# SECTION A – OBJECTIVES

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

1. The critical angle for light travelling from a transparent medium to air is measured as 340. Calculate the refractive index of the medium.

(a) 0.56

(b) 1.50

(c) 1.79

(d) 2.02

2. Which of the following phenomena causes capillarity of liquids in tubes in narrow bore?

(a) Viscosity

(b) Surface tension

(c) Osmosis

(d) Brownian Motion

3. An object is placed at a distance of 2f from a converging lens of focal length F. The image distance is ______.

(a) 2f

(b) F

(c) f/2

(d) f/4

4. An object placed a distanced from a converging lens of focal length 10cm forms an image which is 20 cm from the lens and on the same side of the lens as the object. The value of d is ______.

(a) 3.3 cm

(b) 6.7 cm

(c) 10.0 cm

(d) 2.0 cm

5. The image formed a diverging is always ______.

(a) magnified, virtual and erect

(b) diminished, real and inverted

(c) diminished, virtual and inverted

(d) diminished, virtual and erect

6. A magnifying glass produces an image which is positioned 30cm from the lens and is five time the size of the object. The distance between the object and the magnifying glass is ______.

(a) 3.0 cm

(b) 4.5 cm

(c) 6.0 cm

(d) 7.5 cm

7. The reason why a 450 triangular glass prison can be used as a reflector of light is that ______.

(a) it is transparent

(b) the angle of reflection is equal to the angle of incidence

(c) the refractive index of glass is greater than 1

(d) the critical angle for glass is less than 450

8. A camera lens having a focal length of 18cm is focused on an object which is 90cm away. To obtain a sharp image the distance between the lens and film must be ______.

(a) 15 cm

(b) 20 cm

(c) 22.5 cm

(d) 45 cm

9. A body pulls a box along a horizontal table with a rope inclined to the horizontal at angle 600. If the tension in the rope is 40N. What is the effective horizontal force?

Given – Sin 600 = 3/2, Cos 600 =  ½, tan 600=3, cot 600 = 1/3

(a) 20N

(b) 20 3 N

(c) 40 3 N

(d) 40/3 N

10. A man walks 5km south and then 3km in the direction 600 west of south. His distance from the starting point is ______.

(a) 7.00 km

(b) 7.50 km

(c) 8.00 km

(d) 10.72 km

11. Which of the following instruments is most suitable for measure of a narrow pipe a few millimeter in diameter?

(a) Pair of calipers

(b) Metre rule

(c) Micrometre screw guage

(d) Tape rule

12 . Which of the following sources of energy is renewable?

(a) Petroleum

(b) Charcoal

(c) Hydro

(d) Nuclear

13. Which of the following is a set of vectors?

(a) Weight, Displacement and moment

(b) Velocity, volume and up thrust

(c) Density, capacitance and distance

(d) Mass, force and impulse

14. Calculate the current in the 3 ohm resistor shown in the diagram below –

(a) 3.0 A

(b) 4.0 A

(c) 12.0 A

(d) 39.0 A

15. A force acting on a body causes a change in the momentum of the body from 12kgm/s to 16kgms-1 in 0.25. Calculate the magnitude of the impulse.

(a) 28. ONS

(b) 20 ONS

(c) 4 ONS

(d) 0.8 NS

16. Infra-red rays of frequency 6 x 1012H2 have a wave length of 5 X105m vacuum. The wave length of X-rays of frequency 3X1018H2 is ______.

(a) 1010 m

17. The component of the spectrum of white light having the shortest wave length is ______.

(a) green

(b) orange

(c) red

(d) violet

18. A narrow beam of white light travelling in air is incident on a triangular glass prism. The colour that experiences the greatest deviation is ______.

(a) red

(b) violet

(c) blue

(d) yellow

19. Which of the following is a primary colour of light?

(a) orange

(b) yellow

(c) white

(d) red

20. The resistivity of a given wire of cross sectional area 0.7 mm² is 4.9×10¯4 m length of the wire

(a) 0.4 ohm metre

(b) 1.42 ohm metre

(c) 0 ohm metre

(d) 1.0 ohm metre

21. When a body is acted upon by several forces and its does not acceleration or rotates, the body is said to be in ______.

(a) space

(b) equilibrium

(c) motion

(d) uniform retardation

22. A pulley system has a velocity ratio of 6 and an efficiency of 75%. The effort needed to lift a load of mass 135 kg is ______.

(a) 1013 N

(b) 300 N

(c) 225 N

(d) 30 N

23. The velocity ratio of an inclined plane of angle θ is ______.

(a) sin θ

(b) tan θ

(c) 1/sin θ

(d) 1/tan θ

24. ______ is the turning effect of a force about a point.

(a) Momentum

(b) Weight

(c) Speed

(d) Moment

25. Consider the expression W = mg, if the weight W = 24 N and acceleration due to gravity g=10m/s², what will be the mass m of such body?

(a) 10 kg (b) 24 kg (c) 2.4 kg (d) 100 kg

# SECTION B – FILL IN THE GAPS

26. ______ is a device by means of which work can be done.

27. The product of mass and velocity is also known as ______.

28. The instrument used to measure temperature is ______.

29. Express in equation, the general law of Gas law ______.

30. The distance covered by the waves after one complete oscillation measured in meters is called ______.

# SECTION C – THEORY

INSTRUCTION – ANSWER ONLY FOUR (4) QUESTIONS IN THIS SECTION.

QUESTION 1

A. State factors affecting the deviation of a ray in a triangular glass prism.

B. A 600 prism is of refractive index 1.5 calculate the angle of refraction of the light passing through the prism at minimum deviation.

C. The angle of incidence at minimum deviation.

QUESTION 2

A. Water is poured into a jar bottom to a depth of 24cm. The bottom of the jar appear to be raised by 6cm when viewed vertically. Calculate the refractive index of water.

B. State the laws of refraction.

QUESTION 3

A. Explain the term lens and describe the difference between the two lenses.

B. Using converging lens as a case study, describe the characteristics of image formed when object is placed at a distance greater than 2f from lens.

QUESTION 4

A. An object placed 4cm in front of a converging lens of focal length 10cm produced magnified image 7cm high.

Find,

I. The position of the image

II. The size of the object

B. Distinguished between a compound microscope and astronomical telescope.

QUESTION 5

A. With the aid of a label diagram describe the human eye

B. State two defects of human eye and how it can be corrected?

QUESTION 6

A. Explain the term dispersion.

B. Explain what is meant by the pure spectrum of light. Draw a labelled ray diagram showing the arrangement of the apparatus necessary to obtain a pure spectrum of white light

C. Using HB Pencil draw,

I. Ammeter

II. Aneriod Barometer

III. Anenometer

IV. Micro meter screw guage

V. Vernier Calliper