robertnjiru35

For the mirror equation to hold for a plane mirror (do = -di), what must the focal length(and radius of curvature) be?

A concave makeup mirror is designed so the virtual image it produces is four times the size of the object when the distance between the object and the mirror is 18 cm. What is the radius of curvature of the mirror?

The radius of curvature of a plane mirror is

(A) between one and eternal

(B) zero

(C) One

(D) Eternal

 Instrument for measuring blueness of the sky or ocean is called ___________.

(A) Bathymeter

(B) Ceraunograph

(C) Cyanometer

(D) Barometer

Where does electric power reside in a charged conducting material?

(A) Central part

(B) Over the body

(C) Depends on the nature of the body

(D) The outer surface

Which of the following elements has lowest melting point? 

(A) Titanium

(B) Sulphur

(C) Argon

(D) Zinc

Which item is used in the fabrication of the transistor?

(A) Silicon

(B) Silver

(C) Aluminum

(D) Copper

X-rays cannot pass through what?

(A) skin

(B) bone

(C) meat

(D) wood

Image formed due to far-sightedness?

(A) posterior to the retina

(B) on the retina

(C) beyond the retina

(D) nowhere

What is the minimum distance of clear vision?

(A) 25 cm

(B) 50 cm

(C) 100 cm

(D) Eternal

Which of the following unit is Newton?

(A) force

(B) Displacement

(C) distance

(D) energy

The small hole in the middle of the iris is called?

(A) pupil

(B) blood plate

(C) Retina

(D) frontend

Which of the following metals has maximum thermal conductivity?

(A) Iron

(B) Aluminum

(C) Silver

(D) Copper

Used in eyeglasses for a person suffering from myopia?

(A) convex lens

(B) concave lens

(C) concave mirror

(D) convex mirror

What is a Coolidge tube used to produce?

(A) Micro waves

(B) Radio waves

(C) X Rays

(D) None of these

B. Which is best? Read each scenario and decide which type of government makes the most sense. Would a direct democracy like in Athens work best, or would a republic like in Rome make more sense?

A new nation just created a constitution, and needs the approval of the residents. At last count, the population was at 5 million.

Everybody votes in a democracy! OR Select representatives from different regions to speak for their neighbors. WHY?