Past Questions And Answers
The table shows the distribution of the lengths of 20 iron rods measured in metres :
| Length (m) | 1.0 - 1.1 | 1.2 - 1.3 | 1.4 - 1.5 | 1.6 - 1.7 | 1.8 - 1.9 |
| Frequency | 2 | 3 | 8 | 5 | 2 |
Using an assumed mean of 1.45, calculate the mean of the distribution.
View Discussion (0)WAEC 2014 THEORY(a) Explain the terms:
(i) thermal equilibrium;
(ii) fundamental interval.
(b) List two uses of the hydraulic press.
(c) Name the material used to reset the steel index in the Six's maximum and minimum thermometer.
(d)(i) A nursing mother prepared her baby's milk mixture at 85°C, in a feeding bottle. In order to cool it to 40°C, she immersed the bottle in an aluminium bowl of heat capacity 90 JK\(^{-1}\) containing 500 g of water at 26°C. If the mass of the mixture is 300g, calculate the specific heat capacity of the mixture. [Neglect heat losses and heat capacity of the bottle; specific heat capacity of water = 4200 J kg\(^{-1}\) K\(^{-1}\)]
(ii) (\(\alpha\)) Name two ways through which the bottle losses heat.
(\(\beta\)) Name two industrial processes in which heat exchanger is used.
View Discussion (0)WAEC 2016 THEORYAn alternating current with a peak value of 5A passes through a resistor of resistance 10Ω. Calculate the rate at which energy is dissipated in the resistor
- A. 250W
- B. 125W
- C. 50W
- D. 35.4W
The borrowing rights of a member country of the international Monetary Fund are determined by?
- A. the seriousness of the country's economic problems
- B. its balance of payments position
- C. its quota to the fund
- D. the size of gold reserve
Which of the following organelles is common to both plant and animal cells
- A. Cellulose cell wall
- B. Chlorophyll
- C. Cell membrane
- D. Large vacuole
P varies inversely as the square of W. When W = 4, P = 9. Find the value of P when W = 9
- A. 729/16
- B. 6
- C. 4
- D. 16/9
Identify six features of a parliamentary system of government.
View Discussion (0)WAEC 2007 THEORYDuring wave actions, the rush of water onshore is called
- A. longshore drift
- B. swash
- C. underlow
- D. backwash
A broiler starter feed should contain
- A. high protein but low carbohydrate content
- B. low protein but high carbohydrate content
- C. low protein and carbohydrate content
- D. high protein and carbohydrate content
The fundamental frequency of vibration of a sonometer wire may be halved by
- A. doubling the length of the wire
- B. doubling the mass of the wire
- C. reducing the tension by half
- D. reducing the absolute temperature by half