WAEC Physics Past Questions and Answers (Objective and Theory)

Section A: Physics WAEC Objective Questions

 

Question: What is the SI unit of electric current?

 

A) Watt

B) Ampere

C) Volt

D) Ohm

Answer: B) Ampere

 

Question: Which of the following is a vector quantity?

 

A) Speed

B) Mass

C) Acceleration

D) Temperature

Answer: C) Acceleration

 

Question: In a concave mirror, where is the image formed when the object is located between the focus and the mirror?

 

A) Beyond C

B) At F

C) Between F and C

D) Between C and mirror

Answer: A) Beyond C

 

Question: What happens to the resistance of a conductor if its temperature increases?

 

A) Increases

B) Decreases

C) Remains constant

D) Becomes zero

Answer: A) Increases

 

Question: The force acting on a body of mass 5 kg, which produces an acceleration of 2 m/s², is:

 

A) 5 N

B) 10 N

C) 2.5 N

D) 7.5 N

Answer: B) 10 N

 

Question: What is the formula for calculating mechanical advantage in a simple machine?

 

A) Velocity ratio / Efficiency

B) Load / Effort

C) Effort / Load

D) Load × Effort

Answer: C) Effort / Load

 

Question: Which of the following statements is true about a converging lens?

 

A) Always forms a virtual image

B) Diverges parallel rays of light

C) Forms both real and virtual images

D) Forms only real images

Answer: D) Forms only real images

 

Question: The phenomenon of radioactivity was first observed by:

 

A) Marie Curie

B) Ernest Rutherford

C) Henri Becquerel

D) Albert Einstein

Answer: C) Henri Becquerel

 

Question: What is the work done when a force of 20 N moves an object through a distance of 5 m in the direction of the force?

 

A) 100 J

B) 25 J

C) 4 J

D) 1 J

Answer: A) 100 J

 

Question: Which of the following is a unit of electric potential difference?

 

A) Volt

B) Joule

C) Ampere-hour

D) Watt

Answer: A) Volt

 

Section B: Physics WAEC Theory Questions

Question: Explain the concept of projectile motion and provide an example.

Answer: Projectile motion involves the motion of an object projected into the air, influenced only by gravity and air resistance. An example is a ball thrown horizontally.

 

Question: Define Hooke’s Law and explain its significance in the study of elasticity.

Answer: Hooke’s Law states that the force required to extend or compress a spring by a distance is proportional to that distance. It is vital in understanding the behavior of materials under deformation.

 

Question: Describe the process of nuclear fission and its applications.

Answer: Nuclear fission is the splitting of a heavy atomic nucleus into two lighter nuclei. Its applications include nuclear power generation and nuclear weapons.

 

Question: Explain the term electromagnetic induction and provide an example.

Answer: Electromagnetic induction is the generation of an electromotive force in a conductor by a changing magnetic field. An example is a coil moving in and out of a magnetic field, inducing a current.

 

Question: Discuss the principles behind the operation of an optical fiber in communication.

Answer: Optical fibers use total internal reflection to transmit light signals through thin glass fibers, enabling high-speed and long-distance communication.

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