Physics Past Questions And Answers
Light is considered as a transverse wave because it travels
- A. through material without causing disturbance of the medium
- B. through space with constant speed
- C. in a direction parallel to the plane containing the electric and magnetic fields
- D. in a direction perpendicular to the plane containing the electric and magnetic fields
At what respective values of X, Y and Z would the unit of force, the newton, be dimensionally equivalent to MxLyTz?
- A. -1, 1, 2
- B. 1, 1, -2
- C. 1, -1, 2
- D. -1, 1, -2
The resistances of platinum wire at the ice and steam points are 0.75 ohm and 1.05 ohm respectively. Determine the temperature at which the resistance of the wire is 0.90 ohm
- A. 43.0oC
- B. 50.0oC
- C. 69.9oC
- D. 87.0oC
If the frequency of an emitted x-ray is 1.6 x 1016Hz, the accelerating potential is? [e = 1.6 x 10-19C, h = 6.63 x 10-34Js]
- A. 6630.0V
- B. 663.0V
- C. 66.3V
- D. 6.6V
Which of the following does Not use magnetic effect of current to function?
- A. Lead acid accumulator
- B. An electric bell
- C. A moving coil galvanometer
- D. A telephone receiver
In a purely inductive circuit, the current
- A. lags behind the voltage in phase by 90°
- B. leads the voltage in phase by 90°
- C. is in the same phase with the voltage
- D. leads the voltage by 180°
An element X of an atomic number 88 and mass number 226 decays to form an element Z by emitting two beta particles and an alpha particle. Z is represented by
- A. \(^{222}_{82}Z\)
- B. \(^{222}_{88}Z\)
- C. \(^{226}_{86}Z\)
- D. \(^{226}_{80}Z\)
A steel wire of length 0.50m is stretched between two fixed points and its fundamental frequency is 200Hz. The speed of the wave in the wire is
- A. 100ms-1
- B. 120ms-1
- C. 200ms-1
- D. 250ms-1
(a) On what principle does lighting in a fluorescent tube operate?
(b) State two factors which determine the colour of light produced in a fluorescent tube.
View Discussion (0)WAEC 2012 THEORYWhich of the following is an example of a couple?
- A. All of the above.
- B. The forces that are applied to the handle of a screwdriver when you twist it.
- C. The forces that are applied to a cross wench to loosen or tighten the lug nuts on a wheel of a car.
- D. The forces that are applied to the steering wheel of a car when you turn it.