Any line or section taken through an advancing wave in which all the particles are in the same phase is called the
- A. wavelength
- B. wave coast
- C. wave trough
- D. wave front
A car moving at 20m/s with its horn blowing (f = 1200Hz) is chasing another car going at 15m/s. What is the apparent frequency of the horn as heard by the driver being chased?
- A. 1.22KHz
- B. 2.40KHz
- C. 8.12KHz
- D. 1.22Hz
The Earth’s magnetic equator passes through Jos in Nigeria. At Jos, the
- A. angle of variation is zero
- B. magnetic declination is 90
- C. angle of dip is zero
- D. horizontal component at the Earth's field is zero
Calculate the velocity ratio of a screw jack of pitch 0.2cm if the length of the tommy bar is 23cm
- A. 230\(\pi\)
- B. 23\(\pi\)
- C. 70\(\pi\)
- D. 140\(\pi\)
Which of the following statement about the electromagnet shown above is correct?
- A. when the current flows from A to B, the end A will be in north pole
- B. when the current flows from A to B, the end A will be south pole
- C. when the current flows from A to B, the end B will be south pole
- D. none of the above
A single force which produces the same effect as a set of forces acting together at a point is known as the
- A. component
- B. equilibrant
- C. resultant
- D. resistant
Radio waves belongs to the class of waves whose velocity is about
- A. 340m/s
- B. 3 × 10\(^{6}\) m/s
- C. 3 × 10\(^{8}\) m/s
- D. 3 × 10\(^{-8}\) m/s
A microscope is focused on a mark on a table, when the mark is covered by a plate of glass 2m thick, the microscope has to be raised 0.67cm for the mark to be once more in focus. Calculate the refractive index.
- A. 1.50
- B. 1.68
- C. 2.58
- D. 1.82
One newton × One meter equals?
- A. One water
- B. One Joule
- C. One ampere
- D. One kilogram
When a girl moves towards a plane mirror at a speed of 4.0m/s, the distance between the girl & her image reduces at a speed of
- A. 2 m/s
- B. 4 m/s
- C. 8 m/s
- D. 12 m/s
Water and Kerosine are drawn respectively into the two limbs of a Hare’s apparatus. The destiny of water is 1.0gcm\(^{-3}\) and the density of kerosine is 0.80gcm\(^{-3}\). If the height of the water column is 20.0cm, calculate the height of the kerosine column.
- A. 1.6cm
- B. 16.0cm
- C. 20.0cm
- D. 25.0cm
In semi-conductor, the carriers of current at room temperature are
- A. electrons only
- B. electrons and holes
- C. holes only
- D. electron and ions
An a.c of 1A at a frequency of 800 cycles per second flows through a coil, the inductance of which is 2.5mH and the resistance of which is 5Ω. What is the power absorbed in the Coil?
- A. 5W
- B. 6W
- C. 7W
- D. 8W
Three resistors with resistance 200Ω, 500Ω and 1kΩ are connected in series. A 6v battery is connected to either end of the combination. Calculate the potential difference between the ends of 200Ω resistance.
- A. 0.71V
- B. 0.7V
- C. 0.82V
- D. 0.8V
The mass of a nucleus is the
- A. total number of its proton & neutrons
- B. number of its protons
- C. mass of its electrons
- D. total number of its protons & electrons
Neutrons were discovered by
- A. Faraday
- B. Dalton
- C. James Chadwick
- D. Rutherford
Gases conduct electricity under
- A. high pressure & high voltage
- B. low pressure & low voltage
- C. normal pressure & low voltage
- D. low pressure & high voltage
A man on a bench will exert the greatest pressure on the bench when he
- A. lies flat on his back
- B. lies flat on his belly
- C. stands on both feet
- D. stands on the toes of one foot
A siren having a ring of 200 hole makes 132 rev/min. A jet of air is directed on the set of holes. Calculate the frequency and wavelength in air of the note produced (take v = 350m/s)
- A. 0.795m
- B. 0.625m
- C. 0.335m
- D. 0.125m
A mixture of blue and red pigment when illuminated by white light will appear
- A. green
- B. orange
- C. yellow
- D. magenta
When water is boiling, it
- A. gets hotter
- B. increase is mass
- C. decreases in mass
- D. changes to steam