Free NTA Physics Question and Answers

Question 1

What is Newton's First Law of Motion?

Accepted Answer

An object in motion stays in motion unless acted upon by an external force.

Answer

Newton's First Law of Motion, also known as the Law of Inertia, states that an object at rest will stay at rest, and an object in motion will stay in motion with the same speed and in the same direction, unless acted upon by an unbalanced external force. This law describes the tendency of objects to resist changes in their state of motion.

Question 2

What is the unit of electrical resistance?

Accepted Answer

Ohm

Answer

The Ohm (Ω) is the standard unit of electrical resistance, named after German physicist Georg Simon Ohm. Electrical resistance is a measure of how much a material opposes the flow of electric current. A higher resistance means that more voltage is required to produce a given current.

Question 3

Which law explains why a rocket can move in space?

Accepted Answer

Newton's Third Law

Answer

Newton's Third Law states that for every action, there is an equal and opposite reaction. A rocket expels hot gases downwards (action), and in response, the gases exert an equal and opposite force upwards, propelling the rocket forward. This principle allows the rocket to accelerate even in the vacuum of space, as it doesn't need air to push against.

Question 4

What is the speed of light in a vacuum?

Accepted Answer

3 × 10^8 meters per second

Answer

The speed of light in a vacuum, denoted by 'c', is a fundamental physical constant. Its universally accepted value is approximately 299,792,458 meters per second, which is commonly rounded to 3 × 10^8 meters per second. This speed represents the absolute upper limit for the speed at which all conventional matter and information can travel.

Question 5

What is the principle of conservation of energy?

Accepted Answer

Energy can neither be created nor destroyed, only transformed.

Answer

The principle of conservation of energy, also known as the First Law of Thermodynamics, states that energy cannot be created or destroyed within a closed system. Instead, it can only be transformed from one form to another, such as from potential energy to kinetic energy or chemical energy to heat. The total amount of energy in the universe remains constant, only changing its manifestation.

NTA - National Testing Agency Practice Test

NTA - National Testing Agency Practice Test

Free NTA Physics Question and Answers