2011 - WAEC Physics Past Questions and Answers - page 3
A metal of mass 200g at a temperature of 100oC is placed in 100g of water at 25oC in a container of negligible heat capacity. If the final steady temperature is 30oC, calculate the specific heat capacity of the metal. [specific heat capacity of the water is 4200 Jkg-1 K-1]
Ether produces a cooling effect when it is poured on the hand because it has
Which of the following statements about the image formed by a plane mirror is not correct?
The image formed by a convex mirror is always
A ray undergoes a minimum deviation at 40o when it is incident on equilateral triangular glass prism. Calculate the refractive index of the prism
Total internal reflection occurs in an optical prism when light rays
The speed of light in a certain medium is V while its speed in a vacuum is C. The absolute refractive index of the medium is
An object is placed 20.0cm in front of a converging lens of focal length 15.0cm. Calculate its image distance
Presbyopia is a defect of the eye resulting from
The focal length of the eye-piece of an astronomical telescope is f1, while the focal length of the object is f2. Fro normal adjustment, the angular magnification is given by