Explore Multiple-Choice Questions (MCQs) on Shape of Earth and Gravitation for AISSEE Class 6. Get detailed explanations of answers covering gravity, planetary motion, weight, mass, and more. Perfect study material and notes for Sainik School Entrance Exam preparation.
Shape of Earth and Gravitation – MCQs for All India Sainik Schools Entrance Examination (AISSEE) Class 6
1. What is the shape of the Earth?
A) Flat
B) Square
C) oblate spheroid
D) Triangular
Answer: C) oblate spheroid
Explanation: The Earth appears round, but it is actually an oblate spheroid—slightly flattened at the poles and bulging at the equator due to rotation.
2. Who first proposed that the Earth is spherical?
A) Galileo
B) Aristotle
C) Newton
D) Copernicus
Answer: B) Aristotle
Explanation: Aristotle, an ancient Greek philosopher, provided evidence of Earth’s spherical shape based on observations of lunar eclipses and ship movements on the horizon.
3. Why don’t we feel the Earth’s motion?
A) Earth is not moving
B) Earth’s motion is too slow to be felt
C) Earth’s motion is uniform
D) The sky holds Earth still
Answer: C) Earth’s motion is uniform
Explanation: Earth rotates at a constant speed, and we move along with it, so we do not feel its motion.
4. The force that pulls objects toward the center of the Earth is called?
A) Magnetism
B) Electricity
C) Gravitation
D) Friction
Answer: C) Gravitation
Explanation: Gravity is the force of attraction exerted by Earth on all objects, pulling them toward its center.
5. Who discovered the law of gravitation?
A) Galileo
B) Newton
C) Kepler
D) Einstein
Answer: B) Newton
Explanation: Sir Isaac Newton formulated the Universal Law of Gravitation, explaining that every object attracts every other object in the universe.
6. What causes objects to fall towards the ground when dropped?
A) Air resistance
B) Magnetic force
C) Gravity
D) Friction
Answer: C) Gravity
Explanation: Gravity is the force that pulls objects toward the Earth’s center, making them fall when dropped.
7. The weight of an object is the force of _____ acting on it.
A) Air resistance
B) Gravity
C) Magnetism
D) Friction
Answer: B) Gravity
Explanation: Weight is the gravitational force exerted by the Earth on an object.
8. What is the approximate shape of the Earth?
A) Cube
B) Perfect Sphere
C) Oblate Spheroid
D) Pyramid
Answer: C) Oblate Spheroid
Explanation: The Earth is slightly flattened at the poles and bulging at the equator due to its rotation.
9. What happens to the gravitational force as we go higher from the Earth’s surface?
A) Increases
B) Decreases
C) Remains constant
D) First increases then decreases
Answer: B) Decreases
Explanation: Gravitational force decreases with an increase in height above the Earth’s surface.
10. Who was the first person to prove that objects fall at the same rate regardless of their mass?
A) Galileo
B) Newton
C) Einstein
D) Copernicus
Answer: A) Galileo
Explanation: Galileo conducted experiments by dropping objects from the Leaning Tower of Pisa, proving that objects fall at the same rate in the absence of air resistance.
11. What keeps the Moon in orbit around the Earth?
A) Earth’s gravity
B) Sun’s heat
C) Magnetic force
D) Air pressure
Answer: A) Earth’s gravity
Explanation: The Moon stays in orbit due to the gravitational pull of the Earth, which keeps it from flying off into space.
12. If there were no gravity, what would happen to objects on Earth?
A) They would remain still
B) They would float away into space
C) They would become heavier
D) They would sink into the ground
Answer: B) They would float away into space
Explanation: Gravity holds everything on Earth, so without it, objects and even people would float away into space.
13. The force of gravity between two objects depends on their _____.
A) Mass and distance
B) Shape and size
C) Temperature and speed
D) Color and texture
Answer: A) Mass and distance
Explanation: Newton’s Law of Universal Gravitation states that gravity depends on the mass of the objects and the distance between them.
14. Which of the following is NOT an effect of gravity?
A) Keeping planets in orbit
B) Holding the atmosphere in place
C) Making objects fall
D) Producing light
Answer: D) Producing light
Explanation: Gravity affects motion and structure but does not produce light, which is generated by energy sources like the Sun.
15. Where is the force of gravity the strongest?
A) At the equator
B) At the center of the Earth
C) At the poles
D) In space
Answer: C) At the poles
Explanation: Due to Earth’s oblate shape, gravity is slightly stronger at the poles than at the equator.
16. Which scientist formulated the Universal Law of Gravitation?
A) Galileo Galilei
B) Isaac Newton
C) Albert Einstein
D) Johannes Kepler
Answer: B) Isaac Newton
Explanation: Sir Isaac Newton proposed the Universal Law of Gravitation, stating that every object in the universe attracts every other object with a force proportional to their masses and inversely proportional to the square of the distance between them.
17. What happens to your weight if you travel to the Moon?
A) Increases
B) Decreases
C) Remains the same
D) Becomes zero
Answer: B) Decreases
Explanation: The Moon’s gravity is one-sixth of Earth’s gravity, so you would weigh much less on the Moon.
18. What is the SI unit of force, including gravitational force?
A) Kilogram
B) Newton
C) Joule
D) Meter
Answer: B) Newton
Explanation: Force, including gravitational force, is measured in Newtons (N), named after Sir Isaac Newton.
19. If two objects have more mass, what happens to the gravitational force between them?
A) Increases
B) Decreases
C) Remains the same
D) Becomes zero
Answer: A) Increases
Explanation: According to Newton’s Law of Gravitation, the force increases with greater mass.
20. Which force prevents us from floating away into space?
A) Magnetic force
B) Electrostatic force
C) Gravitational force
D) Frictional force
Answer: C) Gravitational force
Explanation: The gravitational pull of Earth keeps us grounded and prevents us from floating into space or air.
21. Why do astronauts appear weightless in space?
A) There is no gravity in space
B) The spaceship moves too fast
C) They are in a state of free fall
D) Space repels gravity
Answer: C) They are in a state of free fall
Explanation: Astronauts in orbit experience free fall, meaning they are constantly falling toward Earth but also moving forward, creating a sensation of weightlessness.
22. What keeps the Earth moving around the Sun?
A) The Sun’s heat
B) The Moon’s pull
C) The Sun’s gravitational force
D) The Earth’s speed
Answer: C) The Sun’s gravitational force
Explanation: The gravitational force of the Sun pulls Earth, keeping it in its orbit.
23. If Earth’s gravity suddenly disappeared, what would happen to the Moon?
A) It would crash into Earth
B) It would move in a straight line into space
C) It would remain in the same orbit
D) It would stop moving
Answer: B) It would move in a straight line into space
Explanation: Without gravity, the Moon would no longer be pulled toward Earth and would travel in a straight line due to inertia.
24. Why does a feather fall slower than a stone on Earth?
A) Because gravity is weaker on the feather
B) Because air resistance slows it down
C) Because the feather has less mass
D) Because the stone is magnetic
Answer: B) Because air resistance slows it down
Explanation: In the presence of air, air resistance slows down light objects like feathers. In a vacuum, both fall at the same rate.
25. How does gravity help us in everyday life?
A) It keeps our feet on the ground
B) It keeps water in lakes and rivers
C) It helps in the motion of planets
D) All of the above
Answer: D) All of the above
Explanation: Gravity plays a crucial role in keeping us on the ground, holding water bodies, and maintaining planetary motion.
26. What happens to an object’s weight as it moves away from the Earth’s surface?
A) Increases
B) Decreases
C) Remains the same
D) First increases, then decreases
Answer: B) Decreases
Explanation: The force of gravity weakens as distance from Earth increases, reducing an object’s weight.
27. Which celestial body exerts the strongest gravitational pull in our solar system?
A) Earth
B) Moon
C) Sun
D) Jupiter
Answer: C) Sun
Explanation: The Sun is the most massive object in our solar system, so it has the strongest gravitational pull.
28. Why does the Earth appear slightly flattened at the poles?
A) Due to earthquakes
B) Due to winds
C) Due to its rotation
D) Due to ocean currents
Answer: C) Due to its rotation
Explanation: The Earth’s rotation causes it to bulge at the equator and flatten at the poles, making it an oblate spheroid.
29. Why do we weigh more on Earth than on the Moon?
A) The Moon has more mass than Earth
B) The Moon has less gravity than Earth
C) Earth repels the Moon’s gravity
D) The Moon has a thicker atmosphere
Answer: B) The Moon has less gravity than Earth
Explanation: The Moon’s gravity is about 1/6th of Earth’s gravity, so objects weigh less on the Moon.
30. Which force is responsible for keeping satellites in orbit around Earth?
A) Magnetic force
B) Electrostatic force
C) Gravitational force
D) Nuclear force
Answer: C) Gravitational force
Explanation: Earth’s gravity keeps artificial and natural satellites in orbit.
31. What will happen if an object is thrown upwards?
A) It will keep moving up forever
B) It will stop and fall back
C) It will disappear into space
D) It will move in a circular path
Answer: B) It will stop and fall back
Explanation: Gravity pulls objects back to Earth once they lose upward force.
32. Where is the gravitational pull of the Earth the weakest?
A) At the equator
B) At the poles
C) In deep oceans
D) On mountains
Answer: A) At the equator
Explanation: Due to the Earth’s bulging shape, gravity is slightly weaker at the equator than at the poles.
33. What would happen if the Earth’s gravity disappeared suddenly?
A) People would become heavier
B) All objects would fall to the ground
C) Everything would float away into space
D) The Sun’s gravity would increase
Answer: C) Everything would float away into space
Explanation: Without gravity, objects would no longer be held to Earth and would drift into space.
34. Which of these is NOT affected by gravity?
A) Movement of planets
B) Weight of an object
C) Direction of wind
D) Falling of an apple
Answer: C) Direction of wind
Explanation: Gravity influences planets, weight, and falling objects but wind direction depends on air pressure and temperature.
35. What is the difference between mass and weight?
A) Mass changes, weight remains the same
B) Weight is the gravitational force on an object, mass is the amount of matter
C) Mass depends on gravity, weight does not
D) There is no difference
Answer: B) Weight is the gravitational force on an object, mass is the amount of matter
Explanation: Mass remains constant, while weight depends on gravity, which varies with location.
36. What causes the tides in the ocean?
A) Wind force
B) Earth’s rotation
C) Sun’s radiation
D) Moon’s gravitational pull
Answer: D) Moon’s gravitational pull
Explanation: The gravitational pull of the Moon causes ocean tides, with the Sun also contributing to their strength.
37. Why does an astronaut jump higher on the Moon than on Earth?
A) Moon has no atmosphere
B) Moon’s gravity is weaker
C) Astronauts wear special boots
D) The Moon repels objects
Answer: B) Moon’s gravity is weaker
Explanation: The Moon’s gravity is 1/6th of Earth’s gravity, allowing astronauts to jump higher.
38. If an object’s mass increases, what happens to its weight on Earth?
A) It decreases
B) It increases
C) It remains the same
D) It becomes zero
Answer: B) It increases
Explanation: Weight depends on mass and gravity, so an increase in mass results in a greater weight.
39. Which planet has the strongest gravity in the solar system?
A) Earth
B) Mars
C) Jupiter
D) Venus
Answer: C) Jupiter
Explanation: Jupiter is the most massive planet, so it has the strongest gravitational pull.
40. What keeps the Earth’s atmosphere in place?
A) The Sun’s energy
B) The Moon’s pull
C) Earth’s gravity
D) Earth’s rotation
Answer: C) Earth’s gravity
Explanation: Gravity holds the atmosphere, preventing gases from escaping into space.
41. What happens when a spacecraft moves far from Earth?
A) Its weight decreases
B) Its weight increases
C) Its weight remains constant
D) It falls back to Earth
Answer: A) Its weight decreases
Explanation: As distance from Earth increases, gravity weakens, causing weight to decrease.
42. Why do skydivers fall toward the ground?
A) Due to wind resistance
B) Due to gravity
C) Due to air pushing them down
D) Due to their weight
Answer: B) Due to gravity
Explanation: Gravity pulls the skydiver toward Earth, and air resistance slows the fall.
43. Which of these statements is true about gravity?
A) It only exists on Earth
B) It is strongest in space
C) It acts between all objects with mass
D) It does not affect liquids
Answer: C) It acts between all objects with mass
Explanation: Gravity is a universal force that acts between any two objects with mass, no matter how small or large.
44. What will happen if an apple is thrown up into the air?
A) It will keep going up forever
B) It will float in the air
C) It will eventually stop and fall back
D) It will disappear
Answer: C) It will eventually stop and fall back
Explanation: Gravity pulls objects back to Earth once they lose upward force.
45. What force prevents us from floating when we walk?
A) Magnetic force
B) Gravitational force
C) Electrical force
D) Frictional force
Answer: B) Gravitational force
Explanation: Gravity holds us to the ground, keeping us from floating away.
46. What happens to the speed of a falling object due to gravity?
A) It decreases
B) It increases
C) It remains the same
D) It stops in mid-air
Answer: B) It increases
Explanation: Gravity accelerates falling objects, increasing their speed as they descend.
47. Which of the following is true about an object in free fall?
A) It moves upward due to gravity
B) It experiences only the force of gravity
C) It has no mass
D) It moves slower over time
Answer: B) It experiences only the force of gravity
Explanation: In free fall, gravity is the only force acting on the object, causing it to accelerate downward.
48. If an object’s mass is doubled, what happens to its weight?
A) It remains the same
B) It is doubled
C) It is halved
D) It becomes zero
Answer: B) It is doubled
Explanation: Weight = Mass × Gravity, so doubling the mass results in double the weight.
49. Where will an object weigh the most?
A) On Earth
B) On the Moon
C) In space
D) On Mars
Answer: A) On Earth
Explanation: Earth has greater gravity than the Moon, Mars, or space, so objects weigh the most here.
50. What causes a ball to eventually stop rolling on the ground?
A) Gravity
B) Magnetism
C) Friction
D) Inertia
Answer: C) Friction
Explanation: Friction between the ball and the ground slows it down and stops it.
51. How does the weight of an object change on different planets?
A) It remains constant everywhere
B) It depends on the planet’s gravity
C) It increases in space
D) It is always zero on other planets
Answer: B) It depends on the planet’s gravity
Explanation: Weight depends on gravity, which varies from planet to planet.
52. If there were no gravity, what would happen to objects in motion?
A) They would stop moving
B) They would move in a straight line forever
C) They would move in circles
D) They would float in one place
Answer: B) They would move in a straight line forever
Explanation: Without gravity, objects in motion continue moving in a straight line unless acted upon by another force.
53. Which force is responsible for the formation of planets and stars?
A) Electromagnetic force
B) Nuclear force
C) Gravitational force
D) Frictional force
Answer: C) Gravitational force
Explanation: Gravity pulls matter together, forming planets, stars, and galaxies.
54. What is weightlessness?
A) The absence of gravity
B) The experience of zero net force
C) The reduction of mass
D) The disappearance of air pressure
Answer: B) The experience of zero net force
Explanation: Weightlessness occurs when an object is in free fall, experiencing no contact force.
55. If gravity suddenly disappeared, what would happen to water in oceans and rivers?
A) It would remain in place
B) It would float into space
C) It would freeze instantly
D) It would evaporate
Answer: B) It would float into space
Explanation: Without gravity, there would be no force holding water to Earth, so it would drift into space.
56. What keeps Earth’s Moon from floating away into space?
A) The Sun’s gravity
B) The Earth’s gravity
C) The Moon’s own gravity
D) The pull of other planets
Answer: B) The Earth’s gravity
Explanation: The Moon is held in orbit around Earth due to Earth’s gravitational pull.
57. What happens to the force of gravity as the distance between two objects increases?
A) It increases
B) It decreases
C) It remains the same
D) It becomes zero
Answer: B) It decreases
Explanation: Gravity weakens as distance increases, as per Newton’s Law of Gravitation.
58. If an object falls freely from a height, what remains constant?
A) Speed
B) Weight
C) Acceleration due to gravity
D) Force acting on it
Answer: C) Acceleration due to gravity
Explanation: Free-falling objects experience constant gravitational acceleration (9.8 m/s² on Earth).
59. What would happen if the Sun’s gravity suddenly disappeared?
A) Planets would move in straight lines
B) Planets would stop moving
C) Planets would crash into each other
D) The solar system would shrink
Answer: A) Planets would move in straight lines
Explanation: Without the Sun’s gravity, planets would move in straight lines instead of orbiting.
60. Which of the following experiences the weakest gravity?
A) The Earth
B) The Moon
C) The Sun
D) A spacecraft in deep space
Answer: D) A spacecraft in deep space
Explanation: Gravity is weakest in deep space, far from any massive objects.
61. What happens to astronauts’ bodies in space due to low gravity?
A) They become heavier
B) They grow shorter
C) Their muscles and bones weaken
D) They stop breathing
Answer: C) Their muscles and bones weaken
Explanation: In low gravity, muscles and bones weaken because they don’t bear weight like on Earth.
62. Which force causes raindrops to fall toward the ground?
A) Wind force
B) Gravity
C) Air pressure
D) Friction
Answer: B) Gravity
Explanation: Gravity pulls raindrops toward Earth, causing them to fall.
63. What happens to an object’s mass when taken to the Moon?
A) It decreases
B) It increases
C) It remains the same
D) It becomes zero
Answer: C) It remains the same
Explanation: Mass is constant everywhere; only weight changes due to gravity.
64. Why do objects on the Moon fall more slowly than on Earth?
A) The Moon has no air
B) The Moon has less gravity
C) The Moon is farther from the Sun
D) The Moon repels objects
Answer: B) The Moon has less gravity
Explanation: The Moon’s gravity is weaker than Earth’s, making objects fall more slowly.
65. Which two factors determine the strength of gravity between two objects?
A) Temperature and volume
B) Mass and distance
C) Speed and shape
D) Color and texture
Answer: B) Mass and distance
Explanation: Gravity increases with mass and decreases with distance between objects.
66. What keeps the planets moving around the Sun in their orbits?
A) Their own motion and the Sun’s gravity
B) The push of other planets
C) The light from the Sun
D) The wind in space
Answer: A) Their own motion and the Sun’s gravity
Explanation: Planets stay in orbit because of a balance between their forward motion and the Sun’s gravitational pull.
67. What happens to an object thrown straight up into the air?
A) It keeps going up forever
B) It slows down, stops, and falls back
C) It disappears
D) It moves in a zigzag motion
Answer: B) It slows down, stops, and falls back
Explanation: Gravity slows the object, stops it at its highest point, and then pulls it back down.
68. Which of the following statements about gravity is true?
A) It only acts on heavy objects
B) It can only pull objects downward
C) It acts between all objects with mass
D) It is strongest in space
Answer: C) It acts between all objects with mass
Explanation: Gravity exists between all objects with mass, no matter how small or large.
69. If gravity on Earth suddenly became twice as strong, what would happen to a person’s weight?
A) It would become half
B) It would remain the same
C) It would double
D) It would become zero
Answer: C) It would double
Explanation: Weight depends on gravity, so if gravity doubles, weight doubles too.
70. If a ball is rolling on a smooth surface, what force will eventually stop it?
A) Gravity
B) Magnetism
C) Friction
D) Air pressure
Answer: C) Friction
Explanation: Friction between the ball and the surface slows it down until it stops.
71. How does the force of gravity on Jupiter compare to that on Earth?
A) It is weaker
B) It is the same
C) It is stronger
D) There is no gravity on Jupiter
Answer: C) It is stronger
Explanation: Jupiter is much larger than Earth, so it has a stronger gravitational pull.
72. What happens to your weight if you travel deeper inside the Earth?
A) It increases
B) It decreases
C) It remains the same
D) It becomes zero
Answer: B) It decreases
Explanation: As you move toward Earth’s center, the pull of gravity weakens, reducing weight.
73. Why do astronauts feel weightless inside a spacecraft?
A) There is no gravity in space
B) They are in free fall
C) They are too far from Earth
D) The spacecraft’s speed cancels gravity
Answer: B) They are in free fall
Explanation: Astronauts orbit Earth in a constant state of free fall, making them feel weightless.
74. What would happen to Earth if there were no Sun’s gravity?
A) Earth would stop rotating
B) Earth would move in a straight line into space
C) Earth would crash into the Moon
D) Earth would spin faster
Answer: B) Earth would move in a straight line into space
Explanation: Without the Sun’s gravity, Earth would not orbit and would move in a straight line into space.
75. Why don’t we notice the force of gravity between two small objects?
A) Gravity only works on planets
B) Small objects have very weak gravity
C) Gravity does not exist between small objects
D) Air resistance cancels it out
Answer: B) Small objects have very weak gravity
Explanation: The force of gravity depends on mass, and small objects have too little mass for their gravity to be noticeable.
76. What shape does Earth have due to its rotation?
A) Perfect sphere
B) Flat disk
C) Oblate spheroid
D) Cube
Answer: C) Oblate spheroid
Explanation: Earth is an oblate spheroid, meaning it is slightly flattened at the poles and bulging at the equator due to rotation.
77. What will happen to an object if there is no force acting on it?
A) It will stop moving
B) It will move in a straight line at a constant speed
C) It will move in a circular path
D) It will gain weight
Answer: B) It will move in a straight line at a constant speed
Explanation: According to Newton’s First Law of Motion, an object will continue moving in a straight line unless a force acts on it.
78. What is the force that pulls everything toward the center of the Earth?
A) Magnetic force
B) Frictional force
C) Gravitational force
D) Nuclear force
Answer: C) Gravitational force
Explanation: Gravity pulls all objects toward the center of Earth, keeping them from floating away.
79. If a feather and a stone are dropped from the same height in a vacuum, which will hit the ground first?
A) The stone
B) The feather
C) Both will land at the same time
D) The feather will never fall
Answer: C) Both will land at the same time
Explanation: In a vacuum, there is no air resistance, so all objects fall at the same rate regardless of weight.
80. Why does the Sun appear to rise in the east and set in the west?
A) The Sun moves around Earth
B) The Earth rotates from west to east
C) The Moon’s gravity pulls the Sun
D) Clouds reflect sunlight in different directions
Answer: B) The Earth rotates from west to east
Explanation: The Earth’s rotation from west to east makes the Sun appear to rise in the east and set in the west.
81. What happens to your weight as you go higher up a mountain?
A) It increases
B) It decreases
C) It remains the same
D) It becomes zero
Answer: B) It decreases
Explanation: As altitude increases, gravity becomes weaker, causing weight to slightly decrease.
82. What would happen if Earth stopped rotating?
A) Days and nights would remain the same
B) One side of Earth would have continuous daylight and the other continuous night
C) The Earth would become smaller
D) Gravity would stop working
Answer: B) One side of Earth would have continuous daylight and the other continuous night
Explanation: If Earth stopped rotating, one side would always face the Sun, causing continuous day, while the other side would experience continuous night.
83. Why do satellites not fall to Earth even though gravity acts on them?
A) They are in free fall but move forward at high speed
B) They have no weight
C) They are pushed up by air
D) They do not experience gravity
Answer: A) They are in free fall but move forward at high speed
Explanation: Satellites are in a constant free fall, but their forward speed keeps them in orbit instead of crashing into Earth.
84. What causes a person to feel heavier at some places on Earth and lighter at others?
A) Changes in air pressure
B) Variations in Earth’s gravitational force
C) Differences in temperature
D) Rotation of the Moon
Answer: B) Variations in Earth’s gravitational force
Explanation: Gravity is slightly stronger at the poles and weaker at the equator, making weight vary slightly.
85. If you drop a book and a pencil from the same height, which will land first in normal air conditions?
A) The book
B) The pencil
C) Both at the same time
D) It depends on wind speed
Answer: A) The book
Explanation: In air, the pencil experiences more air resistance, so the heavier book lands first.
86. Why do objects weigh less on the Moon than on Earth?
A) The Moon has no gravity
B) The Moon has a weaker gravitational pull
C) The Moon repels objects
D) The Moon is closer to the Sun
Answer: B) The Moon has a weaker gravitational pull
Explanation: The Moon’s gravity is about 1/6th of Earth’s gravity, making objects weigh less.
87. Which of the following best describes the motion of the Moon around the Earth?
A) A straight-line motion
B) A circular orbit
C) A zigzag motion
D) A random movement
Answer: B) A circular orbit
Explanation: The Moon moves in a nearly circular orbit around Earth due to gravitational attraction.
88. What would happen if the Earth’s gravity became stronger?
A) Objects would weigh less
B) The Moon would move farther away
C) Objects would feel heavier
D) The Earth would stop rotating
Answer: C) Objects would feel heavier
Explanation: If gravity increased, weight would increase, making objects feel heavier.
89. If an astronaut jumps on the Moon, what will happen compared to jumping on Earth?
A) The astronaut will jump lower
B) The astronaut will jump higher
C) The astronaut will not be able to jump
D) The astronaut will fall faster
Answer: B) The astronaut will jump higher
Explanation: Due to the Moon’s lower gravity, astronauts can jump higher and farther than on Earth.
90. What keeps the atmosphere from escaping into space?
A) The rotation of the Earth
B) The weight of the air
C) The gravitational force of the Earth
D) The heat from the Sun
Answer: C) The gravitational force of the Earth
Explanation: Earth’s gravity holds the atmosphere close to the planet and prevents it from escaping into space.
91. What force is responsible for the falling of an apple from a tree?
A) Magnetic force
B) Frictional force
C) Gravitational force
D) Electrostatic force
Answer: C) Gravitational force
Explanation: Gravity pulls objects downward, causing an apple to fall from a tree.
92. How does gravity affect a moving ball thrown into the air?
A) It speeds it up
B) It slows it down and pulls it back
C) It makes it move in a straight line
D) It makes it disappear
Answer: B) It slows it down and pulls it back
Explanation: Gravity slows the ball as it moves up, stops it, and then pulls it back down.
93. If an astronaut travels to Mars, what will happen to his mass?
A) It will increase
B) It will decrease
C) It will remain the same
D) It will disappear
Answer: C) It will remain the same
Explanation: Mass is constant and does not change with location, unlike weight, which depends on gravity.
94. Why do satellites not fall straight down to Earth?
A) Earth’s gravity does not affect satellites
B) They are moving at high speed in orbit
C) They are too far away from Earth
D) Space has no air
Answer: B) They are moving at high speed in orbit
Explanation: Satellites are in a constant free fall but have enough forward speed to stay in orbit rather than crashing down.
95. If there was no gravity, what would happen to people on Earth?
A) They would float away into space
B) They would become heavier
C) They would sink into the ground
D) They would not be able to breathe
Answer: A) They would float away into space
Explanation: Without gravity, nothing would hold people and objects to Earth, and they would float into space.
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