enwaecphysics2017

more

THEORY QUESTIONS

WAEC SYLLABUS

1. The diagram above illustrates a micrometer screw gauge. Determine its readings.

A. 2.44mm

B. 2.46mm

C. 2.86mm

D. 2.96mm

2. Which of the following demission represents impulse?

A.MLT -2

B. MLT-2

C. MLT

D. ML

3. A body accelerated uniformly from rest at 2ms^-2. Calculate is velocity when it had travelled a distance of

A. 9m. 3.0ms^-1

B. 4.5ms^-1

C. 6.0ms^-1

D. 18.0ms^-1

4. Which of the following statements about matter is not correct?

A. Molecules of solids move freely than molecules of liquids and gas

B. Molecules of liquids are more closely packed than those of the liquids

C. Energy is required to break the intermolecular forces of attraction between Molecules.

D. Molecules of liquids move about with in liquid and they are in constant random motion.

5. A ball is a project horizontally from the top of a lower. Neglecting air resistance, which of the following statements about its motion is /are correct?

i. Vertical force on the ball decreases as its fall

ii. The vertical force of the bass remains constant

iii. The vertical speed of the ball increases as it falls

A. I only

B. II only

C. I and II only

D. II and III only

ANSWERS

6.Two force 100N and 60N act on an object of mass 10kg as illustrated in the diagram above. Neglecting friction, calculate the acceleration of the object,

A. 4.0 ms^-2

B. 13.1ms^-2

C. 16.0ms^-2

D. 22.6ms^-2

7. A body weight 14n in air is partially immersed in water. If the mass of water displaced in the process is 200g, calculate the up thrust in the body. [g = 10ms^-2

A. 2.0 N

B. 3.0 N

C. 3.5 N

D. 7.0 N

8. Which of the following process is not surface phenomenon?

A. Condensation

B. Evaporation

C. Photo Emission

D. Thermionic Emission.

9. A chemical balance is used for measuring.

A. Volume

B. Mass

C. Thickness

D. Density

10. A body is whirled round a circle path at constant speed. Which of the following diagrams correctly indicates the direction of the body’s velocity (v) and acceleration (a)?

ANSWERS

11. A motorist travelling a 72kmh^-1 had his eyes shut for 0.4 s during a hard sneeze. Calculate the distance covered by him during this time interval.

A. 50.0m

B. 28.8m

C. 17.0m

D.8.0m

12. The angle at which a projectile must be fired to cover maximum range is.

A. 30⁰

B. 45⁰

C. 60⁰

D. 90⁰

13. A body can undergo the following type of motion except?

A. Random

B. Rotational

C. Translational

D. Relative.

14. Which of the following graph correctly represents the relationship between the kinetic energy (K.E) and the displacement (d) from point of release of a swinging pendulum bob?

ANSWERS

18. The diagram above illustrates a beaker of water being heated. It is observed that as the bubbles rise they get bigger in size. The reason for this observation is.

A. Water pressure on the bubbles decreases.

B. Density of water increases with rise in temperature

C. Volume of water increases with rise in temperature

D. Atmospheric pressure on the bubbles decreases

19. Which of the following devices transforms light energy to electrical energy?

A. Bulb

B. Television

C. Solar Cell

D. Light Emitting Diode (LED)

20. A motor of a corm mill machine operates on electrical energy of 1.44 x 10⁵j. If one-quarter of the energy is wasted in the form of sound and heat, determine the efficiency of the machine.

A. 25%

B. 36%

C. 64%

D. 75%

ANSWERS

26. Which of the following statement about 3rd over-one of a vibrating air column of an open pipe is correct? It has 4 nodes B. 5 nodes C. 3 antinodes D. 4 antinodes

27. Consider the wave equation: y = 10 sin 7 (x - 50 t). What does the number 10 in the equation represent? Acceleration B. Speed C. Amplitude D. Wavelength.

28. Plane waves passing through a narrow gap emerge as circular waves. This phenomenon is known as. Interference B. Dispersion C. Refraction D. Diffraction.

29. A ray of light at an angle in a rectangular prism grazes the surface of the prism on emerging from the prism. Determine the value ofθ. [Absolute refractive index of the materials of the prism is 1.5]. 41.80 B. 47.20 C. 60.80 D. 90.00

30. The diagram above illustrates a wave set-p between two fixed ends 4.0 m apart. If the speed of the wave is 1.0ms-1, its wavelength and frequency respectively are. 1m: 0.25 Hz B. 2m: 0.25 Hz C. 2M: 0.50 Hz D. 4m: 0.50 Hz

ANSWERS

31. Two plane mirrors are inclined at an angle 200 to each other. Determine the number of images formed when an object is placed between them. 17 B. 18 C.19 D. 20

32. A Converging lens of focal length 10cm forms an erect image three times the size of a real object. Calculate the distance between the object and the image. 6.6 cm B. 11.0 cm C. 13.3 cm D. 20.0 cm

33. The inverse of the time required for a wave to complete one full cycle is called. Wavelength. B. Period. C. Frequency. D. Amplitude.

34. Two bar magnets are placed near each other. Which of the following diagram correctly illustrates the magnetic field pattern formed by the part?

35. The force per unit charge experienced at a point a field id the. Gravitational field strength. Electric potential Electric filed intensity Magnetic field strength.

ANSWERS

A lamp rated 100 W, 240 V is lit for 5 hours. Calculated the cost of lighting the lamp if 1 kWh of electrical energy cost ₦5. ₦2.50 B. ₦3.20 C. ₦6.50 D. ₦9.60 A battery of e.m.f. 3.0 V is connected across a potentiometer wire AB of 10m-1 as illustrated in the Diagram above. If the jockey J makes contact at the 30 cm mark, determine the resistance of length AJ and voltage across AJ. 3.0 Ω : 0.9 V B. 3.0 Ω 3.0 V C. 3.3 Ω 0.3 V D. 3.3 Ω 9.0V The main reason why a.c is transmitted at very high voltage and low current is that it. Flows faster through the conductor Can be steeped down Is cheaper to generate Reduces heat loss. The diagram above illustrate two bodies X and Y separated by a distance r. each charge q and mass M. which of the following statement about electrostatic force Fe and the gravitational force Fg acting between the bodies is correct? F is attraction While Fg is repulsion. Both Fe and Fg are repulsion Both Fe and Fg are that of attraction Fe is repulsion while Fg is attraction The opposition offered to an alternating current in a C-R series circuit is known as. Impedance B. Resistance C. Reactance D. Friction. Which of the following pairs of concepts constitutes complementary variables as expressed by the Heisenberg uncertainly principle? Momentum and time Energy and Acceleration. Position and momentum Velocity and momentum The nucleon number of an atom is the total number of. Electron and protons Electrons and neutrons Neurons minus electrons Protons and neutrons The energy levels in the mercury atom are illustrated in the diagram above. Calculate the ionization energy of the atom. +21.2 eV B. + 10.4 eV C.10.4 eV D.-21.2 eV Which of the following statements about gamma radiation is correct? Gamma radiation can Be seen by the naked eye Not pass through and aluminum foil Be present naturally in our surrounding Be used as a tracer. Radio wave Micro wave Infrared wave P Q R Gamma ray The table above shows the components of electromagnetic spectrum in order of increasing frequency. Which of the following sets correctly indentifies P, Q and R respectively? Visible, Ultraviolet, X-Ray. X Ray, Visible, Ultraviolet Ultraviolet, Visible X-Ray X-Ray, Ultraviolet, Visible.

ANSWERS