2001 NECO Physics Past Questions & Answers

Question 1

Totally reflecting prisms are preferred to mirrors in periscopes because I. mirror gives multiple images II. silvering on mirrors is easily damaged III. mirrors reflect less light than totally reflecting prisms

Accepted Answer

E. I,II and III

Answer

A. I only

Answer

B. I and II only

Answer

C. I and III only

Answer

D. II and III only

Question 2

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

Accepted Answer

D. neutron

Answer

A. electron

Answer

B. hydrogen

Answer

C. lithium

Answer

E. proton

Question 3

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

Accepted Answer

C. 8.0 rads-1

Answer

A. 1.6 rads-1

Answer

B. 4.0 rads-1

Answer

D. 16.0rads-1

Answer

E. 32.0 rads-1

Question 4

Which material is best for making a permanent magnet?

Accepted Answer

E. steel

Answer

A. aluminium

Answer

B. cobalt

Answer

C. copper

Answer

D. soft iron

Question 5

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

Accepted Answer

B. The stone is stationary

Answer

A. The acceleration of the stone is non-uniform

Answer

C. The stone moves at a constant velocity

Answer

D. The stone moves with maximum velocity

Answer

E. The stone moves with minimum velocity.

Question 6

50cm3 of air at a pressure of 5$Nm^{-2}$ 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 2$cm^{-2}$? (Assume that the temperature remains constant throughout)

Accepted Answer

C. 8.3 $Nm^{-2}$

Answer

A. 12.5 $Nm^{-2}$

Answer

B. 8.7 $Nm^{-2}$

Answer

D. 3.8$Nm^{-2}$

Answer

E. 3.0$Nm^{-2}$

Question 7

Which is NOT one of the laws of solid friction?

Accepted Answer

B. The ratio of frictional force to the normal reaction varies for two given surfaces

Answer

A. The frictional force between two surfaces opposes their relative motion

Answer

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

Answer

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

Answer

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

Question 8

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)

Accepted Answer

D. 7.3 × 1014Hz

Answer

A. 4.8 × 10-19Hz

Answer

B. 9.3 × 10-7Hz

Answer

C. 4.8 × 1014Hz

Answer

E. 9.3 × 1014Hz

Question 9

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

A.I only
B.II only
C.II and III only
D.III and IV only
E.II, III and IV only

Show answer

Answer: B. II only

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Accepted Answer

B. II only

Answer

A. I only

Answer

C. II and III only

Answer

D. III and IV only

Answer

E. II, III and IV only

Question 10

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?

Accepted Answer

B. N11.70

Answer

A. N9.70

Answer

C. N12.40

Answer

D. N15.90

Answer

E. N17.60

Question 11

Which statement is a correct consequence of the uncertainly principle?

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Answer

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

Question 12

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

Accepted Answer

D. virtual, erect and magnified

Answer

A. real, inverted and diminished

Answer

B. real, inverted and magnified

Answer

C. virtual, erect and diminished

Answer

E. virtual, inverted and magnified

Question 13

Which is a stringed Instrument?

Accepted Answer

C. piano

Answer

A. drum

Answer

B. flute

Answer

D. saxophone

Answer

E. trumpet

Question 14

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

Accepted Answer

C. the same and less respectively

Answer

A. both less

Answer

B. less and the same respectively

Answer

D. the same as on earth

Answer

E. both greater.

Question 15

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?

Accepted Answer

C. 1.0 ω

Answer

A. 0.2 ω

Answer

B. 0.4 ω

Answer

D. 3.0 ω

Answer

E. 9.0 ω

Question 16

What gives rise to the line spectra observed in atoms?

Accepted Answer

A. change of an electron from a higher to a lower energy level in the atom

Answer

B. disturbed protons in the nucleus

Answer

C. excitation of an electron in the atom

Answer

D. kinetic energy of a moving atom

Answer

E. potential energy of an electron inside an atom

Question 17

Which statement about the concept of temperature is NOT true?

Accepted Answer

C. Temperature is a vector quantity

Answer

A. Temperature decides the direction of heat flow between two bodies

Answer

B. Temperature is a measure of coldness of a body

Answer

D. Temperature is a measure of hotness of a body.

Answer

E. Temperature scales include Fahrenheit, Celsius and Kelvin

Question 18

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

Accepted Answer

B. 4.00 days

Answer

A. 2.54 days

Answer

C. 4.80 days

Answer

D. 6.00 days

Answer

E. 8.00 days

Question 19

Which scientist discovered natural radioactivity?

Accepted Answer

B. Henri Becquerel

Answer

A. Enrico Fermi

Answer

C. Marie Curie

Answer

D. Micheal Faraday

Answer

E. Niels Bohr

Question 20

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?

Accepted Answer

D. 3.84 × 10-14N

Answer

A. 1.60 × 10-19N

Answer

B. 3.84 × 1019N

Answer

C. 1.92 × 10-14N

Answer

E. 7.68 × 10-14N

Question 21

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?

Accepted Answer

C. 15.00cm

Answer

A. 3.75cm

Answer

B. 7.50cm

Answer

D. 30.00cm

Answer

E. 150.00 cm

Question 22

Notes of the same frequency sounded on a piano and on a flute may differ in I. pitch II. quality III. Loudness

Accepted Answer

D. II and III only

Answer

A. I only

Answer

B. II only

Answer

C. I and III only

Answer

E. I, II and III

Question 23

Which statement is NOT correct about molecules?

Accepted Answer

D. Molecules of gases are in regular motion

Answer

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

Answer

B. Molecules are made up of atoms

Answer

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

Answer

E. Molecules of a solid vibrate about their mean positions.

Question 24

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

Accepted Answer

B. air, water, iron bar

Answer

A. air, iron bar, water

Answer

C. iron, bar water, air

Answer

D. water, air, iron bar

Answer

E. water, iron bar, air

Question 25

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?

Accepted Answer

C. 200

Answer

A. 100

Answer

B. 150

Answer

D. 250

Answer

E. 300

Question 26

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

Accepted Answer

C. increases

Answer

A. increases for a while and then decreases

Answer

B. decreases for a while and then increases

Answer

D. decreases

Answer

E. remains constant.

Question 27

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

Accepted Answer

B. 0.1670 A

Answer

A. 0.0167 A

Answer

C. 1.6700 A

Answer

D. 16.7000 A

Answer

E. 167.0000 A

Question 28

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

Accepted Answer

D. 8.0 × 10-3J

Answer

A. 2.0 × 10-4J

Answer

B. 8.0 ×10-4J

Answer

C. 4.0 × 10-3J

Answer

E. 1.6 × 10-2J

Question 29

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

Accepted Answer

D. ratio of the effort to the load is 1: 3

Answer

A. efficiency is 33$\frac{1}{3}$%

Answer

B. effort is three times as large as the load

Answer

C. mechanical advantage is 3 times as large as the velocity ratio

Answer

E. Velocity ratio is 3

Question 30

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

Accepted Answer

E. radiation

Answer

A. condensation

Answer

B. conduction

Answer

C. convection

Answer

D. evaporation

Question 31

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

Accepted Answer

D. 5.0cm

Answer

A. 0.2cm

Answer

B. 0.4cm

Answer

C. 0.8cm

Answer

E. 10.0cm

Question 32

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?

Accepted Answer

D. 55.0cm

Answer

A. 10.0cm

Answer

B. 30.0cm

Answer

C. 45.0cm

Answer

E. 250.0cm

Question 33

The invisible part of the spectrum of white light consists of

Accepted Answer

A. Infra-red and ultra-violet only

Answer

B. Infra-red, ultra-violet and blue only

Answer

C. red, orange and green only

Answer

D. red and violet only

Answer

E. yellow and indigo only

Question 34

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

Accepted Answer

E. reverse the direction of the current in the armature.

Answer

A. enable the armature to rotate freely

Answer

B. increase the flux linking the armature windings

Answer

C. maintain a direct current in the armature

Answer

D. provide uniform magnetic field around the armature

Question 35

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?

Accepted Answer

C. 30.0mm

Answer

A. 6.0mm

Answer

B. 18.0mm

Answer

D. 60.0mm

Answer

E. 120.0mm

Question 36

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?

Accepted Answer

B. 10.00cm

Answer

A. 5.00cm

Answer

C. 15.00 cm

Answer

D. 18.00 cm

Answer

E. 20.00cm

Question 37

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?

Accepted Answer

C. 1.32N

Answer

A. 132N

Answer

B. 13.2N

Answer

D. 0.132N

Answer

E. 0.013N

Question 38

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

Accepted Answer

E. the specific heat capacity of brass is lower than of clay.

Answer

A. brass is less dense than clay

Answer

B. clay expands more slowly than brass

Answer

C. clay loses heat faster than brass

Answer

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

Question 39

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 4200J kg-1K-1

Accepted Answer

B. 1.50°C

Answer

A. 0.015°C

Answer

C. 15.00°C

Answer

D. 21.00 °C

Answer

E. 50.00°C

Question 40

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

Accepted Answer

C. the accumulator can give a bigger current and can be recharged

Answer

A. a dry battery cannot supply the necessary high voltage

Answer

B. a dry battery would not operate on a cold frosty morning

Answer

D. the accumulator can supply a.c

Answer

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

Question 41

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

Accepted Answer

D. photoelectric effect

Answer

A. electron effect

Answer

B. metal electron effect

Answer

C. metal emission

Answer

E. photoemission

Question 42

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

Accepted Answer

B. film

Answer

A. diaphragm

Answer

C. focusing ring

Answer

D. lens

Answer

E. shutter

Question 43

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?

Accepted Answer

D. v = u + 2as

Answer

A. s = ut+$\frac{1}{2}$at2

Answer

B. v2 = u2 + 2as

Answer

C. v =u + at

Answer

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

Question 44

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

Accepted Answer

A. 6.0cm

Answer

B. 12.0cm

Answer

C. 18.0cm

Answer

D. 24.0cm

Answer

E. 48.0cm

Question 45

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

Accepted Answer

A. carbon microphone

Answer

B. electric bells

Answer

C. magnetic relay

Answer

D. telephone earpiece

Answer

E. thermostat

Question 46

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)

Accepted Answer

E. 3780 J

Answer

A. 420 J

Answer

B. 1680 J

Answer

C. 1701 J

Answer

D. 2100 J

2001 NECO Physics Past Questions

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