2009 NECO Physics Past Questions & Answers

Question 1

The phenomenon of photoelectric effect is used in the following EXCEPT

Accepted Answer

C. electric fire alarm

Answer

A. automatic doors

Answer

B. bugler alarm

Answer

D. sound production from film tracks

Answer

E. television cameras

Question 2

Calculate the heat energy lost when 10g of boiling water changes to ice at 0°C. [Specific latent heat of ice 336Jg-1 . Specific heat capacity of water 4.2Jg-1 K-1]

Accepted Answer

E. 7560J

Answer

A. 840J

Answer

B. 3360J

Answer

C. 3420J

Answer

D. 4200J

Question 3

A ball of mass 100g falls from a height of 5m onto a concrete floor and rebounds to a height of 3m. Calculate the energy lost. (g = 10$ms^{-2}$)

Accepted Answer

A. 2J

Answer

B. 20J

Answer

C. 100J

Answer

D. 1000J

Answer

E. 2000J

Question 4

The gravitational field intensity at a location X, in space, is two-fifths of its value on the earth’s surface. If the weight of an object at X is 4.80N. what is its weight on the earth?

Accepted Answer

E. 12.00N

Answer

A. 1.92N

Answer

B. 2.88N

Answer

C. 6.72N

Answer

D. 8.00N

Question 5

The space between the two walls of a vacuum flask is completely evacuated to reduce heat loss by

Accepted Answer

D. evaporation

Answer

A. condensation

Answer

B. conduction

Answer

C. convection

Answer

E. radiation

Question 6

A series RLC circuit is said to resonate, when

Accepted Answer

D. impedance is minimum

Answer

A. capacitive reactance is zero

Answer

B. conductance is maximum

Answer

C. current is minimum

Answer

E. inductive reactance is zero

Question 7

In which of the following fields is repulsion NOT experienced?

Accepted Answer

B. Gravitational only

Answer

A. Electrical only

Answer

C. Magnetic only

Answer

D. Magnetic and electrical

Answer

E. Magnetic and gravitational

Question 8

Calculate the work done in charging a capacitor of capacitance 20µF through a potential difference of 1000V.

Accepted Answer

E. 10.00 J

Answer

A. 0.02 J

Answer

B. 0.10 J

Answer

C. 0.20 J

Answer

D. 1.00 J

Question 9

Two forces A and B act at a point. If their resultant is [given by] (B - A) in the direction of B, then

Accepted Answer

E. the angle between A and B is 180°

Answer

A. A and B are equal

Answer

B. A is greater than B

Answer

C. the angle between A and B is 0°

Answer

D. the angle between A and B is 90°

Question 10

The electric potential at a distance d from a point charge q in air of permittivity eo is expressed as?

Accepted Answer

D. q ÷ 4πeod

Answer

A. q2 ÷ 4πeod

Answer

B. q2 ÷ 4πeo

Answer

C. q ÷ 4πeod2

Answer

E. q ÷ 4πeo2d

Question 11

Which of the following statements about water is NOT correct?

Accepted Answer

B. The volume of a given mass of water at 0° is less than its volume at 4°C

Answer

A. Pure water freezes at 0°C under normal pressure

Answer

C. Water boils at a definite temperature

Answer

D. Water evaporates at all temperatures

Answer

E. Water has its maximum density at 4°C

Question 12

Which of the following substances undergoes sublimation?

Accepted Answer

C. Iodine

Answer

A. Ether

Answer

B. Ice

Answer

D. Naphthalene

Answer

E. Turpentine

Question 13

Which of the following statements is correct about volatile liquids? They have

Accepted Answer

A. low boiling point

Answer

B. Low evaporating rate

Answer

C. high conductivity

Answer

D. high density

Answer

E. high viscosity

Question 14

An object of mass 2kg moves for 5s with a uniform velocity of 10ms. What is the magnitude of its acceleration in $ms^{-2}$ ?

Accepted Answer

A. zero

Answer

B. 2.5

Answer

C. 10

Answer

D. 12.5

Answer

E. 100

Question 15

Electric charges on the surface of a conductor would be most evenly distributed if the shape of the conductor is

Accepted Answer

E. spherical

Answer

A. conical

Answer

B. cubical

Answer

C. cylindrical

Answer

D. parabolic

Question 16

The work done in extending a spring by 40 mm is 1.52J. Calculate the elastic constant of the spring.

Accepted Answer

D. 1900.0 $Nm^{-1}$

Answer

A. 38.8 $Nm^{-1}$

Answer

B. 60.8 $Nm^{-1}$

Answer

C. 190.0 $Nm^{-1}$

Answer

E. 3800.0 $Nm^{-1}$

Question 17

An observer heard the sound of thunder 5.8s after the lightning flash was seen. How far was he from the source? [Speed of sound in air = 330$ms^{-1}$]

Accepted Answer

B. 1914m

Answer

A. 957m

Answer

C. 3828m

Answer

D. 8700m

Answer

E. 17400m

Question 18

In the electrical method of making a magnet, the polar the magnet formed depends on the

Accepted Answer

B. direction of the current

Answer

A. amount of current passed

Answer

C. nature of the material used

Answer

D. orientation of the magnetic material in space

Answer

E. size of the magnetic material

Question 19

A stone is thrown with a speed of 10ms at an angle of 30° to the horizontal, Calculate its time of flight, (g = 10ms2)

Accepted Answer

B. 1.0s

Answer

A. 0.5s

Answer

C. 1.7s

Answer

D. 2.0s

Answer

E. 3.4s

Question 20

A sound wave from a ship is received 8.4s later. What is the depth of the sea? [Speed of sound in water 1500$ms^{-1}$]

Accepted Answer

D. 6.300km

Answer

A. 0.179km

Answer

B. 0.357km

Answer

C. 3.150km

Answer

E. 12.600km

Question 21

Arrange the following in the order of their increasing frequency. I. Visible light II. Gamma rays III. Radio waves IV. Infra-red radiation V. Ultra-violet radiation

Accepted Answer

E. III, IV, I,V, II

Answer

A. I, II, III, IV, V

Answer

B. II, III, IV, V, I

Answer

C. III, IV, V, I, II

Answer

D. IV, III, I. V, II

Question 22

Determine the value of x from the nuclear reaction below, $^{222}_{86}Rn$ → $^{x}_{88}Ra$ + 2β + energy

Accepted Answer

B. 222

Answer

A. 220

Answer

C. 224

Answer

D. 226

Answer

E. 228

Question 23

Two forces of magnitude 8N and 4N act at right angle to each other. The angle between the resultant and the 8N force is

Accepted Answer

B. 26.6°

Answer

A. 23.9°

Answer

C. 29.5°

Answer

D. 60.0°

Answer

E. 63.4°

Question 24

Which of the following statements about a gas is NOT correct?

Accepted Answer

C. Its molecules are closely packed

Answer

A. It has no definite shape

Answer

B. It is compressible

Answer

D. Its molecules gain kinetic energy when heated

Answer

E. Its molecules move about randomly

Question 25

Which of the following pairs of phenomena helps in the resolution of the wave-particle paradox of matter?

Accepted Answer

B. Electron diffraction and refraction

Answer

A. Compton effect and thermionic emission

Answer

C. emission and absorption of light

Answer

D. Interference and polarization

Answer

E. Reflection and photoelectric effect

Question 26

An immersion heater is rated 1500W. How long does it take the heater to raise the temperature of 1 kg of water by 30°C? (Assume heat lost to the surrounding is negligible, Specific heat capacity of water 4200Jkg-1K-1)

Accepted Answer

A. 84s

Answer

B. 112s

Answer

C. 130s

Answer

D. 168s

Answer

E. 280s

Question 27

An effort P applied at one end of a crowbar just overcomes the resistance W at the lid of a tin. The mechanical advantage of the crowbar is expressed as

Accepted Answer

C. $\frac{w}{p}$

Answer

A. W + P

Answer

B. P - W

Answer

D. $\frac{p}{w}$

Answer

E. wp

Question 28

The defect of the eye lens which occurs as a result of weak ciliary muscles is called

Accepted Answer

D. presbyopia

Answer

A. astigmatism

Answer

B. hypermetropia

Answer

C. myopia

Answer

E. spherical aberration

Question 29

A ball of mass 0.1kg moving with a velocity of 20$ms^{-1}$ is hit by a force which acts on it for 0.02s. If the ball moves off in the opposite direction with a velocity of 25$ms^{-1}$ , calculate the magnitude of the force.

Accepted Answer

C. 225N

Answer

A. 25N

Answer

B. 125N

Answer

D. 100N

Question 30

A body executing simple harmonic motion has an angular speed of 2π radians. Its period of oscillation is (π 3.14).

Accepted Answer

B. 1.00s

Answer

A. 0.05s

Answer

C. 2.00s

Answer

D. 3.14s

Answer

E. 6.28s

Question 31

When a resistor of resistance R is connected across a.c. the terminal p.d. of the cell is reduced to three-quarter its e.m.f. The cell’s internal resistance in terms of R is

Accepted Answer

B. $\frac{R}{3}$

Answer

A. $\frac{R}{4}$

Answer

C. $\frac{R}{2}$

Answer

D. 2$\frac{R}{3}$

Answer

E. R

Question 32

A plane progressive wave is represented by the equation y = 0.2sin (200πt - 0.5.x) where x and y are measured in cm and t in s. What is the frequency of the wave?

Accepted Answer

D. 100.0Hz

Answer

A. 0.5Hz

Answer

B. 4.0Hz

Answer

C. 10.0Hz

Answer

E. 200.0Hz

Question 33

Which of the following statements about the pressure in a liquid is NOT correct? It

Accepted Answer

B. changes with the material of the container

Answer

A. acts in all direction

Answer

C. is the same at all points in the same horizontal plane

Answer

D. varies with the density of the liquid

Answer

E. varies with the depth of the liquid

Question 34

A transformer has an efficiency of 92.5%. the ratio number of turns in the primary coil to that in the secondary coil is 128 : 45. If the current passing through the secondary coil is 9.0A, calculate the current passing through the primary-coil.

Accepted Answer

C. 3.42A

Answer

A. 2.93A

Answer

B. 3.16A

Answer

D. 25.60A

Answer

E. 27.68A

Question 35

Which of the following pairs of musical instruments produce sound due to the vibration of air column?

Accepted Answer

D. Trumpet and flute

Answer

A. Bell and piano

Answer

B. Guitar and flute

Answer

C. Trumpet and drum

Answer

E. Violin and organ

Question 36

The equation PxVyTz = Constant is Charles’ law if

Accepted Answer

A. x = 0, y = 1 and z = -1

Answer

B. x = 0, y = -1 and z = 1

Answer

C. x = 1, y = 1 and z = 0

Answer

D. x = 1, y = 1 and z = -1

Answer

E. x = 1, y = 1 and z = 1

Question 37

Which of the following types of motion is/are exhibited by a cylindrical drum rolling down an incline plane?

Accepted Answer

E. Translational and rotational

Answer

A. Random and rotational

Answer

B. Rotational and oscillatory

Answer

C. Rotational only

Answer

D. Translations only

Question 38

A projectile attains its maximum height when the angle of projection is?

Accepted Answer

E. 90°

Answer

A. 30°

Answer

B. 45°

Answer

C. 60°

Answer

D. 75°

Question 39

Which of the following cells does not require a dipolar for effective and efficient delivery of current?

Accepted Answer

C. Nickel-iron accumulator

Answer

A. Daniel cell

Answer

B. Dry Leclanche cell

Answer

D. Voltaic cell

Answer

E. Wet Leclanche cell

Question 40

Which of the following phenomena is responsible for the spherical shape of soap bubbles?

Accepted Answer

E. Surface tension

Answer

A. Adhesion

Answer

B. Capillarity

Answer

C. Cohesion

Answer

D. Osmosis

Question 41

Which of the following statements is correct about light and sound waves? Both

Accepted Answer

E. transmit energy

Answer

A. are longitudinal waves

Answer

B. are transverse waves

Answer

C. have the same velocity in air

Answer

D. need a medium for propagation

Question 42

A body accelerating will have a constant speed if it is

Accepted Answer

C. moving in a circular path

Answer

A. falling from a height

Answer

B. in equilibrium

Answer

D. moving in a straight line

Answer

E. oscillating

Question 43

Inertia is the property of a body which makes the body to

Accepted Answer

B. be reluctant to move when at rest

Answer

A. accelerate

Answer

C. experience friction when moving

Answer

D. move randomly

Answer

E. retard

Question 44

The term torque means

Accepted Answer

B. the moment of a force about an ads

Answer

A. the equilibrant of two concurrent forces

Answer

C. the resultant of several forces acting on a body in equilibrium

Answer

D. two coplanar forces at right angle to each other

Answer

E. two equal and opposite forces whose lines of action do not coincide

Question 45

Two images Y and X are formed by a plane mirror and a convex mirror respectively. Which of the following is correct about their characteristics?

Accepted Answer

C. The magnification of Y is one while that of X is less than one

Answer

A. Both are inverted

Answer

B. The magnification of Y is greater than one while that of X is one

Answer

D. Y is inverted while X is erect

Answer

E. Y is real while X is virtual.

2009 NECO Physics Past Questions

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