NABTEB Physics Past Questions And Answers (Objective and Theory)

Section A: Physics NABTEB Objective Questions

Question: What is the primary function of a step-up transformer in an electrical power system?

A) Increase current

B) Increase voltage

C) Decrease current

D) Decrease voltage

Answer: B) Increase voltage

Question: Which of the following statements is correct about a concave lens?

A) Always converges parallel rays

B) Diverges parallel rays

C) Forms only virtual images

D) Has a positive focal length

Answer: B) Diverges parallel rays

Question: The SI unit of work is equivalent to which of the following?

A) Joule per second

B) Newton per meter

C) Watt-second

D) Newton-meter

Answer: D) Newton-meter

Question: What property of a material determines its resistance?

A) Density

B) Temperature

C) Mass

D) Volume

Answer: B) Temperature

Question: In a transistor, what is the function of the base?

A) Emitter control

B) Collector control

C) Amplification

D) Voltage regulation

Answer: C) Amplification

Section B: Physics NABTEB Theory Questions

Question: Discuss the principles of electromagnetic induction and its applications in everyday life.

Answer: Electromagnetic induction involves the generation of an electromotive force in a conductor by a changing magnetic field. Practical applications include generators, transformers, and induction cooktops.

Question: Explain the concept of pressure in fluids and how it varies with depth.

Answer: Pressure in fluids is the force exerted per unit area. It increases with depth due to the weight of the fluid above. This is described by Pascal’s law and is crucial in understanding hydraulic systems.

Question: Describe the formation and characteristics of standing waves.

Answer: Standing waves are formed by the interference of incident and reflected waves. They have nodes (points of zero amplitude) and antinodes (points of maximum amplitude) and play a role in musical instruments like guitars.

Question: Define the term half-life in radioactive decay and discuss its importance in dating geological materials.

Answer: Half-life is the time it takes for half of a radioactive substance to decay. It is crucial in radiometric dating, providing information about the age of rocks and fossils.

Question: Discuss the principles of operation and applications of a cathode-ray oscilloscope.

Answer: A cathode-ray oscilloscope displays electrical waveforms. It operates by deflecting electron beams in response to voltage signals. It is used for measuring and analyzing various electrical signals in laboratories and electronic testing.