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Create and set up a CBT environment with your preferred subjects.
Practice JAMB CBT with real UTME past questions in CBT format.
CB-WASSCE styled past question practice.
SSCE & GCE styled past question practice.
Calculate the inductive reactance of the circuit shown above
A given wire of resistance 10 Ω has a length of 5 m and a cross-sectional area of 4.0 × 10\(^{-3}\) m\(^2\). Calculate the conductivity of the wire.
Calculate the current in the 3 Ω resistor in Question 47.
What is the potential difference between X and Y in the diagram above if the battery is of negligible internal resistance?
An alternating current, having a waveform shown in the diagram above, is represented by the equation X = X\(_o\) sinωt. Which of the following represents X\(_o\)?
Calculate the quantity of charge flowing through a conductor if a current of 10 A passes through the conductor for 10 s.
The effective capacitance between points X and Y in the diagram above is 1.0\(\mu\) F. What is the value of the capacitance?
The energy stored in a capacitor of capacitance 5μF is 40 J. Calculate the voltage applied across its terminals.
A capacitor of capacitance 25μF is connected to an a.c power source of frequency \(\frac{200}{π}\) Hz. Calculate the reactance of the capacitor.
If the current in the resistor R is 0.05 A, calculate the p.d across the inductor.
A series R - L - C circuit is shown in the diagram above. Which of the following vector diagrams correctly represents the phase relationship among I, V, V\(_F\), V\(_C\), and V\(_L\), if V\(_C\) is greater than V\(_L\) and the symbols have their usual meaning?
Calculate the electric potential at a distance of 20.0cm from a point charge of 0.015 C placed in air of permittivity. [ take \(\frac{1}{4\pi ε₀}\) = 9.0 x 10\(^9\)Nm\(^2\)C\(^{-2}\)]
Calculate the inductance L of the COIL in the circuit shown above
A balloon containing 546 cm\(^3\) of air is heated from 0°C to 10°C. If the pressure is kept constant, what will be its volume at 10°C?
A charge of 1.6 × 10\(^{-10}\) C is placed in a uniform electric field of intensity 2.0 × 10\(^5\) NC\(^{-1}\). What is the magnitude of the electric force exerted on the charge?
What is the escape velocity of a body on the surface of the Earth of radius R if the gravitational constant is G and the mass of the Earth is M? (Neglect energy losses to the surroundings)
A listener can detect the instrument from which a note is being sounded because different instruments produce the same note with different
An alternating voltage with a frequency of 50 Hz has a period of
The period of a wave is 0.02 seconds. Calculate its wavelength if its speed is 330 ms\(^{-1}\)
A sound note of frequency 250 Hz and a wavelength 1.3 m is produced at a point near a hill. If the echo of the sound is received 1 second later at that point, how far away is the hill from the point?