# Corpus Christi Year 7 Making Changes

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Making Changes Quiz

Questions and Answers
• 1.

### 1.     A chair is dragged across four surfaces – lino, carpet, concrete and ice. Over which surface would the chair experience the LEAST friction?

• A.

(a) the lino

• B.

(b) the carpet

• C.

(c) the concrete

• D.

(d) the ice

Correct Answer
D. (d) the ice
Explanation
The chair would experience the least friction on the ice surface because ice has a very low coefficient of friction. The smoothness and slipperiness of the ice surface reduces the resistance between the chair and the ice, resulting in less friction compared to the other surfaces.

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• 2.

### 11.     If a force can act upon an object without touching it, what do we classify the force as?

• A.

The force is a contact force

• B.

The force does not exist

• C.

The force is a non-contact force

• D.

The force is unbalanced

Correct Answer
C. The force is a non-contact force
Explanation
A non-contact force is a force that can act upon an object without physical contact. This means that the force can exert an influence on an object from a distance without any direct interaction. Examples of non-contact forces include gravitational force, magnetic force, and electrostatic force. These forces can affect objects without the need for physical contact, making them non-contact forces.

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• 3.

### 1.     Gravity can best be described as …

• A.

A force that pulls you towards the centre of the Earth

• B.

A force that pushes you downwards towards the Earth

• C.

A contact force

• D.

A force that creates heat

Correct Answer
A. A force that pulls you towards the centre of the Earth
Explanation
Gravity is a force that pulls objects towards the center of the Earth. This force is responsible for keeping objects on the ground and causing objects to fall when dropped. It is an attractive force that acts between any two objects with mass.

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• 4.

### 1.     What is a force?

• A.

An animal

• B.

A push or a pull

• C.

A “Magnetic Field”

• D.

A measuring scale

Correct Answer
B. A push or a pull
Explanation
A force is defined as a push or a pull. It is a physical interaction between two objects that causes a change in their motion or shape. Forces can be exerted through direct contact or at a distance, such as gravity pulling objects towards the Earth. This definition encompasses the basic concept of force and its fundamental role in the study of physics.

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• 5.

### 1.     What happens when you put two magnets together end to end?

• A.

North and North attract each other

• B.

North and North push each other away

• C.

North and South push each other away

• D.

South and South attract each other

Correct Answer
B. North and North push each other away
Explanation
When two magnets with the same polarity (in this case, both magnets have their north poles facing each other) are put together end to end, they will push each other away. This is because like poles repel each other due to the magnetic force between them.

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• 6.

### 1.     If a paper clip and a piece of wood entered a magnetic field, what would happen?

• A.

The paper clip would stay still, and the wood would be attracted to the magnet

• B.

Both the paper clip and the wood would not move

• C.

The paper clip would be pushed out of the magnetic field

• D.

The paper clip would be attracted to the magnet, but the wood would not

Correct Answer
D. The paper clip would be attracted to the magnet, but the wood would not
Explanation
The paper clip would be attracted to the magnet because it is made of a material, such as iron, that is magnetic and can be magnetized. On the other hand, wood is not magnetic and does not contain any magnetic properties, so it would not be affected by the magnetic field and would not be attracted to the magnet.

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• 7.

### 1.     Which of the following is an example of Electrostatic Force?

• A.

Holding a charged balloon above your hair, so your hair rises and sticks to the balloon

• B.

Falling downwards during a Bungee Jump

• C.

A blister created by your shoes rubbing against your skin

• D.

A magnet attracting a piece of iron

Correct Answer
A. Holding a charged balloon above your hair, so your hair rises and sticks to the balloon
Explanation
When a charged balloon is held above the hair, the balloon becomes charged with static electricity. The positively charged hair is attracted to the negatively charged balloon due to electrostatic force, causing the hair to rise and stick to the balloon. This phenomenon demonstrates the interaction between charged objects and the force of attraction or repulsion between them, which is the basis of electrostatic force.

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• 8.

### 1.     Which of the following is INCORRECT?

• A.

Forces can start objects moving

• B.

Forces can slow objects down

• C.

Forces can cause objects to change direction

• D.

Forces cannot bend or twist things

Correct Answer
D. Forces cannot bend or twist things
Explanation
Forces can bend or twist things. Forces can cause objects to change their shape or deform them.

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• 9.

### 1.     Which of the following is INCORRECT?

• A.

When the forces are balanced, there is no motion

• B.

When forces are unbalanced, there is motion

• C.

When you are sitting in a chair, the forces acting on you are balanced

• D.

When you jump off the ground, the forces acting on you are balanced

Correct Answer
D. When you jump off the ground, the forces acting on you are balanced
• 10.

### 1.     Forces are measured in Newtons. How many Newtons are required to move a 1 kg bag of sugar?

• A.

100 N

• B.

10 N

• C.

1 N

• D.

0.1 N

Correct Answer
B. 10 N
Explanation
To move a 1 kg bag of sugar, a force of 10 N is required. This is because the weight of an object can be calculated by multiplying its mass (1 kg) by the acceleration due to gravity (10 m/s^2). Therefore, the force required to overcome the weight of the bag of sugar is 10 N.

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• 11.

### 1.     What are the names of the instruments we use to measure forces?

• A.

Spring balances, Newtonmeters and scales

• B.

Spring balances, rulers and a beaker

• C.

Spring balances, Force detector and scales

• D.

Spring balances, scales and a ruler

Correct Answer
A. Spring balances, Newtonmeters and scales
Explanation
Spring balances, Newtonmeters, and scales are the instruments used to measure forces. Spring balances are devices that use the principle of Hooke's law to measure the force exerted on them. Newtonmeters, also known as force meters or force gauges, are specifically designed to measure forces in newtons. Scales are used to measure the weight of an object, which is a force due to gravity. Together, these instruments provide various options for measuring different types and magnitudes of forces.

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• 12.

### 1.     Which of the following is INCORRECT, in terms of friction?

• A.

Friction is a force that occurs when two surfaces move past each other

• B.

Friction does not oppose motion or movement

• C.

Ice is one of the few almost frictionless surfaces known to man

• D.

Friction keeps knots tied, and nails in place

Correct Answer
B. Friction does not oppose motion or movement
Explanation
Friction is a force that occurs when two surfaces move past each other. It opposes motion or movement, which means it acts in the opposite direction to the applied force. This is why it is incorrect to say that friction does not oppose motion or movement.

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• 13.

### 1.     Which of the following is NOT a method of reducing friction?

• A.

Using a lubricant such as oil or grease between the two moving surfaces

• B.

Blowing air between the two surfaces

• C.

Giving the surfaces a streamlined shape

• D.

Covering the surfaces in wax

Correct Answer
D. Covering the surfaces in wax
Explanation
Covering the surfaces in wax is not a method of reducing friction because wax can actually increase friction between surfaces. Wax is a sticky substance that can create more resistance between two surfaces, making it harder for them to slide or move smoothly. Therefore, using wax to cover surfaces would not help in reducing friction.

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• 14.

### 1.     Which of the following experiences the strongest Gravitational (Attractive) Force?

• A.

You and the Earth

• B.

The Moon and the Sun

• C.

The Earth and the Sun

• D.

The Earth and the Moon

Correct Answer
A. You and the Earth
Explanation
The correct answer is "You and the Earth." The gravitational force between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. Since the mass of the Earth is much larger than the mass of an individual, the gravitational force between you and the Earth is stronger than any other pair of objects listed.

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• 15.

### 1.     Which of the following is TRUE?

• A.

People would weigh less on Jupiter than they would on Earth

• B.

People would weigh more on the Moon than they would on Earth

• C.

Both your mass and your weight changes when you go to the Moon

• D.

Only your weight changes when you go to the Moon. Your mass stays the same.

Correct Answer
D. Only your weight changes when you go to the Moon. Your mass stays the same.
Explanation
Weight is a measure of the force of gravity acting on an object, while mass is a measure of the amount of matter in an object. On the Moon, the force of gravity is about 1/6th of that on Earth, so a person would weigh less on the Moon than they would on Earth. However, their mass would remain the same because mass is an intrinsic property of an object and does not change with location.

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• 16.

### 1.     Which of the following is INCORRECT?

• A.

Some metals, such as iron, nickel and cobalt are attracted to magnets

• B.

Some metals, such as aluminium and zinc are not attracted to magnets

• C.

Materials that are attracted to magnets are said to be magnetic

• D.

All materials can be turned into magnets

Correct Answer
D. All materials can be turned into magnets
Explanation
The statement "All materials can be turned into magnets" is incorrect. Not all materials can be turned into magnets. Only certain materials, such as iron, nickel, and cobalt, have magnetic properties and can be attracted to magnets.

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• 17.

### 1.     Which of the following is TRUE?

• A.

The Earth does not have its own Magnetic Field

• B.

There is a giant magnet inside the Earth

• C.

Compasses rely on the Earth’s magnetic field to work

• D.

When you suspend a magnet by a thread, it lines up North to South

Correct Answer
C. Compasses rely on the Earth’s magnetic field to work
Explanation
Compasses rely on the Earth's magnetic field to work because they are designed to align with the Earth's magnetic field. The Earth acts as a giant magnet with its magnetic field lines running from the geographic North Pole to the geographic South Pole. The compass needle, which is a small magnet, aligns itself with the Earth's magnetic field, allowing us to determine the direction of North and South.

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• 18.

### 1.     Aurora Australis (The Southern Lights) are caused by:

• A.

Chemical toxins in the air

• B.

Charged particles from the Sun, that are attracted to the South Pole

• C.

Fireworks

• D.

The Southern lights do not exist

Correct Answer
B. Charged particles from the Sun, that are attracted to the South Pole
Explanation
Charged particles from the Sun, that are attracted to the South Pole, cause the Aurora Australis (The Southern Lights). These charged particles, also known as solar wind, are made up of electrons and protons that are emitted by the Sun. When these particles reach the Earth's atmosphere, they interact with gases such as oxygen and nitrogen, causing them to emit light. The South Pole is particularly susceptible to these lights because of its magnetic field, which attracts the charged particles. This phenomenon creates the beautiful light display known as the Aurora Australis.

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• 19.

### 1.     There are two types of electric charges. They are:

• A.

Balanced and Unbalanced charges

• B.

Positive and Negative Charges

• C.

Positive and Neutral Charges

• D.

Balanced and Negative Charges

Correct Answer
B. Positive and Negative Charges
Explanation
The correct answer is "Positive and Negative Charges". This is because positive and negative charges are the two fundamental types of electric charges. Positive charges are associated with protons, which have a positive charge, while negative charges are associated with electrons, which have a negative charge. These charges attract each other, creating an electric force.

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• 20.

### 1.     There are laws that tell us how Charged particles behave. Which of the following laws is INCORRECT?

• A.

Charged objects attract other charged objects

• B.

Two positive charges will repel each other

• C.

Two negative charges will repel each other

• D.

Two opposite charges will attract each other

Correct Answer
D. Two opposite charges will attract each other
Explanation
This statement is incorrect because two opposite charges will indeed attract each other. The correct statement would be "Two opposite charges will repel each other."

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• 21.

### 1.     Electric charges build up on objects due to the friction between them. The build up of these electric charges is called static electricity. The word “static” means:

• A.

Dangerous

• B.

Stationary

• C.

Moving

• D.

Safe

Correct Answer
B. Stationary
Explanation
The word "static" means stationary. In the context of static electricity, it refers to the build-up of electric charges on objects that do not move or flow. This build-up occurs due to friction between objects, causing the charges to remain stationary on the surface of the objects.

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• 22.

### 1.     Electrostatic force is similar to Magnetic force. Which of the following do they NOT have in common?

• A.

Both forces have a field – an area in which the force will act on another object

• B.

Both forces are non-contact

• C.

Both forces are created by charged particles

• D.

Both forces can exert a push or a pull

Correct Answer
C. Both forces are created by charged particles
Explanation
Both forces have a field – an area in which the force will act on another object. Both forces are non-contact. Both forces can exert a push or a pull.

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• 23.

### 1.     When electric current flows through a wire, it produces a magnetic field. What is this effect called?

• A.

Electitis

• B.

Electromagenta

• C.

Solenoid

• D.

Electromagnetism

Correct Answer
D. Electromagnetism
Explanation
When electric current flows through a wire, it generates a magnetic field. This phenomenon is known as electromagnetism.

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• 24.

### 1.     The magnetic field of a wire can be made stronger if the wire is wound in a coil, and a bar of iron is placed inside the coil. What name do we give this tightly coiled wire that produces a magnetic field?

• A.

Solenoid

• B.

Maglev

• C.

Newtonmeter

• D.

Van de Graaf Generator

Correct Answer
A. Solenoid
Explanation
A solenoid is a tightly coiled wire that produces a magnetic field. When a bar of iron is placed inside the coil, the magnetic field becomes stronger due to the iron's ability to enhance the magnetic field. Solenoids are commonly used in various applications such as electromagnets, transformers, and inductors.

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• 25.

### 1.     Forces can:

• A.

Start and stop motion

• B.

Change the direction of motion

• C.

Speed up or slow down motion

• D.

All of the above

Correct Answer
D. All of the above
Explanation
Forces are capable of starting and stopping motion, changing the direction of motion, and speeding up or slowing down motion. This is because forces can exert a push or pull on an object, which can cause it to move or change its motion in various ways. Therefore, all of the given options are correct.

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• Current Version
• Mar 20, 2023
Quiz Edited by
ProProfs Editorial Team
• Dec 01, 2009
Quiz Created by
Ssharman

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