Physics Past Questions And Answers
An object is placed 10cm in front of a plane mirror. If it is moved 8cm away father away from the mirror, determine the distance of the final image from the mirror
- A. 2cm
- B. 9cm
- C. 16cm
- D. 18cm
If the pressure of the vapour on top of an enclosed liquid is equal to the atmospheric pressure, what will be the temperature of the liquid enclosed?
- A) room temperature
- B) boiling point
- C) freezing point
- D) standard temperature
The diagram below illustrates the mercury-in-glass thermometer used for determining the temperature of a room. Use the data on it to determine the room temperature.
- A. 3.3°C
- B. 7.0°C
- C. 13°C
- D. 30.0°C
A battery of e.m.f. 12.0V and internal resistance0.5\(\Omega\) is connected to 1.5\(\Omega\) and 4.0\(\Omega\) series resistor. Calculate the terminal voltage of the battery.
- A. 13.0V
- B. 11.0V
- C. 3.0V
- D. 1.0V
When a metal ball is heated through 30oC,its volume becomes 1.0018cm3. If the linear expansivity of the material of the ball is 2.0 x 10-5 K-1, calculate its original volume
- A. 1.0000cm3
- B. 1.0020cm3
- C. 1.0036cm3
- D. 1.0180cm3
(a)(i) What is meant by the root-mean-square value of an alternating current? (ii) Define impedance of an alternating current circuit.
(b) An electrical device rated 120 V, 60 W is opened on a 240 V, 50Hz mains supply. The circuit has a capacitor connected in series with ihe electrical device and the supply. Calculate the capacitance of the capacitor. [π=3.142].
(c)(i) Define the capacitance of a capacitor.
(ii)
.The circuit diagram below illustrates two capacitors of capacitance C\(_1\) and C\(_2\) connected in series across a 2V source.
(i)Obtain an expression for the total capacitance in terms of C\(_2\). 2 mm 5 n (ii) Calculate the potential difference across each capacitor.
View Discussion (0)WAEC 2021 THEORYState three methods of polirizing an unpolarized light
View Discussion (0)WAEC 2009 THEORYThe acceleration of the system show below is
- A. 2ms-2
- B. 4ms-2
- C. 6ms-2
- D. 8ms-2
Which of the following sets of quantities is fundamental?
- A. length, mass and time
- B. speed, length and time
- C. speed, mass and distance
- D. distance, speed and time
A force of 40 N applied at the end of a wire of length 4m and diameter 2.00 mm produces an extension of 0.24 mm. Calculate the;
(a) stress on the wire;
(b) strain in the wire (\(\pi = 3.142\))
View Discussion (0)WAEC 2003 THEORY