Question 1

The diagram below shows an object submerged in water.


The object is stationary in the water.

Which statement about the upthrust acting on the object is correct?

  A  

it is zero

  B  

it is equal to the mass of the object

  C  

it is equal to the weight of the object

  D  

it is equal to the volume of the water displaced

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Question 2

The diameter of a solid metal sphere is measured using a micrometer screw gauge. The diagram shows an enlargement of the shaft of the micrometer screw gauge when taking the measurement.

The mass of the sphere is 0.450 g.

What is the density of the metal used to make the sphere?

  A  

965 kg m–3

  B  

1,340 kg m–3

  C  

7,720 kg m–3

  D  

10,700 kg m–3

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Question 3

A small block of wood is placed in deep water.

The block is at rest with 80% of its volume under the surface of water.

The weight of the block is 6.0 N.

What is the upthrust acting on the block?

  A  

0 N

  B  

1.2 N

  C  

4.8 N

  D  

6.0 N

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Question 4

The density of paper is 800 kg m–3. A typical sheet of paper has a width of 210 mm and a length of 300 mm.

The thickness of a pack of 500 sheets of paper is 50 mm.

What is the mass of a single sheet of paper?

  A  

0.5 g

  B  

5 g

  C  

50 g

  D  

500 g

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Question 5

A metal block has a mass of 750 g. 60% of the mass is magnesium and the remainder is copper.

The density of magnesium is 1.7 g cm-3.

The density of copper is 9.0 g cm-3.

What is the density of the block?

  A  

2.5 g cm-3

  B  

4.6 g cm-3

  C  

5.4 g cm-3

  D  

10.7 g cm-3

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Question 6

1.5 m3 of water is mixed with 0.50 m3of alcohol. The density of water is 1000 kg m–3 and the density of alcohol is 800 kg m–3.

What is the density of the mixture with volume 2.0 m3 ?

  A  

850 kg m–3

  B  

900 kg m–3

  C  

940 kg m–3

  D  

950 kg m–3

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Question 7

The density of the material of a coil of thin wire is to be found.

Which set of instruments could be used to do this most accurately?

  A  

metre rule, protractor, spring balance

  B  

micrometer, metre rule, top-pan balance

  C  

stopwatch, newton-meter, vernier calipers

  D  

tape measure, vernier calipers, lever balance

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Question 8

The diagram represents a sphere under water. P, Q, R and S are forces acting on the sphere, due to the pressure of the water.

Each force acts perpendicularly to the sphere’s surface. P and R act in opposite directions vertically. Q and S act in opposite directions horizontally.

Which information about the magnitudes of the forces is correct?

  A  

P < R and S = Q

  B  

P > R and S = Q

  C  

P = R and S = Q and P ≠ S


  D  

P = R and S = Q and P = S


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