WJEC 3455QD · course-matched practice

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Actual marks18

Questions18

Topics represented9

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Question 1 · Atomic structure and radiation · 1 mark

A sample's corrected count rate falls from 800 counts/s to 100 counts/s. How many half-lives have elapsed?

Your answer Working

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Answer: 3

800 → 400 → 200 → 100, so three half-lives have elapsed.

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Question 2 · Electric circuits · 1 mark

A 4.0 Ω resistor has a potential difference of 12 V across it. Calculate the current.

Your answer

Use unit: A

Working

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Answer: 3 A

I = \(\dfrac{V}{R}\) = \(\dfrac{12}{4.0}\) = 3.0 A.

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Question 3 · Energy · 1 mark

A 600 W heater runs for 3.0 s. How much energy does it transfer?

Your answer

Use unit: J

Working

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Answer: 1800 J

E = Pt = 600 × 3.0 = 1800 J.

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Question 4 · Energy resources · 1 mark

A generator receives 2.0 MW of power and provides 1.5 MW of useful electrical power. Calculate its efficiency as a percentage.

Your answer

Use unit: %

Working

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Answer: 75 %

Efficiency = useful output / input × 100 = \(\dfrac{1.5}{2.0}\) × 100 = 75%.

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Question 5 · Forces and motion · 1 mark

A cyclist increases speed from 4.0 m/s to 10.0 m/s in 3.0 s. Calculate the acceleration.

Your answer

Use unit: m/s^2

Working

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Answer: 2 m/s^2

a = \(\dfrac{10.0 - 4.0}{3.0}\) = 2.0 m/s².

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Question 6 · Practical skills and data · 1 mark

A student measures 4.2 s, 4.4 s and 4.3 s. Calculate the mean time.

Your answer

Use unit: s

Working

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Answer: 4.3 s

Mean = \(\dfrac{4.2 + 4.4 + 4.3}{3}\) = 4.3 s.

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Question 7 · Magnetism and electromagnetism · 1 mark

A wire of length 0.20 m carries 3.0 A perpendicular to a 0.50 T magnetic field. Calculate the force on the wire.

Your answer

Use unit: N

Working

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Answer: 0.30 N

F = BIL = 0.50 × 3.0 × 0.20 = 0.30 N.

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Question 8 · Space physics · 1 mark

A spectral line normally has wavelength 500 nm but is observed at 505 nm from a galaxy. Calculate the increase in wavelength.

Your answer

Use unit: nm

Working

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Answer: 5 nm

Increase = 505 − 500 = 5 nm.

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Question 9 · Waves · 1 mark

Sound travels at 340 m/s. A tone has frequency 170 Hz. Calculate its wavelength.

Your answer

Use unit: m

Working

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Answer: 2 m

λ = \(\dfrac{v}{f}\) = \(\dfrac{340}{170}\) = 2.0 m.

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Question 10 · Atomic structure and radiation · 1 mark

What is an alpha particle?

Choose one answer A. A high-energy electron B. Two protons and two neutrons C. A high-frequency photon D. One proton and one electron

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Answer: B

An alpha particle is a helium nucleus containing two protons and two neutrons.

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Question 11 · Electric circuits · 1 mark

Which statement is correct for components connected in series?

Choose one answer A. Potential difference is always the same across each component B. Current is the same through each component C. Total resistance is less than every individual resistance D. Current is split equally regardless of resistance

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Answer: B

There is one path in a series circuit, so the current is the same at every point.

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Question 12 · Energy · 1 mark

What does it mean when energy is dissipated?

Choose one answer A. It has been destroyed B. It has turned into mass C. It has stopped being conserved D. It has been transferred to less useful stores and spread out

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Answer: D

Dissipated energy is transferred and spread out, commonly into thermal stores; total energy remains conserved.

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Question 13 · Energy resources · 1 mark

Which energy resource is non-renewable?

Choose one answer A. Wind B. Solar C. Tidal D. Uranium fuel

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Answer: D

Uranium is a finite fuel; wind, solar and tidal resources are replenished naturally.

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Question 14 · Forces and motion · 1 mark

A car travels in a straight line at constant velocity. What must be true about the forces on it?

Choose one answer A. There are no forces B. The driving force is larger than drag C. The resultant force is zero D. The weight is zero

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Answer: C

Constant velocity means zero acceleration, so the resultant force is zero.

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Question 15 · Practical skills and data · 1 mark

In an investigation of how wire length affects resistance, which variable is deliberately changed?

Choose one answer A. Resistance B. Meter resolution C. The conclusion D. Wire length

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Answer: D

Wire length is the independent variable because it is deliberately changed.

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Question 16 · Magnetism and electromagnetism · 1 mark

Which statement about magnetic field lines is correct?

Choose one answer A. They cross wherever the field is strongest B. They show the path travelled by electrons C. Outside a bar magnet they point from north to south D. They exist only inside magnets

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Answer: C

Field lines show field direction and, outside a bar magnet, run from north to south.

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Question 17 · Space physics · 1 mark

What provides the centripetal force for a planet orbiting the Sun?

Choose one answer A. Magnetic attraction B. The planet's forward motion C. Solar wind D. Gravity

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Answer: D

The gravitational attraction between the Sun and planet provides the inward force required for the orbit.

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Question 18 · Waves · 1 mark

Which is a transverse wave?

Choose one answer A. Sound in air B. An electromagnetic wave C. A compression wave in a spring D. A pressure pulse in water

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Answer: B

Electromagnetic waves are transverse; sound in air is longitudinal.

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