2005 NECO Physics Past Questions & Answers

Question 1

Which of the following is used for shielding radioactive fallout?

Accepted Answer

B. Lead

Answer

A. Aluminum

Answer

C. Iron

Answer

D. Plastic

Answer

E. Wood

Question 2

Which of the following is NOT a component of a slide projector?

Accepted Answer

C. Convex mirror

Answer

A. Concave mirror

Answer

B. Condenser

Answer

D. light source

Answer

E. Screen.

Question 3

The wave theory of light does not explain photoelectricity because

Accepted Answer

D. there is a threshold wavelength for electron emission

Answer

A. light waves carry little energy

Answer

B. particles cannot be emitted by waves

Answer

C. the frequency of light waves too high

Answer

E. the wavelength of Light waves is too short.

Question 4

An atom radiates 1.5 × 10-19J when an electron jumps from one level to another. What is the wavelength of the emitted radiation? (Planck’s constant 6.6 × l0-34Js ; Speed of light in vacuum = 3.0 × 108$ms^{-1}$)

Accepted Answer

A. 1.32 × 10-6m

Answer

B. 2.97 × 10-6m

Answer

C. 3.30 × 10-6m

Answer

D. 6.82 × 10-6m

Answer

E. 8.01 × 10m-6

Question 5

The amplitude of oscillation of a simple pendulum bob diminishes slowly because

Accepted Answer

B. frictional forces dissipate the energy of motion

Answer

A. energy is applied by some external agencies

Answer

C. the frequency of oscillation increases with the mass of the bob

Answer

D. the frequency of oscillation varies with time

Answer

E. the period of oscillation varies with time.

Question 6

The mercury column in a simple mercury barometer is of height 5m above the mercury in a reservoir. If the tube is replaced with one whose radius is twice that of the first tube, what will be the height of the mercury column in the new tube?

Accepted Answer

B. 5.0m

Answer

A. 2.5m

Answer

C. 7.5m

Answer

D. 10.0m

Answer

E. 20.0m

Question 7

The motion of the wheel of a bicycle moving on a smooth straight road is

Accepted Answer

E. rotational and translational

Answer

A. oscillatory and random

Answer

B. oscillatory and translational

Answer

C. rotational and oscillatory

Answer

D. rotational and random

Question 8

An electric motor primary converts

Accepted Answer

C. electrical energy to mechanical energy

Answer

A. electrical energy to chemical energy

Answer

B. electrical energy to heat energy

Answer

D. mechanical energy to electrical energy

Answer

E. mechanical energy to light energy

Question 9

Which of the following pairs is an example of translucent bodies?

Accepted Answer

C. Frosted glass and waxed paper

Answer

A. Cardboard and moon

Answer

B. Clear water and glass

Answer

D. Oiled paper and brick

Answer

E. Wood and metal sheet

Question 10

An object is placed in front of a concave mirror whose radius of curvature is 12cm. If the magnification of the Image produced is 1.5, how far is the object from the mirror?

Accepted Answer

B. 10cm

Answer

A. 8cm

Answer

C. 15cm

Answer

D. 18cm

Answer

E. 20cm

Question 11

Which of the statements is/are true of two bodies involved in an inelastic collision? After collision. I. the kinetic energy increases II. The momentum decreases III. Their velocities are the same.

Accepted Answer

C. III only

Answer

A. I only

Answer

B. II Only

Answer

D. I and II only

Answer

E. II and III only

Question 12

When a yellow card is viewed in blue light, It will appear

Accepted Answer

A. black

Answer

B. orange

Answer

C. purple

Answer

D. red

Answer

E. white

Question 13

The most suitable instrument for measuring the diameter of a thin wire is a

Accepted Answer

B. micrometer screw gauge

Answer

A. meter rule

Answer

C. pair of dividers

Answer

D. pair of engineer’s calipers

Answer

E. venire calipers

Question 14

Which of the following is a percussion Instrument?

Accepted Answer

E. Xylophone

Answer

A. Flute

Answer

B. Guitar

Answer

C. Piano

Answer

D. Trumpet

Question 15

When some ice cubes are added to a glass of warm water, the glass is cooled by a process of

Accepted Answer

C. conduction and convection

Answer

A. conduction only

Answer

B. convection only

Answer

D. conduction and radiation

Answer

E. radiation only

Question 16

491 K is equivalent to

Accepted Answer

B. 218 °C

Answer

A. 273 °C

Answer

C. 373 °C

Answer

D. 491 °C

Answer

E. 764 °C

Question 17

A box is pulled a distance s along a smooth horizontal floor by a force of magnitude F, inclined at an angle θ to the horizontal. The work done is

Accepted Answer

A. Fs cos θ

Answer

B. Fs cosec θ

Answer

C. Fs sec θ

Answer

D. Fs sin θ

Answer

E. Fs tan θ

Question 18

A body moves along a circular path with uniform angular speed of 0.6 rad s-1 and at a constant speed of 3.0 $ms^{-1}$. Calculate the acceleration of the body towards the centre of the circle.

Accepted Answer

B. 1.8 $ms^{-2}$

Answer

A. 0.2.$ms^{-2}$

Answer

C. 5.0 $ms^{-2}$

Answer

D. 5.4 $ms^{-2}$

Answer

E. 25.0 $ms^{-2}$

Question 19

In which of the following is the expansion of solids a disadvantage?

Accepted Answer

C. The balance wheel of a watch

Answer

A. Electric iron

Answer

B. Fire alarm

Answer

D. The bimetallic thermometer

Answer

E. The fitting of wheels in rims

Question 20

Notes of the same frequency sounded on a guitar and trumpet may differ in I. loudness II. Pitch III. quality Which of the statements above is correct?

Accepted Answer

C. III only

Answer

A. I only

Answer

B. II only

Answer

D. I and II only

Answer

E. I, II and III

Question 21

A stone of mass 0.7 kg is projected vertically upward with a speed of 5 $ms^{-1}$. Calculate the maximum height reached. [g =10$ms^{-2}$]

Accepted Answer

A. 1.25m

Answer

B. 1.50m

Answer

C. 2.50m

Answer

D. 3.75m

Answer

E. 5.00Nm

Question 22

A radio station broadcasts at a frequency of 400 kHz. If the speed of the wave is 3.0 ×10$^{-8}$ms$^{-1}$, calculate the wavelength of the radio wave.

Accepted Answer

E. 7.5 × 10-14m

Answer

A. 1.3 × 102m

Answer

B. 3.0 × 102m

Answer

C. 2.4 × 102m

Answer

D. 5.0 × 102m

Question 23

Two metals A and B lose the same quantity of heat when their temperatures drop from 20°C to 15°C. If the specific heat Capacity of A Ii thrice that of B, calculate the ratio of the mass of A to that of B.

Accepted Answer

E. 1:03

Answer

A. 3:01

Answer

B. 4:03

Answer

C. 3:04

Answer

D. 1:02

Question 24

An object of mass 5.0 cg moving with a velocity of 12$ms^{-1}$ due north hits a stationary body of mass 7.0kg. If they stick together after collision and move with velocity V due north, calculate the magnitude of V.

Accepted Answer

D. 5$ms^{-1}$

Answer

A. 12$ms^{-1}$

Answer

B. 7$ms^{-1}$

Answer

C. 6$ms^{-1}$

Answer

E. 4$ms^{-1}$

Question 25

Mercury does NOT wet glass because

Accepted Answer

C. the cohesive force is greater than the adhesive force.

Answer

A. glass is an amorphous substance

Answer

B. the adhesive force is greater than the cohesive force

Answer

D. mercury has very high thermal conductivity

Answer

E. mercury is opaque.

Question 26

Calculate the peak voltage that could be obtained from a 220 V$_{r.m.s}$main supply.

Accepted Answer

D. 311.1V

Answer

A. 70.7V

Answer

B. 110.0V

Answer

C. 155.6V

Answer

E. 440.0V

Question 27

A constant force acts on a body of mass 50kg and changes its speed from 20$ms^{-1}$ to 90$ms^{-1}$ in 10 seconds. Calculate the magnitude of the force applied.

Accepted Answer

D. 350N

Answer

A. 590N

Answer

B. 500N

Answer

C. 450N

Answer

E. 180N

Question 28

The length of a simple pendulum is increased by a factor of four. By what factor is its period Increased?

Accepted Answer

D. 2

Answer

A. 0.25

Answer

B. 0.5

Answer

C. 1.66

Answer

E. 4

Question 29

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

Accepted Answer

E. Split rings

Answer

A. Armature

Answer

B. Carbon brushes

Answer

C. Magnet

Answer

D. Slip ring

Question 30

The angle between the geographic and the magnetic meridians at a place on the earth’s surface is the

Accepted Answer

A. angle of declination

Answer

B. angle of depression

Answer

C. angle of dip.

Answer

D. latitude of the place

Answer

E. longitude of the place

Question 31

Three non-parallel coplanar forces which can be represented both in magnitude and direction by the three sides of a triangle taken in order will

Accepted Answer

A. have any one force being the equilibrant of the other two

Answer

B. make a body move randomly

Answer

C. make a body oscillate

Answer

D. move a body along a straight line

Answer

E. rotate a body about its axis

Question 32

Which of the following is a desirable property of a fuse Wire?

Accepted Answer

E. Low melting point

Answer

A. High expansively

Answer

B. High thermal conductivity

Answer

C. Low density

Answer

D. Low electrical resistivity

Question 33

Which of the following statements is/are correct? Sound waves travel through I. air II. vacuum III.Water

Accepted Answer

D. I and III only

Answer

A. II only

Answer

B. I and II only

Answer

C. II and III only

Answer

E. I, II, and III

Question 34

Radio receivers are tuned using

Accepted Answer

D. variable capacitors

Answer

A. electromagnets

Answer

B. electric motors

Answer

C. Inductors

Answer

E. variable resistors

Question 35

A 12V battery supplies a current of 0.4A to a lamp. Calculate the resistance of the lamp.

Accepted Answer

A. 30.00

Answer

B. 4.80

Answer

C. 3.00

Answer

D. 0.30

Answer

E. 0.03

Question 36

Which of the following statements is correct?

Accepted Answer

E. Gamma rays have no mass and a high penetrating power

Answer

A. Alpha particles have a large mass and high penetrating power

Answer

B. Alpha particles have a small mass and a low penetrating power

Answer

C. Beta partials have no mass and a high penetrating power

Answer

D. Beta particles have a large mass and a low penetrating power

Question 37

A voltage of 240V is connected to the primary coil of a transformer, the rating of the primary turns to the secondary turns if the voltage available at the secondary coil is 15V

Accepted Answer

D. 16

Answer

A. 0.06

Answer

B. 0.9

Answer

C. 1.6

Answer

E. 36

Question 38

Which of the following statements is/are correct? Sound waves travel through I. air II. vacuum III.Water

A.II only
B.I and II only
C.II and III 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 III only

Answer

A. I only

Answer

B. III only

Answer

C. I and II only

Answer

E. II and III only

Question 39

The escape velocity of an object from the gravitational field of a planet I. Increases with the mass of the object II. Increases with the mass of the planet III. Is smaller on the moon than on the earth. Which of the above statements is/are correct?

Accepted Answer

D. II and III only

Answer

A. I only

Answer

B. II only

Answer

C. I and II only

Answer

E. I, II and III

Question 40

Which of the following will reduce the frequency of oscillation of a simple pendulum?

Accepted Answer

C. Increasing the length of the string

Answer

A. Decreasing the length of the string

Answer

B. Increasing the amplitude of oscillation

Answer

D. Increasing the mass of the bob

Answer

E. Reducing the mass of the bob.

Question 41

Which of the following radiations has the shortest wavelength?

Accepted Answer

E. X-rays

Answer

A. Infrared rays

Answer

B. Light waves

Answer

C. Microwaves

Answer

D. Ultraviolet rays

Question 42

Which of the following is/are longitudinal wave(s)? I. Light waves from the sun II. Sound waves in the air III. Waves on a vibrating string

Accepted Answer

B. II only

Answer

A. I only

Answer

C. I and II only

Answer

D. I and III only

Answer

E. II and III only

Question 43

The following are derived units EXCEPT

Accepted Answer

E. kg

Answer

A. kg m-3

Answer

B. N

Answer

C. Ns

Answer

D. m3

Question 44

A projectile is projected with an initial velocity u, at an angle θ to the horizontal. The maximum height attained is.

Accepted Answer

D. U2 sin2$\frac{	heta}{2g}$

Answer

A. U2 sin  $\frac{	heta}{g}$

Answer

B. 2U2 sin2 $\frac{	heta}{g}$

Answer

C. U sin2 $\frac{	heta}{g}$

Question 45

The charge of an alpha particle can be neutralized by

Accepted Answer

C. 2 beta particles

Answer

A. 1 beta particle

Answer

B. 2 photons of gamma rays

Answer

D. 4 beta particles

Answer

E. 4 photons of gamma rays

Question 46

Which of the following is a non-renewable energy source?

Accepted Answer

A. Coal

Answer

B. Hydro

Answer

C. Ocean waves

Answer

D. Solar

Answer

E. Tides

Question 47

Calculate the magnitude of the force due to a magnetic field of 0.40T on an electron moving perpendicular to the field with a speed of 4.00 × 106$ms^{-1}$ (e 1.60 × 10-19C]

Accepted Answer

C. 2.56 × 10-13N

Answer

A. 6.40 × -10

Answer

B. 6.40× 10-13N

Answer

D. 1.60 × 10-12N

Answer

E. 2.30 × 10-11N

2005 NECO Physics Past Questions

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