(LFN) Week 4. CS Intervention Revision

A battery moves a charge of 80 C around a circuit in a time of 16 s. What is the current in the circuit?

• 4 A

• 5 A

• 0.2 A

• 1 280 A

Answer explanation

What does this symbol stands for?

• Fixed resistor

• Variable resistor

• Battery

• Fuse

The following equation is incomplete.

Mg(OH)₂ + 2HNO₃ --> X

What is X?

• Mg(NO₃)₂ + 2H₂O

• Mg(NO₃)₂ + H₂O

• MgN₂O₆ + 2H₂O

• 2MgNO₃ + 2H₂O

Which element forms an oxide that reacts with water to give an acidic solution?

• Sulphur

• Sodium

• Aluminium

• Magnesium

Where is amylase secreted in the human digestive system?

• Stomach and liver

• Stomach and small intestine

• Pancreas and liver

• Pancreas and salivary gland

Answer explanation

What is the end product from the breakdown of starch by amylase?

• Maltose

• Glucose

• Amino acids

• Glycerol

Answer explanation

In which part of the leaf does most of the photosynthesis occur?

• Palisade mesophyll cells

• Upper epidermis

• Guard cells

• Spongy mesophyll cells

Answer explanation

Sunlight is coming from the top part of the leaf.

Palisade mesphyll cells located on the upper part o the leaf and contains the most chlorophyll.

Therefore, most photosynthesis occurs there.

A current of 6 A flows in the circuit shown. The current splits up when it enters parallel branches of resistors.

What is the reading on the ammeter?

• 6A

• 2A

• 3A

• 5A

The diagram shows an electrical circuit.

The reading of ammeter A2 is 1 A and of A4 is 3 A.

What are the readings of ammeters A1 and A3?

• A1/A = 1.5

  A3/A = 0.5

• A1/A = 3

  A3/A = 1

• A1/A = 3

  A3/A = 2

• A1/A = 2

  A3/A = 1

A battery of e.m.f. 12 V is connected in series with three resistors.

The p.d. across two of the resistors is shown.

 

What is the p.d. across the third resistor, R?

• 5V

• 6V

• 7V

• 4V