In the curve above, PQRST represents an alternating voltage of frequency 50Hz. The time interval between points P and R on the graph is
- A. 25s
- B. 1/50s
- C. 1/100s
- D. 1/200s
In the circuit diagram above, calculate the current in the 12 Ω resistor if the cell has an emf of 12V and an internal resistance of 1Ω
- A. 0.8A
- B. 1.0A
- C. 1.6A
- D. 2.4A
In the fig above, XY is of length 1m, The value of R at balance point Z is
- A. 3.0Ω
- B. 13.3Ω
- C. 15.0Ω
- D. 30.0Ω
In the fig above if the atmospheric pressure is 760mm, the pressure of the chamber G is
- A. 660mm
- B. 690mm
- C. 830mm
- D. 860mm
The fig above shows a uniform wood of weight 200Nand length 50m. It is pivoted at one end and suspended by a cord at the other end at an angle of 30 degrees to the wood. calculate the tension in the cord if the wood is horizontal
- A. 10N
- B. 20N
- C. 100N
- D. 200N
What is the reading of the vernier calipers shown above
- A. 1.79cm
- B. 1.73cm
- C. 1.39cm
- D. 1.34cm
A spring of length 25cm is extended to 30cm by a load of 150N attached to one of its end, what is the energy stored in the spring?
- A. 3750J
- B. 2500J
- C. 3.75J
- D. 2.50J
If light with photon energy 2eV is incident suitably on the surface of a metal with work function 3eV, then
- A. no electron will be emitted
- B. the few electrons emitted will have a maximum kinetic energy of 1eV
- C. the few electrons emitted will have a maximum kinetic energy of 3eV
- D. many electrons will be emitted
A certain radioisotope of \(^{235}_{92}U\) emits four alpha particles and three beta particles. The mass number and the atomic number of the resulting elements respectively are
- A. 219 and 87
- B. 84 and 223
- C. 223 and 87
- D. 219 and 81
If two parallel conductors carry currents flowing in the same direction, the conducts will
- A. attract each other
- B. repel each other
- C. both move in the same direction
- D. have no effect on each other
Which of the following are found in the receiver but not in the microphone of a telephone handset? i. Diaphragm. ii. soft iron pole pieces. iii. permanent magnet. iv.carbon blocks
- A. i and ii
- B. i and iv
- C. ii and iii
- D. iii and iv
Two capacitors R1 = 4\(\Omega\) and R2 = 5\(\Omega\) are connected in parallel across a potential difference. If P1 and P2 represent power dissipated in R 1 and R2 respectively, then the ratio P1 : P2 is
- A. 4 : 5
- B. 5 : 4
- C. 16 : 25
- D. 25 : 16
A capacitor 8\(\mu\)F is charged to a potential difference of 100V. The energy stored by the capacitor is
- A. 1.0 x 104J
- B. 8.0 x 10J
- C. 1.25 x 10J
- D. 4.0 x 10-2J
When a biro pen rubbed on a dry silk cloth is moved very close to a piece of paper on a dry table, the pen is found to pick up the paper. This is because
- A. both the pen and the cloth are magnetized
- B. the pen is magnetized but the cloth is not
- C. the pen is charged while the cloth is magnetized
- D. both the pen and the cloth are charged
Which of the following has the lowest internal resistance when new?
- A. leclanche cell
- B. Daniel cell
- C. Accumulator
- D. Torch battery
If the Nigeria flag (green, white, green) is viewed in pure yellow light, which of the following set of colours would be observed on the flag?
- A. Green, yellow, green
- B. Red, yellow, red
- C. black, yellow, black
- D. Green, white, green
In a projection lantern of focal length f, the object distance u, is such that
- A. u > 2f > f
- B. u < f < 2f
- C. u = f < 2f
- D. f < u < 2f
An object is placed directly below a glass block of thickness 3.0cm. Calculate the lateral displacement of the object if the refractive index of the glass is 1.5.
- A. 1.0cm
- B. 1.5cm
- C. 2.0cm
- D. 2.5cm
An object is placed in front of a converging lens of a focal length 20cm. The image is virtual and has a magnification of 2. What is the distance of the object from the lens?
- A. 5cm
- B. 10cm
- C. 30cm
- D. 40cm
Light of frequency 6.0 x 1014 Hz travelling in air is transmitted through glass or refractive index 1.5. Calculate the frequency of the light in the glass
- A. 4.0 x 1014Hz
- B. 6.0 x 1014Hz
- C. 7.5 x 1014Hz
- D. 9.0 x 1014Hz
To produce a parallel beam of light from a concave mirror, the distance at a which the lamp should be placed from the mirror is equal to
- A. the focal length
- B. two times the focal length
- C. the distance of the image
- D. two times the radius of curvature