Which of the following does NOT describe the Image formed by a plane minor?

Same distance from mirror as object

The differences observed in solids, liquids and gases may be accounted for by

the spacing and forces acting between the molecules

the different molecules in each of them

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 negative charge and a negative potential

a positive charge and a zero potential

a negative charge and a positive potential

a negative charge and a negative potential

A narrow beam of white light can be split up into different colours by a glass prism. The correct explanation is that

different colours of white light travel with different speeds in glass

white light Is an electromagnetic wave

the prism has all the colours of the white light

different colours of white light travel with different speeds in glass

white light has undergone total Internal reflection in the prism

Convex mirrors are used as driving mirrors because images formed are

inverted, virtual and diminished

Which of the following is true of an electrical charge?

Positive charge means deficit electrons

Negative charge means excess of electrons

electric current means movement of electrons

In homes, electrical appliances and lamps are connected in parallel because

series connection uses high voltage

parallel connection does not heat up the wires

series connection uses high voltage

JAMB UTME - Physics - 2018 | Green Bridge CBT

Question 1 Report

Electrical appliances in homes are normally earthed so that

a person touching the appliances is safe from electric shock

both the a.c. and d.c. sources can be used

the appliances are maintained at a higher pd than the earth

the appliances are maintained at a lower pd than the earth

Answer Details

Electrical appliances in homes are normally earthed so that a person touching the appliances is safe from electric shock. Earthing provides a safety mechanism by connecting the metal case of an electrical appliance to the earth through a conductor. In the event of a fault in the appliance, such as a short circuit, the current will flow through the earth wire instead of the person's body, preventing electric shock. By connecting the metal case of an appliance to the earth, the potential difference (PD) between the appliance and the earth is reduced to zero, ensuring that the appliance is maintained at a lower PD than the earth. Therefore, "the appliances are maintained at a lower pd than the earth" is the correct answer.






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