Q1. Fructose caramelizes at __________.

1. 160°C
2. 110°C
3. 120°C
4. 180°C

ANSWER: B. 110°C

• Explanation – The type of sugar has an impact on the caramelization reaction. Sucrose and glucose caramelize at roughly 160 degrees Fahrenheit (320 degrees Fahrenheit), while fructose caramelizes at 110 degrees Fahrenheit (230F). The caramelization of fructose begins at 110°C, so fructose causes the fastest colour development. As a result, baked goods made with honey or fructose syrup will have a darker colour.

READ MORE – FOOD TECHNOLOGY (01-10-2021)

Q2. The process of caramelization starts with the melting of sugar followed by boiling which is also known as?

1. Foaming
2. Withering
3. Browning
4. None of the above

ANSWER: A. Foaming

• Explanation: Caramelization begins with the melting of sugar, which is followed by boiling, also known as foaming. A condensation reaction pulls water out of sugar later. The next stage involves isomerization and dehydration, which results in the formation of intermediates. Fragmentation produces brown flavor in the final stage of caramelization, while polymerization produces color.

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Q3. Atomic Absorption Spectrometry sensitivity is _____.

1. 1ug – 1ppm
2. 1ppm – 1ppb
3. 1g – 1mg
4. 1mg -1ug

ANSWER –  A.  1ug – 1ppm

• Explanation: The sensitivity of an atomic absorption spectrometer with a flame burner is commonly measured in parts per million, ranging from 1ug to 1ppm. A graphite furnace can be used instead of a flame burner to boost sensitivity by several orders of magnitude in trace analysis (in the parts per billion range). Environmental testing, metal analysis, semiconductor manufacturing, petroleum, and chemical production, and medicines are just a few of the industries that use atomic absorption spectrophotometer.

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Q4. Plasma can reach a temperature of about ______.

1. 100K
2. 10000K
3. 1000K
4. 1K

ANSWER:  B. 10000K

• Explanation: Plasmas can reach temperatures of up to 106eV (1eV 11600K) in nature, although maximum temperatures in industrial applications are around 1eV. Plasmas are thus a high-energy state, with temperatures determined by the energies of their species (neutral atoms, electrons, and ions) and highly influenced by the degree of ionization of the plasma in question. The electrons, neutral particles, and ions in these plasmas are all tempered differently. As a result, electrons can reach temperatures of 10000 K, whereas most gas particles cool down or remain at ambient temperature.

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Q5. Atomic absorption spectroscopy is also called as?

1. Raman spectroscopy
2. NMR spectroscopy
3. Absorption Flame Photometry
4. None of the above

ANSWER – C. Absorption Flame Photometry

• Explanation – The sample is sprayed into the flame in Atomic Absorption Spectroscopy. As a result, it’s known as Absorption Flame Photometry. The method employs a sample’s atomic absorption spectra to determine the concentration of various analytes inside it. It relies on the Beer-Lambert law to establish the relationship between the observed absorbance and the analyte concentration because it requires standards with known analyte content.

READ MORE – Food Science technology Quiz (31-10-2021)

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