All 10 questions from the Post-UTME Screening (Post-UTME) Physics 2007 Objective paper, with the correct answer and a full explanation for each. Free, no signup needed.
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The dimension of Young's modulus is written as M^xL^yT^z. Determine the values of x, y and z respectively
Young's modulus has the dimensions of pressure/stress: ML^-1T^-2; presented with reduced confidence given the exact printed options did not precisely match this derivation.
Two quantities that can be determined from a velocity-time graph are
The gradient of a velocity-time graph gives acceleration/retardation, and the area under the graph gives distance covered.
A body of density 0.80kg/m^3 weighs 120N in air. It is suspended with a string with 1/3 of its volume immersed in a liquid of density 0.6kg/m^3, find the tension in the string(g=10ms^-2)
Using the buoyancy principle with the given density ratio and immersed fraction, the tension works out closest to 65N; presented with some uncertainty due to unclear unit/value legibility in the scan.
Which of the following sources of energy is non-renewable?
Biomass is flagged here as the least strictly renewable of the four if harvested unsustainably, though all four are generally classified as renewable energy sources; this item may reflect incomplete option transcription in the source scan.
Which of the following statements is correct about latent heat? It
Latent heat is the energy used to break down (or form) intermolecular bonds during a phase change, without changing temperature.
The energy carried by an electromagnetic radiation depends on
The energy of electromagnetic radiation (E=hf) depends on its frequency.
If the polarizing angle for a given optical material is 49 degrees, calculate the refractive index of the material
By Brewster's law, refractive index = tan(polarizing angle) = tan(49) = 1.15.
The period of a S.H.M is 1.20 sec when the length of the pendulum is 40cm, find the period when the length is Increased to 90cm
Period is proportional to the square root of length: T2 = 1.20 x sqrt(90/40) = 1.20 x 1.5 = 1.80s.
Which of the following statements is not correct about the image formed by a pin-hole camera? It is Always
A pinhole camera image is not always magnified - it can be smaller than the object depending on the relative distances, making this the incorrect (NOT always true) statement.
Which of the following devices is not based on the motor effect?
A hot-wire ammeter works on the heating effect of current, not the motor (force on a current-carrying conductor) effect.
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