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waec-physics-2020

6 followers

48 questions


A parallel plate capacitor is charged and the changing batte...
A parallel plate capacitor is charged and the changing battery subsequently disconnected. If the plates of the capacitor are moved father apart by means of i...
2 months ago 1 answer(s) 2 votes


A beam consists of α-particles, β-particles and -...
A beam consists of α-particles, β-particles and -rays pass through a magnetic field at right angles to the direction of the fiels. Which of the fo...
2 months ago 1 answer(s) 2 votes


A moving-coil galvanometer which gives a full-scale deflecti...
A moving-coil galvanometer which gives a full-scale deflection with 0.005A is converted to a voltmeter, reading up to 5V using an external resistance of 975&...
2 months ago 1 answer(s) 3 votes


The length of an iron bar is 100 cm at 20oC. At what texpera...
The length of an iron bar is 100 cm at 20oC. At what texperature will its length increase by 0.01% ? [Linear expansivity of iron = 1.2 x 1...
2 months ago 1 answer(s) 3 votes


A 60kg man stands on a weighing balance in an elevator. If t...
A 60kg man stands on a weighing balance in an elevator. If the elevator accelerates upwards at 5ms-2, determine the reading of the scale. [g = 10m...
2 months ago 2 answer(s) 3 votes


A ray of light travelling from glass into ethyl alcohol is i...
A ray of light travelling from glass into ethyl alcohol is incident at the boundary at an angle of incidence 30o. Calculate the angle of refractio...
2 months ago 2 answer(s) 2 votes


The earpiece of a telephone handset converts energy from A....
The earpiece of a telephone handset converts energy from A. electrical to sound B. sound to electrical C. radiowave to sound ...
2 months ago 2 answer(s) 4 votes


An electrical device has 50 turns in its primary coil and 20...
An electrical device has 50 turns in its primary coil and 20 turns in the secondary coil. The device can be a/an A. step-up transformer B. st...
2 months ago 1 answer(s) 2 votes


Which of the following statements explains why hot soapy wat...
Which of the following statements explains why hot soapy water is more effective in cleaning oil-stained dishes? A. The oil on ...
2 months ago 1 answer(s) 2 votes


The material used to slow down the neutrons in a nuclear rea...
The material used to slow down the neutrons in a nuclear reactor is A. boron B. copper C. graphite D. uranium
2 months ago 1 answer(s) 2 votes