Physics Past Questions And Answers
Which of the following is not true of the similarities between a camera and the human eye?
- A. Both the camera and the human eye have light proof interiors
- B. Both the camera and the human eye have light sensitive screens
- C. Inverted images are formed on the screen in both
- D. The distance between the lens and the screen is fixed in both
(a) State two objects each used in sports and warfare which may be considered as projectiles.
(b) the horizontal range R, of a projectile is given by the expression;
R = \(\frac{u^2 sin 2\theta}{g}\) where \(\theta\) is the angle of projection, g the acceleration of free fall due to gravity and u the initial velocity. At what value of \(\theta\) will R be maximum?
View Discussion (0)WAEC 2003 THEORYA boy walks away from a plane mirror at a speed of 3 ms-1 in a direction normal to the surface of the mirror. At what speed is his image approaching him?
- A. 8 9.0ms-1
- B. 6.0ms-1
- C. 4.5ms-1
- D. 1.5ms-1
An object is placed 15cm from a diverging lens of focal length 12cm. The image of the object formed by the lens in
- A. real and 6.67cm from the lens
- B. virtual and 6.67cm from the lens
- C. real and 60.00cm from the lens
- D. virtual and 60.00cm from the lens
In a discharge tube, most of the gas is pumped out so that electricity is conducted at
- A) low voltage
- B) steady voltage
- C) high pressure
- D) low pressure
(a) In the design of an optical fibre, what type of material is most suitable for the design of the core?
(b) State one condition necessary to confine signals to the core of an optical fibre.
View Discussion (0)WAEC 2020 THEORYA mass of 11.0 kg is suspended from a rigid support by an aluminum wire of length 2.0 m, diameter 2.0 mm and Young's modulus 7.0 x 10\(^{11}\) Nm\(^{-2}\). Determine the extension produced. [g = 10 ms\(^{-2}\); \(\pi\) = 3.142]
View Discussion (0)WAEC 2013 THEORYElectrical resistance is the property of an electrical conductor that causes electrical energy to be converted into
- A. mechanical energy
- B. solar energy
- C. heat energy
- D. magnetic energy
A metal rod has a length of 100cm at 200oC. At what temperature will its length be 99.4cm. If the linear expansivity of the material of the rod is 2 x 10−5C−1
- A. 200oC
- B. 300oC
- C. 100oC
- D. -100oC
(a) Define isotopes.
(b) Mention two uses of radioactive tracers in each of the following areas:
(\(\alpha\)) medicine
(\(\beta\)) industry
(\(\gamma\)) agriculture.
(c) State three features of electromagnetic waves.
(d)) Mention four components of the nuclear reactor.
(i) State the functions of each of the components stated in (d)(i).
View Discussion (0)WAEC 2020 THEORY