The wire of a platinum resistance thermometer has d resistance of 3.5\(\Omega\) at 0 °C and 10.52\(\Omega\) at 100°C. Calculate the temperature of the wire when its resistance is 7.5\(\Omega\).

• A.78 \(^o\)C
• B.25 \(^o\)C
• C.30\(^o\)C
• D.57 \(^o\)C

Which of the following statements is the correct reason for using soft iron in making the armature or an electric bell?

• A. It is a diamagnetic material
• B. It loses its magnetism readily
• C. It is not easily magnetized
• D. It retains its magnetism for a long time

A transverse pulse of frequency 9 Hz traves 4.5m in 0.6 s. Calculate the wavelength of the pulse.

• A. 3.33 m
• B. 0.30 m
• C. 0.83 m
• D. 1.20 m

The mass of a load is doubled while the force acting on it is halved. The resulting acceleration of the load is

• A. quadrupled
• B. quartered
• C. halved
• D. doubled

(a) State the principle of operation of fibre optics.

(b) State two applications of fibre optics in medicine.

In which of the following media is the speed of sound the least?

• A. Air
• B. Brass
• C. Water
• D. Wood

(a) The diagram below illustrates a projectile motion. Identify each of the physical quantities labeled P, β, H and R.

(b) Write an equation to show the relationship between P, g and Rmax’ where g is the acceleration due to gravity and Rmax is maximum R.

Which of the following graphs gives the correct relationship between energy and mass when mass is converted to energy.

• A. A
• B. B
• C. C
• D. D

An instrument used to measure relative humidity is the?

• A. hygrometer
• B. hydrometer
• C. pyrometer
• D. manometer

Which of the following statements about a moving object is correct?

• A. When accelerating, the resultant force acting on it must be equal to zero.
• B. There must always be a non-zero resultant force acting on it.
• C. At a steady velocity, the resultant force acting on it must be equal to zero
• D. At a steady velocity, the air resistance must be equal to zero.