Gravitation
Q. Which of the following statements is true about geostationary satellites?
A.
They orbit the Earth in a polar orbit.
B.
They have a period equal to the Earth's rotation period.
C.
They are always in the same position relative to the Earth.
D.
Both b and c
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Solution
Geostationary satellites have a period equal to the Earth's rotation period and remain in the same position relative to the Earth.
Correct Answer: D — Both b and c
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Q. Which of the following statements is true about gravitational field lines?
A.
They are straight lines
B.
They can cross each other
C.
They point towards the mass
D.
They are always circular
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Solution
Gravitational field lines point towards the mass creating the field.
Correct Answer: C — They point towards the mass
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Q. Which of the following statements is true about gravitational potential energy?
A.
It is always positive.
B.
It can be negative.
C.
It is independent of position.
D.
It is always zero.
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Solution
Gravitational potential energy can be negative depending on the reference point chosen.
Correct Answer: B — It can be negative.
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Q. Which of the following statements is true for a satellite in a stable orbit?
A.
It requires continuous propulsion.
B.
It moves in a straight line.
C.
It is acted upon by gravitational force.
D.
It has zero velocity.
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Solution
A satellite in a stable orbit is acted upon by gravitational force, which provides the necessary centripetal force to keep it in orbit.
Correct Answer: C — It is acted upon by gravitational force.
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Q. Which of the following statements is true regarding gravitational force?
A.
It is a contact force
B.
It acts only on Earth
C.
It is always attractive
D.
It can be repulsive
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Solution
Gravitational force is always attractive, acting between any two masses.
Correct Answer: C — It is always attractive
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Q. Which of the following statements is true regarding gravitational potential energy?
A.
It is always positive
B.
It can be negative
C.
It is independent of height
D.
It is only defined for objects at rest
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Solution
Gravitational potential energy can be negative when an object is below a reference point, such as the Earth's surface.
Correct Answer: B — It can be negative
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Q. Which type of orbit allows a satellite to cover the entire surface of the Earth over time?
A.
Geostationary orbit
B.
Polar orbit
C.
Circular orbit
D.
Elliptical orbit
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Solution
A polar orbit allows a satellite to pass over the entire surface of the Earth as the Earth rotates beneath it.
Correct Answer: B — Polar orbit
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Q. Which type of orbit allows a satellite to cover the entire surface of the Earth?
A.
Geostationary orbit
B.
Polar orbit
C.
Elliptical orbit
D.
Circular orbit
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Solution
A polar orbit allows a satellite to pass over the entire surface of the Earth as the Earth rotates beneath it.
Correct Answer: B — Polar orbit
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Q. Which type of orbit allows a satellite to pass over the same point on the Earth's surface at the same local solar time every day?
A.
Polar orbit
B.
Geostationary orbit
C.
Sun-synchronous orbit
D.
Elliptical orbit
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Solution
A sun-synchronous orbit allows a satellite to pass over the same point on the Earth's surface at the same local solar time every day, as it is synchronized with the Earth's position relative to the Sun.
Correct Answer: C — Sun-synchronous orbit
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Q. Which type of satellite orbit is best for monitoring weather patterns?
A.
Geostationary orbit
B.
Polar orbit
C.
Elliptical orbit
D.
Low Earth orbit
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Solution
Geostationary satellites are ideal for monitoring weather patterns as they provide a constant view of the same area.
Correct Answer: A — Geostationary orbit
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Q. Which type of satellite orbit is best for weather monitoring?
A.
Geostationary orbit
B.
Polar orbit
C.
Elliptical orbit
D.
Low Earth orbit
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Solution
Geostationary orbits are ideal for weather monitoring as they provide a constant view of the same area of the Earth.
Correct Answer: A — Geostationary orbit
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