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Physics · Question 211
At fixed capacitance, doubling the voltage across a capacitor changes its stored energy to:
Four times its original value
Twice its original value
Half its original value
One quarter its original value
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Correct answer: A
Four times its original value
Stored energy is CV squared divided by 2, so doubling voltage quadruples energy.
Physics · Question 212
A voltmeter measures the potential difference across a resistor when connected:
In place of the power source
In parallel with it
In series with it
Only to one terminal
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Correct answer: B
In parallel with it
A parallel connection places the voltmeter across the same two terminals.
Physics · Question 213
Which Kepler law relates orbital period squared to orbital semi-major axis cubed?
Second law
A fourth law
Third law
First law
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Correct answer: C
Third law
Kepler third law gives T squared proportional to a cubed for objects orbiting the same central mass.
Physics · Question 214
In an ideal transformer, which property of the alternating supply is unchanged between primary and secondary?
Voltage in every case
Current in every case
Number of coil turns
Frequency
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Correct answer: D
Frequency
A transformer changes voltage and current ratios, but both windings operate at the same frequency.
Chemistry · Question 215
Which principle limits one atomic orbital to two electrons with opposite spins?
Pauli exclusion principle
Boyle law
Le Chatelier principle
Graham law
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Correct answer: A
Pauli exclusion principle
No two electrons in an atom share all four quantum numbers; an orbital permits two opposite spins.
Chemistry · Question 216
The hydrogen Paschen series lies in which spectral region?
Gamma-ray
Infrared
Visible
X-ray
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Correct answer: B
Infrared
Paschen transitions end at principal quantum number 3 and emit infrared radiation.
Chemistry · Question 217
Which subatomic particle did James Chadwick discover in 1932?
Proton
Positron
Neutron
Electron
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Correct answer: C
Neutron
Chadwick established the existence of the electrically neutral neutron.
Chemistry · Question 218
The amount of product actually obtained in an experiment is called the:
Theoretical yield
Molar volume
Activation energy
Actual yield
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Correct answer: D
Actual yield
Actual yield is measured experimentally; theoretical yield is the calculated maximum.
Chemistry · Question 219
Degenerate orbitals have the same:
Energy
Spatial orientation in every case
Electron spin in every case
Shape in every case
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Correct answer: A
Energy
Degeneracy means equality of energy, not necessarily identical shape or orientation.
Biology · Question 220
An animal stores glucose as which polysaccharide?
Sucrose
Glycogen
Cellulose
Chitin
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Correct answer: B
Glycogen
Glycogen is the principal animal storage polysaccharide.