Question 1A 15µF capacitor is connected to a 240V, 50Hz a.c source. Calculate the reactance of the capacitor. [π = 3.142]A.16ΩB.68ΩC.106ΩD.212ΩObjective Show full explanation
Question 2In a school compound a girl walks 40m due east from the laboratory to the staff room to submit her report. Then she returns and walks 30m due north to her classroom. Determine the magnitude of her displacement from the laboratory.A.10mB.35mC.50mD.70mObjective Show full explanation
Question 3A bullet fired vertically upwards reaches a height of 500m. Neglecting air resistance, calculate the magnitude of the initial velocity of the bullet. [g = 10ms-2]A.500.00ms-1B.100.00ms-1C.70.0ms-1D.50.0ms-1Objective Show full explanation
Question 4Two strings each inclined at an angle of 30° to the horizontal are used to hold a bucket of water weighing 20N. Calculate the tension in each string..A.20√3NB.20NC.10√3ND.10NObjective Show full explanation
Question 5The pressure applied to an enclosed fluid to one and is transmitted equally througout the fluid and to the container walls. This statement isA.Archimede's principleB.Bernoulli's principleC.Pascal's principleD.Heisenberg's uncertainty principleObjective Show full explanation
Question 6A device that converts mechanical energy into electrical energy isA.a dynamoB.an electric motorC.an induction coilD.a transformerObjective Show full explanation
Question 7When an air-column is set into vibrations, the distance between two consecutive nodes of the resultant wave isA.one-quarter of the wavelengthB.one-half of the wavelengthC.the wavelengthD.twice the wavelengthObjective Show full explanation
Question 8In the wiring of houses, the fuse is connected to the wire colouredA.blueB.brownC.yellowD.yellow and greenObjective Show full explanation
Question 9The pitch of a note is not affected byA.frequencyB.tension in a vibrating stringC.mass of a vibrating stringD.amplitude of sound waveObjective Show full explanation
Question 10A solid of mass 0.5kg initially at 50°C melts 60°C. Calculate the quantity of heat required to melt it completely.[Specific heat capacity of the solid = 2.0 kjkg-1K-1][Specific latent heat of fusion of solid = 1.0kJ kg-1]A.1500JB.10000JC.10500JD.15000JObjective Show full explanation