A ray incident on a glass prism undergoes minimum deviation when the

• A. incident angle is equal to the angle of refraction
• B. refraction angle equals 90o
• C. incident angle equals 90o
• D. incident angle is equal to the angle of emergence

A converging lens of focal length 10cm forms an erect image three times the size of the real object. Calculate the distance between the image and the object.

• A. 6.6cm
• B. 11.1cm
• C. 13.3cm
• D. 20.0cm

(a) Statetwo differences between a sound wave and a radio wave.

(b) Explain why a vibrating tuning fork sounds louder when its stem is pressed against a table top than when held in air.

(c)Statetwo conditions necessary for the:

• production of stationary wave in a medium;
• formation of interference wave patterns;
• occurrence of total internal reflection of a wave.

(d) A ray of light is incident on one face of an equilateral glass prism.

• Draw a ray diagram to show the path of the ray through the prism.
• Calculate the refractive index of the glass if the angle of minimum deviation is 41\(^o\).

An object is placed in front of two plane mirrors inclined at an angle of 0^o. If the total number of images formed is 7, Find the value of \(\theta\)

• A. 30^o
• B. 45^o
• C. 51^o
• D. 90^o

When a person holds a negatively charges metal rod and stands bare-footed on the ground, how will the charges leak?

• A. negative charges flows to the ground through the person's body
• B. positive charges flow from the ground through his body to neutralize the negative charges
• C. positive charges in the air neutralizes the negative charges the person is holding
• D. negative charges will leak through the air

A transformer has 300 turns of wire in the primary coil and 30 turns in the secondary coil. If the input voltage is 100 volts, the output voltage is

• A. 5 volts
• B. 10 volts
• C. 15 volts
• D. 20 volts

A hydrometer is an instrument used in measuring

• A) vapour pressure of a fluid
• B) density of liquid
• C) relative humidity of a liquid
• D) relative density of a liquid

When salt is dissolved in water, the freezing point of the water

• A. increases
• B. decreases
• C. remains the same
• D. increases and later decrease

The magnitude of the expansion or contraction of a substance depends on the i. temperature change ii. nature of the substance iii. size of the substance. Which of the statements above are correct?

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

(a) For a water voltameter, identify the;

(i) electrolyte;

(ii) electrodes;

(iii) substances deposited on the electrodes

(b)State the ratio of the volume of the substances deposited in (a) (iii) above