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Nursing Question Bank

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1265 available questions

Chemistry · Question 281

Which gas is most abundant in dry Earth air?

  1. Argon
  2. Carbon dioxide
  3. Oxygen
  4. Nitrogen
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Correct answer: D

Nitrogen

Nitrogen comprises approximately 78 percent of dry air by volume.

Chemistry · Question 282

Which of these is a halogen?

  1. Sulphur
  2. Chlorine
  3. Sodium
  4. Neon
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Correct answer: B

Chlorine

Chlorine is a group 17 element, the halogens.

Chemistry · Question 283

The bond between the two nitrogen atoms in N2 is:

  1. A double bond
  2. A triple bond
  3. A single bond
  4. An ionic bond
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Correct answer: B

A triple bond

The two nitrogen atoms in N2 share three electron pairs, forming a triple bond.

Chemistry · Question 284

The electronic configuration of sodium (Z = 11) is:

  1. 2, 8, 2
  2. 2, 8, 8
  3. 2, 7, 2
  4. 2, 8, 1
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Correct answer: D

2, 8, 1

The 11 electrons of neutral sodium occupy shells as 2, 8, 1.

Chemistry · Question 285

For a fixed amount of gas, Charles law states that at constant pressure:

  1. Volume is directly proportional to absolute temperature
  2. Volume is constant
  3. Volume is inversely proportional to temperature
  4. Pressure is proportional to volume
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Correct answer: A

Volume is directly proportional to absolute temperature

For a fixed amount of gas at constant pressure, volume is proportional to absolute temperature.

Chemistry · Question 286

Which of these is a strong acid?

  1. H2CO3
  2. HCl
  3. CH3COOH
  4. HCN
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Correct answer: B

HCl

Hydrochloric acid is a strong acid because it essentially fully ionises in dilute aqueous solution.

Chemistry · Question 287

Which of these is an allotrope of carbon?

  1. Quartz
  2. Silica
  3. Diamond
  4. Brass
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Correct answer: C

Diamond

Diamond is a crystalline allotrope of carbon.

Chemistry · Question 288

The chemical formula of glucose is:

  1. C2H5OH
  2. CH4
  3. C12H22O11
  4. C6H12O6
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Correct answer: D

C6H12O6

Glucose has molecular formula C6H12O6.

Physics · Question 289

The SI unit of pressure is:

  1. Pascal
  2. Joule
  3. Hertz
  4. Newton
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Correct answer: A

Pascal

The pascal is the SI unit of pressure and equals one newton per square metre.

Physics · Question 290

The SI unit of frequency is:

  1. Pascal
  2. Watt
  3. Hertz
  4. Tesla
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Correct answer: C

Hertz

Frequency is measured in hertz, equivalent to cycles per second.