2003 NECO Physics Past Questions & Answers

Question 1

Which of the following properties is NOT exhibited by sound waves?

Accepted Answer

C. Polarisation

Answer

A. Diffraction

Answer

B. interference

Answer

D. Reflection

Answer

E. Refraction

Question 2

The inability of the eye to focus near objects is known as

Accepted Answer

C. hypermatropia

Answer

A. astigmatism

Answer

B. eye ring

Answer

D. myopia

Answer

E. presbyopia

Question 3

The area under the curve of a velocity time graph represents

Accepted Answer

B. distance covered

Answer

A. acceleration

Answer

C. instantaneous speed

Answer

D. time taken

Answer

E. work done

Question 4

The distance between two successive crests of a water wave is 0.5m. If a particle on the surface of the water wave makes two complete vertical oscillations in 1s, calculate the speed of the wave.

Accepted Answer

C. 1.00$ms^{-1}$

Answer

A. 0.25$ms^{-1}$

Answer

B. 0.50$ms^{-1}$

Answer

D. 2.00$ms^{-1}$

Answer

E. 4.00$ms^{-1}$

Question 5

The motion of the prongs of a sounding turning fork is

Accepted Answer

B. oscillatory

Answer

A. circular

Answer

C. random

Answer

D. rotational

Answer

E. translational

Question 6

A wire of length 100cm and cross-sectional area 2.0 × 10-3cm2 has a resistance of 0.10 ω. Calculate its electrical conductivity.

Accepted Answer

B. 5.0 × 105 ω-1$cm^{-1}$

Answer

A. 2.0 × 10-6 ω-1$cm^{-1}$

Answer

C. 2.0 × 106 ω-1$cm^{-1}$

Answer

D. 5.0 × 10-6 ω-1$cm^{-1}$

Answer

E. 5.0 × 107 ω-1$cm^{-1}$

Question 7

The mode of transference of heat which does not require any material medium is

Accepted Answer

D. radiation

Answer

A. conduction

Answer

B. convection

Answer

C. evaporation

Answer

E. transmission

Question 8

Which of the following statement(s) is/are correct about the isotopes of an elements? They have the same I. chemical properties II. nucleon number III proton number

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

Show answer

Answer: D. I and III only

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Accepted Answer

D. I and II only

Answer

A. I only

Answer

B. II only

Answer

C. III only

Answer

E. II and III only

Question 9

The resistance of a series R-C circuit is 5 ω If the impedance of the circuit is 13 ω calculate the reactance of the capacitor

Accepted Answer

A. 12 Ω

Answer

B. 14 Ω

Answer

C. 16 Ω

Answer

D. 18 Ω

Answer

E. 65 Ω

Question 10

Water in an open container boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of a mountain

Accepted Answer

B. pressure is reduced

Answer

A. pressure is increased

Answer

C. the rays of the sun add more heat to the water

Answer

D. the saturation vapour pressure of water is higher than at sea-level

Answer

E. the temperature is lower than at sea-level

Question 11

Which of the following statements is NOT true?

Accepted Answer

A. A lead-acid accumulator can deliver a large current because of its very large internal resistance.

Answer

B. A secondary cell can be recharged.

Answer

C. As a lead-acid accumulator is being charged, the density of the acid in it increases.

Answer

D. The chemical action in a primary cell is irreversible.

Answer

E. The conventional current in a circuit rlows from the positive to the negative terminal of the battery.

Question 12

A constant force of 5N acts for 5s on a mass of 5kg initially at rest. Calculate the final momentum of the mass.

Accepted Answer

C. 25 kg$ms^{-1}$

Answer

A. 125 kg$ms^{-1}$

Answer

B. 75 kg$ms^{-1}$

Answer

D. 20 kg$ms^{-1}$

Answer

E. 5 kg$ms^{-1}$

Question 13

A narrow, uniform glass tube, closed at one end, constains air which is sealed by a thread of mercury. The tube is placed first horizontally and then vertically with the open end at the top. Which of the following statements is correct?

Accepted Answer

B. The length of the entrapped air in the vertical position is less than that in the horizontal position

Answer

A. The length of the entrapped air in the horizontal position is less than that in the vertical position

Answer

C. The length of the mercury column becomes shorter in the horizontal position than in the vertical position

Answer

D. The length of the mercury column becomes shorter in the vertical position than in the horizontal position

Answer

E. The pressure of the entrapped air is atmospheric in both cases.

Question 14

Evaporation of a liquid produces cooling of the liquid because the

Accepted Answer

B. average kinetic energy of the liquid is reduced

Answer

A. attraction between the vapour molecules and the liquid molecules is great

Answer

C. density of the liquid decreases

Answer

D. vapour pressure above the liquid rises

Answer

E. volume of the liquid decreases

Question 15

The S.l unit of magnetic flux density is

Accepted Answer

D. tesla

Answer

A. farad

Answer

B. henry

Answer

C. kgm-3

Answer

E. weber

Question 16

A stone is released from a height of 80m above the ground. Calculate its velocity just before it strikes the ground. (g = 10ms$^{-2}$)

Accepted Answer

B. 40 $ms^{-1}$

Answer

A. 25$ms^{-1}$

Answer

C. 55 $ms^{-1}$

Answer

D. 65$ms^{-1}$

Answer

E. 80 $ms^{-1}$

Question 17

A platinum-resistance thermometer has a resistance of 4Ω at 0°C and 12Ω at 100°C. Assuming that the resistance changes uniformly with temperature. Calculate the resistance of the thermometer when the temperature is 45°C.

Accepted Answer

C. 7.6Ω

Answer

A. 6.0Ω

Answer

B. 6.42Ω

Answer

D. 8.4Ω

Answer

E. 16.0Ω

Question 18

An evidence of the wave nature of matter is

Accepted Answer

C. diffraction

Answer

A. Browniam motion

Answer

B. Compton effect

Answer

D. diffusion

Answer

E. photo electricity

Question 19

The space surrounding a magnet in which the magnetic force is exerted is

Accepted Answer

A. magnetic field

Answer

B. magnetic flux

Answer

C. magnetic point

Answer

D. magnetic pole

Answer

E. magnetic strength

Question 20

For which of the following sets are the units fundamental?

Accepted Answer

C. Length, time and mass

Answer

A. Area, length and volume

Answer

B. Impulse, mass and time

Answer

D. Velocity, distance and time

Answer

E. Volume, mass and density

Question 21

A sheet of white paper viewed through blue glass appears blue because

Accepted Answer

B. the glass absorbs all colours except the blue colour

Answer

A. blue is a primary colour

Answer

C. the glass reflects blue colour

Answer

D. the paper reflects blue colour only

Answer

E. white light is easily absorbed by the glass

Question 22

Which of the following motions will be produced by a pair of equal, opposite and non-collinear parallel forces acting on a body?

Accepted Answer

C. Rotational

Answer

A. Oscillatory

Answer

B. Random

Answer

D. Translational

Answer

E. Vibratory

Question 23

In 90 seconds, the mass of a radioactive element reduces to $\frac{1}{16}$ of its original value. Determine the half- life of the element.

Accepted Answer

C. 22.5s

Answer

A. 15.0s

Answer

B. 18.0s

Answer

D. 30.0s

Answer

E. 45.0s

Question 24

A ball of mass m moving at velocity u collides with another ball of equal mass at rest. If the two balls move off together after the impact, calculate their common velocity.

Accepted Answer

B. $\frac{u}{2}$

Answer

A. $\frac{u}{v}$

Answer

C. u

Answer

D. 2u

Answer

E. $\frac{u}{m}$

Question 25

The volume of a given mass of gas is 40cm3 at 27° C. What is its volume at 90° C if its pressure remains constant?

Accepted Answer

C. 48.40cm3

Answer

A. 32.84cm3

Answer

B. 40.02cm3

Answer

D. 57.44cm3

Answer

E. 72.84cm3

Question 26

Lines of force I. Begin and end on equal and opposite electric charges. II. are in state of tension which causes them to shorten III. attract one another. Which of the statement(s) is/are correct?

Accepted Answer

D. I and II only

Answer

A. I only

Answer

B. II only

Answer

C. III only

Answer

E. II and III only

Question 27

$^{226}_{88}Ra$ $	o$ $^{222}_{86}Rn$ + X + Energy. The equation above represents a nuclear decay of radium isotope. What is X?

Accepted Answer

A. Alpha particle

Answer

B. Beta particle

Answer

C. Gamma ray

Answer

D. Neutron

Answer

E. X – ray

Question 28

Calculate the amount of heat generated in an external load of resistance 8Ω if an alternating current of peak value 5 A is passed through it for 100s.

Accepted Answer

B. 1.0 × 104J

Answer

A. 2.0 × 104J

Answer

C. 5.0 × 103J

Answer

D. 4.0 × 103J

Answer

E. 2.0 × 102J

Question 29

Lenz’s law of electromagnetic induction states that

Accepted Answer

B. the induced current in a conductor is in such a direction as to oppose the change producing it

Answer

A. a force is exerted on a current carrying conductor in a magnetic field

Answer

C. the magnitude of the induced electromotive force in a circuit is proportional to the rate of change of the number of lines of force linking the circuit

Answer

D. the magnitude of the induced electromotive force is proportional to the current producing the magnetic flux

Answer

E. whenever there is a change in the magnetic flux linked with the circuit, an electromotive is induced

Question 30

An object is placed 30 cm in front of a concave mirror of focal length 20cm. Calculate the distance between the object and the image.

Accepted Answer

C. 30cm

Answer

A. 90cm

Answer

B. 40cm

Answer

D. 20cm

Answer

E. 10cm

Question 31

A machine has an efficiency of 80%. If the machine is required to overcome a load of 60N with a force of 40N, calculate its velocity ratio.

Accepted Answer

E. 1.88

Answer

A. 0.53

Answer

B. 0.83

Answer

C. 1.20

Answer

D. 1.50

Question 32

Which of the following scientists postulated that moving particles exhibit wave properties?

Accepted Answer

D. Louis de Broglie

Answer

A. Ernest Rutherford

Answer

B. Erwin Schroedinger

Answer

C. Frank Hertz

Answer

E. Werner Heisenberg.

Question 33

Two equal capacitances are connected first in series and then in parallel. The ratio of the effective series capacitance to the effective parallel capacitance is

Accepted Answer

A. 0.25

Answer

B. 0.50

Answer

C. 1.00

Answer

D. 2.20

Answer

E. 4.00

Question 34

How much heat is required to convert 50g of water at 100°C to steam at the same temperature? (Specific latent heat of vaporization of water = 2260 Jg-11)

Accepted Answer

D. 1.13 × 105J

Answer

A. 1.13 × 10-4J

Answer

B. 1.31 × 102J

Answer

C. 1.30 × 104J

Answer

E. 1.31 × 106J

Question 35

Young’s modulus of elasticity is the ratio of stress to strain, provided the load does not exceed the

Accepted Answer

B. elastic limit

Answer

A. breaking point

Answer

C. plastic limit

Answer

D. stress limit

Answer

E. yield point

Question 36

Which of the following statements about the concept of solid friction is NOT true?

Accepted Answer

A. It always acts in the direction of motion

Answer

B. It causes wear and tear in car tyres

Answer

C. It depends on the nature of the surfaces in contact

Answer

D. It is independent of the area of the surfaces in contact.

Answer

E. It reduces the efficiency of the machine

Question 37

Which of the following radiations have the longest wavelength?

Accepted Answer

D. Radio waves

Answer

A. Gamma rays

Answer

B. Infra-red

Answer

C. Light waves

Answer

E. Ultra-violet rays

Question 38

Which of the following instruments can be used to measure e.m.f. most accurately.

Accepted Answer

D. Potentiometer

Answer

A. Ammeter

Answer

B. Galvanometer

Answer

C. Metre bridge

Answer

E. Voltmeter

Question 39

J.J. Thomson’s model of the atom was abandoned because

Accepted Answer

A. it could not explain the scattering of alpha particles

Answer

B. it did not account for the neutron

Answer

C. it did not account for the size of the atom

Answer

D. it was known as plum-pudding model

Answer

E. the model was not similar to any observable phenomena

Question 40

A body that produces its own light is said to be

Accepted Answer

A. luminous

Answer

B. non-incandescent

Answer

C. opaque

Answer

D. translucent

Answer

E. transparent

Question 41

A body is launched from the earth’s surface, of radius R, so that it just escapes from the gravitational influence of the earth; If the gravitational constant is G and the mass of the earth is M, what is the escape velocity of the boby.

Accepted Answer

B. $\frac{\sqrt{2GM}}{R}$

Answer

A. $\sqrt{2GM}$ ÷ R

Answer

C. $\frac{\sqrt{2G}}{MR}$

Answer

D. $\sqrt{2GMR}$

Answer

E. $\frac{\sqrt{R}}{2GM}$

Question 42

Which of the following statement(s) is/are correct about the isotopes of an elements? They have the same I. chemical properties II. nucleon number III proton number

Accepted Answer

D. I and III only

Answer

A. I only

Answer

B. II only

Answer

C. I and II only

Answer

E. I,II and III

Question 43

A short chain is usually attached to the rear side of petro tanker trailing behind it to ensure that the

Accepted Answer

A. charges generated by friction in the tanker are conducted to the earth

Answer

B. chain vibrates in resonance with the tanker’s engine

Answer

C. heat generated by friction in the engine is conducted to the earth

Answer

D. petrol tanker is balanced on the road

Answer

E. tanker does not exceed a certain speed limit

Question 44

A transformer is required to give 120V from a 240V mains supply. If the primary has 5500 turns, how many turns has the secondary?

Accepted Answer

D. 2750

Answer

A. 232

Answer

B. 450

Answer

C. 550

Answer

E. 11000

Question 45

Calculate the critical angle for light traveling from water to air. (Refractive index of water = 1.33)

Accepted Answer

C. 48.8°

Answer

A. 36.9°

Answer

B. 41.3°

Answer

D. 49.2°

Answer

E. 51.4°

2003 NECO Physics Past Questions

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