2002 NECO Physics Past Questions & Answers

Question 1

A negatively charged rod is brought near the cap of an electroscope. The cap is earthed momentarily while the charge is near to it. The rod is then removed. Which statement is correct?

Accepted Answer

C. The cap and the leaf will be positively charged

Answer

A. The cap will be positively charged and the leaf will be negatively charged

Answer

B. The cap will be negatively charged and the leaf will be positively changed

Answer

D. The cap and the leaf will be negatively charged

Answer

E. none

Question 2

The ability of the eye to focus on objects at various distances is known as

Accepted Answer

A. accommodation

Answer

B. astigmatism

Answer

C. eye ring

Answer

D. myopia

Answer

E. presbyopia

Question 3

In an operating X-ray tube, a high p.d is applied between the cathode and the anode for the purpose of

Accepted Answer

A. accelerating the electrons to a very high energy

Answer

B. concentrating electrons on the target

Answer

C. heating the anode

Answer

D. heating the cathode

Answer

E. producing a stream of electrons

Question 4

In the normal use of a simple microscope, a person sees an

Accepted Answer

B. erect, virtual and magnified image

Answer

A. erect, real and magnified image

Answer

C. inverted, virtual and magnified image

Answer

D. inverted, real and magnified image

Answer

E. inverted and real image the same size as the object

Question 5

A body is uniformly accelerated from rest. Which of the following quantities vary/varies linearly with the square of the time? I. Displacement II. Velocity III. Momentum

Accepted Answer

A. I only

Answer

B. II only

Answer

C. III only

Answer

D. I and II only

Answer

E. II and Ill only

Question 6

A body of mass M1 moving with a velocity U collides with a stationary body of mass M2 and both move with a common velocity V. If linear momentum is conserved, which expression correctly represents V?

Accepted Answer

D. M1U ÷ M1+ M2

Answer

A. M1 + M2 ÷ M1U

Answer

B. M2U ÷ M1 – M2

Answer

C. M1U ÷ M1 – M2

Answer

E. M2U ÷ M1 + M2

Question 7

If the refractive index of water is 1.33, what is the critical angle for a water-air boundary?

Accepted Answer

D. 48.8 °

Answer

A. 36.0 °

Answer

B. 40.2 °

Answer

C. 41.8 °

Answer

E. 62.7 °

Question 8

A body executing a simple harmonic motion has an angular velocity of 22 radians per second. If it has a maximum displacement of 10cm, what is its linear velocity?

Accepted Answer

E. 2.2$ms^{-1}$

Answer

A. 1100$ms^{-1}$

Answer

B. 440 $ms^{-1}$

Answer

C. 220 $ms^{-1}$

Answer

D. 22 $ms^{-1}$

Question 9

An object weighing 0.60N is hung on a spiral spring and caused it to extend by 6.0cm. The object is removed and a black of wood replacing it causes the spring to extend by 10.0cm. What is the weight of the block of wood?

Accepted Answer

D. 1.00N

Answer

A. 0.10N

Answer

B. 0.36N

Answer

C. 0.80N

Answer

E. 3.60N

Question 10

If the temperature of a resistance wire is gradually increased, its resistance will

Accepted Answer

D. increase gradually

Answer

A. decrease gradually

Answer

B. first increase and then decrease

Answer

C. first increase and then remain the same

Answer

E. remain the same

Question 11

What part of the camera corresponds to the iris of the eye?

Accepted Answer

A. diaphragm

Answer

B. film

Answer

C. focusing ring

Answer

D. lens

Answer

E. shutter

Question 12

A brass cube of side 10cm is heated through 30°C. If the linear expansivity of brass is 2.0 × I0$^{-5}$ K-1 , what is the increase in its volume?

Accepted Answer

E. 1.80cm3

Answer

A. 0.06 cm3

Answer

B. 0.18cm3

Answer

C. 0.60cm3

Answer

D. 1.20cm3

Question 13

Which process will increase the rate of oscillation of a pendulum?

Accepted Answer

B. decreasing the length of the pendulum

Answer

A. decreasing the amplitude of oscillation of the pendulum

Answer

C. decreasing the mass of the pendulum

Answer

D. increasing the length of the pendulum

Answer

E. increasing the mass of the pendulum.

Question 14

A converging lens of focal length 5cm forms a virtual image which is 20cm from the lens. How far from the lens is the object?

Accepted Answer

B. 4.0 cm

Answer

A. 2.0cm

Answer

C. 6.7cm

Answer

D. 20.0cm

Answer

E. 25.0cm

Question 15

A transformer supplies 12V when connected to a 240V mains. If the transformer takes 0.120A from the mains when used to light a 12V, 24W lamp, what is its efficiency?

Accepted Answer

C. 83.30%

Answer

A. 57.20%

Answer

B. 66.60%

Answer

D. 92.50%

Answer

E. 100%

Question 16

What is the escape velocity of a satellite launched from the earth’s surface? (Take g as 10ms$^{-2}$ and the radius of the earth as 6.4 × 10$^6$m)

Accepted Answer

B. 11.2 × 10k$ms^{-1}$

Answer

A. 7.80 × 10k$ms^{-1}$

Answer

C. 3.56 × 107$ms^{-1}$

Answer

D. 6.00 × 107$ms^{-1}$

Answer

E. 1.20 × 108$ms^{-1}$

Question 17

It is NOT possible to determine exactly and simultaneously the position and momentum of a particle. This statement is known as the

Accepted Answer

D. Heisenberg’s uncertainly principle

Answer

A. Crompton effect

Answer

B. de Broglie’s laws

Answer

C. Frank-Hertz experimental law

Answer

E. wave-particle paradox

Question 18

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.

Accepted Answer

D. I and III only

Answer

A. I only

Answer

B. II only

Answer

C. III only

Answer

E. II and III only

Question 19

Which is a fundamental unit?

Accepted Answer

A. ampere

Answer

B. joule

Answer

C. Newton

Answer

D. ohm

Answer

E. watt

Question 20

What is stored by a dry Leclanhé cell?

Accepted Answer

A. chemical energy

Answer

B. heat energy

Answer

C. mechanical energy

Answer

D. nuclear energy

Answer

E. solar energy

Question 21

What does NOT affect the rate of evaporation of a liquid

Accepted Answer

E. volume of the liquid.

Answer

A. exposed surface area of the liquid

Answer

B. humidity of the surroundings

Answer

C. nature of the liquid

Answer

D. temperature the liquid

Question 22

When a current of 1 .0A flows in an electrolyte for 3.0h, a mass of 1 .0g is deposited. What mass will be deposited in 10.0h if a current of 3.0A flows through the electrolyte?

Accepted Answer

C. 10.0g

Answer

A. 30.0g

Answer

B. 24.0g

Answer

D. 6.0g

Answer

E. 0.4g

Question 23

An object is projected with a velocity of 50$ms^{-1}$ from ground level at an angle θ to the vertical. If the total time of flight of the projectile is 5s, what is the value of θ? (g = 10$ms^{-2}$)

Accepted Answer

D. 60°

Answer

A. 0°

Answer

B. 30°

Answer

C. 45°

Answer

E. 90°

Question 24

An air bubble of volume 4cm3 is formed 20m under water. What will be its volume when it rises to just below the surface of the water if the atmospheric pressure is equivalent to a height of 10cm of water?

Accepted Answer

E. 12cm3

Answer

A. 2cm3

Answer

B. 4cm3

Answer

C. 6cm3

Answer

D. 8cm3

Question 25

In which simple machine is the effort applied between the load and the fulcrum?

Accepted Answer

D. sugar tongs

Answer

A. claw hammer

Answer

B. nut crackers

Answer

C. pliers

Answer

E. wheelbarrow

Question 26

The use of electrical fuses in domestic wiring is

Accepted Answer

D. to cut off the mains supply it too high a current flows

Answer

A. to prevent and electrical shock

Answer

B. to supply electricity to all the electrical appliances

Answer

C. to allow electricity to flow easily through the mains to all the circuits

Answer

E. to fuse all the circuit into one

Question 27

The energy stored in a capacitor of capacitance 5 μF is 40J. What is the voltage applied across its terminals?

Accepted Answer

E. 4000V

Answer

A. 4V

Answer

B. 8V

Answer

C. 16V

Answer

D. 200V

Question 28

The silvered walls of a vacuum flask minimise loss of heat due to

Accepted Answer

E. radiation only

Answer

A. conduction and convection

Answer

B. conduction only

Answer

C. convection and radiation

Answer

D. convection only

Question 29

An a.c. generator can be converted into a d.c. generator by replacing

Accepted Answer

A. the slip rings with split-ring commutators

Answer

B. the slip rings with armatures

Answer

C. the split-rings with slip rings

Answer

D. the split-rings with brushes

Answer

E. the brushes with slip-ring commutators.

Question 30

A man stands in front f a high wall and produces a sound. If he receives the echo of the sound four seconds later, what is his distance from the wall? [The speed of sound in air is 330$ms^{-1}$]

Accepted Answer

B. 660m

Answer

A. 1320m

Answer

C. 400m

Answer

D. 330m

Answer

E. 165m

Question 31

An electric heater takes 4A when operated on a 250V supply. What is the cost of the electricity consumed at 10k per kWh when the heater is used for 5 hours?

Accepted Answer

B. 50k

Answer

A. 10k

Answer

C. N1.00

Answer

D. N5.00

Answer

E. N10.00

Question 32

A body of mass 4 kg is accelerated from rest by a steady force of 9N. What is its speed when it has travelled a distance of 8m?

Accepted Answer

A. 6 $ms^{-1}$

Answer

B. 18 $ms^{-1}$

Answer

C. 32 $ms^{-1}$

Answer

D. 36 $ms^{-1}$

Answer

E. 48 $ms^{-1}$

Question 33

Which radiation is emitted when a beam of fast moving cathode rays is stopped by a heavy element?

Accepted Answer

E. X-rays

Answer

A. Alpha rays

Answer

B. Gamma rays

Answer

C. Positive rays

Answer

D. Ultraviolet rays

Question 34

According to the Kinetic Theory, what does NOT occur when the temperature of a constant volume of gas is increased?

Accepted Answer

A. a decrease in the mean speed kinetic energy of the molecules

Answer

B. an increase in the mean speed of the molecules

Answer

C. an increase in the momentum change at each collision.

Answer

D. an increase in the number of collisions per second

Answer

E. an increase in the pressure exerted by the gas.

Question 35

A platinum-resistance thermometer has a resistance of 10 ω at 0°C and 18 ω at 100°C. Assuming that resistance changes uniformly with temperature, what is the resistance of the thermometer when the temperature is 45°C?

Accepted Answer

C. 13.6

Answer

A. 27.8

Answer

B. 17.8

Answer

D. 6.4

Answer

E. 3.6

Question 36

The wavelength of a stationary wave is 36.0cm. What is the distance between a node and the next anti-node?

Accepted Answer

B. 9.0cm

Answer

A. 6.0cm

Answer

C. 18.0cm

Answer

D. 360cm

Answer

E. 72.0cm

Question 37

A block of ice of mass 10kg at 0°C absorbs heat energy from its surroundings and changes to water at the same temperature. The heat absorbed is referred to as

Accepted Answer

B. latent heat

Answer

A. heat capacity

Answer

C. specific heat

Answer

D. specific heat capacity

Answer

E. specific latent heat.

Question 38

Lenz’s law of electromagnetic induction states that

Accepted Answer

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

Answer

A. e.m.f. is induced in a circuit whenever there is a change in the magnetic flux linked with the circuit

Answer

B. the induced e.m.f. in a circuit is proportional to the rate of change f the number of lines of force linking the circuit

Answer

D. a force is exerted in a current-carrying conductor in a magnetic field.

Answer

E. the induced e.m.f. is proportional to the current producing the magnetic flux.

Question 39

A body of weight 20N displaces 12N of the liquid in which it is immersed. What is the upthrust of the liquid on the body?

Accepted Answer

D. 12N

Answer

A. 240N

Answer

B. 32N

Answer

C. 20N

Answer

E. 8N

Question 40

Which of the following is a percussion instrument?

Accepted Answer

A. bell

Answer

B. flute

Answer

C. guitar

Answer

D. piano

Answer

E. organ

Question 41

In which of the following are the substances arranged in descending order of their thermal conductivities?

Accepted Answer

C. copper, aluminium, iron

Answer

A. aluminium, copper, iron

Answer

B. aluminium, iron, copper

Answer

D. copper, iron. aluminium

Answer

E. iron, copper, aluminium

Question 42

An object 8cm in front of a plane mirror moves at a speed of 6cm s-1 away from the mirror. What will be the distance separating the object and the image after 2s?

Accepted Answer

E. 40cm

Answer

A. 8cm

Answer

B. 12cm

Answer

C. 20cm

Answer

D. 28cm

Question 43

Which colour is deviated least when white light passes through a triangular prism?

Accepted Answer

C. red

Answer

A. green

Answer

B. indigo

Answer

D. violet

Answer

E. yellow

Question 44

Which statement is NOT correct about Rutherford’s model of the atom?

Accepted Answer

C. The model is applicable to atoms with one electron in the outer shell

Answer

A. The diameter of the nucleus is of the order of 10-15m

Answer

B. The mass of an atom is concentrated in the nucleus

Answer

D. The nucleus of an atom is positively charged

Answer

E. The nucleus is surrounded by an electron cloud.

Question 45

If the size of the hole of a pinhole camera is increased, the image formed becomes

Accepted Answer

A. brighter and blurred

Answer

B. brighter and larger

Answer

C. brighter and sharper

Answer

D. blurred and duller

Answer

E. blurred and larger

Question 46

Which device does NOT make use of the magnetic effects of an electric current?

Accepted Answer

A. hot-wire ammeter

Answer

B. moving-coil ammeter

Answer

C. moving-coil loudspeaker

Answer

D. moving-iron ammeter

Answer

E. telephone earpiece

Question 47

A short response time is obtained in a liquid-in-glass thermometer when the

Accepted Answer

E. bulb is thin-walled and the liquid is a good conductor of heat.

Answer

A. bulb is large and thick-walled

Answer

B. bulb is small and thick-walled

Answer

C. stem is long and thin

Answer

D. liquid is of high density and the bulb is large

Question 48

The phenomenon of photoelectric effect is NOT used in

Accepted Answer

B. bimetallic strip thermometers

Answer

A. automatic doors

Answer

C. light meters in cameras

Answer

D. setting off burglar alarms

Answer

E. sound production from film tracks.

2002 NECO Physics Past Questions

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