Waec 2013 Physics Past Questions And Answers
Which of the following types of thermometer is used for the calibration of other thermometers?
- A. liqud-in-glass thermometer
- B. constant volume gas thermometer
- C. optical pyrometer
- D. thermocouple
Images formed by a convex mirror are always
- A. magnified
- B. behind the mirror
- C. real
- D. inverted
The magnitude of the expansion or contraction of a substance depends on the i. temperature change ii. nature of the substance iii. size of the substance. Which of the statements above are correct?
- A. i and ii only
- B. ii and iii only
- C. i and iii only
- D. i, ii and iii
When salt is dissolved in water, the freezing point of the water
- A. increases
- B. decreases
- C. remains the same
- D. increases and later decrease
Name one use of 'LASER' in each of the following areas:
(a) communication;
(b) medicine;
(c) security
Highly polished silvery surfaces are
- A. poor absorbers and poor emitters of radiation
- B. poor absorbers and good emitters of radiation
- C. good absorbers and poor emitters of radiation
- D. good absorbers and good emitters of radiation
The horizontal component of the initial speed of a particle projected at 30° to the horizontal is 50 ms\(^{-1}\). If the acceleration cf free fall due to gravity is 10ms\(^{-2}\), determine its: (a) initial speed; (b) speed at maximum height reached.
Ice of mass 10g at 5°C was completely converted to water at 0°C, calculate the quantity of heat used. [specific heat capacity of ice = 2.1 Jg\(^{-1}\)K\(^{-1}\), specific latent heat of fusion of ice = 336 Jg\(^{-1}\)]
- A. 105J
- B. 3255J
- C. 3465J
- D. 16821J
Which of the following particles are termed nucleons in a neutral atom?
- A. protons and neutrons
- B. neutrons and electrons
- C. protons and electrons
- D. protons, electrons and neutrons
A body of mass 20g projected vertically upwards in vacuum returns to the point of projection after 1.2s. [g = 10ms-2]. Determine the potential energy of the body at the maximum height of its motion
- A. 0.36J
- B. 0.72J
- C. 360.00J
- D. 720.00J