Physics Past Questions And Answers
A quantity of water at 0°C is heated to about 30°C. At each degree rise in temperature, its density will
- A. rise steadily
- B. fall steadily
- C. fall then rise
- D. rise then fall
The diagram below represents the field pattern obtained by bringing the poles of two magnets together.The poles must be
- A. S-S poles
- B. S-N poles
- C. N-S poles
- D. N-N poles
The diagram below illustrates the conversion of a galvanometer of resistance 29 to an ammeter. The galvanometer gives a full-scale deflection for a current of 10mA. Calculate the value of R.
- A. 2.0 x 103 Ω
- B. 2.0 x 102 Ω
- C. 2.0 x 10-1 Ω
- D. 2.0 x 10-3 Ω
(a) State Heisenberg's Uncertainty Principle.
(b) State one phenomenon that can only be explained in terms of the wave nature of light.
View Discussion (0)WAEC 2008 THEORYAn electric kettle with negligible heat capacity is rated at 2000W. If 2.0kg of water is put in it, how long will it take the temperature of water to rise from 20OC to 100OC? [specific heat capacity of water = 4200Jkg-1k-1]
- A. 420s
- B. 336s
- C. 168s
- D. 48s
Two plane mirrors are inclined to each other such that an object placed between them has 11 images. Determine the angle of inclination
- A. 30°
- B. 45°
- C. 60°
- D. 90°
In comparing the camera and the human eye, the film of the camera function as the
- A) retina
- B) iris
- C) cornea
- D) pupil
An electric bulb is rated 60W, 220V. Calculate the resistance of its filament when it is operating normally
- A. 296.7Ω
- B. 400.0Ω
- C. 512.2Ω
- D. 806.7Ω
A short chain is usually attached to the back of a petrol tanker and trailing behind it so that the
- A. petrol tanker is balanced on the road
- B. heat generated by friction in the engine can be conducted to the earth
- C. charges generated by friction in the tanker are conducted to the earth
- D. tanker can move slowly as the chain touches the road surface
A ray of light is incident at an angle of 30° on a glass prism of refractive index 1.5. Calculate the angle through which the ray is minimally deviated in the prism. (The medium surrounding the prism is air)
- A. 10.5°
- B. 19.5°
- C. 21.1°
- D. 38.9°