Physics 2011 Waec Past Questions and Answers

Question 21 :

• WAEC 2011

A body is pulled over a distance of 500m by a force of 20N. If the power developed is o.4 kW, calculate the time interval during which the force is applied

A. 0.2s
B. 2.5s
C. 25.0s
D. 250.0s

Question 22 :

• WAEC 2011

A metal of mass 200g at a temperature of 100^oC is placed in 100g of water at 25^oC in a container of negligible heat capacity. If the final steady temperature is 30^oC, calculate the specific heat capacity of the metal. [specific heat capacity of the water is 4200 Jkg^-1 K^-1]

A. 150 Jkg^-1K^-1
B. 300 Jkg^-1K^-1
C. 320 Jkg^-1K^-1
D. 1960 Jkg^-1K^-1

Question 23 :

• WAEC 2011

Ether produces a cooling effect when it is poured on the hand because it has

A. Low conductivity
B. High conductivity
C. High latent heat of vaporization
D. Low latent heat of vaporization

Question 24 :

• WAEC 2011

Which of the following statements about the image formed by a plane mirror is not correct?

A. It is laterally inverted
B. It has unit magnifiation
C. It is formed by actual intersection of rays
D. Its distance from the mirror is equal to that of the object from the mirror

Question 25 :

• WAEC 2011

The image formed by a convex mirror is always

A. Real, erect and diminished
B. Real, inverted and diminished
C. Virtual, inverted and diminished
D. Virtual, erect and diminshed