iGCSE Physics Revision Round 1

Iodine-131 has a half life of 8.07 days. What fraction of a sample of Iodine-131 is left unchanged after 16.14 days?

• 1/2

• 1/4

• 1/8

• 1/16

Finish the following alpha decay reaction:

• 
• 
• 

What is the current through the battery?

• 450 A

• 2 A

• 20 mA

• 9 A

If a 75 W light bulb operates at a voltage of 120 V, what is the current in the bulb?

• 0.63 A

• 1.6 A

• 9.0 x 10³ A

• 1.1 x 10^-4 A

A car dashboard panel bulb has a resistance of 33 Ω when it is placed across a 12 V battery. What is the current through the circuit?

• 0.36 A
• 2.8 A
• 3.96 A
• 396 A

Volt meters are connected in.....

• series

• parallel

According to the graph how fast does the person travel in the first 5 seconds?

• 2 m/s

• 10 m/s

• 12.5 m/s

• 1 m/s

Just after the parachutist jumps out of the plane (before the parachute opens). The relative forces on them are:

• downward weight balances the upward friction force

• upward friction is constant

• downward weight is greater that the upward friction

• upward friction is greater than the downward weight

Pressure is measured in what units

• Newtons
• m/s
• Pascals
• Moles

What types of waves transfer energy perpendicular to the direction of oscillations?

• Longitudinal waves

• Transverse waves

• Sound waves

• P-waves