NECO SSCE - Physics - 2000 (Objective)

Question 1 Report

The length of a side of a metallic cube at 20° C is 5.0cm. Given that the linear expansively of the metal is 4.0 × 10^-5K^-1, find the volume of the cube at 120° C

124.50cm³

125.00cm³

126.00cm³

126.25cm³

126.50cm³ Correct answer

Answer Details

Read lesson note on Temperature And Its Measurement (JAMB)

Temperature And Its Measurement

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Question 2 Report

Two forces forming a couple are separated by a distance of 25cm. If one of the forces equals 40N, what is the moment of the couple?

1000 Nm

500 Nm

10 Nm Correct answer

5 Nm

1.6 Nm

Answer Details

Read lesson note on Equilibrium Of Forces (JAMB)

Read lesson note on Equilibrium Of Forces (WAEC)

Equilibrium Of Forces

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Question 3 Report

I. A scalar quantity has only magnitude
II. A scalar quantity has both magnitude and direction
III. A vector quantity has both magnitude and direction
IV. A vector quantity has only magnitude.

Which of the above statement is/are correct?

I only

l and II only

l and III only Correct answer

II and III only

III only

Answer Details

Read lesson note on Scalars And Vectors (JAMB)

Read lesson note on Measurements And Units (JAMB)

Scalars And Vectors

Measurements And Units

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Question 4 Report

A piece of stone weights 180 N in air and 150 N in a beaker containing 160 N of methylated spirit. What is the up thrust exerted on the stone?

50N

40N

30N Correct answer

20N

10N

Answer Details

Read lesson note on Gravitational Field (JAMB)

Read lesson note on Pressure (JAMB)

Gravitational Field

Pressure

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Question 5 Report

A solid weights 5.0 N in air, 4.2 N in water and 4.4 N in liquid Y. Calculate the relative density of liquid Y.

0.75 Correct answer

0.88

0.95

1.13

1.33

Answer Details

Read lesson note on Measurements And Units (JAMB)

Measurements And Units

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Question 6 Report

If the first position of resonance in a resonance tube is 18.0cm from the open end, the distance from the open end to the next position of resonance will be

24.0cm

27.0cm

36.0cm

45.0cm

54.0cm Correct answer

Answer Details

Read lesson note on Motion (JAMB)

Read lesson note on Gravitational Field (WAEC)

Motion

Gravitational Field

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Question 7 Report

To keep a lorry moving at a constant speed v, requires power p, from the engine. The force provided by the engine is

\(\frac{1}{2}\)v

\(\frac{p}{v}\) Correct answer

pv²

\(\frac{p}{v^2}\)

Answer Details

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

Work, Energy And Power

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Question 8 Report

A radioactive substance has a half-life of 3 minutes. After 9 minutes, the count rate was observed to be 200. What was the count rate at zero time?

200

1200

1600 Correct answer

2400

4800

Answer Details

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Question 9 Report

Two 2.0Ω resistors can be combined circuit to give an overall resistance of

0.5Ω only

1.0 Ω only

either 0,5Ω or 1.0 Ω

either 1.0Ω or 4.0 Ω Correct answer

either 0.5Ω, 1.0Ω or 4.0Ω

Answer Details

Read lesson note on Equilibrium Of Forces (WAEC)

Equilibrium Of Forces

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Question 10 Report

When electrical power is transmitted over long distances, the voltage is stepped up so that

the resistance of the wire may be increased proportionately to the potential difference

the time of transmissions between the generating and the receiving stations may be reduced

there is increased current to produce brighter lights.

the rate of electrical consumption is increased.

the energy waste may be minimised as the current is lowered. Correct answer

Answer Details

Read lesson note on Current Electricity (JAMB)

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

Current Electricity

Simple A.C Circuits

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Question 11 Report

If a positively charged glass-rod is used to charge an electroscope X by contact and an electroscope Y by induction, then

X and Y will be negatively charge

X and Y will be positively charged

X will be negatively charged and Y positively charged

X will be positively charged and Y negatively charged Correct answer

X will be positively charged and Y will remain uncharged

Answer Details

Read lesson note on Electrostatics (JAMB)

Electrostatics

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Question 12 Report

The force exerted on a charged body in an electric field depends on

I. the charge on the body
II. the electric field intensity
III. the square of the mass of the body

I only

II only

I and II only Correct answer

I and III only

II and III only

Answer Details

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Question 13 Report

A wave travels a distance of 20 cm in 3s. The distance between successive crests of the wave is 4cm. What is the frequency of the wave?

0.60Hz

1.67Hz Correct answer

7.50Hz

15.00Hz

26.67Hz

Answer Details

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

Production And Propagation Of Waves

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Question 14 Report

The specific heat of a substance in the solid state is C₁; its specific beat in the liquid state is C₂ and its latent heat of fusion is L. If a mass M of the substance is changed from the solid state at temperature T, to the liquid state, also at temperature T, the amount of heat required will be

M(C₁ ÷ C₂) x T

ML Correct answer

M(C₁ + C₂) × T ÷ ML

ML(C₁ + C₂ ÷ 2) × T

Answer Details

Read lesson note on Heat Energy (WAEC)

Heat Energy

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Question 15 Report

Which of the following is NOT part of an a.c generator?

Commutator Correct answer

Armature

Field magnet

Carbon brushes

Slip rings

Answer Details

Read lesson note on Capacitors (JAMB)

Capacitors

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Question 16 Report

The image is a plane mirror is

inverted, real with a magnificant of \(\frac{1}{2}\)

inverted, virtual with a magnification of 1

inverted, real with a magnification of 2

upright, virtual with a magnificent of 1 Correct answer

upright, real with a magnification of 2

Answer Details

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

Read lesson note on Electrostatics (JAMB)

Properties Of Waves: Reflection, Refraction, Diffraction

Electrostatics

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Question 17 Report

Which of the following is/are TRUE of nuclear fission?

I. A heavy nucleus is split into two nuclei of comparable masses
II. Two light nuclei are joined together to form a heavier nucleus
III. The total mass of the products is less than that of the reactants

I only

II only

III only

I and III only Correct answer

II and III only

Answer Details

Read lesson note on Wave-particle Paradox (WAEC)

Read lesson note on Structure Of The Nucleus (WAEC)

Wave-particle Paradox

Structure Of The Nucleus

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Question 18 Report

A particle of charge q and mass m moving with a velocity v enters a uniform magnetic field B in the direction of the field. The force on the particle is

Bqv Correct answer

Bq\(\frac{v}{m}\)

Bqvm

mv\(\frac{B}{q}\)

\(\frac{mv}{Bq}\)

Answer Details

Read lesson note on Electric Field (WAEC)

Read lesson note on Gravitational Field (JAMB)

Electric Field

Gravitational Field

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Question 19 Report

Which of the following pairs of light rays shows the widest separation in the spectrum of white light?

Red and blue

Orange and green

Red and indigo Correct answer

Violet and green

Yellow and red

Answer Details

Read lesson note on Light Energy (JAMB)

Read lesson note on Light Waves (WAEC)

Light Energy

Light Waves

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Question 20 Report

400g of cold water is added to 200g of water at 70°C. If they are properly mixed and the temperature of the mixture is 300°C. calculate the initial temperature of the cold water. (Neglect the heat absorbed by the container)

10°C Correct answer

15°C

20°C

30°C

40°C

Answer Details

Read lesson note on Quantity Of Heat (JAMB)

Read lesson note on Temperature And Its Measurement (JAMB)

Quantity Of Heat

Temperature And Its Measurement

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Question 21 Report

An electric bell operated within an evacuated bell jar enables us to infer correctly that

light waves require a medium for transmission

sound waves do not require a medium for transmission

light waves do not require a medium for transmission but sound waves do Correct answer

light waves travel much faster than sound waves

light waves and sound waves travel at the same speed

Answer Details

Read lesson note on Sound Waves (WAEC)

Read lesson note on Light Waves (WAEC)

Read lesson note on Gravitational Field (WAEC)

Sound Waves

Light Waves

Gravitational Field

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Question 22 Report

The unit of inductance is

Weber

Telsa

Hertz

Henry Correct answer

Farad

Answer Details

Read lesson note on Capacitors (JAMB)

Capacitors

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Question 23 Report

A man standing 510m away from a wall sounds a whistle. The echo from the wall reaches him 3s later. Calculate the velocity of sound in air.

170 ms-1

340 ms-1 Correct answer

680 ms-1

765 ms-1

1530 ms-1

Answer Details

Read lesson note on Motion (JAMB)

Motion

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Question 24 Report

A gas occupies a certain volume at 27°C. At what temperature will its volume be twice times the original volume assuming that its pressure remains constant?

54°C Correct answer

108°C

150°C

327°C

600°C

Answer Details

Read lesson note on Temperature And Its Measurement (JAMB)

Temperature And Its Measurement

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Question 25 Report

In a simple pendulum experiment, a boy observed that the times for 30 oscillations are 70.0s, 72.0s and 67.0s respectively. Calculate the mean period of oscillation of the pendulum.

0.14s

0.43s

2.32s Correct answer

2.40s

6.97s

Answer Details

Read lesson note on Equilibrium Of Forces (WAEC)

Equilibrium Of Forces

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Question 26 Report

Which of the following statements about evaporation and boiling is FALSE?

Evaporation may take place at any temperature.

In evaporation, vapour escapes only from the surface of a liquid

The temperature remains constant as long as the liquid is boiling

The temperature at which boiling takes place can be altered by changing the external pressure

The rate of evaporation does not depend on temperature. Correct answer

Answer Details

Read lesson note on Quantity Of Heat (JAMB)

Read lesson note on Change Of State (JAMB)

Quantity Of Heat

Change Of State

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Question 27 Report

An astronomical telescope which is being used to view a very distant object is said to be in normal adjustment if

the final image is at the near-point

the image formed by the objective is before the focus of the eye piece

the angular magnification is the ratio of the focal length of the eye-piece lens to that of the objective

the foci dl the objective and the eye-piece coincide between the lenses Correct answer

the distance between the objective lens and the eye-piece is equal to the difference between their focal lengths.

Answer Details

Read lesson note on Waves (JAMB)

Read lesson note on Scalars And Vectors (JAMB)

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

Read lesson note on Electrostatics (JAMB)

Waves

Scalars And Vectors

Simple A.C Circuits

Electrostatics

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Question 28 Report

The helium isotope \(^3_2He\)

has three pro tons and two neutrons

has two protons and one neutron

has two protons and three neutrons

has one proton and two neutrons

cannot exist because it has the same mass number as tritium Correct answer

Answer Details

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

Structure Of The Atom (Nigeria Only)

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Question 29 Report

The image obtained on the screen of a pin-hole camera becomes less sharply defined when the

object is moved farther from the pin-hole

screen is moved farther from the pin-hole

object is made smaller

illumination is made more intense

pin-hole is made larger. Correct answer

Answer Details

Read lesson note on Electrostatics (JAMB)

Electrostatics

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Question 30 Report

A man at the back of a crowd watches a parade by holding a plane mirror just above his head. The parade passes 6 metres behinde his head and the mirror is 0.25m in front of the man. How far does the image in the mirror appear to be from the man?

6.50m Correct answer

6.25m

6.00m

5.75m

5.50m

Answer Details

Read lesson note on Electrostatics (JAMB)

Electrostatics

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Question 31 Report

The half-life of a radioactive substance is 2 seconds. Calculate the decay constant.

2.890 s^-1

1 .445 s^-1

0.576 s^-1

0.347s^-1 Correct answer

0.152 s^-1

Answer Details

Read lesson note on Elementary Modern Physics (JAMB)

Elementary Modern Physics

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Question 32 Report

Which of the following is/areNOT affected by a magnetic field?

I. Alpha particle
II. Cathode rays
III. Neutrons

I only

II only

III only Correct answer

I and II only

I,II & III

Answer Details

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

Electromagnetic Field (Part 2)

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Question 33 Report

A block of a substance X will sink in a liquid V but float liquid Z. Which of the following statements is NOT correct about the densities of the three substances?

Density of liquid Z is greater than that of X

Density of liquid V is less than that of liquid X

Density of liquid Y is less than that of liquid Z

Liquid Z has the greatest density of all the three substances.

If liquids Y and Z do not mix, liquid Z will float on liquid Y. Correct answer

Answer Details

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Question 34 Report

A boy ran a distance of 200m in 24s. His average speed was 8.3ms^-1. Which of the following is correct about the units in which the statements above are expressed?

All the units are fundamental.

All the units are derived

All the units except one are S.I units

Two of the units are fundamental and one derived. Correct answer

None of the units is S.I units.

Answer Details

Read lesson note on Fundamental And Derived Quantities And Units (WAEC)

Fundamental And Derived Quantities And Units

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Question 35 Report

A boy moving with a velocity of 3 ms^-1 is brought to rest by a constant force after travelling 15m. Calculate the retardation.

0.15ms^-2

0.30ms^-2 Correct answer

0.60ms^-2

3.33ms^-2

6.66ms^-2

Answer Details

Read lesson note on Scalars And Vectors (JAMB)

Scalars And Vectors

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Question 36 Report

Which of the following is used in a nuclear reactor to slow down fast moving neutrons?

graphite rods Correct answer

carbon dioxide gas

liquid sodium metal

concrete shield

boron rods

Answer Details

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

Structure Of The Atom (Nigeria Only)

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Question 37 Report

When a metal is heated to a high temperature, electrons are emitted from its surface. The process is known as

photoelectric effect

thermionic emission Correct answer

field emission

secondary emission

radioactive emission

Answer Details

Read lesson note on Electrostatics (JAMB)

Electrostatics

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Question 38 Report

The smallest unit on the sleeve of a micrometer screw gauge is 0.5mm. There are fifty divisions on the thimble of the screw gauge.
What is the smallest length that can be measured with this instrument?

0.05cm

0.01cm

0.005cm

0.001cm Correct answer

0.0001cm

Answer Details

Read lesson note on Measurements And Units (JAMB)

Measurements And Units

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Question 39 Report

The image formed by a converging lens of focal length is of a distance of 2f from the lens. Calculate the lateral magnification produced

0.5

1 Correct answer

1.5

Answer Details

Read lesson note on Electrostatics (JAMB)

Electrostatics

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Question 40 Report

An element of nuclear number A and proton number Z emits an alpha particle from its nucleus. The nucleon number and the proton number of the new element formed are respectively

(A – 2) and (Z – 2)

(A + 4) and (Z + 2)

(A– 4) and (Z+2)

(A+ 4) and (Z – 2)

(A – 4) and (Z – 2) Correct answer

Answer Details

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

Structure Of The Atom (Nigeria Only)

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Question 41 Report

When a lever is in equilibrium, under the action of two or more forces, the algebraic sum of the moments of the forces about the point of support is

anti-clockwise

clockwise

equal to the product to the forces

numerically equal to the total forces acting

equal to zero Correct answer

Answer Details

Read lesson note on Equilibrium Of Forces (JAMB)

Read lesson note on Equilibrium Of Forces (WAEC)

Equilibrium Of Forces

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Question 42 Report

An electric iron rated 250 V has a coil of resistance 125Ω. What is the cost of using it for I hour at 10k per kWh?

1.25k

2.50k

5.00k Correct answer

10.00k

20.00k

Answer Details

Read lesson note on Current Electricity (JAMB)

Current Electricity

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Question 43 Report

The clinical thermometer differs from other mercury-in-glass thermometers because it has

I. a constriction
II. a wide range
III. a short range
IV. a narrow bore.

Which of the above are correct?

I and II only

I and III only Correct answer

III and IV only

I,II and III only

I, III and IV only

Answer Details

Read lesson note on Temperature And Its Measurement (JAMB)

Read lesson note on Measurements And Units (JAMB)

Temperature And Its Measurement

Measurements And Units

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Question 44 Report

The heat from a fire in a closed room reaches someone far away in the room, mainly by

reflection

diffusion

conduction

radiation Correct answer

convection

Answer Details

Read lesson note on Waves (JAMB)

Read lesson note on Heat Transfer (JAMB)

Waves

Heat Transfer

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Question 45 Report

Calculate the peak voltage of a mains supply of r.ms. value 220V.

121 V

156 V

225 V

240 V

311 V Correct answer

Answer Details

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Question 46 Report

What is the coefficient of static friction between a load of mass 2kg and a horizontal surface, if the limiting frictional force is 10N? (g = 10 ms^-2)

0.2

0.5 Correct answer

Answer Details

Read lesson note on Friction (JAMB)

Read lesson note on Rectilinear Acceleration (WAEC)

Friction

Rectilinear Acceleration

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