Class VII Physics Unit 1 Quiz
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Questions and Answers

What is the space occupied by an object called?

  • Density
  • Acceleration
  • Area
  • Volume (correct)

    • What is the speed of a boy who travels a distance of 150m in 1 minute?

  • 9 m/s
  • 2.5 m/s (correct)
  • 150 m/s
  • 25 m/s

    • What is the area of a piece of paper with dimensions 1.5 m x 20 cm?

  • 30 m²
  • 300 cm²
  • 0.3 m² (correct)
  • 3000 m³

    • What is the density of alcohol in SI units if its density is 0.8 g/cm³?

    <p>800 kg/m³</p> Signup and view all the answers

    Which unit is commonly used in astronomy to measure great distances between stars?

    <p>Light year</p> Signup and view all the answers

    Which of the following is considered a fundamental quantity in mechanics?

    <p>Length, mass, time</p> Signup and view all the answers

    Which of the following is a derived unit?

    <p>Metre³</p> Signup and view all the answers

    What does the MKS system of units stand for?

    <p>Metre, kilogram, second</p> Signup and view all the answers

    What is the formula for calculating the volume of a rectangular object?

    <p>Volume = length x width x height</p> Signup and view all the answers

    What is the density of a platinum bar if its mass is 700 grams and its volume is 18 cm³?

    <p>38.89 g/cm³</p> Signup and view all the answers

    What method can be used to measure the volume of an irregular object?

    <p>Displacement method using a measuring cylinder</p> Signup and view all the answers

    How much volume does 1 milliliter (ml) correspond to in cubic centimeters (cm³)?

    <p>1 cm³</p> Signup and view all the answers

    If the volume of a liquid in a container with dimensions 10 cm x 20 cm x 6 cm is calculated, what is it?

    <p>1200 cm³</p> Signup and view all the answers

    What is the SI unit for density?

    <p>kg/m³</p> Signup and view all the answers

    What will be the weight of an 80 kg man on Jupiter, considering its gravity is 2.5 times that of Earth's?

    <p>1960 N</p> Signup and view all the answers

    If the density of copper is 8.9 g/cm³, what is its density in kg/m³?

    <p>8900 kg/m³</p> Signup and view all the answers

    Which type of plastic will float in both engine oil and water?

    <p>Polyethylene</p> Signup and view all the answers

    Which type of plastic will sink in engine oil but float in water?

    <p>Polypropylene</p> Signup and view all the answers

    Which type of plastic will sink in both engine oil and water?

    <p>Cellulose acetate</p> Signup and view all the answers

    What is the SI unit of density?

    <p>kg/m³</p> Signup and view all the answers

    Why do hydrogen bubbles float when introduced to soap water?

    <p>Hydrogen is lighter than soap water</p> Signup and view all the answers

    Why is the weight of the same object different on different planets?

    <p>Acceleration due to gravity varies</p> Signup and view all the answers

    Which of the following statements regarding cork is true?

    <p>Cork floats on water</p> Signup and view all the answers

    What is the volume of a cylinder with a radius of 7 cm and a height of 4 cm?

    <p>616 cm³</p> Signup and view all the answers

    What distinguishes mass from weight?

    <p>Mass is the amount of matter while weight is the force of gravity acting on that mass.</p> Signup and view all the answers

    If you convert 0.25 meters to centimeters, what is the result?

    <p>25 cm</p> Signup and view all the answers

    What is the area of a circle with a radius of 7 meters?

    <p>$154 m^2$</p> Signup and view all the answers

    How do you calculate the volume of a cube with a side length of 6 cm?

    <p>$216 cm^3$</p> Signup and view all the answers

    Why is liquid iron less dense than solid iron of the same mass?

    <p>Liquid iron occupies a greater volume than solid iron.</p> Signup and view all the answers

    What is the density of an object that has a volume of 8 and a mass of 84 kg?

    <p>10.5 kg/m³</p> Signup and view all the answers

    What happens to objects with densities lower than that of a liquid?

    <p>They float on the liquid.</p> Signup and view all the answers

    What is the formula for the volume of a sphere with radius 'r'?

    <p>$ rac{4}{3} ext{π} r^3$</p> Signup and view all the answers

    Study Notes

    Physical Quantities and Measurements

    • Space occupied by an object is referred to as Volume.
    • Speed can be calculated by Distance / Time; example, traveling 150m in 1min results in a speed of 2.5 m/s.
    • Area of a rectangle is calculated using Length x Width; for a paper of 1.5 m x 20 cm, the area equals 300 cm² or 0.3 m².
    • Density measures mass per unit volume; density of alcohol 0.8 g/cm³ translates to 800 kg/m³ in SI units.
    • In astronomy, distances between stars are measured in Parsecs, Astronomical Units, or Light years.
    • Fundamental quantities in mechanics are Length, Mass, and Time.
    • Derived units include measurements such as Metre³ and not basic units like Metre or Kelvin.
    • Litre is not considered an SI unit, while Metre, Second, and Kilogram are SI units.
    • To find the mass of a wooden block with a density of 0.8 g/cm³ and volume 60 cm³: Mass = Density x Volume = 48 g.
    • MKS system represents units of Metre, Kilogram, and Second.

    Unit Review

    • Formula for Volume of a cube is s³, where 's' is the side length.
    • Density (D) is calculated by the formula D = Mass/Volume.
    • Density and volume computations can be practiced using object measurements.
    • To measure the volume of an irregular object, water displacement method is used: difference in water levels before and after submerging gives the volume.
    • Density is defined as mass per unit volume; SI unit is kg/m³.
    • Volume of liquid in the container given dimensions can be calculated as Length x Width x Height.
    • Converting g/cm³ to kg/m³ involves multiplying by 1000 for correct SI unit representation.
    • Weight on different planets varies depending on gravitational pull; Weight = Mass x g.

    Key Concepts

    • Mass refers to the quantity of matter, while weight is the force of gravity acting on that mass.
    • To convert 0.25 m to cm, multiply by 100; to convert 25 cm to km, divide by 100,000.
    • Area of a square is calculated from the side length; for an area of 64 cm², the side is 8 cm.
    • Area of circle is found using the formula πr²; for radius 7 m, area is approximately 154 m².
    • To measure the volume of a cube, use s³; for side 6 cm, volume calculates to 216 cm³.
    • Volume of a sphere can be calculated using the formula (4/3)πr³; for radius 5 cm, volume is 523.33 cm³.

    Real-Life Applications

    • Density plays a key role in objects floating or sinking; lower density substances float.
    • Examples include swimming, buoyancy in boats, and hot air balloons, which depend on density differences.
    • Hydrogen bubbles float due to lower density compared to soap water.
    • Weight differences across planets can be explained by variations in gravitational acceleration.

    Additional Points

    • Objects with densities lower than that of a liquid will float, while those with higher densities will sink.
    • Knowledge of densities helps predict behavior of materials in different environments, emphasizing the importance of understanding physical properties in science.

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    Description

    Test your knowledge on physical quantities and measurements in this quiz designed for Class VII students. Questions cover concepts such as volume, speed, and basic definitions in physics. Enhance your understanding of these fundamental topics before your next exam!

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