A positively charged rod X is brought near an uncharged metal sphere Y and is then touched by a finger with X still in place. When the finger is removed, the result is that Y has

• A. no charge and a zero potential
• B. a positive charge and a zero potential
• C. a negative charge and a positive potential
• D. a negative charge and a negative potential

What effort will a machine of efficiency 90% apply to a load of 180N if its efforts arm is twice as long as its load arm?

• A. 100N
• B. 90N
• C. 80N
• D. 120N

Electrical appliances in homes are normally earthed so that

• A. a person touching the appliances is safe from electric shock
• B. both the a.c. and d.c. sources can be used
• C. the appliances are maintained at a higher pd than the earth
• D. the appliances are maintained at a lower pd than the earth

In the diagram shown, If the south-poles of two magnets stroke a steel bar, the polarities at T and V will respectively be

• A. north and south
• B. south and south
• C. north and north
• D. south and north

What is the resultant resistance of the circuit in the image shown?

• A. 8Ω
• B. 11Ω
• C. 4Ω
• D. 3.6Ω

The process whereby a liquid turns spontaneously into vapour is called

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

The density of 400cm³ of palm oil was 0.9gcm^-3 before frying. If the density of the oil was 0.6gcm^-3 after frying, assuming no loss of oil due to spilling, its new volume was?

• A. 1360cm³
• B. 600cm³
• C. 240cm³
• D. 8000m³

Convex mirrors are used as driving mirrors because images formed are

• A. erect, Virtual and diminished
• B. erect, real and diminished
• C. erect, virtual and magnified
• D. inverted, virtual and diminished

A lead bullet of mass 0.05 kg is fired with a velocity of 200 m/s into a lead block of mass 0.95 kg. Given that the lead block can move freely, the final kinetic energy after impact is

• A. 100J
• B. 150J
• C. 50J
• D. 200J

Calculate the effective capacitance of the circuit in the diagram given

• A. 4μf
• B. 3μf
• C. 2μf
• D. 1μf