Nursing Question Bank

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Chemistry · Question 321

At 25 degrees Celsius, the pH of a basic buffer is normally:

1. Less than 7
2. Greater than 7
3. Exactly 7 in every case
4. Always zero

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Correct answer: B

Greater than 7

A basic buffer maintains a pH above 7 at 25 degrees Celsius.

Chemistry · Question 322

For a zero-order reaction, which quantity does not affect the reaction rate?

1. Temperature
2. Presence of a catalyst
3. Reactant concentration
4. Activation energy

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Correct answer: C

Reactant concentration

The rate law for a zero-order reaction is rate = k, so the rate is independent of reactant concentration.

Chemistry · Question 323

Strong oxidation of p-xylene converts both methyl groups mainly into carboxyl groups, producing:

1. Benzoic acid
2. Phthalic acid
3. Terephthalic acid
4. Phenol

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Correct answer: C

Terephthalic acid

Oxidation of the two para methyl substituents of p-xylene produces benzene-1,4-dicarboxylic acid, or terephthalic acid.

Chemistry · Question 324

A Grignard reagent reacts with water to produce which type of organic compound?

1. Alcohol
2. Alkane
3. Aldehyde
4. Carboxylic acid

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Correct answer: B

Alkane

Water protonates the carbon bonded to magnesium, converting RMgX into the corresponding alkane RH.

Chemistry · Question 325

The stronger oxidising agent in a pair generally has the:

1. More negative standard reduction potential
2. Smaller atomic number
3. Lower electron affinity in every case
4. More positive standard reduction potential

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Correct answer: D

More positive standard reduction potential

A more positive standard reduction potential indicates a greater tendency to gain electrons and act as an oxidising agent.

Chemistry · Question 326

What is the oxidation state of manganese in KMnO4?

1. +2
2. +4
3. +6
4. +7

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Correct answer: D

+7

With K at +1 and four oxygens totalling -8, manganese must be +7 for the compound to be neutral.

Biology · Question 327

A packet-like cubic arrangement of eight cocci is called:

1. Streptococcus
2. Staphylococcus
3. Sarcina
4. Diplococcus

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Correct answer: C

Sarcina

Sarcinae divide in three perpendicular planes and characteristically form cubical packets of eight or more cells.

Biology · Question 328

Double fertilisation is a characteristic feature of:

1. Bryophytes
2. Angiosperms
3. Gymnosperms
4. Ferns

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Correct answer: B

Angiosperms

In angiosperms, one sperm fertilises the egg and another fuses with the polar nuclei to form endosperm.

Biology · Question 329

The Calvin cycle, commonly called the dark reaction of photosynthesis, occurs in the:

1. Thylakoid lumen
2. Grana
3. Chloroplast stroma
4. Mitochondrial matrix

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Correct answer: C

Chloroplast stroma

The enzymes of the Calvin cycle are located in the stroma of chloroplasts.

Biology · Question 330

Which hormone stimulates uterine contractions during labour?

1. Oxytocin
2. Insulin
3. Thyroxine
4. Glucagon

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Correct answer: A

Oxytocin

Oxytocin promotes rhythmic contraction of uterine smooth muscle during labour.