A LevelPhysicsOCRExam Questions2. Foundations of Physics2.1 Physical Quantities & Units

Physical Quantities & Units (OCR A Level Physics)

Exam Questions

14 mins14 questions
Easy
Medium
Hard
11 mark

Which one of the following prefixes represents the smallest multiplication factor?

  • femto (f)

  • micro (μ)

  • nano (n)

  • pico (p)

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21 mark

An athlete is running at a speed of about 5 ms–1.

What is a reasonable estimate for the kinetic energy of this athlete?

  • 12 J

  • 100 J

  • 900 J

  • 800 000 J

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31 mark

Which set of prefixes A, B, C or D are in order of increasing magnitude?

  • micro, milli, centi, kilo

  • milli, centi, micro, kilo

  • kilo, centi, milli, micro

  • centi, micro, milli, kilo

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41 mark

Which of the following shows the correct base units for pressure?

  • kgm–2

  • kgm–2 s–2

  • kgm–1 s–2

  • kgm2 s–3

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51 mark

Which of the following units is not an S.I. base unit?

  • ampere

  • mole

  • volt

  • kilogram

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61 mark

Which of the following is a correct unit for gravitational field strength?

  • J kg−1

  • N kg−1

  • N m2 kg−2

  • kg m s−1

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1
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Which electrical quantity has S.I. units ampere-second (A s)?

  • charge

  • current

  • resistance

  • potential difference

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2
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Which pair of quantities have the same S.I. base units?

  • force, strain

  • force, stress

  • pressure, stress

  • strain, upthrust

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3
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Which of the following options is the SI unit of charge?

  • Coulomb, C

  • Ampere, A

  • Ohm, Ω

  • Electronic charge, e

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4
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Which of the following units is not a derived SI unit?

  • J

  • Hz

  • A

  • Pa

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5
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What is the number of cm3 in 100 litres? 

  • 105

  • 0.1

  • 103

  • 102

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6
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The gravitational field strength on the surface of Mars is 38% of that on the surface of the Earth. By estimating the average mass of a human being,  which of the following is most likely to be equal to the average weight of a human on the surface of Mars?

  • 26 N

  • 260 N

  • 687 N

  • 2687 N

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7
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Which of the following is equivalent to 80 GeV?

  • 8 × 1010 V

  • 40 × MJ

  • 12.8  nJ

  • 1.28  μJ

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1
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The following equation relates the force of air resistance acting on an object F to the speed of the object in air v.

 F equals negative b v squared

What are the SI base units of b that make the equation homogeneous?

  • m s-1

  • s m-1

  • kg m s-1

  • kg m-1

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