NECO SSCE - Physics - 2001 (Objective)

Question 1 Report

The main function of the commutator in a simple d.c. motor is to

enable the armature to rotate freely

increase the flux linking the armature windings

maintain a direct current in the armature

provide uniform magnetic field around the armature

reverse the direction of the current in the armature. Correct answer

Answer Details

Read lesson note on Electrostatics (JAMB)

Electrostatics

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Question 2 Report

A lead-acid accumulator is used in preference to a dry battery in a car because

a dry battery cannot supply the necessary high voltage

a dry battery would not operate on a cold frosty morning

the accumulator can give a bigger current and can be recharged Correct answer

the accumulator can supply a.c

the chemicals used in a dry battery constitute a fire hazard.

Answer Details

Read lesson note on Current Electricity (JAMB)

Read lesson note on Electric Cells (JAMB)

Current Electricity

Electric Cells

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Question 3 Report

Which statement is TRUE of a block of stone of mass m, with zero momentum?

The acceleration of the stone is non-uniform

The stone is stationary Correct answer

The stone moves at a constant velocity

The stone moves with maximum velocity

The stone moves with minimum velocity.

Answer Details

Read lesson note on Newton’s Laws Of Motion (WAEC)

Read lesson note on Motion (JAMB)

Newton’s Laws Of Motion

Motion

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Question 4 Report

An electron of charge a = 1.6 × 10^-19C is situated in a uniform electric field of intensity 2.4 × 105 V m^-1. What is the force on the electron?

1.60 × 10^-19N

3.84 × 10¹⁹N

1.92 × 10^-14N

3.84 × 10^-14N Correct answer

7.68 × 10^-14N

Answer Details

Read lesson note on Electrostatics (JAMB)

Electrostatics

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Question 5 Report

Which is a stringed Instrument?

drum

flute

piano Correct answer

saxophone

trumpet

Answer Details

Read lesson note on Motion (JAMB)

Motion

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Question 6 Report

When water is heated between 0°C and 4°C, it's density

increases for a while and then decreases Correct answer

decreases for a while and then increases

increases

decreases

remains constant.

Answer Details

Read lesson note on Temperature And Its Measurement (JAMB)

Temperature And Its Measurement

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Question 7 Report

A body whose initial velocity is u is uniformly accelerated to a final velocity v in t seconds. If the distance travelled is s, and the acceleration is a, which equation is INCORRECT for the motion of the body?

s = ut+\(\frac{1}{2}\)at²

v² = u² + 2as

v =u + at

v = u + 2as Correct answer

s = \(\frac{1}{2}\)(u+v)t

Answer Details

Read lesson note on Scalars And Vectors (WAEC)

Read lesson note on Rectilinear Acceleration (WAEC)

Read lesson note on Position, Distance And Displacement (WAEC)

Read lesson note on Speed And Velocity (WAEC)

Scalars And Vectors

Rectilinear Acceleration

Position, Distance And Displacement

Speed And Velocity

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Question 8 Report

The statement that the mechanical advantage of a machine is 3 means that the

efficiency is 33\(\frac{1}{3}\)%

effort is three times as large as the load

mechanical advantage is 3 times as large as the velocity ratio

ratio of the effort to the load is 1: 3 Correct answer

Velocity ratio is 3

Answer Details

Read lesson note on Work, Energy And Power (WAEC)

Read lesson note on Simple Machines (JAMB)

Work, Energy And Power

Simple Machines

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Question 9 Report

What gives rise to the line spectra observed in atoms?

change of an electron from a higher to a lower energy level in the atom Correct answer

disturbed protons in the nucleus

excitation of an electron in the atom

kinetic energy of a moving atom

potential energy of an electron inside an atom

Answer Details

Read lesson note on Structure Of The Atom (Nigeria Only) (WAEC)

Structure Of The Atom (Nigeria Only)

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Question 10 Report

Given the same amount of beat, a quantity of water will reach a higher temperature in a brass pot than in a clay pot of the same mass because

brass is less dense than clay

clay expands more slowly than brass

clay loses heat faster than brass

the specific heat capacity of brass is higher than that of clay

the specific heat capacity of brass is lower than of clay. Correct answer

Answer Details

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Question 11 Report

The wavelength of a stationary wave is 24.0cm. What is the distance between a node and the next antinodes?

6.0cm Correct answer

12.0cm

18.0cm

24.0cm

48.0cm

Answer Details

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Question 12 Report

If N.E.P.A. charges 65 kobo per kilowatt-hour for electricity supplied to consumers, what bill would an electric iron rated at 750 watts attract when used for 24 hours?

N9.70

N11.70 Correct answer

N12.40

N15.90

N17.60

Answer Details

Read lesson note on Current Electricity (JAMB)

Current Electricity

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Question 13 Report

What is X in the equation given below? 42He + 94Be → 126C + X

electron

hydrogen

lithium

neutron Correct answer

proton

Answer Details

Read lesson note on Structure Of The Atom (Nigeria Only) (WAEC)

Structure Of The Atom (Nigeria Only)

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Question 14 Report

What is the angular velocity of an object in a horizontal circular path of radius 1.5m with a constant speed of 12ms^-1?

1.6 rads^-1

4.0 rads^-1

8.0 rads^-1 Correct answer

16.0rads^-1

32.0 rads^-1

Answer Details

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Question 15 Report

An object 3.00m high is placed at a distance of 7.50m from a pin-hole camera. If the image height is 6.00 cm, what is the distance of the film from the pin-hole?

3.75cm

7.50cm

15.00cm Correct answer

30.00cm

150.00 cm

Answer Details

Read lesson note on Electrostatics (JAMB)

Electrostatics

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Question 16 Report

The magnetic effect of a current-carrying coil is NOT utilized in the making of a/an

carbon microphone

electric bells

magnetic relay

telephone earpiece

thermostat Correct answer

Answer Details

Read lesson note on Magnets And Magnetic Fields (JAMB)

Magnets And Magnetic Fields

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Question 17 Report

Which scientist discovered natural radioactivity?

Enrico Fermi

Henri Becquerel Correct answer

Marie Curie

Micheal Faraday

Niels Bohr

Answer Details

Read lesson note on Structure Of The Atom (Nigeria Only) (WAEC)

Read lesson note on Electromagnetic Field (Part 2) (WAEC)

Read lesson note on Simple A.C Circuits (JAMB)

Structure Of The Atom (Nigeria Only)

Electromagnetic Field (Part 2)

Simple A.C Circuits

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Question 18 Report

An astronaut is walking on the moon where the magnitude of the acceleration due to gravity "g’ is one-sixth that on earth. Compared with their magnitudes on the earth, his mass and weight on the moon are

both less

less and the same respectively

the same and less respectively Correct answer

the same as on earth

both greater.

Answer Details

Read lesson note on Gravitational Field (JAMB)

Gravitational Field

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Question 19 Report

How much heat is required to convert 5.0g of ice at 0 ° C to water at the boiling point? (Specific latent heat of ice = 336Jg^-1 specific heat capacity of water = 4.2Jg^-1K^-1)

420 J

1680 J

1701 J

2100 J

3780 J Correct answer

Answer Details

Read lesson note on Quantity Of Heat (JAMB)

Quantity Of Heat

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Question 20 Report

A metal has a work function of 3.0 eV. What is the threshold frequency of the metal when electrons are just liberated from the metal.(1 eV = 1.6 × 10-19J; h = 6.6 × 10-34Js)

4.8 × 10^-19Hz

9.3 × 10^-7Hz

4.8 × 10¹⁴Hz

7.3 × 10¹⁴Hz Correct answer

9.3 × 10¹⁴Hz

Answer Details

Read lesson note on Structure Of The Atom (Nigeria Only) (WAEC)

Structure Of The Atom (Nigeria Only)

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Question 21 Report

The lower and upper fixed points of a mercury-in-glass thermometer are marked X and 180 mm respectively. On a particular day the mercury meniscus in the thermometer rises to 60mm. If the corresponding reading on a Celsius scale is 20 ° C, what is the value X?

6.0mm

18.0mm

30.0mm Correct answer

60.0mm

120.0mm

Answer Details

Read lesson note on Temperature And Its Measurement (JAMB)

Temperature And Its Measurement

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Question 22 Report

The falling of light energy on a metal such that electrons are liberated from the metal is called

electron effect

metal electron effect

metal emission

photoelectric effect

photoemission Correct answer

Answer Details

Read lesson note on Light Energy (JAMB)

Light Energy

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Question 23 Report

An object placed 15cm from a converging lens forms a real image whose magnification is 2.0. What is the focal length of the lens?

5.00cm

10.00cm Correct answer

15.00 cm

18.00 cm

20.00cm

Answer Details

Read lesson note on Electrostatics (JAMB)

Electrostatics

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Question 24 Report

What part of a camera functions in a similar way to the retina of the eye?

diaphragm

film Correct answer

focusing ring

lens

shutter

Answer Details

Read lesson note on Structure Of The Nucleus (WAEC)

Structure Of The Nucleus

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Question 25 Report

The inside of a vacuum flask is usually coated with silver to reduce heat loss by

condensation

conduction

convection

evaporation

radiation Correct answer

Answer Details

Read lesson note on Heat Transfer (JAMB)

Read lesson note on Heat Energy (WAEC)

Heat Transfer

Heat Energy

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Question 26 Report

An object is placed 15cm in front of a concave mirror of focal length 20cm. The image formed is

real, inverted and diminished

real, inverted and magnified

virtual, erect and diminished

virtual, erect and magnified Correct answer

virtual, inverted and magnified

Answer Details

Read lesson note on Electrostatics (JAMB)

Electrostatics

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Question 27 Report

Totally reflecting prisms are preferred to mirrors in periscopes because

I. mirror givegive multiple images
II. silvering on mirrors is easy damaged
III. mirrors reflect less light than totally reflecting prisms

I only

I and II only

I and III only

II and III only Correct answer

I,II and III

Answer Details

Read lesson note on Reflection Of Light At Plane And Curved Surfaces (JAMB)

Read lesson note on Properties Of Waves: Reflection, Refraction, Diffraction (WAEC)

Reflection Of Light At Plane And Curved Surfaces

Properties Of Waves: Reflection, Refraction, Diffraction

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Question 28 Report

The speed of sound travelling in various media increases in the order:

air, iron bar, water

air, water, iron bar Correct answer

iron, bar water, air

water, air, iron bar

water, iron bar, air

Answer Details

Read lesson note on Gas Laws (JAMB)

Read lesson note on Fluid At Rest (WAEC)

Gas Laws

Fluid At Rest

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Question 29 Report

50cm³ of air at a pressure of 5Nm^-2 is enclosed in a metal tube by a piston. If the piston is pushed in a distance of 10cm, what will the pressure of the air become, if the cross-sectional area of the tube is 2cm^-2? (Assume that the temperature remains constant throughout)

12.5 Nm^-2 Correct answer

8.7 Nm^-2

8.3 Nm^-2

3.8Nm^-2

3.0Nm^-2

Answer Details

Read lesson note on Pressure (JAMB)

Pressure

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Question 30 Report

N.N.P.C. gas cylinder containing 15kg of cooking gas was left open, and the gas emptied in 3.8 minutes, at an average speed of 20 ms^-1. What force was exerted on the gas in the cylinder?

132N

13.2N

1.32N Correct answer

0.132N

0.013N

Answer Details

Read lesson note on Motion (JAMB)

Motion

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Question 31 Report

Which statement about the concept of temperature is NOT true?

Temperature decides the direction of heat flow between two bodies

Temperature is a measure of coldness of a body

Temperature is a vector quantity Correct answer

Temperature is a measure of hotness of a body.

Temperature scales include Fahrenheit, Celsius and Kelvin

Answer Details

Read lesson note on Scalars And Vectors (JAMB)

Read lesson note on Temperature And Its Measurement (JAMB)

Scalars And Vectors

Temperature And Its Measurement

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Question 32 Report

Which statement is a correct consequence of the uncertainly principle?

A particle’s kinetic energy cannot be measured accurately at any time Correct answer

Both momemtum and energy of a particle can be known with absolute certainly

It is possible to measure exactly both the position and momentum of a particle at the same time

The complete knowledge of the position of a particle implies the complete ignorance of its energy

The uncertainty in our knowledge of energy and the duration taken to measure it, are each less than Planck’s constant.

Answer Details

Read lesson note on Simple A.C. Circuits (WAEC)

Simple A.C. Circuits

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Question 33 Report

In 24 days a radioactive isotope decreases in mass from 128g to 2g. What is the half-life of the radioactive material?

2.54 days

4.00 days Correct answer

4.80 days

6.00 days

8.00 days

Answer Details

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Question 34 Report

A 220 V, 60 Hz alternating current supply is connected to an inductor of 3.5H. What is the current passing through the inductor?

0.0167 A

0.1670 A Correct answer

1.6700 A

16.7000 A

167.0000 A

Answer Details

Read lesson note on Introductory Electronics (JAMB)

Read lesson note on Simple A.C Circuits (JAMB)

Introductory Electronics

Simple A.C Circuits

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Question 35 Report

The invisible part of the spectrum of white light consists of

Infra-red and ultra-violet only Correct answer

Infra-red, ultra-violet and blue only

red, orange and green only

red and violet only

yellow and indigo only

Answer Details

Read lesson note on Electromagnetic Waves: Types Of Radiation In Electromagnetic Spectrum (WAEC)

Electromagnetic Waves: Types Of Radiation In Electromagnetic Spectrum

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Question 36 Report

Notes of the same frequency sounded on a piano and on a flute may differ in

I. pitch
II. quality
III. Loudness

I only

II only Correct answer

I and III only

II and III only

I, II and III

Answer Details

Read lesson note on Reflection Of Light At Plane And Curved Surfaces (JAMB)

Reflection Of Light At Plane And Curved Surfaces

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Question 37 Report

Which is NOT one of the laws of solid friction?

The frictional force between two surfaces opposes their relative motion

The ratio of frictional force to the normal reaction varies for two given surfaces Correct answer

The ratio of frictional force to the normal reaction is constant for two given surfaces

The limiting frictional force is independent of the area of surface in contact.

Dynamic frictional force is independent of the relative velocity of the surfaces in contact.

Answer Details

Read lesson note on Friction (JAMB)

Friction

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Question 38 Report

A wave is represented by the equation y = 0.5 sin 0.4 Ω(X - 60t), where the distance (X) is measured in centimetres and time (t) in seconds. What is the wave length of the wave?

0.2cm

0.4cm

0.8cm

5.0cm Correct answer

10.0cm

Answer Details

Read lesson note on Production And Propagation Of Waves (WAEC)

Production And Propagation Of Waves

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Question 39 Report

A transformer is connected to a 250 V a.c. supply. The primary coil has 5000 turns and the secondary voltage is found to be 10 V. What is the number of turns in the secondary coil?

100

150

200 Correct answer

250

300

Answer Details

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Question 40 Report

What is the energy stored in a 10μ F capacitor if the potential difference between the plates is 40 V?

2.0 × 10^-4J

8.0 ×10^-4J

4.0 × 10^-3J

8.0 × 10^-3J Correct answer

1.6 × 10^-2J

Answer Details

Read lesson note on Capacitors (JAMB)

Capacitors

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Question 41 Report

Which statement is NOT correct about molecules?

The number of molecules in a unit volume of a solid is greater than that in a unit volume of a liquid or gas.

Molecules are made up of atoms

The force of attraction between two molecules of a solid is greater than that between two molecules of a liquid or gas

Molecules of gases are in regular motion Correct answer

Molecules of a solid vibrate about their mean positions.

Answer Details

Read lesson note on Thermal Expansion (JAMB)

Read lesson note on Structure Of Matter And Kinetic Theory (JAMB)

Thermal Expansion

Structure Of Matter And Kinetic Theory

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Question 42 Report

Which statements(s) is/are NOT true?

I. A saturated vapour is one that is in equilibrium with its liquid in a closed space. II. A vapour contains molecules with varying kinetic energy and their distances apart are smaller than those of the molecules of a liquid
III. Relative Humidity = \(\frac{\text{Saturated vapour pressure at dew point}} {\text{Saturated vapour pressure at air temperature}}\) x 100%

IV. The saturated vapour pressure of water increases with temperature

I only

II only Correct answer

II and III only

III and IV only

II, III and IV only

Answer Details

Read lesson note on Vapours (JAMB)

Vapours

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Question 43 Report

When an astronomical telescope is in normal adjustment, the focal length of the objective lens is 50cm and that of the eye piece is 5.0cm. What is the distance between the lenses?

10.0cm

30.0cm

45.0cm

55.0cm Correct answer

250.0cm

Answer Details

Read lesson note on Electrostatics (JAMB)

Electrostatics

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Question 44 Report

A cell can supply currents of 0.60 A and 0.30 A through a 2.0 ω and a 5.0 ω resistor respectively. What is the internal resistance of the cell?

0.2 ω

0.4 ω

1.0 ω Correct answer

3.0 ω

9.0 ω

Answer Details

Read lesson note on Current Electricity (JAMB)

Read lesson note on Electric Cells (JAMB)

Current Electricity

Electric Cells

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Question 45 Report

Which material is best for making a permanent magnet?

aluminium

cobalt

copper

soft iron

steel Correct answer

Answer Details

Read lesson note on Magnets And Magnetic Fields (JAMB)

Magnets And Magnetic Fields

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Question 46 Report

A waterfall is 630m high. What is the change in temperature of a quantity of water that falls from the top to the bottom of the waterfall? (Neglect heat losses to the surroundings, take g as 10 ms-2 and specific heat capacity of weather as 4200,J kg-1K-1

0.15°C Correct answer

1.50°C

15.00°C

21.00 °C

50.00°C

Answer Details

Read lesson note on Temperature And Its Measurement (JAMB)

Temperature And Its Measurement

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