1. Two plane mirrors form an angle of 90o of each other. If an object is placed between both mirrors, determine the sum of image formed.!a.3 b.3,5 c.7 d.8 e.9

Solution :

n = - m

= - m = 4 – m

Because = 4 (even) then m = 1therefore :n = 4 – 1

= 3

2. What is the formula of equation in curved mirror (spherical mirror).??

a. R x s b. 2.F.s c. = +

d. = + e. = +

Solution :

The formula of equation in curved mirror (spherical mirror) is = +

3. A hollow ball is made of bronze ( α = 18 x 10-6/0C ). At temprature 00C its radius is 1m. If the ball is warmed up to 800C, calculate the area increment of the ball's surface.!a. 1 m2 b. 3 m2 c. 1,15 x 10-2 π m2 d. 5 m2 e. 6 m2

Solution :∆A = A0.β.∆T = (4.π.R2) (2. α) ∆T = (4.π.12) (2.18.10-6) (80 – 0) m2

= 11520 x 10-6 π m2

= 1,15 x 10-2 π m2

4. What is the formula of Pressure's Law.??

A. = B. = c C. A and B is true D. A and B is false E. All of them is true

Solution :

The formula of Pressure's Law is = or = c

5. A coil has resistence of 25 m at temprature of 350C ad 25.17 m at temprature of 500C, determine its temprature coefficient of resistivity.!

A. 10 0C-1 B. 9 x 10 0C-1 C. 4,5 x 10-4 0C-1 D.0.5 E.

Solution :

= ( 1 + α.∆T )

Because = 25 Ω, = 350C, = 25.17 Ω, T = 500C, and ∆T = 500C – 350C = 150C, then25.17 Ω = 25 Ω ( 1 + α.150C )25.17 = 25 + 375 α 0C375 α 0C = 0.17

α = = 4,5 x 10-4 0C-1

6. A certain conductor is passed through 2.4 C electric charges in 2 minues. Determine electric current strength.!A.10 mA B. 12 mA C. 20 mA D. 25 mA E. 30 mA

Solution :

I =

= = 20 mA

7. How many spectrum in electromagnetic waves.??A. 2 B. 9 C. 8 D. 3 E.1

SolutionThere are 8 spectrums in electromagnetic waves.

8. What is the advantages of AM, which is not owned by FM.??A. Cheaper B. Faster C. Wider Range D. Clear E. good

Solution :The range of AM is wider than FM

9. A general election official observes the authenticity of the election card using a loop with strength of 10 diopters. If he has PP 30 cm and want to obtain the maximum angular magnification, calculate the distance of the election card must be placed to the loop.!A. 7.5 cm B. 4 cm C. 3 cm D. 3.5 cm E. 5 cm

Solution :

= + 1

= + 1= 4

= 4

= 4

s = = 7.5 cm

10. A microscope is used to observe an object at distance of 1.5 cm. If the focal length of the objective and ocular lens each is 1 cm and 2.5 cm, and the eye is not in accomodation, determine the microscope length.!A. 5.4 cm B. 5.5 cm C. 6 cm D 10 cm E. 13 cm

Solution :

= +

= +

= -s'ob = 3 cm

d = s'ob + sok

= s'ob + fok

= 3 cm + 2.5 cm= 5.5 cm