The lead-acid accumulator consists of
- A. lead as the positive electrode
- B. lead acid as the negative electrode
- C. hydrochloric acid as the electrolyte
- D. tetraoxosulphate (vi) acid as the electrolyte
A metal rod has a length of 100cm at 200°C. At what temperature will its length be 99.4cm. If the linear expansivity of the material of the rod is 2 × 10\(^{-5}\)C\(^{-1}\)
- A. \(300^0C\)
- B. \(200^0C\)
- C. \(100^0C\)
- D. \(-100^0C\)
The momentum of a car moving at a constant speed in a circular track
- A. can be both positive and negative
- B. can be zero depending on its position in the track
- C. can be zero depending on its inertia in the track
- D. a centrifugal
A force of 6N acts horizontally on a stationary mass of 2kg for 4s. The kinetic energy gained by the mass is _________
- A. 366j
- B. 240j
- C. 144j
- D. 90j
According to kinetic molecular model, in gases
- A. The particles are closely packed together, they occupy minimum space & are usually arranged in a regular pattern
- B. The particles occur in clusters with molecules slightly farther apart
- C. The molecule are very fast apart & occupy all the space made available
- D. The particle vibrate about fixed positions and are held together by the strong intermolecular bonds between them
The following are parts of the eye
I. Retina
II. Pupil
III. Iris
The correct equivalent in the camera in the same order are
- A. Diaphragm, Aperture, film
- B. Aperture, Diaphragm, Film
- C. Film, Diaphragm, Aperture
- D. Film, Aperture, Diaphragm
The earth’s gravitational field intensity at its surface is about
(G = 6.7 × 10\(^{-11}\)Nm\(^2\)/kg\(^2\), mass of the earth is 6 × 10\(^{24}\)kg, radius of the earth is 6.4 × 10\(^6\)m, g on the earth = 9.8m/s\(^2\))
- A. 6.7N/kg
- B. 7.9N/kg
- C. 8.0N/kg
- D. 9.8N/kg
Which of the following media allow the transmission of sound waves through them?
I. air
II. liquid
III. solids
- A. I & II only
- B. I & III only
- C. II & III only
- D. I, II & III
The conductivity of gases at low pressure can be termed as
I. hot cathode emission
II. thermo ionic emission
III. cold cathode emission
IV. Field emission
- A. I & II
- B. II & III
- C. III & IV
- D. IV & V
In the molecular explanation of conduction, heat is transferred by the
- A. Free electrons
- B. Free atoms
- C. Free molecules
- D. Free solids
The statement ‘Heat lost by the hot body equals that gained by the cold one’ is assumed when determining specific that heat capacity by the method of mixtures. Which of the following validates the assumption?
I. Lagging the Calorimeter
II. Ensuring that only S.I units are used
III. Weighing the calorimeter, the lid and the stirrer.
- A. I only
- B. I & II only
- C. I & III only
- D. II & III only
During the transformation of matter from the solid to the liquid state, the heat supplied does not produce a temperature increase because
- A. the heat energy is quickly conducted away
- B. the heat capacity has become very large as the substance melts
- C. the heat gained is equal to the heat lost by the substance
- D. all the heat is used to break the bonds holding the molecules of the solid together
The limiting frictional force between two surfaces depends on
I. the cohesive force of the material
II. the nature of the surfaces in contact
III. the relative velocity between the surfaces
- A. I only
- B. II only
- C. III only
- D. I & IV only
An alternating current can induce voltage because it has
- A. ripple value
- B. varying magnetic field
- C. weaker magnetic field than direct current
- D. high peak value
A thermocouple thermometer is connected to a millivoltmeter which can read up to 10mV. When one junction is in ice at 0°C and the other is steam at 100°C, the millivoltmeter reads 4mV. What is the maximum temperature which this arrangement can measure
- A. 100\(^o\)C
- B. 248\(^o\)C
- C. 250\(^o\)C
- D. 350\(^o\)C
A vibrator causes water ripples to travel across the surface of a tank. The wave travels 50cm in 2s and the distance between successive crests is 5cm. Calculate the frequency of the vibrator
- A. 5Hz
- B. 6Hz
- C. 5.2Hz
- D. 25Hz
A supply of 400V is connected across capacitors of 3μf and 6μf in series. Calculate the charge
- A. 8 x 10\(^{-4}\)C
- B. 4 x 10\(^{-2}\)C
- C. 8 x 10\(^{-3}\)C
- D. 4 x 10\(^{-8}\)C
The diagram above represents the stress-strain graph of a loaded wire. Which of these statements is correct?
- A. At J, the wire becomes plastic
- B. J is the yield point
- C. L is the elastic limit
- D. At K, the wire breaks
Aluminium is sometimes used as the leaf of an electroscope because it
- A. is a light material
- B. is a good conductor
- C. is a good insulator
- D. can be converted into thin sheets
When the downward current flows in a straight vertical conductor, the direction of its magnetic field at a point due north of the wire is?
- A. Upward
- B. North
- C. South
- D. West
The pitch of a screw jack is 0.45cm and the arm is 60cm long. If the efficiency of the Jack is 75/π %, calculate the mechanical advantage.
- A. 400
- B. 300
- C. 200
- D. 150