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JAMB Physics Past Questions 2019

10 questions from the JAMB 2019 Physics paper, with answers and explanations. Tap "Show answer" under each one when you are ready.

JAMB 2019Question 1 · Electricity and Magnetism
Lamps in domestic lightings are usually in
  1. A.series
  2. B.divergent
  3. C.convergent
  4. D.parallel
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Answer: D. parallel

Domestic lighting circuits are wired in parallel.

JAMB 2019Question 2 · Electricity and Magnetism
Three resistors with resistance 200Ω, 500Ω and 1kΩ are connected in series. A 6v battery is connected to either end of the combination. Calculate the potential difference between the ends of 200Ω resistance.
  1. A.
  2. B.
  3. C.
  4. D.
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Answer: A.

I==; V(200)=0.00353x200=.

JAMB 2019Question 3 · General Physics and Measurement
One newton × One meter equals?
  1. A.One water
  2. B.One Joule
  3. C.One ampere
  4. D.One kilogram
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Answer: B. One Joule

A newton-metre is a joule.

JAMB 2019Question 4 · Heat and Thermodynamics
A metal rod has a length of at . At what temperature will its length be . If the linear expansivity of the material of the rod is
  1. A.
  2. B.
  3. C.
  4. D.
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Answer: D.

deltaT=(99.4-100)/()=-300; new temp=200-300=.

JAMB 2019Question 5 · Heat and Thermodynamics
Efficiency of conduction in liquids and gases compared to solids is
  1. A.less efficient than solid
  2. B.more efficient than solids
  3. C.equally efficient to solids
  4. D.efficiently may vary
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Answer: A. less efficient than solid

Conduction in liquids and gases is generally less efficient than in solids.

JAMB 2019Question 6 · Mechanics, Motion, and Energy
A single force which produces the same effect as a set of forces acting together at a point is known as the
  1. A.component
  2. B.equilibrant
  3. C.resultant
  4. D.resistant
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Answer: C. resultant

A single force equivalent to a set of forces acting at a point is the resultant.

JAMB 2019Question 7 · Mechanics, Motion, and Energy
"Sum of all forces acting on a body is zero." This condition represents equilibrium'
  1. A.First condition
  2. B.Second condition
  3. C.Third condition
  4. D.Fourth condition
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Answer: A. First condition

Sum of forces equal to zero is the first condition for equilibrium.

JAMB 2019Question 8 · Properties of Matter and Fluids
According to kinetic molecular model, in gases
  1. A.The molecule are very fast apart, occupy all the space made available
  2. B.The particles occur in clusters with molecules slightly farther apart
  3. C.The particles vibrate about fixed positions and are held together by the strong intermolecular bond between them
  4. D.The particles are closely packed together, they occupy minimum space, are usually arranged in a regular pattern
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Answer: A. The molecule are very fast apart, occupy all the space made available

In gases, molecules are far apart and spread to occupy all available space.

JAMB 2019Question 9 · Waves, Sound, and Optics
The distance between an object and its real image in a convex lens is . If the magnification of the image is 3, calculate the focal length of the lens
  1. A.
  2. B.
  3. C.
  4. D.
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Answer: B.

u+v=40 and v=3u gives u=10, v=30; f=1/(+)=.

JAMB 2019Question 10 · Waves, Sound, and Optics
A microscope is focused on a mark on a table, when the mark is covered by a plate of glass thick, the microscope has to be raised for the mark to be once more in focus. Calculate the refractive index.
  1. A.1.50
  2. B.1.68
  3. C.2.58
  4. D.1.82
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Answer: A. 1.50

n=real depth/(real depth-apparent shift)=2/(2-0.67)=1.50.

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