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Physics is studied by science students and is concerned with the nature and properties of matter and energy. Physics topics include mechanics, heat, light and radiation, sound, electricity, magnetism, and the structure of atoms.
Study the following Physics past questions and answers for JAMB, WAEC, NECO and Post UTME. Prepare yourself with official past questions and answers for your upcoming examinations.
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Two magnets are used to magnetize a soft iron bar PQ as illustrated in the diagram given. The correct polarity at P and Q respectively
A) S and N
B) N and N
C) S and S
D) N and S
Related Lesson: Ferromagnets | Magnetism
Comments (7)In storing magnets, keepers are used to
A) reduced self-demagnetization
B) cancel the effect of the earth's magnetic field
C) protect the magnet from stray electric field
D) increase the strangth of the magnets
Related Lesson: Magnetic Attraction and Repulsion | Magnetism and Faraday's Law
Comments (1)A \(10\mu \mathrm{C}\) charge moves with a velocity of \(1.0 \times 10^5 ms^{-1}\) at right angle to a uniform magnetic field of flux density \(5.0 \times 10^{-4}T.\) Calculate the force on the charge.
A) \(5.0 \times 10^{-5} \mathrm{N}\)
B) \(5.0 \times 10^{-4} \mathrm{N}\)
C) \(5.0 \times 10^5 \mathrm{N}\)
D) \(5.0 \times 10^6 \mathrm{N}\)
Related Lesson: Force On a Moving Charge in a Magnetic Field | Magnetism
Comments (3)Which of the following statements is not correct about steel and soft iron?
A) steel is more magnetized than soft iron
B) permanent magnets are usually made of steel
C) soft iron is more readily magnetized than steel
D) soft iron more readily loses its magnetism than steel
Related Lesson: Summarizing Ferromagnets and Electromagnets | Magnetism
Comments (4)What determines the polarity at the ends of an electromagnet? The
A) magnitude of the current passing through the wire
B) material of the core of the magnet
C) material of the coil
D) direction of current in the wire
Related Lesson: Magnetic Field Created by a Long Straight Current-Carrying Wire | Magnetism
Comments (2)How many beta particle(s) are emitted in the radioactive decay of \(^{198}_{79} \mathrm{Au} \leftarrow ^{198}_{80} \mathrm{Hg}\)?
A) 1
B) 2
C) 3
D) 5
Related Lesson: Beta Decay | Radioactivity and Nuclear Physics
Comments (5)The phenomenon by which two light atomic nuclear combine to form a heavy nuclide with the release of energy is known as
A) radioactivity
B) nuclear fusion
C) nuclear fission
D) chain reaction
Related Lesson: Fusion | Medical Applications of Nuclear Physics
Comments (4)In a p-type semiconductor, the
A) number of holes are equal to the number of electrons
B) electrical resistivity increases
C) electrons are the majority charge carriers
D) holes are the majority charge carriers
Related Lesson: Semiconductors and Doping | Condensed Matter Physics
Comments (1)Let Δx be the uncertainty in the measurements of position and Δp the uncertainty in measurement of momentum. The uncertainty principle relation is given as
A) Δx . Δp = h
B) Δx . Δp ≤ h
C) Δx . Δp ≥h
D) Δx . Δp > h
Related Lesson: Heisenberg Uncertainty | Introduction to Quantum Physics
Comments (2)Two objects of masses 80kg and 50kg are separated by a distance of 0.2m. If the gravitational constant is 6.6 x 10-11Nm kg, calculate the gravitational attraction between them.
A) 4.9 × 10-9N
B) 1.3 × 10-6N
C) 6.6 × 10-8N
D) 6.6 × 10-6N
E) 2.6 × 10-9N
Related Lesson: Newton’s Law of Universal Gravitation | Newton's Laws
Comments (1)