Year 7 Physics HW Questions - HAGR Year 7 Science

[Pages:14]Year 7 Physics HW Questions

30 minutes 47 marks

Page 1 of 14

Q1.

Susan has a small fan to keep herself cool.

When she switches it on, a motor turns the blades to blow air.

(a) The diagrams below show the symbols for a battery, a motor and a switch.

In the space below, draw a series circuit diagram for the fan using these symbols.

(b) (i) Which part provides energy for the circuit? .........................................................

(ii) Some of this energy is used to turn the blades. The rest of the energy is wasted.

Complete the sentence below. Choose words from the list.

chemical

heat light

sound

When the blades are turning, energy is wasted as ....................................... energy and ....................................... energy.

1 mark 1 mark

1 mark 1 mark

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(c) Susan built a circuit using a battery, a motor and a switch. She closed the switch to turn the motor on. (i) Susan added a bulb to the circuit. The current in the circuit decreased. How did this affect the motor? ................................................................................................................

(ii) Susan removed the motor from the circuit. The current in the circuit increased. How did this affect the bulb? ................................................................................................................

1 mark

1 mark maximum 6 marks

Q2.

(a) Max built circuit 1 as shown below.

circuit 1

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.

...............

1 mark

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

circuit 2

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.

switch 1 open open closed

switch 2 open closed open

bulb P off

bulb Q off

bulb R off

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

2 marks

circuit 3

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The current reading on ammeter A was 0.8 amps. 1

What would be the reading on ammeters A and A ?

2

3

Place one tick in the table by the correct pair of readings.

readingon ammeter A (amps)

2

0.8

reading on ammeter A (amps)

3

0.8

correct pair of readings

0.8

0.4

0.4

0.8

0.4

0.4

1 mark maximum 4 marks

Q3.

Oil is an important energy resource. It provides about 38% of the energy used for transport,

heating and generating electricity.

(a) The energy stored in oil came from the Sun. Describe how energy from the Sun became stored in oil.

.....................................................................................................................

.....................................................................................................................

.....................................................................................................................

.....................................................................................................................

2 marks

(b) (i) Oil can be described as a non-renewable energy resource. Explain why. ............................................................................................................ ............................................................................................................

1 mark

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(ii) Tick the boxes by two other non-renewable energy resources.

coal

wind

solar

tidal

natural gas

wave

2 marks Maximum 5 marks

## Fossil fuels are used to generate electricity, but over half of the world's population uses biomass as a fuel. (a) What is `biomass', which is used as a fuel? ...................................................................................................................... ......................................................................................................................

(b) Biomass and fossil fuels are both energy resources. What is the original source of this energy? ...................................................................................................................... ......................................................................................................................

(c) Give the names of three fossil fuels which are often burned to generate electricity. 1. ........................................................ 2. ........................................................ 3. ........................................................

(d) Fossil fuels are often described as non-renewable energy resources. Explain why they are called `non-renewable'. ...................................................................................................................... ......................................................................................................................

1 mark 1 mark 1 mark 1 mark

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(e) There are advantages and disadvantages of burning different fuels.

(i) Give one advantage of using biomass rather than fossil fuel as an energy resource.

.............................................................................................................

.............................................................................................................

1 mark

(ii) Give one advantage of using fossil fuel rather than biomass as an energy resource.

.............................................................................................................

.............................................................................................................

1 mark

(iii) Give one disadvantage of using both fossil fuel and biomass. ............................................................................................................. .............................................................................................................

1 mark Maximum 7 marks

Q5.

When a car is being driven along, two horizontal forces affect its motion.

One is air resistance and the other is the forward force.

(a) (i) Explain how molecules in the air cause air resistance. ............................................................................................................. .............................................................................................................

(ii) Explain why air resistance is larger when the car is travelling faster. ............................................................................................................. .............................................................................................................

(b) (i) Compare the sizes of the forward force and the air resistance when the car is speeding up. The forward force is ............................................................................. .............................................................................................................

1 mark 1 mark

1 mark Page 7 of 14

(ii) Compare the sizes of the two forces while the car is moving at a steady 30 miles per hour.

The forward force is ............................................................................

............................................................................................................

1 mark

(c) The forward force has to be larger when the car is travelling at a steady 60 mph than when it is travelling at a steady 30 mph. Why is this?

......................................................................................................................

......................................................................................................................

1 mark

(d) The forward force is the result of the tyres not being able to spin on the road surface. What is the name of the force that stops the tyres spinning?

.....................................................................

1 mark Maximum 6 marks

Q6.

Oliver clamped a wooden plank to a desk. There was a 40 cm overhang as shown in

diagram 1.

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