Q. What is the effect on the interference pattern if the wavelength of light used in a double-slit experiment is increased? (2023)
A.
Fringe width decreases
B.
Fringe width increases
C.
Fringe separation remains the same
D.
Fringe visibility decreases
Show solution
Solution
Increasing the wavelength increases the fringe width, as fringe width β is directly proportional to the wavelength.
Correct Answer:
B
— Fringe width 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 effect on total resistance when more resistors are added in parallel? (2022)
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes zero
Show solution
Solution
Adding resistors in parallel decreases the total resistance.
Correct Answer:
B
— It 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 distance of 1 m from a charge of +10 µC? (2019)
A.
9000 N/C
B.
10000 N/C
C.
11000 N/C
D.
12000 N/C
Show solution
Solution
E = k * |q| / r² = (9 × 10^9 N m²/C²) * (10 × 10^-6 C) / (1 m)² = 9000 N/C.
Correct Answer:
B
— 10000 N/C
Learn More →
Q. What is the electric field at a distance of 1 m from a charge of -4 μC? (2019)
A.
-3600 N/C
B.
-900 N/C
C.
900 N/C
D.
3600 N/C
Show solution
Solution
E = k * |q| / r² = (9 × 10^9 N m²/C²) * (4 × 10^-6 C) / (1 m)² = 3600 N/C, directed towards the charge.
Correct Answer:
A
— -3600 N/C
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 +10 µC at a distance of 0.1 m? (2023)
A.
9000 N/C
B.
900 N/C
C.
90 N/C
D.
9 N/C
Show solution
Solution
Electric field E = k * |q| / r² = (9 × 10^9 N m²/C²) * (10 × 10^-6 C) / (0.1 m)² = 9000 N/C.
Correct Answer:
A
— 9000 N/C
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=3 to n=2 in a hydrogen atom? (Rydberg constant R = 1.097 x 10^7 m^-1) (2021)
A.
1.89 eV
B.
3.40 eV
C.
4.86 eV
D.
5.13 eV
Show solution
Solution
Energy = 13.6 eV * (1/n1^2 - 1/n2^2) = 13.6 * (1/2^2 - 1/3^2) = 3.40 eV.
Correct Answer:
B
— 3.40 eV
Learn More →
Q. What is the energy of a photon emitted when an electron transitions from n=3 to n=2 in a hydrogen atom? (2019)
A.
1.89 eV
B.
3.40 eV
C.
10.20 eV
D.
12.09 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=3, E = 13.6 eV (1/2² - 1/3²) = 1.89 eV.
Correct Answer:
A
— 1.89 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 compared to nuclear fission? (2023)
A.
Less
B.
Equal
C.
More
D.
None
Show solution
Solution
The energy released in nuclear fusion is generally more than that released in nuclear fission, making it a powerful energy source.
Correct Answer:
C
— More
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 4μF charged to 12V? (2022)
A.
24μJ
B.
28.8μJ
C.
48μJ
D.
72μJ
Show solution
Solution
The energy stored (U) is given by U = 1/2 CV². Thus, U = 1/2 * 4μF * (12V)² = 288μJ.
Correct Answer:
C
— 48μJ
Learn More →
Q. What is the energy stored in a capacitor of capacitance 5μF charged to a potential difference of 10V? (2023)
A.
0.25mJ
B.
0.5mJ
C.
0.75mJ
D.
1mJ
Show solution
Solution
Using the formula U = 1/2 CV², we have U = 1/2 * 5μF * (10V)² = 0.5mJ.
Correct Answer:
B
— 0.5mJ
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 a plane passing through the point (1, 2, 3) with normal vector (1, 1, 1)? (2022)
A.
x + y + z = 6
B.
x + y + z = 3
C.
x + y + z = 1
D.
x + y + z = 0
Show solution
Solution
Equation of the plane: 1(x-1) + 1(y-2) + 1(z-3) = 0 => x + y + z = 6.
Correct Answer:
A
— x + y + z = 6
Learn More →
Q. What is the equation of a plane passing through the point (1, 2, 3) with normal vector (2, -1, 3)? (2021)
A.
2x - y + 3z = 12
B.
2x + y - 3z = 0
C.
2x - y + 3z = 0
D.
2x + y + 3z = 12
Show solution
Solution
Equation of the plane: 2(x-1) - 1(y-2) + 3(z-3) = 0 simplifies to 2x - y + 3z = 12.
Correct Answer:
C
— 2x - y + 3z = 0
Learn More →
Showing 2521 to 2550 of 5509 (184 Pages)
