Q. What is the work done by a gas during expansion at constant pressure?
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Solution
The work done by a gas during expansion at constant pressure is given by W = PΔV.
Correct Answer: A — PΔV
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Q. What is the work done by a gas during isothermal expansion?
A.
Zero
B.
Depends on the temperature
C.
Is equal to the heat absorbed
D.
Is equal to the change in internal energy
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Solution
During isothermal expansion, the work done by the gas is equal to the heat absorbed, as the internal energy remains constant.
Correct Answer: C — Is equal to the heat absorbed
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Q. What is the work done by an ideal gas during an isobaric process?
A.
PΔV
B.
nRT
C.
0
D.
nRΔT
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Solution
The work done by an ideal gas during an isobaric process is given by W = PΔV.
Correct Answer: A — PΔV
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Q. What is the work done by an ideal gas during an isothermal expansion from volume Vi to Vf?
A.
nRT ln(Vf/Vi)
B.
nR(Tf - Ti)
C.
Zero
D.
nRT
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Solution
The work done by an ideal gas during an isothermal expansion is W = nRT ln(Vf/Vi).
Correct Answer: A — nRT ln(Vf/Vi)
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Q. What is the work done by an ideal gas during an isothermal expansion?
A.
Zero
B.
nRT ln(Vf/Vi)
C.
nRT (Vf - Vi)
D.
nR (Tf - Ti)
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Solution
The work done by an ideal gas during an isothermal expansion is given by W = nRT ln(Vf/Vi).
Correct Answer: B — nRT ln(Vf/Vi)
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Q. What is the work done by friction when a 5 kg block slides 2 m on a surface with a coefficient of kinetic friction of 0.4?
A.
-4 N·m
B.
-8 N·m
C.
-10 N·m
D.
-20 N·m
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Solution
Frictional force F_friction = μk * N = 0.4 * 5 kg * 9.8 m/s² = 19.6 N. Work done by friction = -F_friction * distance = -19.6 N * 2 m = -39.2 N·m, approximately -40 N·m.
Correct Answer: B — -8 N·m
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Q. What is the work done by the system during an isochoric process?
A.
Positive
B.
Negative
C.
Zero
D.
Depends on the temperature
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Solution
In an isochoric process, the volume remains constant, so no work is done by the system (W = PΔV = 0).
Correct Answer: C — Zero
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Q. What is the work done by the system in an isochoric process?
A.
Positive
B.
Negative
C.
Zero
D.
Depends on the temperature
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Solution
In an isochoric process, the volume remains constant, so no work is done by the system (W = PΔV = 0).
Correct Answer: C — Zero
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Q. What is the work done by the system when it expands against a constant external pressure?
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Solution
The work done by the system during expansion against a constant external pressure is given by W = PΔV.
Correct Answer: A — PΔV
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Q. What is the work done in moving a charge of +2μC from a point A to B in a uniform electric field of 500 N/C over a distance of 0.4m?
A.
400 J
B.
200 J
C.
100 J
D.
80 J
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Solution
Work done W = F * d = q * E * d = (2 × 10^-6 C) * (500 N/C) * (0.4 m) = 0.4 J = 80 J.
Correct Answer: D — 80 J
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Q. What is the work done in moving a charge of +2μC through a potential difference of 10V?
A.
20 μJ
B.
200 μJ
C.
2 μJ
D.
0.2 μJ
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Solution
W = q * V = 2 × 10^-6 C * 10 V = 20 × 10^-6 J = 20 μJ.
Correct Answer: B — 200 μJ
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Q. What is the work done in moving a charge of +2μC through a potential difference of 5V?
A.
10 μJ
B.
5 μJ
C.
2 μJ
D.
1 μJ
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Solution
Work done W = q * V = (2 × 10^-6 C) * (5 V) = 10 μJ.
Correct Answer: A — 10 μJ
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Q. What is the work done in moving a charge of 2 μC from a point at 50 V to a point at 100 V?
A.
0.1 mJ
B.
0.2 mJ
C.
0.3 mJ
D.
0.4 mJ
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Solution
Work done W = q * ΔV = 2 × 10^-6 C * (100 V - 50 V) = 2 × 10^-6 * 50 = 0.1 mJ.
Correct Answer: B — 0.2 mJ
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Q. What is the work done in moving a charge of 2 μC from a point at 50 V to another at 100 V?
A.
100 μJ
B.
200 μJ
C.
150 μJ
D.
50 μJ
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Solution
Work done W = q * ΔV = (2 × 10^-6 C) * (100 V - 50 V) = 100 μJ.
Correct Answer: B — 200 μJ
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Q. What is the work done in moving a mass from a point A to point B in a uniform gravitational field?
A.
Depends on the path taken
B.
Zero
C.
Equal to the change in gravitational potential energy
D.
Equal to the gravitational force times distance
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Solution
The work done is equal to the change in gravitational potential energy, which depends on the initial and final positions.
Correct Answer: C — Equal to the change in gravitational potential energy
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Q. What is the work done in moving an object from a point A to point B in a uniform gravitational field?
A.
Depends on the path taken
B.
Zero
C.
Depends on the mass of the object
D.
Depends on the height difference
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Solution
The work done in moving an object in a uniform gravitational field depends only on the height difference between points A and B.
Correct Answer: D — Depends on the height difference
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Q. What is the work done in moving an object from one point to another in a gravitational field?
A.
Depends on the path taken
B.
Is always zero
C.
Depends only on the initial and final positions
D.
Is maximum at the highest point
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Solution
The work done in moving an object in a gravitational field depends only on the initial and final positions, not the path taken.
Correct Answer: C — Depends only on the initial and final positions
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Q. What is the work done on a gas during an isochoric process?
A.
Positive
B.
Negative
C.
Zero
D.
Depends on the gas
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Solution
In an isochoric process, the volume remains constant, which means no work is done on or by the gas. Therefore, the work done is zero.
Correct Answer: C — Zero
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Q. What is the work function of a metal if the threshold frequency is 5 x 10^14 Hz?
A.
3.1 eV
B.
2.5 eV
C.
4.1 eV
D.
1.6 eV
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Solution
The work function φ can be calculated using φ = hf, where h = 6.63 x 10^-34 J.s and f = 5 x 10^14 Hz, giving φ ≈ 3.1 eV.
Correct Answer: A — 3.1 eV
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Q. What is the work function of a metal?
A.
The energy required to ionize an atom
B.
The energy required to remove an electron from the surface of a metal
C.
The energy of the emitted electrons
D.
The energy of the incident photons
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Solution
The work function is the minimum energy required to remove an electron from the surface of a metal.
Correct Answer: B — The energy required to remove an electron from the surface of a metal
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Q. What is the work-energy theorem?
A.
Work done is equal to change in momentum
B.
Work done is equal to change in kinetic energy
C.
Work done is equal to change in potential energy
D.
Work done is equal to change in total energy
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Solution
The work-energy theorem states that the work done on an object is equal to the change in its kinetic energy.
Correct Answer: B — Work done is equal to change in kinetic energy
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Q. What is the x-intercept of the line 3x + 4y - 12 = 0?
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Solution
To find the x-intercept, set y = 0. Thus, 3x - 12 = 0 gives x = 4.
Correct Answer: B — 3
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Q. What is the y-intercept of the line 5x + 2y - 10 = 0?
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Solution
Setting x = 0 in the equation gives 2y - 10 = 0, thus y = 5.
Correct Answer: C — 2
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Q. What is the y-intercept of the line represented by the equation 5x + 2y = 10?
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Solution
Set x = 0: 2y = 10 => y = 5. The y-intercept is (0, 5).
Correct Answer: B — 2
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Q. What phenomenon occurs when a liquid rises in a narrow tube against gravity?
A.
Viscosity
B.
Surface tension
C.
Capillarity
D.
Hydrostatic pressure
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Solution
Capillarity is the phenomenon where liquid rises in a narrow tube due to surface tension.
Correct Answer: C — Capillarity
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Q. What role do enzymes play in biological systems?
A.
They provide structural support
B.
They act as catalysts for biochemical reactions
C.
They store genetic information
D.
They transport molecules across membranes
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Solution
Enzymes are proteins that act as catalysts, speeding up biochemical reactions without being consumed in the process.
Correct Answer: B — They act as catalysts for biochemical reactions
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Q. What type of adsorption is characterized by the formation of strong chemical bonds?
A.
Physisorption
B.
Chemisorption
C.
Desorption
D.
Multilayer adsorption
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Solution
Chemisorption is characterized by the formation of strong chemical bonds between the adsorbate and the adsorbent.
Correct Answer: B — Chemisorption
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Q. What type of adsorption occurs when the adsorbate forms strong chemical bonds with the adsorbent?
A.
Physisorption
B.
Chemisorption
C.
Desorption
D.
Sorption
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Solution
Chemisorption involves the formation of strong chemical bonds between the adsorbate and the adsorbent.
Correct Answer: B — Chemisorption
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Q. What type of alcohol is isopropanol?
A.
Primary
B.
Secondary
C.
Tertiary
D.
None of the above
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Solution
Isopropanol (2-propanol) is a secondary alcohol, as the hydroxyl group is attached to a carbon that is connected to two other carbons.
Correct Answer: B — Secondary
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Q. What type of biomolecule are enzymes classified as?
A.
Carbohydrates
B.
Proteins
C.
Lipids
D.
Nucleic acids
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Solution
Enzymes are primarily proteins that catalyze biochemical reactions.
Correct Answer: B — Proteins
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