ALLCBTs

NECO Physics 2025: Questions with Answers

Published on Jul 2, 2025 • Education

Welcome, students!
My name is Cyril and in today’s tutorial, we’ll be exploring some of the most likely NECO Physics past questions. Get your writing materials and calculator ready — we’re diving right into real, exam-relevant problems that will boost your confidence and your score.

You can watch the full class in the video below:

Question 1: Force on a Charged Particle in a Magnetic Field

Problem:
A particle of charge Q and mass M, moving with velocity V, enters a uniform magnetic field B in the same direction as the field. What is the force on the particle?

Answer: Zero

Explanation:
The formula for force on a charged particle in a magnetic field is: F=BQVsin⁡θF = BQV \sin \thetaF=BQVsinθ

Since the particle moves in the direction of the magnetic field, θ=0∘\theta = 0^\circθ=0∘, and sin⁡0=0\sin 0 = 0sin0=0.
So, F = 0.

Question 2: Understanding the Helium Isotope H³₂

Problem:
What is the proton and neutron composition of the helium isotope H³₂?

Answer: 2 Protons and 1 Neutron

Explanation:

• Atomic number = number of protons = 2
• Mass number = protons + neutrons = 3
• Neutrons = 3 - 2 = 1

Correct option: B. 2 protons and 1 neutron

Question 3: Emission of Electrons from Heated Metal

Problem:
When a metal is heated to a high temperature and emits electrons from its surface, what is this process called?

Answer: Thermionic Emission

Explanation:
This is the release of electrons due to heat energy from the surface of a metal. It’s widely used in vacuum tubes and cathode ray tubes.

Question 4: Finding Upthrust in a Liquid

Problem:
A stone weighs 180 N in air and 150 N in a beaker of methylated spirit. What is the upthrust?

Answer: 30 N

Explanation:
Upthrust = Weight in air − Weight in liquid =180N−150N=30N= 180 N - 150 N = \boxed{30 N}=180N−150N=30N​

Question 5: Calculating Decay Constant

Problem:
If the half-life of a radioactive substance is 2 seconds, what is the decay constant?

Answer: 0.347 s⁻¹

Explanation:
The formula is: λ=0.693T1/2=0.6932=0.347 s−1\lambda = \frac{0.693}{T_{1/2}} = \frac{0.693}{2} = 0.347 \, \text{s}^{-1}λ=T1/2​0.693​=20.693​=0.347s−1

Correct option: D

Question 6: Slowing Down Fast Neutrons in Nuclear Reactors

Problem:
Which of the following is used in nuclear reactors to slow down fast-moving neutrons?

Answer: Graphite Rod

Explanation:
Graphite acts as a moderator in nuclear reactors. It slows down high-speed neutrons, allowing them to effectively trigger further fission reactions.

Watch more educational videos and past questions: https://youtube.com/@allcbts

Final Notes for NECO Physics 2025 Success

• Master formulas: like F=BQVF = BQVF=BQV, radioactive decay, and mechanics equations.
• Understand applications: such as thermionic emission, half-life, and Archimedes’ principle.
• Practice with real scenarios: like weight in fluid and upthrust.
• Revise nuclear physics: particularly how reactors work and the roles of moderators.

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