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Biology · Question 141
A symporter transports two substances across a membrane in:
A direction unrelated to the membrane
Separate vesicles only
Opposite directions
The same direction
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Correct answer: D
The same direction
Symport couples movement of two substances in the same direction.
Chemistry · Question 142
An atom loses two electrons without changing its nucleus. What is its resulting charge?
2+
2-
1-
Zero (neutral)
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Correct answer: A
2+
Losing two negative electrons produces a net charge of 2+.
Chemistry · Question 143
What is the formula of the neutral ionic compound formed from Mg2+ and Cl-?
MgCl
MgCl2
Mg2Cl
Mg2Cl3
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Correct answer: B
MgCl2
One magnesium ion requires two chloride ions to balance its charge.
Chemistry · Question 144
What characterises a covalent bond?
Sharing protons between nuclei
Loss of all neutrons
Attraction of two positive ions
Sharing electron pairs between atoms
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Correct answer: D
Sharing electron pairs between atoms
Covalent bonding involves shared electron density between atoms.
Chemistry · Question 145
In Zn -> Zn2+ + 2e-, zinc undergoes:
Oxidation
Precipitation
Reduction
Neutralisation
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Correct answer: A
Oxidation
Zinc loses electrons, which is oxidation.
Chemistry · Question 146
In a redox reaction, a reducing agent:
Never changes oxidation state
Accepts electrons and is reduced
Donates electrons and is oxidised
Must be oxygen
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Correct answer: C
Donates electrons and is oxidised
A reducing agent supplies electrons to another species and is itself oxidised.
Chemistry · Question 147
Which products form when aqueous HCl reacts completely with aqueous NaOH?
NaCl and water
Sodium metal and oxygen
Hydrogen and chlorine
Carbon dioxide and water
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Correct answer: A
NaCl and water
Acid-base neutralisation produces sodium chloride and water.
Physics · Question 148
A constant 15 N force moves an object 4 m in the force's direction. How much work does this force do?
11 J
19 J
60 J
3.75 J
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Correct answer: C
60 J
Work = force times displacement = 15 x 4 = 60 J.
Physics · Question 149
What is the kinetic energy of a 2 kg object moving at 3 m/s?
9 J
18 J
3 J
6 J
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Correct answer: A
9 J
Kinetic energy = one-half times mass times speed squared = 0.5 x 2 x 9 = 9 J.
Physics · Question 150
A motor does 360 J of work in 12 seconds. What is its average power?
4320 W
30 W
348 W
372 W
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Correct answer: B
30 W
Average power = work divided by time = 360 / 12 = 30 W.