Undergraduate
Q. What is the effect of temperature on chemisorption? (2023)
A.
Increases with temperature
B.
Decreases with temperature
C.
Remains constant
D.
Depends on the gas
Show solution
Solution
Chemisorption typically decreases with an increase in temperature because it involves the formation of stronger chemical bonds, which are less favorable at higher thermal energies.
Correct Answer: B — Decreases with temperature
Learn More →
Q. What is the effect of temperature on chemisorption? (2023) 2023
A.
Increases with temperature
B.
Decreases with temperature
C.
Remains constant
D.
Depends on the gas
Show solution
Solution
Chemisorption typically decreases with an increase in temperature because it involves the formation of stronger chemical bonds, which are less favorable at higher thermal energies.
Correct Answer: B — Decreases with temperature
Learn More →
Q. What is the effect of temperature on the cell potential according to the Nernst equation?
A.
Increases with temperature
B.
Decreases with temperature
C.
No effect
D.
Depends on the reaction
Show solution
Solution
According to the Nernst equation, the cell potential generally increases with temperature.
Correct Answer: A — Increases with temperature
Learn More →
Q. What is the effect of temperature on the conductivity of intrinsic semiconductors? (2021)
A.
Conductivity decreases
B.
Conductivity remains constant
C.
Conductivity increases
D.
Conductivity becomes zero
Show solution
Solution
As temperature increases, more electrons gain enough energy to jump the band gap, increasing conductivity.
Correct Answer: C — Conductivity increases
Learn More →
Q. What is the effect of temperature on the conductivity of semiconductors? (2019)
A.
Conductivity decreases
B.
Conductivity remains constant
C.
Conductivity increases
D.
Conductivity becomes zero
Show solution
Solution
As temperature increases, the conductivity of semiconductors increases due to the generation of more charge carriers.
Correct Answer: C — Conductivity increases
Learn More →
Q. What is the effect on the fringe separation in a double-slit experiment if the distance between the slits and the screen is increased? (2021)
A.
Fringe separation decreases
B.
Fringe separation increases
C.
Fringe separation remains the same
D.
Fringe separation becomes zero
Show solution
Solution
Fringe separation is directly proportional to the distance from the slits to the screen. Increasing this distance increases the fringe separation.
Correct Answer: B — Fringe separation increases
Learn More →
Q. What is the effect on the total resistance in a series circuit if one resistor is removed? (2023)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
Removing a resistor from a series circuit decreases the total resistance since the sum of the remaining resistances is less.
Correct Answer: B — Decreases
Learn More →
Q. What is the efficiency of a Carnot engine operating between 300 K and 600 K? (2022)
A.
0.5
B.
0.33
C.
0.25
D.
0.67
Show solution
Solution
Efficiency = 1 - (T_c/T_h) = 1 - (300/600) = 0.5.
Correct Answer: A — 0.5
Learn More →
Q. What is the efficiency of a Carnot engine operating between 500 K and 300 K? (2022)
A.
0.4
B.
0.5
C.
0.6
D.
0.7
Show solution
Solution
Efficiency = 1 - (T2/T1) = 1 - (300/500) = 0.4 or 40%.
Correct Answer: C — 0.6
Learn More →
Q. What is the efficiency of a Carnot engine operating between a hot reservoir at 600 K and a cold reservoir at 300 K?
A.
0.5
B.
0.33
C.
0.25
D.
0.75
Show solution
Solution
Efficiency (η) = 1 - (T_c/T_h) = 1 - (300/600) = 0.5 or 50%.
Correct Answer: B — 0.33
Learn More →
Q. What is the efficiency of a Carnot engine operating between temperatures of 500 K and 300 K?
A.
0.4
B.
0.5
C.
0.6
D.
0.7
Show solution
Solution
Efficiency (η) = 1 - (T2/T1) = 1 - (300/500) = 0.4 or 40%.
Correct Answer: C — 0.6
Learn More →
Q. What is the efficiency of a Carnot engine operating between temperatures T1 and T2? (2019) 2019
A.
(T1 - T2) / T1
B.
T2 / T1
C.
(T1 - T2) / T2
D.
1 - (T2 / T1)
Show solution
Solution
The efficiency (η) of a Carnot engine is given by η = 1 - (T2 / T1), where T1 is the higher temperature and T2 is the lower temperature.
Correct Answer: D — 1 - (T2 / T1)
Learn More →
Q. What is the electric field at a point due to a uniformly charged infinite plane sheet? (2020)
A.
0
B.
σ/2ε₀
C.
σ/ε₀
D.
σ/4ε₀
Show solution
Solution
The electric field due to an infinite plane sheet is E = σ/2ε₀ on both sides, but the total field is σ/ε₀.
Correct Answer: C — σ/ε₀
Learn More →
Q. What is the electric field due to a point charge at a distance 'r' from it? (2021)
A.
k * q / r^2
B.
k * q / r
C.
k * q * r
D.
k * q * r^2
Show solution
Solution
The electric field (E) due to a point charge (q) at a distance (r) is given by E = k * q / r^2, where k is Coulomb's constant.
Correct Answer: A — k * q / r^2
Learn More →
Q. What is the electric field due to a point charge of +3 µC at a distance of 0.3 m?
A.
30 N/C
B.
90 N/C
C.
300 N/C
D.
900 N/C
Show solution
Solution
E = k * |q| / r^2 = (9 × 10^9) * (3 × 10^-6) / (0.3)^2 = 90 N/C.
Correct Answer: B — 90 N/C
Learn More →
Q. What is the electric field due to a point charge of +5 µC at a distance of 0.2 m? (2022)
A.
11250 N/C
B.
5625 N/C
C.
22500 N/C
D.
4500 N/C
Show solution
Solution
Using E = k * |q| / r² = (9 × 10^9 N m²/C²) * (5 × 10^-6 C) / (0.2 m)² = 11250 N/C.
Correct Answer: A — 11250 N/C
Learn More →
Q. What is the electric potential at a point 0.4 m away from a charge of +5 µC?
A.
45 V
B.
50 V
C.
55 V
D.
60 V
Show solution
Solution
V = k * q / r = (9 × 10^9) * (5 × 10^-6) / 0.4 = 112.5 V.
Correct Answer: B — 50 V
Learn More →
Q. What is the electric potential at a point due to a charge Q at a distance r? (2021)
A.
kQ/r
B.
kQr
C.
kQ/r^2
D.
0
Show solution
Solution
The electric potential (V) at a distance r from a point charge Q is given by V = kQ/r.
Correct Answer: A — kQ/r
Learn More →
Q. What is the electron configuration of Chromium?
A.
[Ar] 3d4 4s2
B.
[Ar] 3d5 4s1
C.
[Ar] 3d6 4s2
D.
[Ar] 3d3 4s2
Show solution
Solution
Chromium (Cr) has the electron configuration [Ar] 3d5 4s1 due to stability of half-filled d-orbitals.
Correct Answer: B — [Ar] 3d5 4s1
Learn More →
Q. What is the electrostatic potential at a point due to a point charge Q located at a distance r from the charge? (2021)
A.
kQ/r
B.
kQr
C.
kQ/r^2
D.
kQ^2/r
Show solution
Solution
The electrostatic potential V at a distance r from a point charge Q is given by V = kQ/r, where k is Coulomb's constant.
Correct Answer: A — kQ/r
Learn More →
Q. What is the energy band gap of a typical semiconductor? (2021)
A.
0.1 eV
B.
1.1 eV
C.
2.0 eV
D.
3.5 eV
Show solution
Solution
The energy band gap of a typical semiconductor like silicon is approximately 1.1 eV.
Correct Answer: B — 1.1 eV
Learn More →
Q. What is the energy of a photon emitted when an electron transitions from n=4 to n=2 in a hydrogen atom? (2019)
A.
10.2 eV
B.
12.1 eV
C.
1.89 eV
D.
3.4 eV
Show solution
Solution
The energy difference can be calculated using the formula E = 13.6 eV (1/n1² - 1/n2²). For n1=2 and n2=4, E = 13.6(1/2² - 1/4²) = 10.2 eV.
Correct Answer: A — 10.2 eV
Learn More →
Q. What is the energy released in nuclear fusion primarily due to? (2023)
A.
Mass defect
B.
Chemical bonds
C.
Nuclear forces
D.
Electromagnetic interactions
Show solution
Solution
The energy released in nuclear fusion is primarily due to the mass defect, where the mass of the resulting nucleus is less than the sum of the masses of the individual nucleons.
Correct Answer: A — Mass defect
Learn More →
Q. What is the energy stored in a capacitor of capacitance C charged to a potential V? (2021)
A.
CV
B.
1/2 CV^2
C.
1/2 QV
D.
QV
Show solution
Solution
The energy (U) stored in a capacitor is given by the formula U = 1/2 CV^2.
Correct Answer: B — 1/2 CV^2
Learn More →
Q. What is the equation of the line parallel to y = 3x + 4 that passes through the point (2, 5)? (2022)
A.
y = 3x - 1
B.
y = 3x + 1
C.
y = 3x + 2
D.
y = 3x + 3
Show solution
Solution
Since parallel lines have the same slope, the equation is y - 5 = 3(x - 2) which simplifies to y = 3x + 1.
Correct Answer: B — y = 3x + 1
Learn More →
Q. What is the equation of the line parallel to y = 3x - 5 that passes through the point (2, 1)?
A.
y = 3x - 8
B.
y = 3x + 5
C.
y = 3x - 1
D.
y = 3x + 1
Show solution
Solution
Since the lines are parallel, they have the same slope. Using point-slope form: y - 1 = 3(x - 2) gives y = 3x - 8.
Correct Answer: A — y = 3x - 8
Learn More →
Q. What is the equation of the line passing through (0, 0) and (2, 4)? (2019)
A.
y = 2x
B.
y = x
C.
y = 4x
D.
y = 3x
Show solution
Solution
Slope = (4-0)/(2-0) = 2, so the equation is y = 2x.
Correct Answer: A — y = 2x
Learn More →
Q. What is the equation of the line passing through (2, 3) with a slope of 2? (2021)
A.
y = 2x - 1
B.
y = 2x + 1
C.
y = 2x + 3
D.
y = 2x - 3
Show solution
Solution
Using point-slope form: y - 3 = 2(x - 2) => y = 2x - 4 + 3 => y = 2x - 1.
Correct Answer: B — y = 2x + 1
Learn More →
Q. What is the equation of the line passing through the points (1, 2) and (3, 4)?
A.
y = x + 1
B.
y = 2x
C.
y = x + 2
D.
y = 2x - 2
Show solution
Solution
The slope m = (4 - 2) / (3 - 1) = 1. Using point-slope form, y - 2 = 1(x - 1) gives y = x + 1.
Correct Answer: A — y = x + 1
Learn More →
Q. What is the equation of the line passing through the points (1, 2) and (3, 6)?
A.
y = 2x
B.
y = 3x - 1
C.
y = x + 1
D.
y = 4x - 2
Show solution
Solution
The slope m = (6 - 2) / (3 - 1) = 2. Using point-slope form, y - 2 = 2(x - 1) gives y = 2x.
Correct Answer: A — y = 2x
Learn More →
Showing 1351 to 1380 of 3151 (106 Pages)