Physics JAMB, WAEC, NECO AND NABTEB Official Past Questions

(a) Explain the following terms:

(i) viscosity;

(ii) terminal velocity.

(b)(i) Describe an experiment to determine the terminal velocity of a steel ball falling through a jar of glycerine..

(ii) State two precautions that should be taken to ensure accurate result.

(c) State two

(i) effects of viscosity

(ii) applications of viscosity.

(a) Explain what is meant by the statement: The capacitance of a parallel-plate capacitor is 2\(\mu\)F

(b) State: (i) three factors on which its capacitance depends

(ii) three uses of capacitors.

(c) Derive a formula for the energy W stored in a charged capacitor of capacitance C carrying a charge Q on either plate.,

(d) Two parallel-plate capacitors of capacitances 2\(\mu\)F and 3\(\mu\)F are connected in parallel and the combination is connected to a 50V d.c. source. Draw the circuit diagram of the arrangement and determine the:

(i) charge on either plate of each capacitor

(ii) potential difference across each capacitor

(iii) energy of the combinad capacitors.

(a) What is meant by dispersion of white light?

(b) State the colours in the spectrum of white light in ascending order of their wavelengths

(c) Which colour is deviated.

(i) least

(ii) most?

(d) Explain why white light is dispersed when it passes through a glass prism.

(e) Describe, with the aid of a labelled diagram, how a pure spectrum of white light can be produced on a screen.

(a) Define the apparent cubic expansivity of a liquid

(b)(i) Describe with the aid of a labelled diagram, an experiment to determine the apparent cubic expansivity of a liquid.

(ii) State two precuations that should be taken to ensure accurate results.

(c) A density glass bottle contains 44.25g of a liquid at 0°C and 42.02g at 50°C. Calculate the real cubic expansivity of the liquid. (Linear expansivity of glass = 1.0 x 10-5K\(^{-1}\))

The count rate of an alpha-particle source is 400 per minute. If the half-life of the source is 5 days, what would be the count rate per minute after 15 days?

Which of the following particles/rays do not originate from the nucleus of an atom?

Which of the following is used in a nuclear reactor to slow down fast-moving neutrons?

Which of the following is used in a nuclear reactor to slow down fast-moving neutrons?

Which of the following is not part of the electromagnetic spectrum?

Which of the following substances is most viscous at room temperature?

What is the decay constant of a radioactive element whose half-life is 3 seconds

The resistance in a series R-C circuit is 5 Ω. If the impedance of the circuit is 13 Ω, calculate the reactance of the capacitor

ln the diagram above, the resistor has a resistance 8 Ω while the reactances of the inductor and the capacitor are 10 Ω and 16 Ω respectively Calculate the current in the circuit

Calculate the amount of heat generated in an external load of resistance  8Ω if an alternating current of peak value 5A is passed through for 100s.

The electric potential at point P in the diagram above can be expressed as

The diagram above illustrates an isolated metal sphere carrying charge W in a medium whose permittivity is so. The magnitude of the electric field intensity at P can be expressed as

Soft iron is used in making the armature of an electric bell because it

A cell of e.m.f. 1.5V is connected in series with a resistor of resistance 39. A high-resistance voltmeter connected across the cell registers only 0.9V. Calculate the internal resistance of the cell

Lenz’s law of electromagnetic induction states that

A wire of length 100cm and cross-sectional area of 2.0 x 10^-3cm² has a resistance of 0.10 Ω. Calculate its electrical conductivity.

The diagram above illustrates the conversion of a galvanometer of resistance 29 to an ammeter. The galvanometer gives a full-scale deflection for a current of 10mA. Calculate the value of R.