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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.
The duality of matter implies that matter
In a nuclear reactor, electricity can be generated through the following processes. Arrange the processes in the correct order. i. The steam is used to drive turbines. ii. The heat energy released is removed by passing water through the reactor. iii. The turbines in turn generate electricity. iv. The water then passes through some form of heat exchanger to produce steam
The nucleon number and the proton number of a neutral atom of an element are 23 and 11 respectively. How many neutrons are present in the atom?
A proton of wavelength \(\lambda_o\) is emitted when an electron in an atom makes a transition from a level of energy 2E. If the electron transits from \(\frac{4}{3}E_k\) to E level, determine the wavelength of the photon that would be emitted
In which of the following transitions is the largest quantum of energy liberated by an hydrogen atom when the electron changes energy levels? [n is the quantum number]
Absorption line spectra exhibited by atoms is a result of
A material of mass 1.0 x 10\(^{-2}\)kg undergoes a fission process which decreases its mass by 0.02 percent. Calculate the amount of energy released in the process. (c = 3.0 x 10\(^{8}\)ms\(^{-1}\))
The half life of a radioactive substance is 14 days. If 48g of this substance is stored, after how many days will 1.5g of the original substance remain?
A nuclide \(^{202}_{84} Y\) emits in succession an \(\alpha-particle\) and a \(\beta-particle\). The atomic number of the resulting nuclide is
Borh's theory provides evidence for the
calculate the inductance of an inductor whose reactance is one ohm at 50 Hz.
An inductor of inductance 10H carries a current of 0.2A. Calculate the energy stored in the inductor
If a bar magnet is accidentally broken into three pieces as shown in the diagram above, the polarities of P and Q respectively, are
A device used to prevent wearing away of the make and-brake contacts of an induction coil is called a\an
The region around a magnet in which the magnetic influence is experienced is called
An immersion heater is rated 120W. How long does it take the heater to raise the temperature of 1.2kg of water by 15oC. (Assuming heat lost to the surrounding is negligible. Specific heat capacity of water = 4200 Jkg-1K-1C)
In the diagram above, the current passing through the 6\(\Omega\) resistor is 1.5A. Calculate the current in the 3\(\Omega\) resistor
The capacitance of a parallel-plate capacitor is increased by making the area of the plates
An object is situated within the Earth's gravitational field. Which of the following factor does not affect the acceleration of free fall g?
the factor which enables the ear to distinguish between a note played on different instruments is the