Matric Physical Sciences

Question 1

What is the SI unit of force?

Accepted Answer

Newton

Answer

Force is measured in newtons (N), defined as the force that gives a 1 kg mass an acceleration of 1 m·s⁻².

Question 2

An object of mass 5 kg accelerates at 2 m·s⁻². What is the net force acting on it?

Accepted Answer

10 N

Answer

Newton's second law: F = ma = 5 × 2 = 10 N.

Question 3

Which of the following is the chemical formula for water?

Accepted Answer

H₂O

Answer

Water consists of two hydrogen atoms and one oxygen atom, written as H₂O.

Question 4

What type of bond forms between a metal and a non-metal through the transfer of electrons?

Accepted Answer

Ionic bond

Answer

Ionic bonds form when electrons transfer from a metal to a non-metal, creating oppositely charged ions that attract.

Question 5

Calculate the work done when a force of 20 N moves an object 4 m in the direction of the force.

Accepted Answer

80 J

Answer

Work = force × distance = 20 × 4 = 80 J.

Matric (NSC) Exam Practice Practice Test