What does a region where electric field lines are drawn closer together indicate?
Correct answer A. A stronger electric field
Subject / 480 questions
MDCAT ECAT Physics MCQs
Page 14 of MDCAT ECAT Physics multiple-choice questions with answers. Tap an option to check yourself.
Page 14 of 24
- Electromagnetic Induction 30
- Fluid Dynamics 30
- Electrostatics 30
- Electronics 30
- Electromagnetism 30
- Current Electricity 30
- Work and Energy 30
- Waves 30
- Vectors and Equilibrium 30
- Nuclear Physics 30
- Dawn of Modern Physics 30
- Thermodynamics 30
- Rotational and Circular Motion 30
- Atomic Spectra 30
- Alternating Current 30
- Force and Motion 30
How does the electric field near a large (effectively infinite) uniformly charged plane sheet vary with distance from the sheet?
Correct answer C. It is independent of the distance
During an isothermal expansion of an ideal gas, which statement is correct?
Correct answer B. The heat absorbed equals the work done by the gas
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When an ideal gas expands adiabatically, its temperature ____.
Correct answer C. falls, because work is done at the expense of internal energy
A gas is compressed adiabatically and 600 J of work is done on it. What is the change in its internal energy?
Correct answer B. +600 J
How much heat is needed to raise the temperature of 2.0 mol of an ideal gas by 10 K at constant pressure (Cp = 29.1 J mol⁻¹ K⁻¹)?
Correct answer D. 5.8 × 10² J
3.0 mol of an ideal gas is heated at constant pressure through 20 K. How much work does the gas do (R = 8.31 J mol⁻¹ K⁻¹)?
Correct answer A. 5.0 × 10² J
The internal energy of a fixed mass of an ideal gas depends only on its ____.
Correct answer A. temperature
Which of the following is a state function of a thermodynamic system?
Correct answer A. Internal energy
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A gas is taken through a complete cycle and returns to its initial state. Which statement is correct?
Correct answer D. The net heat absorbed equals the net work done by the gas
A hot metal block is dropped into cold water in an insulated container. Which statement is correct once thermal equilibrium is reached?
Correct answer D. Heat lost by the block equals heat gained by the water
Two point charges of 2.0 μC and 3.0 μC are 0.30 m apart in air. What is the force between them (k = 9.0 × 10⁹ N m² C⁻²)?
Correct answer B. 0.60 N
If the distance between two point charges is halved, the electrostatic force between them becomes ____.
Correct answer D. four times as great
Two charges are moved from air into water of relative permittivity 80 while their separation stays the same. The force between them becomes ____.
Correct answer D. 1/80 of its value in air
The force between two charges in air is 0.40 N. What is the force when they are placed at the same separation in oil of relative permittivity 4.0?
Correct answer C. 0.10 N
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Which is the correct value and unit of the permittivity of free space, ε₀?
Correct answer A. 8.85 × 10⁻¹² C² N⁻¹ m⁻²
Which statement about the relative permittivity εᵣ of a medium is correct?
Correct answer C. It is dimensionless and is never less than 1
If both of two point charges are doubled and the distance between them is also doubled, the force between them ____.
Correct answer D. remains the same
Electric field intensity at a point is defined as the ____.
Correct answer A. force per unit positive test charge placed at that point
The relation Cp − Cv = R applies to ____.
Correct answer A. the molar specific heats of an ideal gas