The diagram below represents a stationary wave set up in a string which is fixed at both ends. lf the frequency of the wave is 256Hz and the distance N1 N2 equals 1.5m, calculate the speed of the wave.

• A. 128ms^-1
• B. 192ms^-1
• C. 384ms^-1
• D. 768ms^-1

An inductor of inductance 1.0H is connected in series with a capacitor of capacitance 2.0\(\mu F\) in an a.c. circuit. to resonate

• A. 112.5Hz
• B. 225.0Hz
• C. 323.5Hz
• D. 707.1Hz

A cell of e.m.f. 1.5V is connected in series with a resistor of resistance 3.0\(\Omega\). A voltmeter connected across the cell registers 0.9V. Calculate the internal resistance of the cell

• A. 2.0\(\Omega\).
• B. 3.0\(\Omega\).
• C. 5.0\(\Omega\).
• D. 6.0\(\Omega\).

The number of neutrons contained in the nucleus \(^{238}_{92}U\) is

• A. 92
• B. 146
• C. 238
• D. 330

The capacitance of a parallel-plate capacitor

• A. decreases when the seperation between the plate decreases
• B. increases when the optential difference between the plates is increased
• C. is greater without a dielectric material between the plates than with a dielectric
• D. is greater with a dielectric between the plates than without a dielectric.

Which of the following statements is correct about the angle of dip at various points on Earth?

• A. The angle of dip is zero at the equator and 90 degrees at the magnetic poles.
• B. The angle of dip is greater at higher altitudes than at lower altitudes
• C. The angle of dip is positive in the northern hemisphere and negative in the southern hemisphere.
• D. The angle of dip is constant at all points on Earth

Which of the following liquids has the highest surface tension?

• A. Soapy water
• B. Water
• C. Mercury
• D. Oil

(a)(i) With the aid of a labelled diagram describe the mode of operation of a modern X-ray tube.

(ii)State the energy transformations that take place during the operation of the X-ray tube.

(b) Define, as applied to X-rays, the following terms:

(i) hardness;

(ii) intensity.

(c) State (i) four uses of X-rays;

(ii) one hazard of over-exposure to X-rays in a radiological laboratory.

A structural engineer stood on a top of a building releasing a light and heavy object to the ground which of the following statement is true?(Neglect Air Resistance)

• A. Both the light and heavy subject reach the ground at the same time
• B. The light object get to the ground first before the heavy object
• C. The heavy object to the ground first before the light object
• D. None get to the ground first

The maximum displacement on either side of the equilibrium position of an object in simple harmonic motion represents

• A. period
• B. amplitude
• C. wavelength
• D. frequency