(i)  The addition of impurities to an element like silicon is aimed at:

1. making p-n junction
2. increasing the conductivity of the element 
3. stabilizing the temperature of the element
4. making the element heavier
5.   increasing the resistivity of the element

(ii)According to the usual transformer notation, which of the following equations is correct?

.

iii)When a person perspires on a hot day:

1.  evaporation occurs and helps to cool the body.
2. heat is conducted away from the body
3. latent heat keeps the body warm        
4. the body is insulated from the warm air
5. convection cools the body

(iv)  Which of the following sources of energy are non-renewable?

1. Water, wind and natural gas. 
2.  Fossils, sun, oil and nuclear.
3. Natural gas, water, nuclear and wood.
4.  Wind, sun, fossils and oil.
5. Oil and all natural gases.

(v)     Heat is supplied at equal rates to equal masses of water and aluminium The temperature of aluminium rises more quickly than that of water because the aluminium has:

1.  a lower latent heat
2.  a higher heat capacity 
3.  a higher specific heat capacity 
4.  a higher latent heat  
5.  a lower specific heat capacity

Which of the following device works on d.c only?

1. An electric bell  
2.  A step-down transformer
3. A transistor 
4. An induction coil
5. A step-up transformer

(vii)        Which statement is correct regarding alpha particles?

1. They carry a negative charge.
2. They are hardly deflected by magnetic fields.
3.  They travel a long distance in air. 
4.  They are very penetrating.  
5. They are identical with the nuclei of hydrogen atoms.

(viii)       The cost of electricity for a 2000W electric fire used for 10.30 hours at the rate of Shs. 8.00 per KWh is:

1. shs. 160    
2.  shs. 80
3. shs. 168
4. shs. 1,600 
5.  shs. 3,200

(ix)  The following is an important sign that can be observed before an earthquake occurs:

1. The average temperature keeps decreasing daily.
2. Television signals and radio stations are received at a frequencr that is below normal.
3. The entire animal kingdom becomes highly disturbed and restless 
4.  The level of water in the ocean decreases by one third.
5. Formation of backward rivers due to sudden shaking of the earth

(x)     Water spreads and wets a surface when spilled on it because the:

1.  adhesive forces between water molecules and surface molecules are large
2.  cohesive forces between water molecules and surface molecules are large
3. adhesive forces between water molecules are small
4. cohesive forces between water molecules and surface mole are small
5. cohesive forces are greater than adhesive forces.

1.For each of the items (i) - (x) choose the correct answer among the given alternatives and write its letter beside the item number.

(i) The addition of impurities to element like silicon is aimed at 

1. making p-n junction.
2. increasing the conductivity of the element. 
3. stabilizing the temperature of the element 
4. making the element heavier.
5. increasing the resistivity of the element.

(ii) According to the usual transformer notation, which of the following equations is correct?

1.  I_S / I_P = N_S / N_P 
2. I_S / I_P = V_P / V_S 
3. I_S / I_P = V_S / V_P
4. N_P / N_S = V_S / V_P 
5. V_S / I_P = N_S / N_P

(iii) When a person perspires on a hot day

1. evaporation occurs and helps to cool the body.
2. heat is conducted away from the body.
3. latent heat keeps the body warm.
4. the body is insulated from the warm air.
5. convection cools the body.

(iv) Which of the following sources of energy are non-renewable?

1. Water, wind, wood and natural gas.
2. Fossils, sun, oil and nuclear.
3. Natural gas, water, nuclear and wood.
4. Wind, sun, fossils and oil.
5. Oil and all natural gas.

(v) Heat is supplied at equal rates to equal masses of water and aluminium. The temperature of aluminium rises more quickly than that of water because the aluminium has

1.  a lower latent heat.
2.  a higher heat capacity.
3.  a higher specific heat capacity. 
4.  a higher latent heat. 
5.  a lower specific heat capacity.

(vi) Which of the following device works on d.c. only?

1. an electric bell.
2. a step-down transformer
3. a transistor
4. an induction coil
5. a step-up transformer

(vii) Which statement is correct regarding alpha particles?

1. They carry a negative charge.
2. They are hardly deflected by magnetic fields.
3. They travel a long distance in air.
4. They are very penetrating.
5. They are identical with the nuclei of hydrogen atoms.

(viii) The cost of electricity for a 2000W electric fire used for 10.30 hours at the rate of shs 8.00 per KWh is

1.  shs 160 
2.  shs 80 
3.  shs 168
4.  shs 1600 
5.  shs 3200

(ix) The following is an important sign that can be observed before an earthquake occurs:

1. The average temperature keeps decreasing daily.
2. Television signals and radio stations are received at a frequency that is below normal.
3. The entire animal kingdom becomes highly disturbed and restless.
4. The level of water in the ocean decreases by one third.
5. Formation of backward rivers due to sudden shaking of the earth.

(x) Water spreads and wets a surface when spilled on it because the

1. adhesive forces between water molecules and surface molecules are large.
2. cohesive forces between water molecules and surface molecules are large.
3. adhesive forces between water molecules are small.
4. cohesive forces between water molecules and surface molecules are small.
5.  cohesive forces are greateer than adhesive forces.