(a)(i) What is an eclipse?

(ii) List the three types of eclipse.

(b) A student in a lecture theatre can read from the board clearly but requires a pair of spectacles to read from a book.

(i) What eye defect has this student?

(ii) What type of lens is needed to correct the eye defect?

(iii) The focal length of the lens used to correct this defect is 10cm. Calculate the power of the lens.

(c) A car B moves towards a stationary car A. If B produces an ultrasonic sound at a point and it takes 5.6 x 10\(^{-3}\)s for a beep to be heard in B, calculate the distance between the two cars at that instant. (Speed. sound in air = 340 ms\(^-\))

(d) The image of an object is located 9 cm behind a convex mirror. If magnification produced is 0.6, calculate the focal length of the mirror.

Convert 45°C to kelvin

• A. 318K
• B. 250K
• C. 184K
• D. 120K

One end of a long wire is fixed while a vibrator is attached to the other end. When the vibrator is energized, the types of waves generated in the wire are

• A. stationary and longitudinal
• B. stationary and transverse
• C. progressive and transverse
• D. progressive and longitudinal

Which of the following substances lowers the surface tension of water?

• A. metal
• B. sand
• C. detergent
• D. paper

(a) Define elastic limit

(b) State Hookes laws of elasticity

According to kinetic molecular model, in gases

• A. The molecule are very fast apart & occupy all the space made available
• B. The particles occur in clusters with molecules slightly farther apart
• C. The particles vibrate about fixed positions and are held together by the strong intermolecular bond between them
• D. The particles are closely packed together, they occupy minimum space & are usually arranged in a regular pattern

The vapour pressure?

• A. increases non-linearly with measuring temperature
• B. increases linearly with increasing temperature
• C. decreases linearly with increasing temperature
• D. decreases non-linearly ith measuring temperature

What will happen to the boiling point of pure water when it is heated in a place 30m below sea level?

• A. It will be more than 100^oC
• B. It will be last than 100^oC
• C. It will still be at 100^oC
• D. It will be fluctuating

The process whereby a liquid turns spontaneously into vapour is called

• A. regelation
• B. evaporation
• C. boiling
• D. sublimation

The material used to slow down the neutrons in a nuclear reactor is

• A. boron
• B. copper
• C. graphite
• D. uranium