Waec 1999 Physics Past Questions And Answers
An iron rod of length 50m and at a temperature of 60oC is heated to 70oC. Calculate its new length. (Linear expansivity of iron = 1.2 x 10-5K-1)
- A. 50.006m
- B. 50.060m
- C. 51.600m
- D. 51.200m
The real image of an object formed by a converging lens of focal length 15cm, is three times the size of the object. Calculate the object distance
- A. 60cm
- B. 30cm
- C. 20cm
- D. 15cm
The temperature of a piece of metal of mass 9 g is raised from 10oC to 110oC when it absorbs 108J of heat energy. Determine the specific heat capacity of the metal in J kg-1K-1
- A. 1.2
- B. 12.0
- C. 120.0
- D. 1200.0
A ray of light is incident on 'a plane mirror at an angle of 20°. This mirror is rotated through, twice this angle, In this new position the angle between the incident ray and the reflected ray is
- A. 20°
- B. 40°
- C. 80°
- D. 120°
(a) List two types of waves, apart from light, that can be plane polarised
(b) State two applications of plane polarised light.
View Discussion (0)WAEC 1999 THEORYWhich of the following statements is not correct?
- A. A sea breeze is due to convection in air
- B. Cotton materials are better than woollen ones for use in hot weather
- C. Convectional currents play an important role in the cooling of the engine of a motor car
- D. The vacuum space in a flask helps to reduce heat loss by radiation.
A stone is projected horizontally from the top of a tower with a speed of 5ms-1. It lands on the ground level at a horizontal distance of 20m from the foot of the tower. Calculate the height of the tower. (g = 10ms\(^{-2}\))
View Discussion (0)WAEC 1999 THEORY.jpg)
Which of the following statements about evaporation is not correct?
- A. The rate of evaporation of a liquid varies with temperature
- B. The molecules of an evaporating liquid have an average speed
- C. Evaporation occurs when faster molecules escape from the surface of a liquid
- D. Evaporation takes place inside a liquid.
I. All elements emit and absorb characteristic spectra. II. Spectral analysis is an important method of identifying environmental pollutants. III. The chemical composition of stars could be determined using spectral analysis. Which of the statements above are correct?
- A. I, II and III
- B. II and III only
- C. I and III only
- D. I and II only
A 15kg mass, suspended from a ceiling, is pulled aside with a horizontal force, F, as shown in the diagram below. Calculate the value of the tension, T. (g = 10ms-2)
- A. 300.0N
- B. 173.2N
- C. 30.0N
- D. 17.3N