Physics 11th Chap 4 : Topic 7 - Maryam Publications

Physics Chapter 4 : Topic 7

Weightlessness in Satellites

1 / 36

Objects inside an orbiting satellite appear weightless because:

A) The satellite and objects inside it are in continuous free fall.

B) The atmosphere pushes objects upward.

C) Objects lose their mass in orbit.

D) There is no gravitational force in space.

2 / 36

Weightlessness in a satellite means:

A) The mass of an object becomes zero.

B) The object has no inertia.

C) The apparent weight becomes zero.

D) Gravity stops acting on the object.

3 / 36

Astronauts inside an orbiting spacecraft float because:

A) Their mass decreases.

B) They and the spacecraft accelerate together toward Earth.

C) There is no motion in space.

D) Gravity does not exist there.

4 / 36

The force responsible for keeping a satellite in orbit around Earth is:

A) Frictional force

B) Gravitational force

C) Electric force

D) Magnetic force

5 / 36

The actual weight of an astronaut in orbit is:

A) Zero because gravity disappears.

B) Zero because mass disappears.

C) Almost the same gravitational force acting on Earth, depending on orbit height.

D) Infinite due to high speed.

6 / 36

Apparent weight of an object is measured by:

A) The supporting force acting on it.

B) Its mass.

C) The gravitational field strength only.

D) Its velocity.

7 / 36

A weighing scale inside an orbiting satellite shows zero reading because:

A) The scale stops working.

B) The astronaut has no mass.

C) There is no gravity.

D) No normal reaction force acts on the astronaut.

8 / 36

The condition of weightlessness in a satellite is similar to:

A) Being completely motionless

B) Standing on Earth

C) Falling freely under gravity

D) Moving at constant speed on a road

9 / 36

A satellite orbiting Earth is actually:

A) Continuously falling toward Earth but missing it

B) Moving without acceleration

C) Outside Earth’s gravitational field

D) Moving away from Earth permanently

10 / 36

If gravity suddenly disappeared for an orbiting satellite, it would:

A) Continue in a circular path

B) Stop immediately

C) Fall toward Earth

D) Move along a straight-line tangent path

11 / 36

Which statement about weightlessness is correct?

A) Astronauts have zero apparent weight.

B) Astronauts have zero mass.

C) Gravity is zero inside satellites.

D) Earth has no effect on satellites.

12 / 36

The apparent weight of an astronaut becomes zero because:

A) The satellite stops moving.

B) The gravitational force becomes zero.

C) The mass becomes zero.

D) The normal reaction force becomes zero.

13 / 36

An astronaut in an orbiting satellite is not pulled down to Earth because:

A) Gravity does not act.

B) The satellite is continuously falling around Earth.

C) The astronaut has no weight.

D) There is no acceleration.

14 / 36

The acceleration of an orbiting satellite is caused by:

A) Engine force only

B) Gravitational force

C) Air resistance

D) Magnetic force

15 / 36

Weightlessness can be experienced by:

A) A person standing on Earth

B) A person walking normally

C) A person inside a freely falling elevator

D) A person sitting on a chair

16 / 36

In an orbiting satellite, the floor of the spacecraft does not push upward on astronauts because:

A) The floor disappears.

B) Both are falling together.

C) Gravity is absent.

D) Astronauts have no mass.

17 / 36

The term “zero gravity” used for astronauts is:

A) True only near Earth

B) A law of physics

C) Completely correct

D) A misconception

18 / 36

The gravitational force on an astronaut in orbit acts:

A) Toward Earth

B) Away from Earth

C) Along the direction of velocity

D) Opposite to velocity

19 / 36

If the orbital height of a satellite increases, gravitational force on it generally:

A) Becomes infinite

B) Increases

C) Remains exactly constant

D) Decreases

20 / 36

A satellite is moving around Earth with astronauts inside. The astronauts feel weightless because:

A) They are outside Earth’s gravity.

B) Their acceleration is zero.

C) Their acceleration equals the satellite’s acceleration.

D) Their velocity is zero.

21 / 36

If an astronaut leaves an orbiting satellite, the astronaut will:

A) Continue moving with orbital velocity

B) Immediately stop moving

C) Fall vertically downward

D) Move away with infinite speed

22 / 36

A person feels weightless during a free fall because:

A) Their velocity becomes zero

B) Gravity disappears

C) Their mass decreases

D) There is no normal reaction force

23 / 36

The centripetal force for an orbiting satellite is provided by:

A) Friction

B) Tension

C) Gravity

D) Normal force

24 / 36

When a satellite is orbiting Earth, the acceleration direction is:

A) Zero

B) Along its velocity

C) Toward Earth’s center

D) Away from Earth

25 / 36

An astronaut inside a satellite drops a ball. The ball will:

A) Fall to the floor normally

B) Float beside the astronaut

C) Move upward permanently

D) Stop moving

26 / 36

The gravitational force on an astronaut in orbit is $\mathbf{700\ N}$. The astronaut’s apparent weight is:

A) $\mathbf{1400\ N}$

B) $\mathbf{350\ N}$

C) Zero

D) $\mathbf{700\ N}$

27 / 36

A satellite and astronaut have the same acceleration because:

A) Gravity acts on both equally per unit mass.

B) They are stationary.

C) There is no gravity.

D) They have the same mass.

28 / 36

A satellite at a lower orbit experiences greater gravitational force. This means:

A) Gravity stops acting.

B) Mass becomes zero.

C) It cannot be weightless.

D) It can still appear weightless.

29 / 36

The main reason astronauts do not feel their actual weight in orbit is:

A) Their bodies lose energy.

B) Their mass becomes smaller.

C) They have no gravitational attraction.

D) There is no supporting surface force.

30 / 36

If a satellite slows down suddenly while orbiting Earth, it will:

A) Stop immediately

B) Move into a lower orbit

C) Leave Earth’s gravity

D) Move into a higher orbit

31 / 36

Why do astronauts inside satellites not stand on the floor?

A) Astronauts have no weight

B) The satellite has no floor

C) Gravity is absent

D) Floor and astronauts fall together

32 / 36

Which quantity remains unchanged during orbital weightlessness?

A) Apparent weight

B) Mass

C) Normal force

D) Support force

33 / 36

The difference between masslessness and weightlessness is:

A) There is no difference.

B) Masslessness means no mass, weightlessness means no apparent weight.

C) Masslessness occurs in satellites.

D) Weightlessness occurs only on Earth.

34 / 36

The Moon appears weightless in its orbit because:

A) It is stationary.

B) It is in continuous free fall around Earth.

C) It has no mass.

D) There is no gravity in space.

35 / 36

If the Earth stopped attracting a satellite, the satellite would:

A) Move straight due to inertia

B) Continue circular motion

C) Become weightless instantly but remain in orbit

D) Fall faster

36 / 36

The correct explanation of satellite weightlessness is:

A) Satellites and objects inside them are freely falling together.

B) Satellites move beyond Earth’s gravitational field.

C) Objects lose their mass in orbit.

D) Gravity does not exist in space.

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