Lesson 5.4.4
5.4.4 Gravitational potential and energy Quiz: OCR Physics, Unit 4
20 questions
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Lesson 5.4.4, Gravitational potential and energy: 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 is defined as work done per unit mass bringing a small mass from infinity?
- Gravitational force
- Gravitational potential energy
- Gravitational field strength
- Gravitational potential
-
What is the value of gravitational potential at an infinite distance from a mass?
- Negative infinity
- Zero
- Infinite
- One
-
Why is gravitational potential around an isolated mass always a negative value?
- Attractive force
- Zero work done
- Repulsive force
- Loss of mass
-
What is the unit of measurement for gravitational potential in SI units?
- J kg⁻¹
- J kg
- J m⁻¹
- N kg⁻¹
-
Which equation represents the gravitational potential Vg at distance r from mass M?
- GM / r²
- -GM / r
- -GM / r²
- -GMm / r
-
What physical quantity is represented by the area under a gravitational force-distance graph?
- Acceleration
- Field strength
- Work done
- Gravitational potential
-
What is the formula for the gravitational potential energy Ep of two point masses?
- -GM / r
- -GMm / r
- GMm / r²
- -GMm / r²
-
What velocity must an object reach to escape a planet's gravitational field completely?
- Escape velocity
- Critical velocity
- Orbital velocity
- Terminal velocity
-
Which formula gives the escape velocity v from the surface of a planet of mass M?
- √(2GM / r)
- √(GM / r)
- √(GM / r²)
- 2GM / r
-
What is the orbital period of a satellite in a geostationary orbit around Earth?
- 365 days
- 90 minutes
- 12 hours
- 24 hours
-
Above which region of the Earth must a geostationary satellite always be positioned?
- South pole
- North pole
- The equator
- Prime meridian
-
According to Kepler's third law, how does orbital period T relate to radius r?
- T ∝ r²
- T² ∝ r³
- T² ∝ r
- T³ ∝ r²
-
What outward pressures balance gravitational collapse in a stable main sequence star?
- Radiation and gas
- Neutron degeneracy
- Electron degeneracy
- Magnetic field
-
What quantum effect prevents a white dwarf star from collapsing under gravity?
- Gas expansion pressure
- Electron degeneracy pressure
- Thermal radiation pressure
- Neutron degeneracy pressure
-
What is the maximum mass of a white dwarf star known as?
- Hawking limit
- Chandrasekhar limit
- Hubble limit
- Schwarzschild limit
-
What stellar remnant forms when a core above the Chandrasekhar limit collapses completely?
- White dwarf
- Red giant
- Protostar
- Neutron star
-
What two variables are plotted against each other on a Hertzsprung-Russell diagram?
- Luminosity and temperature
- Luminosity and mass
- Temperature and density
- Mass and radius
-
Why are electron energy levels in isolated atoms given negative values?
- Electrons are bound
- Energy is created
- Atoms lose charge
- Electrons are positive
-
What occurs when an electron transitions to a lower energy level in an atom?
- Photon absorption
- Proton emission
- Electron decay
- Photon emission
-
If a planet's radius quadruples while mass remains constant, how does escape velocity change?
- Doubled
- Quartered
- Halved
- Unchanged
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