Lesson 5.5.3
5.5.3 Cosmology Quiz: OCR Physics, Unit 4
20 questions
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Lesson 5.5.3, Cosmology: 20 multiple choice questions for the OCR Physics (H156), Unit 4: Newtonian world and astrophysics, written with Revision Ninja.
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The 20 questions
-
What distance is defined as the mean radius of the Earth's orbit around the Sun?
- Parsec
- Arcsecond
- Astronomical Unit
- Light-year
-
What distance corresponds to a parallax angle of one arcsecond?
- One astronomical unit
- One mega-year
- One light-year
- One parsec
-
A star has a parallax angle of 0.25 arcseconds. What is its distance in parsecs?
- 2.5 pc
- 0.25 pc
- 0.4 pc
- 4 pc
-
Which term describes the universe having a uniform density of matter on a large scale?
- Isotropic
- Universal
- Homogeneous
- Anisotropic
-
Which term describes the universe looking identical in every direction to an observer?
- Isothermal
- Homogeneous
- Isotropic
- Continuous
-
According to the Cosmological Principle, how do physical laws behave across the universe?
- They depend on density
- They vary with location
- They are universal
- They change over time
-
What happens to observed light wavelengths when a galaxy moves away from Earth?
- Wavelength increases
- Wavelength decreases
- Frequency increases
- Speed increases
-
In the Doppler equation, what does the ratio delta lambda over lambda represent?
- Absolute speed
- Fractional change
- Distance shifted
- Hubble constant
-
Which law states that galaxy recession speed is proportional to distance from Earth?
- Hubble's law
- Stefan's law
- Wien's law
- Kepler's law
-
What is the base SI unit for the Hubble constant?
- s^-1
- m s^-1
- km s^-1
- Mpc^-1
-
A galaxy recedes at 1400 km s^-1. Given H0 is 70 km s^-1 Mpc^-1, find its distance.
- 98000 Mpc
- 0.05 Mpc
- 200 Mpc
- 20 Mpc
-
What radiation provides key experimental evidence for the Big Bang theory?
- Cosmic gamma background
- Cosmic X-ray background
- Cosmic microwave background
- Cosmic infrared background
-
What is the current approximate peak temperature of the cosmic microwave background radiation?
- 0 K
- 273 K
- 27 K
- 2.7 K
-
How can the approximate age of the universe be calculated using the Hubble constant?
- H0 / c
- H0^2
- c / H0
- 1 / H0
-
What is actually expanding according to the modern Big Bang model?
- Galactic matter only
- Space-time itself
- Speed of light
- Solar systems
-
What constituent is believed to be responsible for the accelerating expansion of the universe?
- Antimatter
- Ordinary matter
- Dark matter
- Dark energy
-
What invisible component makes up most of the mass within galaxies?
- Dark energy
- Dark matter
- Antimatter
- Interstellar dust
-
Approximately what percentage of the universe is made up of ordinary matter?
- 25%
- 5%
- 50%
- 95%
-
Why is stellar parallax unsuitable for measuring distances to very distant galaxies?
- Angle too small
- Light absorbed
- Angle too large
- No motion
-
Light of wavelength 600 nm from a star is redshifted by 0.6 nm. What is its speed?
- 30 km s^-1
- 3000 km s^-1
- 180 km s^-1
- 300 km s^-1
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