Waec 2000 Physics Past Questions And Answers
A machine of efficiency 8% is used to raise a body of mass 75kg through a vertical height of 3m in 30s. Calculate the power input. (g = 10ms-2)
- A. 9.4W
- B. 60.0W
- C. 75.0W
- D. 93.8W
A proton of wavelength \(\lambda_o\) is emitted when an electron in an atom makes a transition from a level of energy 2E. If the electron transits from \(\frac{4}{3}E_k\) to E level, determine the wavelength of the photon that would be emitted
- A. 3\(\lambda_o\)
- B. 2\(\lambda_o\)
- C. \(\frac{3}{4}\)\(\lambda_o\)
- D. \(\frac{1}{3}\)\(\lambda_o\)
Two bodies P and Q, are in thermal equilibrium, which of the following statements about the bodies is correct?
- A. the temperature of Q is higher than that of P
- B. P and Q have the same heat capacity
- C. P and Q have the same mass
- D. P and Q are at the same temperature
Absorption line spectra exhibited by atoms is a result of
- A. change in the kinetic energy of a movimg atom
- B. instability of the nucleons
- C. excitation of an electron in the atom
- D. transition of an electron from a higher to a lower energy level
A force of 40 N is applied at the end of a wire 4m long and produces an extension of 0.24mm. If the diameter of the wire is 2.00mm, calculate the;
(i) stress on the wire; (ii) strain in the wire.
The cubic expansivity of mercury is 1.8 x 10-4K-1 and the linear expansivity of glass 8.0 x 10-6K-1, calculate the apparent expansivity of mercury in a glass container
- A. 1.00 x 10-4K-1
- B. 1.56 x 10-4K-1
- C. 1.72 x 10-4K-1
- D. 2.04 x 10-4K-1
What is a projectile? Give four examples of projectiles in everyday life
The duality of matter implies that matter
- A. exists as a particle of dual composition
- B. has momentum and energy
- C. has both wave and particle properties
- D. is made up of dual materials
In the diagram below, the current passing through the 6Ω resistor is 1.5A. Calculate the current in the 30Ω resistor
- A. 1.20A
- B. 0.90A
- C. 0.75A
- D. 0.60A
The resultant of two forces acting on an object is maximum when the angle between them is?
- A. 180°
- B. 90°
- C. 45°
- D. 0°