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Physics · Question 451
The SI unit of a spring constant is identical to the SI unit of:
Surface tension
Force
Loudness
Pressure
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Correct answer: A
Surface tension
A spring constant and surface tension are both measured in newtons per metre.
Physics · Question 452
Transverse mechanical waves can readily propagate through:
A gas mixture
Air
A stretched string
A vacuum only
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Correct answer: C
A stretched string
A stretched string supports transverse mechanical disturbances; ordinary sound in gases is longitudinal.
Physics · Question 453
At constant temperature, the volume of a fixed mass of gas is doubled. What happens to its density?
It remains constant
It becomes half
It becomes four times
It doubles
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Correct answer: B
It becomes half
Density is mass divided by volume. With fixed mass and doubled volume, density is halved.
Physics · Question 454
For an ideal gas undergoing an isothermal process, its internal energy:
Increases
Always becomes zero
Decreases
Remains constant
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Correct answer: D
Remains constant
The internal energy of an ideal gas depends only on temperature, which remains constant in an isothermal process.
Physics · Question 455
If 1.0 × 10¹⁴ electrons are removed from a neutral metal sphere, what charge remains on it?
+32 μC
+16 μC
−32 μC
−16 μC
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Correct answer: B
+16 μC
Removing electrons leaves a positive charge: q = ne = 10¹⁴ × 1.6 × 10⁻¹⁹ C = 16 μC.
Physics · Question 456
The current in a 5 H inductor decreases at 2 A/s. What is the magnitude of the induced emf?
0.1 V
2.5 V
0.4 V
10 V
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Correct answer: D
10 V
The magnitude is L|di/dt| = 5 × 2 = 10 V.
Physics · Question 457
An alternating current has an RMS value of 10 A. What is its peak value?
7.07 A
14.14 A
20 A
10 A
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Correct answer: B
14.14 A
For a sinusoidal current, I_peak = √2 I_RMS = 14.14 A.
Physics · Question 458
A wire under a fixed load has its radius doubled. If other conditions remain unchanged, its extension becomes:
Twice as large
Half as large
One-eighth as large
One-fourth as large
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Correct answer: D
One-fourth as large
Extension is inversely proportional to cross-sectional area, and area is proportional to radius squared.
Physics · Question 459
Energy bands in solids arise principally because of the:
Heisenberg uncertainty principle only
Pauli exclusion principle
Pascal principle
Bohr correspondence principle
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Correct answer: B
Pauli exclusion principle
When atoms form a solid, the Pauli exclusion principle leads closely spaced atomic energy levels to split into bands.
Chemistry · Question 460
Acetone and chloroform mix readily mainly because they form:
Ion–dipole attractions
Intermolecular hydrogen bonds
Ionic bonds
Metallic bonds
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Correct answer: B
Intermolecular hydrogen bonds
The hydrogen of chloroform can interact with the carbonyl oxygen of acetone through hydrogen bonding.