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ZIMSEC O Level · 4023/1

Physics Paper 1 Specimen 2021

Questions
39 of 40
Time allowed
60 min
Syllabus code
4023/1

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Questions
39
Pass mark
24
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Answer every question in the printed order, get marked at the end, then see the answers.

The questions

Question 1

Measurement
Which of the quantities is a base quantity?
  1. Aenergy
  2. Bforce
  3. Ctime
  4. Dvolume

Question 2

Measurement
What is the reading shown on the vernier scale?
  1. A3.34 cm
  2. B3.42 cm
  3. C3.70 cm
  4. D3.73 cm

Question 4

Motion
Which statement is true about two objects of different masses in free fall near the earth's surface?
  1. Agreater acceleration for the bigger object
  2. Bgreater acceleration for the smaller object
  3. Cless acceleration for the mass with less speed
  4. Dsame acceleration for both masses

Question 5

Deformation

A load of 50 N is added to a steel spring of length 10 cm, its length increases to 17 cm.

What is the spring constant?

  1. A0.14 N/cm
  2. B2.94 N/cm
  3. C5.00 N/cm
  4. D7.14 N/cm

Question 6

Forces
Which of the following can not be changed by a force?
  1. Aacceleration
  2. Bmass
  3. Cmomentum
  4. Dvolume

Question 7

Moments

The diagram shows a system in equilibrium.

What is the mass ratio m2m1\dfrac{m_2}{m_1}?

  1. A23\dfrac{2}{3}
  2. B32\dfrac{3}{2}
  3. C12\dfrac{1}{2}
  4. D21\dfrac{2}{1}

Question 8

Pressure

The diagram shows a U-tube manometer.

What is the formula for calculating gas pressure?

  1. Aρgh\rho g h
  2. Bh+ρghh + \rho g h
  3. CPA+hρgP_A + h\rho g
  4. Dρgh−h\rho g h - h

Question 9

Machines

The diagram shows a pulley system.

What is the V.R?

  1. A1.6
  2. B2.0
  3. C3.0
  4. D5.0

Question 10

Structures

The diagram below shows a truss.

Which part A, B, C or D shows where compressional forces are acting?

  1. AA
  2. BB
  3. CC
  4. DD

Question 11

Structures
Which is the best method of joining steel blocks together?
  1. Abrazing
  2. Bglueing
  3. Csoldering
  4. Dwelding

Question 12

Structures
Bricks are used in construction because they
  1. Aresist compressional forces.
  2. Bresist tensile forces.
  3. Cresist shear forces.
  4. Dresist heat.

Question 13

Work, energy and power

The diagram shows an electric motor supporting a load of 12 000 N at a height of 15 m.

What is the work done by the electric motor?

  1. A0 J
  2. B800 J
  3. C12 000 J
  4. D180 000 J

Question 14

Energy conversion
Which of the following energy conversion takes place in an electric bulb when it is operating?
  1. Alight to heat.
  2. Bheat to light.
  3. Cchemical to light.
  4. Delectrical to heat.

Question 15

Work, energy and power

The diagram shows a girl of weight 400 N running up the stairs of total height of 360 cm.

What is the work done by the girl?

  1. A144 000 J
  2. B14 400 J
  3. C1 440 J
  4. D144 J

Question 16

Heat capacity
Why do temperatures of the sea rise and fall very slowly compared to that of the land?
  1. AWater absorbs large amount of heat for a very small temperature rise.
  2. BLand absorbs large amount of heat for a very small temperature rise.
  3. CSea surface is bigger than land surface.
  4. DLand surface is bigger than sea surface.

Question 17

Heat transfer
In good conductors of heat, thermal energy is transferred by
  1. Adensity changes only.
  2. Bparticle vibration only.
  3. Cdensity change and electron diffusion.
  4. Dparticle vibration and electron diffusion.

Question 18

Engines
Oil is used in car engines because
  1. Ait increases the efficiency of the engine.
  2. Bit cools the engine.
  3. Cit is used as a fuel.
  4. Dit cleans the engine.

Question 19

Engines
A petrol filter is used for
  1. Astoring petrol.
  2. Bcleaning the petrol.
  3. Cspraying petrol into the carburetor.
  4. Dcontrolling amount of petrol into the carburetor.

Question 20

Waves

Light waves in glass have a wavelength of 6.0×10−76.0 \times 10^{-7} m and a speed of 2.0×1082.0 \times 10^{8} m/s. They enter into water and their speed becomes 2.3×1082.3 \times 10^{8} m/s.

What is the wavelength of the waves in water?

  1. A6.9×10−76.9 \times 10^{-7} m
  2. B5.2×10−75.2 \times 10^{-7} m
  3. C1.9×1061.9 \times 10^{6} m
  4. D1.4×1061.4 \times 10^{6} m

Question 21

Waves

The diagram shows the variation of displacement of a wave with time.

What is the frequency of the wave?

  1. A2.0 Hz
  2. B1.0 Hz
  3. C0.5 Hz
  4. D0.02 Hz

Question 22

Sound
Loudness of sound is related to
  1. Aamplitude.
  2. Bfrequency.
  3. Cspeed.
  4. Dwavelength.

Question 23

Reflection

The diagram shows a light ray incident on a glass-water boundary.

Which letter A, B, C or D represents the angle of reflection?

  1. AA
  2. BB
  3. CC
  4. DD

Question 24

Total internal reflection
Which diagram shows a light ray incident on a glass-air boundary at an angle of incidence greater than the critical angle?
  1. AA
  2. BB
  3. CC
  4. DD

Question 25

Lenses
What is the nature of an image formed by a diverging lens?
  1. Amagnified, real
  2. Bmagnified, virtual
  3. Cdiminished, real
  4. Ddiminished, virtual

Question 26

Atomic structure
A neutral atom contain equal number of
  1. Aneutrons and electrons.
  2. Bneutrons and protons.
  3. Cprotons and electrons.
  4. Delectrons and nucleons.

Question 27

Resistance
Which combination results in the resistance of a wire being doubled?
  1. Across-sectional area double; length double
  2. Bcross-sectional area double; length no change
  3. Ccross-sectional area halve; length halve
  4. Dcross-sectional area halve; length no change

Question 28

Electrical energy
An electric kettle is rated 240 V, 10 A. How much will it cost to run it for an hour at 10 cents per unit?
  1. A24 c
  2. B240 c
  3. C2 400 c
  4. D24 000 c

Question 29

Magnetism
Which pair of metals will be picked up by an electromagnet?
  1. Aaluminium and brass
  2. Bbrass and copper
  3. Ccopper and iron
  4. Dnickel and cobalt

Question 30

Magnetism

A compass is placed beside a bar magnet as shown.

In which direction will the compass needle point?

  1. AA
  2. BB
  3. CC
  4. DD

Question 31

Magnetic effect of a current
Which diagram shows field lines for a current carrying conductor with current coming out of the paper?
  1. AA
  2. BB
  3. CC
  4. DD

Question 32

Electromagnetic induction
Which is not a factor affecting magnitude of induced emf?
  1. Aamount of current flowing
  2. Bnumber of turns on the coil
  3. Cspeed of magnet
  4. Dstrength of magnet

Question 33

Alternating current
The advantage of alternating current over direct current is that it
  1. Acan be used for industrial purposes.
  2. Bis used by most electronic components.
  3. Ccan be easily stepped up or down.
  4. Dhas more power.

Question 34

Rectification

The diagram shows an electronic circuit.

The circuit is used in

  1. Afull wave rectification only.
  2. Bhalf wave rectification only.
  3. Cfull wave rectification and smoothing.
  4. Dhalf wave rectification and smoothing.

Question 35

Potential divider

The diagram shows the potential divider circuit.

What is the potential difference across XY?

  1. A5 V
  2. B10 V
  3. C15 V
  4. D30 V

Question 36

Logic gates

The diagram shows a logic circuit.

Which of the outputs A, B, C or D is the correct output for the circuit?

  1. AA
  2. BB
  3. CC
  4. DD

Question 37

Atomic structure
Which pair of nuclides are isotopes?
  1. A2459X^{59}_{24}\mathrm{X} and 2558Y^{58}_{25}\mathrm{Y}
  2. B2459X^{59}_{24}\mathrm{X} and 2359Y^{59}_{23}\mathrm{Y}
  3. C2457X^{57}_{24}\mathrm{X} and 2659Y^{59}_{26}\mathrm{Y}
  4. D2358X^{58}_{23}\mathrm{X} and 2356Y^{56}_{23}\mathrm{Y}

Question 38

Radioactivity
Which type of radiation is a fast moving electron?
  1. Aalpha.
  2. Bbeta.
  3. Cgamma.
  4. Dx-rays.

Question 39

Radioactivity
The most dangerous radiation once inside the human body is
  1. Aalpha.
  2. Bbeta.
  3. Cgamma.
  4. Dx-rays.

Question 40

Radioactivity

The diagram shows radiation from a source passing through different materials.

Which radiation A, B, C or D shows gamma radiation?

  1. AA
  2. BB
  3. CC
  4. DD

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