Which of the following defects of vision is as a result of the eye ball being too long?

• A. long sight
• B. astigmatism
• C. short sight
• D. loss of accommodation

A block and tackle is used to raise a load of 250N through a vertical distance of 30m. What is the efficiency of the system if the work done against friction is 1500J?

• A. 62.5%
• B. 73.3%
• C. 83.3%
• D. 94.3%

A block of material of volume 2 X 10\(^{-5}\)m\(^3\) and density 2.5 x 10\(^3\) kgm\(^{-3}\) is suspended from a spring balance with half volume of the block immersed in water. What is the reading of the spring balance? (Density of water =1.0x10\(^3\) kg m\(^{-3}\) g = 10 ms\(^{-2}\)).

• A. 0.10N
• B. 0.25N
• C. 0.30N
• D. 0.40N

(a) List two factors that can affect the rate of diffusion

(b) State two examples to illustrate the effects of surface tension.

A wire is stretched between two points, 1m apart. If the speed of the wave generated on plucking the wire is 200ms^-1, what is the minimum frequency which will resonate with the wire?

• A. 50 Hz
• B. 75 Hz
• C. 100 Hz
• D. 200 Hz

The quality of a note depends on its

• A. frequency
• B. pitch
• C. overtones
• D. amplitude

The diagram below illustrates a hot metal suspended at the centre of a closed uniform box. Thermometers E, F, G and H are placed in contact with four sides of the box. Which of the thermometers would register the highest temperature?

• A. G
• B. F
• C. H
• D. E

Particles of mass 10^−2kg is fixed to the tip of a fan blade which rotates with angular velocity of 100rads^−1. If the radius of the blade is 0.2m, the centripetal force is?

• A. 2N
• B. 20N
• C. 200N
• D. 400N

In fig. la and fig.1 b above, Ida and Wb represent the respective loads on a spring placedtiear a 30 cm rule, when in air and when in water:

(a) Identify the force causing a shrink in the spring in fig.(b).

(b) Given that the force constant of the spring is 2.0 x 10\(^{11}\) Nm\(^{-1}\), calculate the work done by the force in causing the shrink.

(a) State two essential differences between a moving coil galvanometer and a d.c. generator.

(b) Explain the term eddy currents and statetwo devices in which the currents are applied.

(c) State the principle on which the potentiometer is based when it is functioning.

(d) A source of e.m.f. 110 V and frequency 60Hz is connected to a resistor, an inductor and a capacitor in series. When the current in the capacitor is 2A, the potential differences across the resistor is 80 V and that across the inductor is 40 V. Draw the vector diagram of the potential differences across the inductor, the capacitor and the resistor.

Calculate the:

(i) potential difference across the capacitor;

(ii) capacitance of the capacitor;

(iii) inductance of the inductor. [π = 3.14]