# SECTION A – OBJECTIVES

INSTRUCTION – CHOOSE THE CORRECT ANSWER FROM THE OPTIONS A – D.

1. A car accelerates uniformly from rest at 5m/s². Determines its speed after 10 secs.

(a) 50.0 mls

(b) 25.0 mls

(c) 2.0 mls

(d) 0.5 mls

2. Calculate the length of a constantan wire of cross sectional area 4II x 10-8 m and resistivity 1.1×10-6- m. (Take π as 22/7).

(a) 2.40 m

(b) 0.42 m

(c) 6.25 m

(d) 183.75 m

3. In a domestic circuit, electrical appliances and lamps are arranged in parallel across the mains so as to enable the ______.

(a) Same current to flow through the electrical appliances and the lamps.

(b) Maximum energy to be consumed at least cost.

(c) Voltage across the appliances not to be affected when the lamps are switched on and off.

(d) Heat loses to be minimized.

4. Which of the following is a fundamental quantity?

(a) Speed

(b) Length

(c) Density

(d) Impulse

5. Four cells of 1.5v, 0.5 ohms are connected in parallel. The total emf (e) will be ______ in volt.

(a) 6.0 V

(b) 2.5 V

(c) 4.8 V

(d) 1.5 V

6. Which of the following is an amorphous substances?

(a) Salt

(b) Sugar

(c) Glass

(d) Sand

7. The internal friction between layers of liquid or gas in motion is known as ______.

(a) Surface tension

(b) Viscosity

(c) Capillary

(d) Cohesion

8. A boy cycles continuously through a distance of 1.0km in 5 minutes. Calculate his average speed.

(a) 3.3 m/s

(b) 16.6 m/s

(c) 20.0 m/s

(d) 0.3 m/s

9. The movement of fluid up or down a narrow tube Is ______.

(a) Osmosis

(b) Brownian Motion

(c) Capillarity

(d) Diffusion

10. A 12 resistor dissipates 8kJ of heat in 20sec. Calculate the current through the resistor?

(a) 6.9 A

(b) 33.4 A

(c) 0 A

(d) 5.8 A

11. Which of the following factors does not affect the electric resistance of a wire?

(a) Length

(b) Mass

(c) Temperature

(d) Cross Sectional Area

12. In which of the following states of matter do the molecules vibrate about their mean positions?

(a) Liquids only

(b) Solid Only

(c) Liquids and gases only

(d) Solids, liquids and gases

13. Which of the following is a unit of the time rate of flow of electric charges?

(a) Coulomb

(b) Volt

(c) Walt

(d) Ampere

14. Which of the following observations is not an effect of surface tension?

(a) Droplets of water dripping slowly from a tap.

(b) Mercury spilled on a clean glass plate forms small spherical droplets.

(c) An insects walking across the surface of a pond.

(d) Water flowing out more easily than engine oil from a container.

15. The potential energy in an elastic string of force constant K which has been extended by x metres is expressed as ______.

(a) 1/2KX

(b) Kx²

(c) ½ KX

(d) KX

16. The engine of a train produces a force of 3000N when moving at 30m/s. Calculate the power of the engine.

(a) 1.0 x 104 W

(b) 3.0 x 106 W

(c) 9.0 x 104 W

(d) 3.6 x 106 W

17. A stone of mass 2kg is thrown vertically upwards with a velocity of 20m/s. Calculate the initial kinetic energy of the stone.

(a) 200 J

(b) 800 J

(c) 1600 J

(d) 400 J

18. Find the cost of running a 60W lamp for 24 hours. If 1KWhr cost 5 Naira.

(a) 14.4 Naira

(b) 12.5 Naira

(c) 7.2 Naira

(d) 2.0 Naira

19. A tuber of cassava can be processed into powder. This explains the fact that ______.

(a) Matter can change spontaneously from one state to another.

(b) Matter cannot be destroyed.

(c) Force is required to change matter from one state to another.

(d) Matter is made up of tiny particle.

20. The process where a liquid turns into vapour below its boiling point is known as ______.

(a) Boiling

(b) Convection

(c) Fusion

(d) Evaporation

21. Energy possessed due to motion is called ______ energy.

(a) kinetic

(b) marine

(c) potential

(d) volt

22. What is the density of an object of mass 20 kg which occupies a volume of 4.5 m³.

(a) 5 kg/m³

(b) 4.7 kg/m³

(c) 4.44 kg/m³

(d) 3 kg/m³

23. Which of these cannot reduce friction?

(a) Lubricants

(b) Bearings

(c) Sharpening

(d) Streamlining

24. One of these Scientists worked on the discovery of electricity.

(b) Newton

(c) Galileo

(d) Edison

25. Random motion can be ______.

(b) movement of smoke particles

(c) Javeline throw

(d) catapult shot

# SECTION B – FILL IN THE GAPS

26. The heat from the sun reaches the earth by ______.

27. ______ is the energy a body possess because it is motion.

28. ______ is defined as the energy at rest due to its level or position above the ground.

29. The two (2) kinds of mechanical energy are ______ and ______.

30. The SI unit of power is ______.

# SECTION C – THEORY

INSTRUCTION – ATTEMPT 4 QUESTIONS ONLY IN THIS SECTION.

QUESTIONS 1

A. What is Brownian Motion?

B. State the two inference that can be drawn from Brownian motion experiments.

C. State four factors affecting the resistance of a wire.

QUESTIONS 2

A. State Hooke’s Law.

A. A force of 50N is applied at the end of a wire 4m long and produced an extension of 0.24mm. If the diameter of the wire is 20mm.

Calculate

I. Stress on the wire

II. Strain in the wire

QUESTIONS 3

Explain the following terms –

A. Electrical work

B. Electrical Energy

C. Electrical Power

D. Potentiometer

QUESTIONS 4

A. State Ohm’s Law.

B. Determine the length and conductivity of a wire with diameter 2.0mm constructed from an alloy of resistivity 22 x 10-8 ohms metre if its resistance is 0.42 ohms. (Take π =22/7)

QUESTIONS 5

A. State one similarity between energy and work.

B. A battery with emf 24V and internal resistance 2.0 is connected to an electric heater of resistance 4.0.

Calculate –

I. The current in the circuit.

II. The power input to the circuit.

III. The power output of the heater.

IV. The energy supplied by the heated in one minute.

QUESTION 6

A. State the three state of matter and describe the characteristics feature of each.

B. State two evidence that support the particle nature of matter.

C. What do you understand by the following terms?

I. Resistivity

II. Conductivity