The City SchoolNorth Nazimabad Girls Campus

Science – Revision- Worksheet- 5-Class 7Name: ____________________________Sec:_______ Date: ________________

Q1. Rosie poured some lavender oil into an oil burner. She heated it with a candle.

The oil changed state:

Which diagram represents this change of state? Write the letter. _____________________

Q2a) Sarah went out in darkness, she tried to switch on her torch but it did not work. Draw its circuit diagram using symbols.

b) Write the possible faults in her torch, which stopped it from working.

1. ___________________________________________________________________________

2. ___________________________________________________________________________

3. ___________________________________________________________________________

4. ___________________________________________________________________________

Q3. (a) Max built circuit 1 as shown below.

He closed the switch, S, and all the bulbs came on.One of the bulbs then broke and all the bulbs went off.Which bulb must have broken?Give the letter. ________

(b) Max built circuit 2 as shown below.He connected a plastic comb and a metal key in different parts of the circuit.

Look carefully at circuit 2. Complete the table below to show which bulbs in circuit 2 will be on or off when different switches are open or closed. Write on or off in the boxes below.

(c) Max built circuit 3 using a battery, two bulbs and three ammeters.

The current reading on ammeter A1 was 0.8 amps.What would be the reading on ammeters A2 and A3?Place one tick in the table by the correct pair of readings.

Q4. (a) Name the fossil fuels? Briefly describe how they were formed.

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(b) Most of the energy resources derive their energy primarily from sun. Discuss.

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(c) Describe Geo thermal energy.

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Q5.When copper metal is heated it reacts with a gas in air.

a) Name the gas. ________________________________

b) Which statement below describes what happens in a chemical change but not in a physical change? Tick the correct option. 1. The product is a solid.

2. The change only happens at a high temperature.

3. The atoms have combined in a different way to make a new substance.

4. The types of atoms at the start are the same as the end products.

Q6. Complete the word equations. a) Iron + Sulphur ____________________

b) Methane + Oxygen ____________________ + ____________________

Q7. Atomic Number of a sodium atom is 11. Write down: a) Symbol of sodium atom:___________________

b) Number of protons : ___________________

c) Number of electrons : ___________________

d) Sodium atom lost one electron in a reaction. Write down the symbol of ion formed:

___________________

e) Draw electronic diagram of the sodium ion.