NECO Physics 2025: Questions with Answers

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:

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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.

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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

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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.

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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​

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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

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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

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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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