Q. What is the trend in atomic radius as you move down the alkali metal group? (2022)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Increases then decreases
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Solution
The atomic radius increases as you move down the alkali metal group due to the addition of electron shells.
Correct Answer: A — Increases
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Q. What is the trend in reactivity of alkali metals down the group? (2022)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Varies irregularly
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Solution
The reactivity of alkali metals increases down the group due to the decrease in ionization energy.
Correct Answer: A — Increases
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Q. What is the typical current-voltage characteristic of a diode in reverse bias? (2019)
A.
Linear
B.
Exponential
C.
Constant
D.
Very small reverse saturation current
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Solution
In reverse bias, a diode exhibits a very small reverse saturation current until breakdown occurs.
Correct Answer: D — Very small reverse saturation current
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Q. What is the typical forward voltage drop across a silicon diode? (2023)
A.
0.2 V
B.
0.7 V
C.
1.5 V
D.
2.0 V
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Solution
The typical forward voltage drop across a silicon diode is approximately 0.7 V.
Correct Answer: B — 0.7 V
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Q. What is the unit cell of a diamond structure? (2022)
A.
Face-centered cubic
B.
Body-centered cubic
C.
Simple cubic
D.
Hexagonal
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Solution
The diamond structure is based on a face-centered cubic (FCC) unit cell with a specific arrangement of carbon atoms.
Correct Answer: A — Face-centered cubic
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Q. What is the unit cell of diamond classified as? (2022)
A.
Simple cubic
B.
Face-centered cubic
C.
Body-centered cubic
D.
Cubic close-packed
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Solution
The diamond structure is classified as a face-centered cubic (FCC) lattice with a basis of two carbon atoms.
Correct Answer: B — Face-centered cubic
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Q. What is the unit cell of diamond? (2022)
A.
Face-centered cubic
B.
Body-centered cubic
C.
Simple cubic
D.
Hexagonal
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Solution
Diamond has a face-centered cubic (FCC) structure with a complex arrangement of carbon atoms.
Correct Answer: A — Face-centered cubic
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Q. What is the unit of energy in the SI system? (2023)
A.
Joule
B.
Watt
C.
Newton
D.
Pascal
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Solution
The SI unit of energy is the Joule (J).
Correct Answer: A — Joule
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Q. What is the unit of inductive reactance? (2020)
A.
Ohm
B.
Henry
C.
Farad
D.
Tesla
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Solution
Inductive reactance (X_L) is measured in Ohms (Ω), which is the same unit used for resistance.
Correct Answer: A — Ohm
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Q. What is the unit of magnetic moment? (2023)
A.
Ampere-meter
B.
Tesla
C.
Weber
D.
Newton-meter
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Solution
The unit of magnetic moment is Ampere-meter (A·m²).
Correct Answer: A — Ampere-meter
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Q. What is the unit of measurement for electric current in the SI system? (2022)
A.
Volt
B.
Ampere
C.
Ohm
D.
Coulomb
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Solution
The SI unit of electric current is the Ampere (A).
Correct Answer: B — Ampere
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Q. What is the unit of measurement for electric current? (2019)
A.
Volt
B.
Ohm
C.
Ampere
D.
Watt
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Solution
The SI unit of electric current is the Ampere (A).
Correct Answer: C — Ampere
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Q. What is the unit of pressure in SI units? (2023)
A.
Pascal
B.
Bar
C.
Atmosphere
D.
Torr
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Solution
The SI unit of pressure is Pascal (Pa), which is equivalent to N/m².
Correct Answer: A — Pascal
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Q. What is the unit of pressure in SI? (2023)
A.
Pascal
B.
Bar
C.
Atmosphere
D.
Torr
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Solution
The SI unit of pressure is Pascal (Pa), which is equivalent to N/m².
Correct Answer: A — Pascal
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Q. What is the unit of the gas constant R in the ideal gas law? (2023)
A.
L·atm/(K·mol)
B.
J/(K·mol)
C.
L·K/(mol·s)
D.
atm/(K·mol)
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Solution
The gas constant R is commonly expressed in the unit L·atm/(K·mol).
Correct Answer: A — L·atm/(K·mol)
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Q. What is the value of the gravitational constant (G) in SI units? (2023)
A.
6.67 x 10^-11 N m²/kg²
B.
9.81 m/s²
C.
3.00 x 10^8 m/s
D.
1.60 x 10^-19 C
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Solution
The gravitational constant (G) is 6.67 x 10^-11 N m²/kg².
Correct Answer: A — 6.67 x 10^-11 N m²/kg²
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Q. What is the van 't Hoff factor (i) for a non-electrolyte solute? (2023)
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Solution
The van 't Hoff factor (i) for a non-electrolyte solute is 1, as it does not dissociate into ions.
Correct Answer: A — 1
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Q. What is the van 't Hoff factor (i) for a solution of glucose (C6H12O6)? (2023)
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Solution
Glucose does not dissociate in solution, so the van 't Hoff factor (i) = 1.
Correct Answer: A — 1
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Q. What is the van 't Hoff factor (i) for a strong electrolyte like Na2SO4 in solution? (2023)
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Solution
Na2SO4 dissociates into 3 ions (2 Na⁺ and 1 SO4²⁻), so i = 3.
Correct Answer: C — 3
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Q. What is the vapor pressure of a solution containing 1 mole of solute in 10 moles of solvent, assuming ideal behavior? (2019)
A.
0.1 P0
B.
0.9 P0
C.
0.5 P0
D.
0.2 P0
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Solution
Using Raoult's law, the vapor pressure of the solution = (moles of solvent / total moles) * P0 = (10 / 11) * P0 ≈ 0.909 P0.
Correct Answer: B — 0.9 P0
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Q. What is the vapor pressure of a solution containing 1 mole of solute in 9 moles of solvent, assuming ideal behavior? (2019)
A.
0.1 P0
B.
0.9 P0
C.
0.5 P0
D.
0.2 P0
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Solution
Using Raoult's law, the vapor pressure of the solution = (moles of solvent / total moles) * P0 = (9 / 10) * P0 = 0.9 P0.
Correct Answer: B — 0.9 P0
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Q. What is the vapor pressure of a solution containing 2 moles of solute and 3 moles of solvent, assuming ideal behavior? (2022)
A.
0.4 P0
B.
0.6 P0
C.
0.2 P0
D.
0.8 P0
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Solution
Vapor pressure of solution = (moles of solvent / total moles) * P0 = (3 / (2 + 3)) * P0 = 0.6 P0.
Correct Answer: B — 0.6 P0
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Q. What is the vapor pressure of a solution containing 2 moles of solute and 4 moles of solvent compared to pure solvent? (2022)
A.
1/3
B.
1/2
C.
2/3
D.
1/4
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Solution
Vapor pressure lowering = (moles of solute / total moles) = 2 / (2 + 4) = 2/6 = 1/3. Thus, vapor pressure is 1/2 of pure solvent.
Correct Answer: B — 1/2
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Q. What is the vapor pressure of a solution containing 2 moles of solute and 4 moles of solvent, assuming ideal behavior? (2022)
A.
0.33 P0
B.
0.50 P0
C.
0.67 P0
D.
0.75 P0
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Solution
Vapor pressure = (moles of solvent / total moles) * P0 = (4 / (2 + 4)) * P0 = (4/6) * P0 = 0.67 P0.
Correct Answer: C — 0.67 P0
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Q. What is the voltage across a 10Ω resistor carrying a current of 2A? (2022)
A.
5V
B.
10V
C.
15V
D.
20V
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Solution
Using Ohm's law, V = I * R = 2A * 10Ω = 20V.
Correct Answer: B — 10V
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Q. What is the voltage drop across a 10Ω resistor carrying a current of 2A? (2019)
A.
5V
B.
10V
C.
15V
D.
20V
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Solution
Using Ohm's law, V = I * R = 2A * 10Ω = 20V.
Correct Answer: B — 10V
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Q. What is the voltage drop across a 3Ω resistor carrying a current of 4A? (2019)
A.
6V
B.
8V
C.
12V
D.
15V
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Solution
Using Ohm's law, V = I * R = 4A * 3Ω = 12V.
Correct Answer: C — 12V
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Q. What is the wavelength of light emitted when an electron transitions from n=3 to n=1 in a hydrogen atom? (2020)
A.
102.6 nm
B.
656.3 nm
C.
486.1 nm
D.
434.0 nm
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Solution
Using the Rydberg formula, the wavelength for the transition from n=3 to n=1 can be calculated to be approximately 102.6 nm.
Correct Answer: A — 102.6 nm
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Q. What is the wavelength of light emitted when an electron transitions from n=4 to n=2 in a hydrogen atom? (2020)
A.
486 nm
B.
656 nm
C.
434 nm
D.
410 nm
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Solution
Using the Rydberg formula, the wavelength for the transition from n=4 to n=2 can be calculated to be approximately 486 nm.
Correct Answer: A — 486 nm
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Q. What is the wavelength of light if the first-order maximum occurs at an angle of 30° in a double-slit experiment with a slit separation of 0.1 mm and a screen distance of 1 m? (2019)
A.
0.5 mm
B.
0.3 mm
C.
0.2 mm
D.
0.1 mm
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Solution
Using the formula λ = d sin θ / m, where d = 0.1 mm, θ = 30°, and m = 1, we find λ = 0.1 mm * sin(30°) = 0.1 mm * 0.5 = 0.05 mm = 0.2 mm.
Correct Answer: C — 0.2 mm
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