(a) State Faraday’s second law of electrolysis.

(b) An electric charge of 9.6 x 10\(^4\) C liberates 1 mole of substance containing 6.0 x 10\(^{23}\) atoms. Determine the value of the electronic charge

The wavelength of a wave traveling with a velocity of 420 m/s is 42 m. what is its period?

• A) 1.2 s
• B) 1.0 s
• C) 0.5 s
• D) 0.1 s

Which of the following may be used to explain a mirage? i. layers of air near the road surface have varying refractive indices in hot weather. ii. road surfaces sometimes become good reflectors in hot weathers. iii. light from the sky can be reflected upwards after coming close to the road surface.

• A. ii only
• B. ii and iii only
• C. i and iii only
• D. i, ii, and iii only

From the diagram below, calculate the total current in the circuit

• A. 5.0A
• B. 3.7A
• C. 4.5A
• D. 4.0A

The load-extension graph of an elastic material is illustrated below. Use the graph to determine the work done in stretching the material

The period of a simple pendulum X is 5s. What is the period of a simple pendulum Y which makes 50 vibrations in the same time it takes X to make 20 vibrations?

• A. 12.5s
• B. 2.5s
• C. 2.0s
• D. 1.2s

A projectile is fired with a velocity of 20 ms\(^{-1}\) at an angle of 40° to the horizontal. Determine the components of the velocity of the projectile at its maximum height.

Which of the following is not a consequence of hydrogen bubbles covering the copper plate of a primary cell?

• A. Polarization
• B. Local action
• C. Formation of hydrogen electrode
• D. Increase in the resistance of the cell

A ray of light traveling from a rectangular glass block of refractive index 1.5 into air strikes the block at an angle of incidence of 30. Calculate its angle of refraction.

• A. 48.6°
• B. 19.5°
• C. 20.0°
• D. 45.0°

It takes a shorter time for a liquid to boil at the top of a mountain than at the base because at the top, the

• A. temperature is higher
• B. pressure is lower
• C. humidity is higher
• D. temperature is constant