explanation: The correct answer is C) Zero the balance before and after each measurement. It is recommended to zero the analytical balance before and after each measurement to account for any variations or drift in the balance's readings. Zeroing ensures that the balance is calibrated to consider only the weight of the sample being measured, leading to more accurate results.