# Neco Physics Questions And Answers 2023

## Neco Physics Questions And Answers 2023

Welcome to zamfara blog, where you will read  complete neco physics questions and answers 2023.

The physics exam is divided in to two section, Objective and Theory section i.e Paper 1 and 2 .

### OBJECTIVES QUESTIONS

#### PHYSICS PAPER I.

1. A capacitor of charge 7.5x10C has a potential of 50 V. What is its capacitance?
6.7×10-15μF
A. 6.7×10-15.
B. 1.4×10°
C. 1.5×10
D. 7.5×10-2
E. 3.8×10-μF

2. The S.I. unit of pressure is
A. Nm-1
B. Nm-2
C. Nm
D. Nm.
E. N㎡.

3. Which type(s) of motion is exhibited by a tuning fork struck on a hard object?
A. Oscillatory
B. Random and oscillatory
C. Rotational
D. Rotational and translational
E. Translational

4. Calculate the time in minutes,thast n will take a car travelling at 120 kmh to cover a distance of 20 km.
A. 0.2
B. 6.0
C. 10.0

D. 12.0
E. 24.0

5. A man travelled 5 km north,then 7 km east. Calculate his displacement from the starting point.
A. 8.6 km,N35.5°E
B. 8.6km,N45.6°E
C. 8.6km,N54.5°E
D. 12.0 km,N35.5°E
E. 12.0 km,N45.6°E

6. An example of an object in a state of stable equilibrium is a/an
A. ball on a flat surface. B.
C. bunsen burner on its base.
D. cone resting on its vertex.
E. cylinder resting on its side.egg in a bowl.

7. A stone is projected horizontally from the top of a cliff with a velocity of 12 ms-1. If it reached the ground 2 s later,calculate the height of the cliff.
[g=10ms-2]
A. 10.0m
B. 14.4m
C. 20.0m
D. 24.0m
E. 44.0m.

8. The angular velocity of a body changed uniformly from 250 rads-1 to 400 rads- in 20 s. Calculate the magnitude of its angular acceleration.

9. Which of the following pairs of forces is field force only?

A. Electrostatic and tension
B. Frictional and gravitational
C. Gravitational and magnetic
D. .Tension and electrical
E.. .Magnetic and friction

10. Calculate the effective resistance in the circuit below.

A. 1.33 Ω
B. 4.00 Ω
C. 5.33 Ω
D. 8.00Ω
E. 10.00Ω

11. The electrical device used to control the amount of current passing through a circuit is called

A. fuse.
B. galvanometer.
C. jockey.
D. rheostat.
E. switch.

12.  Three capacitors of capacitances 1μF,3 μF and 5 μF are connected in parallel across a 400 V source. Calculate their total charge.

A. 3.6×10-3
B. 6.0×10-3
C. 2.6×10
D. 6.1×104(
E. 4.4×10-7

13. In the right hand grip rule,the thumb and fingers respectively point in the direction of

A. current and force.
B. current and magnetic field.
C. force and current.
D. magnetic field and current.
E. magnetic field and force.

14.  The following statements about an electromagnet are correct except that

A. its end where the current flows in the clockwise direction is the north pole.
B. it is a temporary magnet.
C. it is made of soft iron core.
D. it produces strong magnetic field.
E. it is used to separate iron from a mixture of metals.

15. A man weighing 80 kg climbed up a flight of stairs to a height of 30 m in 10 s. Calculate the power he expended.[g=10ms-2]

A. 24000 W
B. 8000 W
C. 2400 W
D. 800 W
E. 24W

16. An inclined plane with velocity ratio 2 has an efficiency of 70%. Calculate the force required to push a load of 140 N up the plane.

A. 25N
B. 100N
C. 196N
D. 200N
E. 400N

17. The following can lead to energy crisis except

A. ASUU strike.
B. military coup.
C. political upheavals.
D. price hike of fuel.
E. vandalization of pipelines.

18. A body of mass 120 g moving with a velocity of 10 ms- collides with a wall and moves with a velocity of 5.0 ms- in the opposite direction. Calculate the change in its momentum.

A. 1.80 Ns
B. 1.60 Ns
C. 1.20 Ns
D. 0.90 Ns
E. 0.60 Ns

19. A steel rod 40 cm long at 25C increased to 40.04 cm at 100℃. Calculate its linear expansivity.

A. 1.3×10-5K-1
B. 1.0×10-5K-1
C. 7.5×10-3K-1
D. 1.3×10-3K-1
E. 1.0×10-3K-1

20.  The diagram below represents two waves A and B travelling alongside each other.
Calculate the difference between the wavelengths of B and A.

A. 1m
B. 2m
C. 3m
D. 4m
E. 5m

21. Which of the following waves requires a material medium for its propagation?

A. Microwave
C. Sound
D. Visible light
E. X-ray

22. A light ray B is incident on a mirror X and after reflection strikes mirror Y as shown in the diagram below. Calculate its angle of reflection from mirror Y.

A. 30°
B. 45°
C. 50°
D. .60°
E. 90°

23. A concave mirror of radius of curvature 10 cm produced an image two times the size of the object. Calculate the object distance.

A. 15.0cm
B. 10.0cm
C. 7.5cm
D. 5.0cm
E. 2.5 cm

24. A ray of light is incident on a glass block at an angle of 65°. Calculate the angle of refraction of the light.[Refractive index of glasglass=3/2]

A. 37°
B. 43°
C. 74°
D. 90°
E. 98°

25. The following are electromagnetic waves:

I. Ultraviolet rays
II. Micro waves
A. I,II and III
B. I,III and II
C. II,I and III
D. II,III and I
E. III,II and I

26. Which of the following statements is/are not correct about the lenses of the human eye and a simple camera? Both

I. are converging
II. have fixed focal length
III. produce real and inverted image
A. I only
B. II only
C. III only
D. I and II only
E. I and III only

27. A plucked string produced a note of 230 Hz when its length is 2.0 m. Calculate its length when the frequency is 260 Hz.

A. 6.00m
B. 5.60m
C. 2.26m
D. 1.77m
E. 0.56m

28 .A boy standing far away from a wall clapped his hands and heard the echo few seconds later. Which of the wave properties is responsible for this occurrence?

A. Diffraction
B. Interference
C. Polarization
D. Reflection
E. Refraction

29. Which of the following pairs of forces is field force only?

A. Electrostatic and tension
B. Frictional and gravitational
C. Gravitational and magnetic
D. Tension and electrical
E. Magnetic and friction

40. The electrical device used to control the amount of current passing through a circuit is called

A. fuse.
B. galvanometer.
C. jockey.
D. rheostat.
E. switch.

41. Three capacitors of capacitances 1μF,3 uF and 5 μF are connected in parallel across a 400 V source. Calculate their total charge.

A. 3.6×10-3
B. 6.0×10-3
C. 6×10 2.6×10-C
D. 6.1×1046.1x10C
E. 4.4×10-7

42. In the right hand grip rule, the thumb and fingers respectively point in the direction of

A. current and force.
B. current and magnetic field.
C. force and current.
D. magnetic field and current.
E. magnetic field and force.

43. The following statements about an electromagnet are correct except that

A. its end where the current flows in the clockwise direction is the north pole.
B. it is a temporary magnet.
C. it is made of soft iron core.
D. it produces strong magnetic field.
E. it is used to separate iron from a mixture of metals

44. B.i Ω resistor is connected in series to a capacitor of reactance 400 Ω. If the combination is connected to an a.c.source of 4 V,calculate the impedance in the circuit.

A. 20.5Ω
B. 45.0Ω
C. 200.0Ω
D. 400.5Ω
E. 420.0Ω

45. The peak value of current in a circuit is 16.0 A. Calculate the root mean square value.

A. 32.0A
B. .22.6 A
C. 16.0A
D. 11.3A
E. 8.0A

46. The difference between crystals and amorphous substances is that,crystal substances

A. are liquid at all temperatures while amorphous substances are not.
B. are insoluble in water while amorphous substances are soluble.
C. have no definite shape while amorphous substances do.
D. have regular repeated pattern of particles while amorphous substances do not.
E. soften gradually when heated while amorphous substances melts suddenly.

I intermolecular forces.
II forces of attraction.
III responsible for capillary action.
32. Which of the statements above is/are correct?

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

48. Bohr explained the stability of the atom by assuming that

A. electrons are in continuous motion in an atom.
B. electrons are embedded in the nucleus.
C. electrons can only move within specific energy levels.
D. .the number of electrons and protons for an atom is the same.
E. the nucleus is positively charged.

49. Two radioactive samples X and Y have half-lifes of 120 minutes and 150 minutes respectively. Calculate the ratio of the remaining sample of X to Y after 600 minutes.

A. 1:2
B. 2:1
C. 4:5
D. 5:4
E. 31:30

50. The mass defect of a nucleus is 2×10-°kg. Calculate its binding energy.
[c=3x108ms-1]
A. 6.0x102J
B. 1.8x1010J
C. 1.8x1011J
D. 6.0x1014J
E. 1.8x1022J

51. What does Z represent in the fusion equation below?

}H+3H→ Z +’n+energy
A. Alpha particle
B. Beta particle
C. .Electron
D. .Neutron
E. Proton

52 .An electron losses 9 x10-19 J of energy when it droped from an excited state to a lower energy level. Calculate the wavelength of the emitted photon. [h=6.6×10-34Js,c=3.0x108ms-11

A. 1.98×10-25m
B. 2.44×10-24m
C. 2.20×10-7
D. .4.55x106m
E. 4.09×1023

53. A photon of wavelength 4.0.0×10-71m emitted electron from a metal surface. Calculate the energy of the photon. [h=6.6×10-34Js,c=3.0x108ms-]

A. 8.80×10-9J
B. 2.64×10-41J
C. 1.65×10-27J
D. 1.98×10-25J
E. .4.95×10-19J

54. The following is explained by particle nature of matter. Emission of
I. electrons when light falls on a metal surface.
II. electrons when a filament is heated.
III.neutrons during radioactivity. Which of the above statements is/are correct?

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

55. A semi-circular plot of land has a diameter of 250 m. Calculate its area in acres.
[π=3.14,1 acre=4047㎡]

A. 3.86
B. .6.06
C. .12.12
D. .15.44
E. .24.25

56. The components that control the amount of light entering a camera are

A. aperture and lens.
B. diaphragm and shutter.
C. film spool and aperture.
D. lens and film.
E. shutter and aperture.

57. A telescope has objective and eyepiece lenses of focal lengths 50 cm and 30 cm respectively. Calculate its magnifying power.

A. 0.60
B. 1.67
C. 20.00
D. 80.00
E. 1500.00

58. The similarity between molo(an indigenous guitar) and sekere/ichaka is that both

C. are struck.
D. are plucked.
E. can be tunned.

59.A device used to detect small potential difference is a/an

A. electroscope.
B. hot-wire ammeter.
C. moving coil galvanometer.
D. moving iron ammeter.
E. potentiometer.

60. Electricity transmission from a power station requires the following:
I High tension cable
II Step up transformer
III Step down transformer
Which of the following is the correct order of their application?
A. I,II and III
B. I,III and II
C. II,I and III
D. II,III and I
E. III,II and I.

### THEORY QUESTIONS

#### PAPER II   PART I.

1(a). Mention two components of a flat plate collector.

(b) Differentiate between the operations of NigeriaSat-I and NigComSat-I
(c) The objective lens of a compound microscope produced an image twice the object size. If the image is 5 cm from the eyepiece lens and the final image is 15 cm from it,calculate the magnifying power of the microscope.

2(a). Differentiate between scalar and vector quantities.

(b) Two vectors A and B acting in opposite direction have magnitudes of 3 N and 4 N respectively.Calculate the magnitude of their resultant force.

3. State the:
i. Principle of floatation
ii. Two factors affecting floatation of an object

4. A boy climbed up 6 steps each of height 0.3 m in 12 s expending energy at the rate of 60 W.Calculate the:
i. Energy expended
ii.Mass of the boy
[g=10ms-]

5 (a). State a type of electric charge and how it is produced.

(b) A mass of gas occupies 500 cm3 at 23°C and 600 mmHg. Calculate its volume at 37C and 720 mmHg.

6 (a). Distinguish between longitudinal and transverse waves.

(b).Give two examples of mechanical waves.

7. State:
i. One of the laws of reflection of light
ii. Two instruments that work based on the principle of reflection of light
8.(a) Define resistivity of a material.

(b) A resistor of resistance 0.5 Ω is made from a wire of length 4.0 m and resistivity 3.0×10-Ωm. Calculate the cross-sectional area of the wire.

9(a) What is a dielectric substance?

(b) The charge on each plate of a 3 uF capacitor is 6x10C.Calculate the potential difference between the plates.

10(a) Mention two uses of nuclear energy.

(b)i.What is the value ofx and y in the nuclear equation below?
24Th→ie+%Pa +energ
24Th→qe+/%Pa +energy
Name the type of nuclear reaction represented in b(i)above.
11(a) State two types of crystal structure.

(b lculate the uncertainty in measuring the energy of a photon which is radiated in a time interval of 10-3s.
[h=6.6×10-34Js,π=3.14]

#### PART II.

12(a) State two:

(b) i. State why the motion of a simple pendulum does not continue indefinitely.
ii.Mention the factor that affects the period of oscillation of a simple pendulum at a place.
iii.A simple pendulum is set into vibration from its rest position. Sketch a graph of the variation of the potential energy and kinetic energy of the pendulum with time in one cycle of motion.

(c) A uniform metre rule on a knife edge at the 60 cm mark has a mass of 70 g hung at the 90 cm mark and a mass X hung at the 20 cm mark to balance it horizontally.
i. Sketch the set up.
ii. Calculate X.

13(a)List two renewable energy resources other than solar energy and one application of each.

(b)i. State the principle of conservation of linear momentum.
ii. Use the principle stated in b(i)to explain the recoil of a gun.

(c) A hot water tap delivers water at the rate of 100 gswhile a cold water tap delivers water at the rate of 200 gs- at a temperature of 20℃.When both taps are left on for 3 minutes the temperature of the mixture was 30℃.Calculate the temperature of the hot water, ignoring heat loss to the surrounding.

14(a) Mention the two types of wavefronts.

(b) i. Define forced vibrations.
ii.Distinguish between the vibrations of an air column in a closed pipe and in an open pipe.

(c) i. State the law of refraction other than Snell’s law.
ii. A ray of light experiences a minimum deviation of 60° when passing through an equilateral triangular prism. Calculate the refractive index of the prism.

15(a)i. Give two devices that use magnetic field for their operation.
ii. State Faraday’s law ofelectromagnetic induction.

(b)What are the defects of a primary cell and how are they prevented?

(c) i. Distinguish between a capacitor and an inductor.
ii. Two capacitors A and B of capacitances 3 μF and 9 uF respectively are connected in parallel to a direct current source. Calculate the ratio of the energy stored in A to that in B.

(b) i. Mention two hazards of nuclear reaction.
ii. State two reasons why a nuclear reactor has not been built in Nigeria.

(c) An electron was emitted from a metal surface with kinetic energy of 1.6×10-18J.If the threshold frequency of the metal is 4.5 x1014 Hz,calculate the:
i. Work function of the metal
ii. Stopping potential of the electron
[h=6.6×10-34Js,e=1.6×10-19C]

17(a) List two basic components of a rocket and their corresponding functions.

(b) Differentiate between a compound microscope and an astronomical telescope.

(c) What are the components of a simple cell?

(d) State:
i. Two applications of a solar collector
ii. One application of a solar panel

(e) A telescope is to be constructed with a magnification of 5. If one of its lenses has a focal length of 15 cm,calculate the two possible values of the focal length of the second lens
required.