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NECTA Physics – Tanzania

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Question 81

Which wave property is responsible for the change in direction of a wave when it passes from one medium to another?
WavesWave Properties and Behaviourmedium

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Question 82

A resistor of 10 Ω is connected across a 12 V battery. What is the current flowing through the resistor?
ElectricityElectric Circuitsmedium

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Question 83

Which of the following materials is most likely to be a permanent magnet?
MagnetismMagnetism and Magnetic Materialseasy

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Question 84

What is the de Broglie wavelength associated with a particle of mass 9.11 × 10⁻³¹ kg moving at 2 × 10⁶ m/s? (Use Planck constant h = 6.63 × 10⁻³⁴ Js)
Modern physicsWave-Particle Dualityhard

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Question 85

What is the main energy transformation in an electric generator?
EnergyEnergy Conversion and Conservationmedium

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Question 86

During uniform circular motion, which force acts as the centripetal force on an object moving in a circle?
MechanicsCircular Motionhard

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Question 87

Which instrument is most suitable for measuring the length of a small object with high precision?
MeasurementsMeasurementseasy

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Question 88

What is the acceleration of a freely falling object near the Earth's surface ignoring air resistance?
MechanicsMechanicseasy

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Question 89

If the kinetic energy of an object doubles, by what factor does its velocity change?
EnergyEnergymedium

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Question 90

Which process explains heat transfer by the movement of fluids due to density differences?
HeatHeateasy

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