fig 1 is a graph of force against extension for a spiral spring, the force constant of the spring is given by the
- A. slope of the linear prtion of the graph
- B. length of the linear portion of the graph
- C. area under the linear portion of the graph
- D. area under the entire graph
A uniform meter rule QR is balanced on a knife edge which is 55cm from R, when a mass of 10g is hung at P as shown above, the mass of the meter rule is
- A. 550g
- B. 350g
- C. 70g
- D. 35g
In fig 3, three forces F1, F2, and F3 acting at O are in equilibrium. If the magnitude of F1 is 10N,and the magnitude of F2 is 5N, find the magnitude of F3
- A. 26.4N
- B. 15.0N
- C. 13.2N
- D. 10.0N
fig 4 represents a block-and-tackle pulley system on which an effort of W newtons supports a load of 120.0N if the efficiency of the system is 40% then the value of W is
- A. 28.0N
- B. 48.0N
- C. 50.0N
- D. 288.0N
In an experiment in which molten naphthalene is allowed to cool, the cooling curve in fig 5 was obtained, the temperature \( 80^{\circ}C \) is known as
- A. cooling temperature
- B. boiling point
- C. melting point
- D. vaporization point
In fig 6, a ray of light in air strikes a glass plate at an angle of incidence 60 degrees, the reflected ray is observed to be perpendicular to the refracted ray, what is the refractive index of the glass
- A. 1.73
- B. 1.50
- C. 0.87
- D. 0.57
if the fig above E is an accumulator with negligible internal resistance. and the EMF 9.0V, The the total current is
- A. 0.3A
- B. 0.8A
- C. 1.0A
- D. 1.8A
When a box of mass 45kg, is given an initial speed of 5ms-1 it slides along a horizontal floor a distance of 3m before coming to a rest. what is the coefficient of kinetic friction between the box and the floor? (G = 10ms-2)
- A. \( \frac{5}{6} \)
- B. \( \frac{5}{12} \)
- C. \( \frac{1}{3} \)
- D. \( \frac{2}{3} \)
Which of the following is most strongly deflected by magnetic field?
- A. \(\gamma\) - rays
- B. X- particle
- C. \(\beta\) - particles
- D. X - rays
The wavelength of ultraviolet radiation is 400nm. If the speed of light in air is 3 x 108ms-1, then the frequency of the ultraviolet radiation is
- A. 1.3 x 1015Hz
- B. 7.5 x 105Hz
- C. 1.2 x 1011Hz
- D. 7.5 x 1014Hz
If the inclination at Ibadan is 7oS, this means that
- A. the angle between the geographic meridian and the magnetic meridian at Ibadan is 7o
- B. the earth's magnetic intensity at Ibadan makes angle 7o with the horizontal direction
- C. a magnetic needle will be inclined at 7o to the vertical at Ibadan
- D. the north pole of a magnetic needle dips downward at Ibadan
The sign of the change on a charged glass rod may be determined with
- A. a charged electroscope
- B. an uncharged electroscope
- C. a galvanometer
- D. an electrometer
The angle between the magnetic meridian and the geographic meridian at a locality on the earth is the
- A. longitude of the locality
- B. angle of inclination at the locality
- C. latitude of the locality
- D. angle of declination of the locality
Which of the following is true of magnetism?
- A. Iron fillings cling mainly round the ends of a bar magnet
- B. The freely suspended bar magnet comes to rest in the geographic north-south direction
- C. Like poles attract
- D. Iodestone is a non-magnetic oxide
Which of the following is stored by a dry Leclanche cell?
- A. Electrical power
- B. Kinetic energy
- C. Electric current
- D. Chemical energy
Which of the following is NOT a part of a d.c. electric motor?
- A. Field-magnet
- B. Armature
- C. Commutator
- D. Transformer
The vibration of an air column produces the sound in the
- A. piano
- B. guiter
- C. flute
- D. school handbell
A man clapping his hands at regular intervals observes that the echo of a clap coincides with the next clap. If the reflecting cliff is 160m away and the speed of sound is 320ms-1, what is the frequency of the clapping?
- A. 1 Hz
- B. 2Hz
- C. 4Hz
- D. 8Hz
Which of the following is true of the loudness of sound? It
- A. depends on the square of the amplitude of the vibrating body
- B. is proportional to the distance of the observer from the source of the sound
- C. is greatest in vacuum
- D. is dependent in vacuum
A wave of frequency 10Hz forms a stationary wave pattern in a medium where the velocity is 20cms-1. The distance between adjacent nodes is
- A. 1.0cm
- B. 1.5cm
- C. 2.0cm
- D. 5.0cm