IGCSE Revision Physics

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

Tags

NGSS.HS-PS1-8

Finish the following alpha decay reaction:

• 
• 
• 

Tags

NGSS.HS-PS1-8

Which type of radiation releases an electron?

• Alpha radiation

• Beta radiation

• Gamma radiation

• Theta radiation

Tags

NGSS.HS-PS1-8

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

Compared to thin wires, electrical resistance in thick wires is:

• greater
• less
• the same

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

During a physics lab, a plastic strip was rubbed with cotton and became positively charged. The correct explanation for why the plastic strip becomes positively charged is that ...

• the plastic strip acquired extra protons from the cotton.

• protons are created

• protons are transferred from the plastic to the cotton

• electrons are transferred from the plastic to the cotton

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