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IRCON Engineer Physics — practice by topic

Browse 30 questions across 3 Physics topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Engineering Entrance (30)Fluid Mechanics (30)Physics (30)

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Density is defined as the mass of a substance divided by its:Read the answer and worked solution →Ice forms at the top of a pond because water reaches its greatest density:Read the answer and worked solution →A substance whose density is the same throughout is described as:Read the answer and worked solution →A substance whose density varies from place to place is described as:Read the answer and worked solution →

Worked practice questions

Density is defined as the mass of a substance divided by its:

  1. Volume
  2. Voltage
  3. Velocity
  4. Viscosity
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Correct answer: A. Volume

1. Density compares how much matter fills a space. 2. Mass is divided by the space it occupies. 3. So it is divided by volume. _Source: OpenStax University Physics Volume 1, Chapter 14, Fluid Mechanics._

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Ice forms at the top of a pond because water reaches its greatest density:

  1. While boiling
  2. Above freezing
  3. Below freezing
  4. At boiling
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Correct answer: B. Above freezing

1. Water is unusual among liquids. 2. It is densest a few degrees before it freezes. 3. So the greatest density is above freezing. _Source: OpenStax University Physics Volume 1, Chapter 14, Fluid Mechanics._

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A substance whose density is the same throughout is described as:

  1. Homogeneous
  2. Heterogeneous
  3. Hydrostatic
  4. Hyperbolic
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Correct answer: A. Homogeneous

1. Every sample would give the same reading. 2. Nothing varies from place to place. 3. So the substance is homogeneous. _Source: OpenStax University Physics Volume 1, Chapter 14, Fluid Mechanics._

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