Revision Grade 9

"I" is the symbol for

• Electrical Resistance

• Electrical Power

• Electrical Current

• Electrical Charge

A circuit has a total resistance of 5 ohms and a voltage of 3 volts. What is the current flowing?

• 0.6 A

• 15 A

• 1.7 V

• 8 A

0.0002368 expressed to two significant figures is...

• 2.4

• 0.24

• 0.00024

• 240

The number 0.000568 in standard form correct to two significant figures is...

• 5.68 x 10^-4

• 5.7 x 10^-4

• 5.6 x 10^-4

• 5.7 x 10⁴

45 µs is the same as

• 45 x 10^-6 s

• 4.5 x 10^-6 s

• 45 x 10^-3 s

• 4.5 x 10^-3 s

ms^-2 x ms^-2 is the same as

• ms^-4

• m²s⁴

• m²s^-4

• m^-2s⁴

Which of the following is NOT a method of heat transfer?

• conduction

• convection

• radiation

• convention

Which of the following is an electrical safety device?

• circuit

• extension cord

• connecting wire

• 3 pin plug

If an object is positively charged it means that it has

• gained protons

• gained electrons

• loss protons

• loss electrons

When the South poles of two bar magnets are facing each other, the magnets will ________.

• push away

• come together

• attract

• do nothing