# Physics Class 9 CBSE: Motion, Sound, Force, Work, and Energy Quiz

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## 18 Questions

### What is the difference between distance and displacement?

Distance is scalar and displacement is vector.

Frequency

### Which of Newton's laws states that an object will remain at rest or in uniform motion unless acted upon by a net external force?

Newton's First Law

Joule

Kinetic energy

### What principle states that the total amount of energy in a closed system remains constant over time?

Law of Conservation of Energy

### What are the three primary subatomic particles that compose an atom?

Proton, neutron, electron

### How is matter classified based on its properties?

Mass, volume, shape

Atom

Proton

### How is an element identified?

By its unique set of atoms

### What determines the atomic number of an element?

Number of protons in the nucleus

### What does the atomic number of an element represent?

Number of protons in an atom

### How do isotopes of an element differ from each other?

They have different numbers of neutrons

### What role does atomic structure play in determining the behavior of atoms when compressed?

Influence on the interactions with other atoms

### Which statement is true about the relationship between atomic number and nuclear charge?

Atomic number is directly proportional to nuclear charge

### In what way do isotopes of an element differ from each other?

Different atomic number but similar atomic mass number

### How does atomic structure contribute to understanding the properties of elements?

It provides a framework for understanding chemical reactions

## Physics Class 9 CBSE: Motion, Sound, Force, Work, and Energy

Motion and force are at the heart of Class 9 CBSE Physics. As you dive into these concepts, you'll also explore work, energy, and sound, which are fundamental to understanding our world.

### Motion

Motion is a change in position over time. In Class 9, you'll learn about distance, displacement, speed, velocity, and acceleration. You'll also learn about average and instantaneous values, as well as free fall and acceleration due to gravity.

### Sound

Sound is a vibration that travels through a medium and causes our ears to perceive it as sound. You'll learn about sound's properties, such as amplitude, frequency, and wavelength, as well as how sound travels through solids, liquids, and gases.

### Force

Force is a push or pull that causes an object to change its motion or shape. Newton's laws of motion, Newton's second law, and the relationship between force and mass are central to your understanding of force.

### Work

Work is the force applied to an object, multiplied by the displacement of the object in the direction of the force. Work is measured in joules and is a fundamental concept in the study of energy.

### Energy

Energy is the ability to do work. In Class 9, you'll learn about different forms of energy, such as kinetic, potential, thermal, light, and sound energy. You'll also study the law of conservation of energy, which states that the total amount of energy remains constant in a closed system.

### Work and Energy

The work-energy theorem, which states that the net work done on an object is equal to the change in the object's kinetic energy, is a significant concept to understand. You'll also learn about power, the rate of doing work, and the unit Watt (joules per second).

Work and energy are often intertwined, as they describe how objects interact with each other and the environment. A deeper understanding of these topics will set you up for success in your studies and help you appreciate the world around you.

Explore key concepts of motion, sound, force, work, and energy in Class 9 CBSE Physics. Learn about displacement, velocity, sound properties, Newton's laws, work-energy theorem, and more to enhance your understanding of the physical world.

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