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Q. What is the band gap energy of silicon at room temperature?
-
A.
0.1 eV
-
B.
1.1 eV
-
C.
2.0 eV
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D.
3.5 eV
Solution
The band gap energy of silicon at room temperature is approximately 1.1 eV.
Correct Answer: B — 1.1 eV
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Q. What is the bandwidth of a signal that has a frequency range from 300 Hz to 3 kHz?
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A.
2.7 kHz
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B.
3.3 kHz
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C.
2.4 kHz
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D.
3.0 kHz
Solution
Bandwidth = f_max - f_min = 3000 Hz - 300 Hz = 2700 Hz or 2.7 kHz.
Correct Answer: A — 2.7 kHz
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Q. What is the bandwidth of a signal that occupies a frequency range from 1 kHz to 3 kHz?
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A.
1 kHz
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B.
2 kHz
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C.
3 kHz
-
D.
4 kHz
Solution
Bandwidth = f_max - f_min = 3 kHz - 1 kHz = 2 kHz.
Correct Answer: B — 2 kHz
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Q. What is the bandwidth of a signal that occupies a frequency range from 300 Hz to 3 kHz?
-
A.
2.7 kHz
-
B.
3.3 kHz
-
C.
2.4 kHz
-
D.
3.0 kHz
Solution
Bandwidth = f_max - f_min = 3000 Hz - 300 Hz = 2700 Hz = 2.7 kHz.
Correct Answer: A — 2.7 kHz
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Q. What is the basic building block of proteins?
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A.
Nucleotides
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B.
Fatty acids
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C.
Amino acids
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D.
Monosaccharides
Solution
Proteins are made up of amino acids, which are their basic building blocks.
Correct Answer: C — Amino acids
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Q. What is the basic structural unit of proteins?
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A.
Nucleotide
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B.
Monosaccharide
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C.
Amino acid
-
D.
Fatty acid
Solution
Proteins are made up of long chains of amino acids.
Correct Answer: C — Amino acid
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Q. What is the basic unit of nucleic acids?
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A.
Amino acid
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B.
Nucleotide
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C.
Monosaccharide
-
D.
Fatty acid
Solution
The basic unit of nucleic acids, such as DNA and RNA, is the nucleotide.
Correct Answer: B — Nucleotide
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Q. What is the basic unit of proteins?
-
A.
Nucleotide
-
B.
Monosaccharide
-
C.
Amino acid
-
D.
Fatty acid
Solution
Proteins are made up of amino acids, which are their basic building blocks.
Correct Answer: C — Amino acid
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Q. What is the binding energy of a nucleus?
-
A.
Energy required to remove a nucleon
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B.
Energy released during nuclear fusion
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C.
Energy required to split the nucleus
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D.
Energy required to form the nucleus from its constituents
Solution
The binding energy of a nucleus is the energy required to form the nucleus from its constituent protons and neutrons.
Correct Answer: D — Energy required to form the nucleus from its constituents
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Q. What is the binding energy per nucleon for a stable nucleus?
-
A.
Less than 1 MeV
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B.
About 8 MeV
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C.
More than 10 MeV
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D.
Zero
Solution
Stable nuclei typically have a binding energy per nucleon around 8 MeV.
Correct Answer: B — About 8 MeV
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Q. What is the boiling point elevation of a solution containing 1 mol of NaCl in 1 kg of water? (K_b for water = 0.512 °C kg/mol)
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A.
0.512 °C
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B.
1.024 °C
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C.
1.536 °C
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D.
2.048 °C
Solution
Boiling point elevation = i * K_b * m = 2 * 0.512 * 1 = 1.024 °C (i = 2 for NaCl)
Correct Answer: B — 1.024 °C
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Q. What is the boiling point of a liquid?
-
A.
The temperature at which vapor pressure equals atmospheric pressure
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B.
The temperature at which a liquid freezes
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C.
The temperature at which a liquid evaporates
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D.
The temperature at which a liquid condenses
Solution
The boiling point is defined as the temperature at which the vapor pressure of a liquid equals the atmospheric pressure.
Correct Answer: A — The temperature at which vapor pressure equals atmospheric pressure
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Q. What is the boiling point of a solution containing 0.5 mol of KCl in 1 kg of water? (K_b for water = 0.512 °C kg/mol)
-
A.
1.024 °C
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B.
0.512 °C
-
C.
1.536 °C
-
D.
2.048 °C
Solution
Boiling point elevation = i * K_b * m = 2 * 0.512 * 0.5 = 0.512 °C; Boiling point = 100 + 0.512 = 100.512 °C
Correct Answer: C — 1.536 °C
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Q. What is the boiling point trend among alcohols, ethers, and alkanes?
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A.
Alcohols > Ethers > Alkanes
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B.
Ethers > Alcohols > Alkanes
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C.
Alkanes > Ethers > Alcohols
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D.
All have the same boiling point
Solution
Alcohols have higher boiling points than ethers and alkanes due to hydrogen bonding.
Correct Answer: A — Alcohols > Ethers > Alkanes
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Q. What is the bond angle around the carbon atoms in an alkyne?
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A.
120 degrees
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B.
180 degrees
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C.
109.5 degrees
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D.
90 degrees
Solution
The bond angle around the carbon atoms in an alkyne is approximately 180 degrees due to linear geometry.
Correct Answer: B — 180 degrees
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Q. What is the bond angle in a methane (CH4) molecule?
-
A.
90 degrees
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B.
109.5 degrees
-
C.
120 degrees
-
D.
180 degrees
Solution
In methane, the bond angle is approximately 109.5 degrees due to its tetrahedral geometry.
Correct Answer: B — 109.5 degrees
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Q. What is the bond angle in a tetrahedral molecule?
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A.
90 degrees
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B.
120 degrees
-
C.
109.5 degrees
-
D.
180 degrees
Solution
In a tetrahedral geometry, the bond angles are approximately 109.5 degrees.
Correct Answer: C — 109.5 degrees
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Q. What is the bond angle in a trigonal planar molecule?
-
A.
120 degrees
-
B.
109.5 degrees
-
C.
180 degrees
-
D.
90 degrees
Solution
In a trigonal planar geometry, the bond angles are 120 degrees.
Correct Answer: A — 120 degrees
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Q. What is the bond angle in a water molecule (H2O) according to VSEPR theory?
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A.
120 degrees
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B.
109.5 degrees
-
C.
104.5 degrees
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D.
90 degrees
Solution
The bond angle in H2O is approximately 104.5 degrees due to the two lone pairs on oxygen.
Correct Answer: C — 104.5 degrees
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Q. What is the bond angle in a water molecule (H2O)?
-
A.
120 degrees
-
B.
109.5 degrees
-
C.
104.5 degrees
-
D.
180 degrees
Solution
The bond angle in H2O is approximately 104.5 degrees due to the two lone pairs on oxygen.
Correct Answer: C — 104.5 degrees
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Q. What is the bond angle in water (H2O)?
-
A.
90 degrees
-
B.
104.5 degrees
-
C.
120 degrees
-
D.
180 degrees
Solution
The bond angle in water (H2O) is approximately 104.5 degrees.
Correct Answer: B — 104.5 degrees
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Q. What is the bond order of the CO molecule?
Solution
CO has a bond order of 3, calculated as (10 bonding - 3 antibonding)/2.
Correct Answer: C — 3
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Q. What is the bond order of the ion O2-?
Solution
O2- has a bond order of 1, calculated as (10 bonding electrons - 7 antibonding electrons)/2 = 1.
Correct Answer: B — 2
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Q. What is the bond order of the molecule B2 according to molecular orbital theory?
Solution
B2 has a bond order of 1, calculated as (2 bonding - 0 antibonding)/2.
Correct Answer: B — 1
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Q. What is the bond order of the molecule B2?
Solution
B2 has a bond order of 1, calculated from its molecular orbital configuration.
Correct Answer: A — 1
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Q. What is the bond order of the molecule CO?
Solution
CO has a bond order of 3, calculated as (10 bonding electrons - 2 antibonding electrons)/2 = 3.
Correct Answer: C — 3
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Q. What is the bond order of the molecule He2?
Solution
He2 has a bond order of 0, as it has no net bonding electrons.
Correct Answer: A — 0
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Q. What is the bond order of the N2 molecule?
Solution
N2 has a bond order of 3, calculated as (10 bonding - 0 antibonding)/2 = 3.
Correct Answer: C — 3
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Q. What is the bond order of the O2 molecule according to Molecular Orbital Theory?
Solution
O2 has 12 total electrons, leading to a bond order of (10 bonding - 6 antibonding)/2 = 1.
Correct Answer: B — 2
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Q. What is the Brewster's angle for a medium with a refractive index of 1.5?
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A.
30 degrees
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B.
45 degrees
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C.
60 degrees
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D.
53 degrees
Solution
Brewster's angle can be calculated using the formula tan(θ_B) = n, where n is the refractive index. For n = 1.5, θ_B = arctan(1.5) ≈ 53 degrees.
Correct Answer: D — 53 degrees
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