Quiz  /  Physics Class 9 MCQ Questions With Answers

  • 1. 
    The average speed between 4 and 16 seconds is?

  • 5.2 km/s
  • .192 m/s
  • .181 km/s
  • 5.5 km/s

  • 2. 
    In order to determine the emission spectra of an unknown gas, which of the following would be most helpful?

  • The emission spectra peer elements for comparison
  • Discharge tubes with different concentrations of the unknown
  • A periodic table indicating the groups of elements
  • A table showing the wavelengths of different colors

  • 3. 
    How many variables should be changed in an experiment?

  • 1
  • 2
  • 3
  • doesn't matter

  • 4. 
    A ball is rolled at a velocity of 12 m/sec. After 36 seconds, it comes to a stop. What is the acceleration of the ball?

  • 3 m/s/s
  • -3 m/s/s
  • .33 m/s/s
  • -.33 m/s/s

  • 5. 
    Two plastic cups are placed one inside the other. A small spacer keeps the two cups separated. Hot water is poured into the inner cup and a lid is put on top, as shown. Which statement is correct?

  • The bench is heated by convection from the bottom of the outer cup.
  • The lid reduces the energy lost by convection.
  • There is no thermal conduction through the sides of either cup.
  • Thermal radiation is prevented by the small air gap.

  • 6. 
    What is the name of the particles of light?

  • protons
  • photons
  • atomic particles
  • infrared

  • 7. 
    The SI unit for measuring heat is the

  • Pascal
  • Kelvin
  • Joule
  • Calorie

  • 8. 
    Which statement describes what happens as ice at 0°C starts to melt to become water?

  • Energy is absorbed and the temperature remains constant.
  • Energy is absorbed and the temperature rises.
  • Energy is released and the temperature remains constant.
  • Energy is released and the temperature rises.

  • 9. 
    Which graph shows an object going back to the start position?

  • A
  • B
  • C
  • D

  • 10. 
    Which graph shows an object increasing speed?

  • A
  • B
  • D
  • E

  • 11. 
    How do solar panels work?

  • Sun hits the solar panel and releases quarks
  • Light hits the solar panel and releases photons
  • Photons hit the solar panel and release electrons
  • Electrons jump energy levels and release photons

  • 12. 
    In nuclear fission, some mass is converted to energy. This causes -

  • final mass to be less than initial mass
  • final mas to be more than initial mass
  • final mass to be equal to initial mass

  • 13. 
    How does a star form?

  • Contraction of a large amount of gas into heavier element by way of nuclear fusion
  • Contraction of a large amount of gas into heavier element by way of nuclear fission
  • Expansion of large amount of gas by nuclear fission
  • Expansion of large amount of gas by nuclear fusion

  • 14. 
    Morgan walks 10 miles South. Trevor walks 10 miles North in the same amount of time. They have:

  • Different average speeds
  • Different velocities
  • Same velocity
  • Same motion

  • 15. 
    When electrons move from a high level to a low energy level, which of the following statements are correct?

  • Spectral lines are emitted
  • Mass is converted to energy
  • The photoelectric effect occurs
  • Quarks combine to create subatomic particle

  • 16. 
    A swimmer feels cold after leaving warm water on a warm, windy day. Why does she feel cold even though the air is warm?

  • The less energetic water molecules on her skin escape quickly.
  • The more energetic water molecules on her skin do not escape quickly.
  • The water on her skin does not evaporate quickly enough to keep her warm.
  • The water on her skin evaporates quickly and cools her skin.

  • 17. 
    Which graph shows an object slowing down?

  • A
  • B
  • C
  • E

  • 18. 
    What does the mass equivalence equation tell us? E=mc2

  • A large amount of energy can be converted from a small amount of mass
  • Gravity bends both time and space
  • Gravitational waves are emitted from black holes
  • Atomic nuclei emit gamma rays, beta particles, and alpha particles

  • 19. 
    Is light a particle or a wave? How do we know?

  • Both. Photoelectric effect and double slit experiment
  • Wave. Double slit experiment
  • Particle. Polarized lenses
  • Particle. Photoelectric effect.

  • 20. 
    When flying, some birds use warm air currents to gain height.What is the cause of these currents?

  • conduction
  • convection
  • evaporation
  • radiation

  • 21. 
    Evaporation occurs when molecules escape from a liquid surface into the air above it. During this process the temperature of the liquid falls. Why does the temperature of the liquid fall?

  • The molecules in the vapour expand because the pressure is less.
  • The molecules left in the liquid have more space to move around.
  • The molecules move more slowly when they escape into the air.
  • The molecules with the highest energies escape into the air.

  • 22. 
    D-Lo watches a red buggy car, which is his favorite activity. He watches the car cover 2 meters every second. Which graph would represent this?

  • A (upper left)
  • B (bottom left)
  • C (upper right)
  • D (bottom right)

  • 23. 
    Rank from slowest to fastest,

  • A B C
  • B C A
  • C A B
  • B A C

  • 24. 
    An experiment is set up to find out which metal is the best conductor of heat. Balls are stuck with wax to rods made from different metals, as shown in diagram 1. The rods are heated at one end. Some of the balls fall off, leaving some as shown in diagram 2. Which labelled metal is the best conductor of heat?

  • A
  • B
  • C
  • D

  • 25. 
    The diagram shows a beaker of water. Four molecules are labelled. The relative amount of energy of each molecule is shown. Which molecule is most likely to escape from the liquid?

  • A
  • B
  • C
  • D

  • 26. 
    A car starts from a stoplight and is traveling with a velocity of 10 m/sec east in 20 seconds. What is the acceleration of the car?

  • .5 m/s/s
  • .5 m/s
  • 2 m/s/s
  • 2 m/s

  • 27. 
    The diagram shows electricity cables being put up on a warm day. The cables are left loose between the poles, as shown in the diagram. Why are the cables left loose?

  • They will contract on cold days.
  • They will contract on very warm days.
  • They will expand on cold days.
  • They will expand on very warm days.

  • 28. 
    Under the standard model, what are protons and neutrons composed of?

  • electrons
  • quarks
  • atoms
  • neutrons
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