Physics Past Questions And Answers
(a) Define strain.
(b) A rubber band is stretched to twice its original length. Calculate the strain on the rubber band.
View Discussion (0)WAEC 2018 THEORYWater does not drip through an open umbrella of silk material unless the inside of the umbrella is touched. Which of the following phenomena is responsible for this?
- A. Surface tension
- B. Hydrostatic upthrust
- C. Viscosity
- D. Diffusion
An explosion occurs at an altitude of 312 m above the ground. If the air temperature is -10.00°C, how long does it take the sound to reach the ground?
[velocity of sound at 0° C = 331 ms-1]
- A. 0.94s
- B. 0.96s
- C. 0.93s
- D. 0.95s
A 40 kW electric cable is used to transmit electricity through a resistor of resistance 2.0Ω at 800 V. The power loss as internal energy is?
- A) 4.0 x 102W
- B) 5.0 x 102W
- C) 4.0 x 103W
- D) 5.0 x 103W
Which of the following simple machines is a second class lever?
- A. wheel barrow
- B. crowbar
- C. claw hammer
- D. seesae
The volume of an ideal gas at a pressure of 77cmHg and temperature 60oC is 24cm3. If the temperature and pressure are increased to 98oC
and 81cmhg respectively, calculate the new volume of the gas
- A. 411.5cm3
- B. 267.1cm3
- C. 254.2cm3
- D. 112.7cm3
The diagram below represents a portion of a micrometer screw gauge in which the horizontal scale is in millimetres. What is the reading on the instrument?
- A. 3.72mm
- B. 3.50mm
- C. 3.30mm
- D. 3.22mm
Given that v, f and \(\lambda\) are the velocity, frequency and wavelength of a wave respectively. Which of the following equations is correct?
- A. v = f2\(\lambda\)
- B. f = \(\frac{v}{\lambda}\)
- C. f = \(\frac{v}{\lambda^2}\)
- D. \(\lambda = \frac{f}{v^2}\)
If an ebonite rod is rubbed with fur
- A. both the ebonite rod and the fur will be negatively charged
- B. the ebonite rod will be positively charged while the fur will have no charge
- C. there will be electron transfer only if the ebonite rod is earthed
- D. the ebonite rod will be negatively charged while the fur will be positively charged
When light from a source is sent through a gas. i. certain wavelengths are absorbed. ii. a dark line is left. Which of the following is/are correct?
- A. i only
- B. iii only
- C. i and ii only
- D. i and iii only