Physics Past Questions And Answers
Which of the following types of thermometers can be used to measure a range of temperature from -50°C to 50°C? i. Clinical ii. Mercury iii. Alcohol-in-glass
- A. i only
- B. ii only
- C. iii only
- D. i and ii only
The pair of physical quantities consisting of vectors only are
- A. momentum and power
- B. velocity and distance
- C. displacement and torgue
- D. accelaration and speed
An electron of mass 9.1 x 10\(^{-31}\) kg moves with a speed of 2.0 x 10\(^6\) ms\(^{-1}\) round the nucleus of an atom in a Circular path of radius 6.1 x 10\(^{11}\) m. Determine the angular speed of the electron.
- A. 3.28 x 10\(^{16}\) rad s\(^{-1}\)
- B. 8.55 x 10\(^{3}\) rad s\(^{-1}\)
- C. 9.11 x 10\(^{13}\) rad s\(^{-1}\)
- D. 5.22 x 10\(^{15}\) rad s\(^{-1}\)
The expansion of solids can be considered a disadvantage in the
- A. fire alarm system
- B. thermostat
- C. riveting of steel plates
- D. balance wheel of a watch
From Newton's first law of motion,
- A. a body can only undergo translational motion
- B. once a body remains at rest no force acts on it
- C. the net force acting in uniform linear motion is zero
- D. a body's inertia is its weight
Capacitors are used in the following devices, except
- A. water pumping machines
- B. ceiling fans
- C. electric irons
- D. television sets
Which of the following equations is the correct definition of the reactance of an indicator L?
- A. Reactance = (Amplitude of voltage) ÷ (Amplitude of current)
- B. Reactance = (Amplitude of voltage) x (Amplitude of current)
- C. Reactance = (Amplitude of current)2 ÷ (Amplitude of voltage)
- D. Reactance = (Amplitude of current)2 ÷ (Amplitude of voltage)\(\frac{1}{2}\)
An electric lamp is rated 240V, 40W. What is the cost of running the lamp for 72 hours if the electricity authority charges N2.50 per kWh?
- A. N7.20
- B. N18.00
- C. 180.00
- D. N720.00
Which of the following statements about wave is not correct? i. A wavefront is a line which contains all particles whose vibration are in phase. ii. The direction of propagation of a wave is the link drawn parallel to the wavefront. iii. A wavefront is a circle which is common to particles that are in the same state of disturbance
- A. i only
- B. ii only
- C. i and ii only
- D. ii and iii only
A projection lantern is used to give the image of a slide on a screen. If the image is 24 times as large as the slide and the screen is 72.0m from the projecting lens, what is the position of the slide from the lens?
- A. 0.3m
- B. 3.0m
- C. 3.5m
- D. 4.0m