A particle is injected perpendicularly into an electric field, it travels along a curved path as depicted in the image above,the particle is
- A. gamma ray
- B. electron
- C. neutron
- D. proton
In the circuit diagram above, the ammeter reads a current of 3A when R is 5 ohms and 6A when R is 2ohms, the value of the unknown resistance X is
- A. 1
- B. 2
- C. 3
- D. 4
The wire X in the figure above is at right angles to the plane of the paper and carries a current into the paper. at which of the points labelled 1-4, will the magnetic flux density due to this current be in the same direction as that of the horizontal component of earth’s magnetic field
- A. 1
- B. 2
- C. 3
- D. 4
E,F and G are yellow, red and cyan transparent light filters respectively. The color of a white opaque object when viewed through the arrangement of the filters above is
- A. yellow
- B. red
- C. black
- D. blue
In the fig above, what is the angle of reflection of the ray of light at mirror M?
- A. \( 90^{\circ} \)
- B. \( 60^{\circ} \)
- C. \( 45^{\circ} \)
- D. \( 30^{\circ} \)
The fig above shows two waveforms X and Y. If the frequency of X is 30Hz what is the frequency of Y
- A. 12Hz
- B. 19Hz
- C. 60Hz
- D. 75Hz
When one arm of a U-tube manometer is connected to a gas supply, the levels of mercury in the two arms of the U-tube is shown in the figure above, if the atmospheric pressure is 76.0cm hg, the gas pressure is
- A. 62.6cm hg
- B. 72.5cm hg
- C. 79.5cm hg
- D. 85.9cm hg
the fig above shows three different ways of hanging a heavy picture from a hook. the tension in the string will be?
- A. Greatest in X
- B. Greatest in Y
- C. Greatest in Z
- D. Same in each one
the fig above shows displacement-time graphs for three different motions. which of the following statements is correct?
- A. graph 2 corresponds to the highest velocity
- B. graph 1 corresponds to zero velocity
- C. graph 3 corresponds to a particle moving in the negative x direction
- D. graph 2 corresponds to a particle moving in the positive x direction
Which of the following symbolic representations is correct for an atom X with 22 electrons and 43 neutrons?
- A. \(^{43}_{22}X\)
- B. \(^{22}_{43}X\)
- C. \(^{65}_{43}X\)
- D. \(^{65}_{22}X\)
In a certain fusion reaction, a deuteron (\(^{2}_{1}H\)) interacts with a triton (\(^{3}_{1}He\)) and produces an a-particle (\(^{4}_{2}He\)) and a second product. The second product is
- A. a proton
- B. an electron
- C. a neutron
- D. a gamma ray
A dynamo primarily combines
- A. mechanical energy into electrical energy
- B. electrical energy into kinetic energy
- C. potential energy into kinetic energy
- D. kinetic energy into potential energy
The principle of operation of an induction coil is based on
- A. Ohm's law
- B. Amphere's law
- C. Faraday's law
- D. Columbs law
Which of the following ammeters may be used to measure alternating currents? i. moving-coil ammeter ii. moving-iron ammeter iii. hot-wire ammeter
- A. i and ii only
- B. ii and iii only
- C. i and iii only
- D. i, ii, and iii
A household refrigerator is rated 200 watts. If electricity costs 5k per kWh, what is the cost of operating it in 20 days?
- A. N4.80
- B. N48.00
- C. N480.00
- D. N4800.00
When a resistance R is across a cell, the voltage across the terminals of the cell is reduced to two-third of its normal value. The internal resistance of the cell is
- A. \(\frac{2}{1}\)R
- B. \(\frac{1}{2}\)R
- C. \(\frac{3}{2}\)R
- D. 5R
A cell of internal resistance 2 ohms supplies current to a 6 ohms resistor. The efficiency of the cell is
- A. 12.0%
- B. 25.0%
- C. 33.3%
- D. 75.0%
A spectrum of sunlight is said to be impure when
- A. it is made of only three colours
- B. it has no red colour in it
- C. the different colours in it overlap
- D. it does not contain white light
Which of the following statement is TRUE of ultraviolet, visible and infra-red rays?
- A. they are all electromagnetic waves with the same wavelength
- B. ultra-violet rays have shorter wavelengths than infra-red rays and produce flourescence
- C. infrared rays have shorter wavelength than visible light and produce the sensation of heat
- D. the wavelenghts increase in the sequence: visible, ultra-violet, infra-red
When white light is dispersed by a spectrometer, the component having the shortest wavelength is
- A. orange
- B. green
- C. violet
- D. red
Which of the following phenomena explains the formation of a mirage? i. Reflection ii. Refraction iii. Diffraction
- A. i and ii only
- B. ii and iii only
- C. i and iii only
- D. i, ii, and iii only