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DP IB Physics: HL

Topic Questions

Home / IB / Physics: HL / DP / Topic Questions / 1. Measurement & Uncertainties / 1.1 Measurements in Physics / Multiple Choice


1.1 Measurements in Physics

Question 1

Marks: 1

The frictional force F on a sphere falling through a fluid is given by the formula:

F6 pi a eta nu 

In this equation, a is the radius of the sphere, η is a constant relating to the fluid and v is the velocity of the sphere.

What are the units of η?

  • kg m s–1

  • kg m–1 s–1

  • kg m s–3

  • kg m–3 s–3

Choose your answer
  
Key Concepts
SI Units

Question 2

Marks: 1

The speed v of a liquid leaving a tube depends on the change in pressure ΔP and the density ρ of the liquid. The speed is given by the equation:

v = k left parenthesis fraction numerator increment P over denominator rho end fraction right parenthesis to the power of n

In this equation, k is a constant that has no units.

What is the value of n?

  • 1 half

  • 1

  • 3 over 2

  • 2

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Key Concepts
SI Units

Question 3

Marks: 1

Which estimate is realistic?

  • The kinetic energy of a bus travelling on an motor way is 30 000 J

  • The power of a domestic light is 300 W

  • The temperature of a hot oven is 300 K

  • The volume of air in a car tyre is 0.03 m3

Choose your answer
  

Question 4

Marks: 1

The theory of gas flow through small diameter tubes at low pressures is an important consideration of high vacuum techniques.

One equation used in this theory is:

Q = fraction numerator k r cubed left parenthesis p subscript 1 minus p subscript 2 right parenthesis over denominator L end fraction square root of fraction numerator M over denominator R T end fraction end root

Where k is a unitless constant, r is the radius of the tube, p1 and p2 are the pressures at each end of the tube, L is the length of the tube, M is the molar mass of the gas, R is the molar gas constant and T is the thermodynamic temperature of the gas.

What are the base units of Q?

  • kg s–1

  • kg m s–1

  • kg mol–1

  • kg m s–2

Choose your answer
  
Key Concepts
SI Units

Question 5

Marks: 1

What is the correct value for the Gravitational constant?

  • 6.67 × 10–3 nN m2 kg–2

  • 6.67 × 105 N mm2 kg–2

  • 6.67 × 10–20 kN mm2 kg–2

  • 6.67 × 10–17 N km2 kg–2

Choose your answer
  

Question 6

Marks: 1

A boy jumps from a wall 5 m high. What is an estimate of the change in momentum of the boy when he lands without rebounding?

  • 4 × 100 kg m s–1

  • 4 × 101 kg m s–1

  • 4 × 102 kg m s–1

  • 4 × 103 kg m s–1

Choose your answer
  

Question 7

Marks: 1

When a constant braking force is applied to a vehicle moving at speed v, the distance d moved by the vehicle as it comes to rest is given by the expression:

d = kv2

In this equation, k is a constant.

When d is measured in metres and v is measured in metres per second, the constant has a value of k1.

What is the value of the constant when the distance is measured in metres, and the speed is measured in kilometres per hour?

  • fraction numerator k subscript 1 over denominator 12.96 end fraction

  • fraction numerator k subscript 1 over denominator 3.6 end fraction

  • 3.6k1

  • 12.96k1

Choose your answer
  
Key Concepts
SI Units

Question 8

Marks: 1

What is the unit for the gas constant in fundamental SI units?

  • kg m s–2 K mol–1

  • kg m2 s–2 K–1 mol–1

  • kg2 m2 s–1 K–1 mol

  • kg m2 s–2 mol–1

Choose your answer
  
Key Concepts
SI Units

Question 9

Marks: 1

Which of the following gives the correct unit for g cubed over G?

  • kg s–4

  • kg–1 s–4

  • kg m3 s–4

  • kg s–8

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Key Concepts
SI Units

Question 10

Marks: 1

The drag coefficient Cd is a number with no units. It is used to compare the drag on different cars at different speeds. It is given by the equation

 Cdfraction numerator 2 F over denominator rho v to the power of n A end fraction

F is the drag force on the car, ρ is the density of the air, A is the cross-sectional area of the car and v is the speed of the car.

 What is the value of n?

  • 1

  • 2

  • 3

  • 4

Choose your answer
  
Key Concepts
SI Units