O level Physics Current of Electricity (5 qns)

The diagram shows an experimental set-up of an electric circuit to determine the resistance of a bulb.

Which one of the following shows the correct circuit diagram?

• 
• 
• 
• 

Arrange wires X, Y and Z in ascending order of their resistances.

• X, Y, Z

• X, Z, Y

• Y, X, Z

• Z, X, Y

Which cylinder, when connected in the circuit, makes the lamp glow most brightly and which cylinder makes the lamp glow least brightly?

• Most brightly: W

  Least brightly: Y

• Most brightly: W

  Least brightly: Z

• Most brightly: X

  Least brightly: Y

• Most brightly: X

  Least brightly: Z

Which object will not attract tiny pieces of paper?

• A metal knife sharpened with a knife sharpener

• A ceramic spoon wiped with a kitchen cloth

• A plastic comb combed through dry hair

• A wooden pencil rubbed with an eraser

Across which two faces would there be maximum electrical resistance?

• the faces labelled P

• the faces labelled Q

• the faces labelled R

• the resistance is the same for all