Which of the following is not true of an electrical charge?
- A. Negative charge means deficit electrons
- B. Negative charge means excess of electrons
- C. electric current means movement of electrons
- D. All of the above
Which of the following is true of an electrical charge?
- A. Positive charge means deficit electrons
- B. Negative charge means excess of electrons
- C. electric current means movement of electrons
- D. All of the above
Which of the following representations is correct for an atom X with 28 electrons and 30 neutrons?
- A. \(^{58}_{28}X\)
- B. \(^{30}_{28}X\)
- C. \(^{28}_{30}X\)
- D. \(^{58}_{30}X\)
The volume of a fixed mass of gas is 10cm3 when its pressure is 400cmHg. Determine the volume of the gas when its pressure is 200cmHg.
- A. 30cm3
- B. 40cm3
- C. 50cm3
- D. 20cm3
The velocity ratio of an inclined plane where angle of inclination in θ is
- A. Sinθ
- B. Cosθ
- C. Tanθ
- D. \(\frac{1}{\sin \theta}\)
Which of the following is not a mechanical wave?
- A. wave in closed pipe
- B. radio waves
- C. water waves
- D. sound waves
Calculate the time taken for a mango fruit that fall from the tree 20 m to the ground [g = 10 ms-2]
- A. 10s
- B. 5s
- C. 4s
- D. 2s
From the diagram above, calculate the total current in the circuit
- A. 5.0A
- B. 3.7A
- C. 4.5A
- D. 4.0A
What is the cost of running seven 40 W lamps and five 80 W lamps for 12 hours of the electrical energy cost N7.00kWh?
- A. N80.00
- B. N45.36
- C. N65.00
- D. N57.12
Calculate the angle of minimum deviation of a 60º prism of a refractive index 1.5[ \(sin^{-1}\) (0.75) = 49º]
- A. 38o
- B. 19.47o
- C. 16.25o
- D. 49o
If silicon is doped with phosphorus, what type of semiconductor material will be formed?
- A. Zener material
- B. P-n junction
- C. n-type
- D. p-type
When two mirrors are placed at an angle of 90º to each other, how many images will be formed when an object is placed in front of the mirrors
- A. 5
- B. 4
- C. 3
- D. 2
The action of blotting paper on ink is due to
- A. diffusion
- B. osmosis
- C. capillarity
- D. surface tension
What is the speed of a body vibrating at 50 cyclic per second
- A. 100 πrads\(_{−1}\)
- B. 200 πrads\(_{−1}\)
- C. 50 πrads\(_{−1}\)
- D. 400 πrads\(_{−1}\)
The instrument to measure the relative density of liquid is
- A. thermometer
- B. hydrometer
- C. spring balance
- D. beaker
It is known that a neutron exists in a light atomic nucleus
Which of the following also exists in the nucleus?
- A. An electron
- B. A β - particle
- C. β - particle
- D. proton
Which of the following surfaces will absorb radiant heat energy?
- A. white
- B. red
- C. black
- D. blue
Which of the following is a semiconductor
- A. copper
- B. silicon
- C. plastic
- D. Iron
Which of the following is correct about an electric cell?
- A. Primary cell produces a large current for a long time
- B. Secondary cell has a very high internal resistance
- C. Primary cell has a very low internal resistance
- D. Secondary cell has a very low internal resistance
I. Refraction II. Interference III. Diffraction Which of the above properties are common to all waves?
- A. II and III only
- B. I, II and III
- C. I and II only
- D. I and III only
A constant force of 5N acts for 5 seconds on a mass of 5kg initially at rest. Calculate the final momentum
- A. 125kgms−1
- B. 25kgms−1
- C. 15kgms−1
- D. 0kgms−1