Model Exams Ocr

7/30/2019 Model Exams Ocr

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OP EXAMS

A nswer the following questions:

Complete the following statements:

is the distance moved through a unit time, while is the value of displacement at a unit

time.

2. Universe is the space which contains all galaxies planets and living organisms.3. The focal length of the convex lens equals the distance between and

4 reproduction and reproduction are the types of reproduction in living organisms.

5. A car moves with irregular speed, its average speed =

Iil

0 Write the scientific term:

I. It is the phenomenon of the light bouncing off in the same medium when it meets

the reflecting surface.

2. A phase in which some important vital processes occur which prepare the cell for

division and the genetic material in the cell is doubled.

3. The physical quantity that has magnitude and direction.

4. The bigggest star that can be seen clearly by people on the Earth.Q A car can move from rest and its speed reaches 90 mIs in 10 seconds. What is the

acceleration with which the car moved?

(0 Whats meant by:

I. Angle of incidence. 2. Newtons law of universal gravitation.

EOD (;ive reasons for:

The shortsighted person requires medical glasses with concave lenses.

2. Asexual reproduction produces offspring identical to the parents.

3. Speed-time graph for an object moves at regular speed is a straight line parallel to

the time axis.

0 Whats the importance of:

I. Division of somatic cells. 2. Speedometer.

(0 Mention two only of life applications on convex mirror.

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MOPEL EXAMS

1TTIr4]

Choose the correct answer:

I . Speed measurement units are

a. meter.second. b. meter/second.

c. meter2/second. d. meter/second2. A light ray that fell on a plane mirror as in the figure, it reflects,

where the reflecting angle equals

a.30 b.60

900 d 1 200 ///////// f////////./// ///////// f////////.///

3. Our galaxy is called

a. Gemini. b. Milky way. c. Scorpio. d. Ursa major.

4. Reproduction by budding occurs in

a. paramesium. b. yeast fungus. c. amoeba. d. starfish.

Compare between:

1. Mitosis and meiosis (according to location and resulting cells).

2. Real image and virtual image (one point only).EEfl

Answer the following questions:

i]

Place the sign (V) in front of the correct phrases and correct the underlined in the false

ones:

1. The light ray which is incident parallel to the principal axis of a concave mirror,

reflects passing through the center of curvature of its face. ( )

2. Nine planets rotate around the sun. ( )

3. If car (1) took a shorter time than car (2) to cover the same distance so, car (1) was

faster than car (2). ( )

4. Paramecium is divided by binary fission into two identical cells, each is similar to

the

parental cell. ( )

OA convex lens with afocal length of 10 cm. an object was placed at a distance of 20

cm from the lens. Assign the distance of the objects image from the lens and mention

its properties.

What happens when:

1. Incidence of a light ray passes through the focus of a concave mirror.

2. The solar nebula turned into a flat rotating disk.

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tiirj1

0 Write the scientific term:

1. The phenomenon that takes place at the end of prophase (1) and in which some

parts of the two inner chromatids of each tetrad are exchanged to produce new genetic

arrangements.

2. The total distance covered by the moving object divided by the total time taken tocover this distance.

3. The straight line that passes by the center of curvature of the mirror and any point

on its surface besides the pole of the mirror.

4. The expansion of the universe and the merging of atomic particles forming heliun

and hydrogen gases.

0 What are the following numbers indicate?

1. 243 earths day. 2. Number of chromosomes (2N).

0 The opposite graph represents the motion of a body, answer

the following: _________

1. Mention the kind of the speed.Why ? __________

2. Calculate the speed of this body3. Calculate the distance covered by this body after 5 and 10 seconds.

Complete the following statements:

1 . The sun takes about 230 million years to complete one rotation around

2. The somatic cells divide by , while the reproductive cells divide by

3. To obtain a real, inverted and magnified image for a body, we must put it in front

of a concave mirror between the and the

4. Speed is a physical quantity which is used to and the movement of objects.

5. Fungi have sporangia that have a large number of

6. Displacement is the of shortest between two positions (primary position and final

position).

0 Give reasons for:

The difference in the length of the day from a planet to another.

2.The collective lens has two foci, but the collective mirror has one focus.

3.The body which moves with acceleration never moves at regular speed.

o Whats meant by

The length is a scalar quantity

2. The radius of curvature of a converging mirror is 30 cm.

0 Explain how sperms and ova are formed in the human being?

Distance meter

so.

4030

20

10

Time

0 1 2 3 4 5 (see,)

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Question D;0]

0 Study the opposite figure, then answer the questions

Which of the rays c , or can pass

1. Without refraction ? Why?

2. Through the focus ? Why?

MOcEL EXAMSLM odexamII

Answer the following questions

Complete the following sentences

I. When an object moves with decelarating motion, this means that its speed is greater

than its speed.

2. Milky way galaxy took its form after million years of the Big Bang.

3. Vision defects occur because the eye cornea is not always , or the eye ball is not

always4. Starfish reproduces asexually by while bread mould fungus reproduces by

5. The motion in a line in direction is considered the simplest type of motion.

0 Choose the correct answer

1. In the modern theory of solar system evolution, bombing away the star nucleus was

due to

a. the force of gravity b. collision by asteroids.

c. drop in temperature. d. huge nuclear reactions.

2. A car moving on a straight line covers a total distance (d) in a total time (t), the

average speed of the car is given by

a.V=

b.Vzdt

4

d.V

km

3. A concave mirror with a focal length of 20 cm. and the object is placed at a

distanceof 50 cm. from the mirror, the image formed at a distance

a. more than 40 cm b. more than 20 cm. and less than 40 cm.

c. equal to 20 cm d. no correct answcr.

Separation of chromatids takes place in

a. anaphase. b. metaphase c. telophase. d. prophase.

0 Calculate the distance in kilometers between the Sun and a star, f the distance

between them equals 6 light years.

(y: ) _____

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I..A,rit VAIA

Question] I]

1 0 Give reasons for:

I. Sexual reproduction is a source of the genetic variation. 2. Distance is a scalar

quantity, while displacement is a vector quantity

3. The structure called the tetrad is formed during prophase I.O Write the scientific term:

1. Bigger units that form the universe.

2. A phase where some processes occur upon which the formation of chromosomes

that equal in numbers with the parental cell.

3. The amount of change in the bodys speed in a second.

4. The point at which the incident light ray on a mirror, reflects on itself.

Istion p

0 Correct the underlined words:

I . A colony may be formed in reproduction by regeneration.

2. On saturn, the year is 12 earths year.

3. When a body moves in a circular path of length 80cm., therefore the displacementafter a complete round equals 80 cm.

4. If an object at the focus of a convex lens, a very tiny image is formed.

0 Compare between:

1. Long-sight and short-sight.

(concerning the position of the images related to the retina / correction) 2. Speed and

velocity (one point only)

ExaD

Answer the following questions:

Istionjil

0 Put (V) or (x) and correct the wrong ones:

1. The galaxy that our solar system belongs to is Gimini. (

2. Chromatin reticulum intensifies and appears in the form of long, thin and double

strings chromosomes in the telophase of mitosis.

3.The image which is formed by a plane mirror is virtual.

4. When a moving object travels equal distances in equal time intervals, it is said that

is moving at a regular acceleration.

[5O

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MODEL ESAMS

Q The folio ig]&,rey show Htte i.thg wgoniyms

Mcti on the kind & r{)(I uvl ion in each of them

Fig. iii Fig. (31 1g. (4)

GA race car capt & from Yffihionary 1,#u, ,nd if speed reachex S mis thwsgh 10

seconc. C ,ifoI he acceferaon of th carI Q

0 Ce

I - The perpcnd i euLar i cidenl i h I ray OLI a p] jle rrur reflects on [tse]f.

2. Gametes a, EpIid mbr of chn,,]o,nes

3. GuIa.;ics nIoe away Is,,!! each othcu.

0 5h by whww&g th ph w,d the dirccflon4 qmyv when an object is pta thfrQru of

cnctse irror at diIanre less than in f(!i frngth.

(Dflennthe the cIt,cIenszies of theformrd image)

0 .Wenflo,r the I pflwwe of eedouie,

O IVr e the sciailifi ln for cads of 1k lo.vng

l.A /isiufl dcfcct thrugi! [Lich farobjeets oiI> .,, seen c]car]v but doe ubjcvts Ire noccII eLearI

2:rhe [iI is used to Illt[[ chc d[stance bet!! tli cdcstial bodies

3.The stnicor Ilidt is resulted fiorn II] comhinnt[on of gI,nee ad afeniie

galneLe an[I it conta[n the dip]oid ,vrnber of chromo,ii

4.ThedisLacetha[a]T]iI]gojccEcoveI. iO! n tirtittime

O WkI is rnetht b ch a) the_following 2. stars.

L.L.ens

rouein jJ

0 Choae the c.#nei

- AftrtUrn[ng die .qIr Iieu]a Ento a fiat o fonu 1,1 nIs

a. .Merc!ry .Vcnus - arEIl and Mirs Jupitcu .Veiius Lantis and anh

3. reErd

Ic[I!urLg distthe dint aFid ice qMrdjiacd itL

b.Jupter SaL!]rr MHrS- and .NepLuie

d. Jtir,iter - SatLilil Uranus rR[ Ncpurc

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7/8

MODEL EXAMS -. -

2. Gametes 1,,t]on takes pIac [!

a. as!l rBprOduCtioa. b. seMial reprothiclijn.

IgetIcuntiol. i. budd Eng.

3. Which uilEefoI[ow[ng rpl represents [he l,[,Iinn oN dy a Iifonn acce[eratior. 7

ws)I t(.) E(.) t{s.) d.

4. CoLIca-e lcn. Iled [ens.

F,. c[,IieIgiIg

calIectiig d. ito corrcu i,ser

GA bOIIJuIA height 0f24!?! then reboundyfroi the grurd o a d?sksc 4 with in 2

c,rnd calcufak.

I . The i stance cove I by the ball.

2. ]he dis pl i[] illt of the ball.

3. The ave rage vekxity or F[e ball.

0 (,mpa. hefleen d regeneradon.

eIrxam.4 ih followthg q:e,ii,,s

L,estlop1 Hj

C fl,rrcI 11w wt&thned wordy-

Tli e i ncLdnt ray thn L pus-s thrnugh the optical ,i , exits the [ens passi thro.JRh i] Lr

or c rvatu,t.

2. Yea,t fungus is di i cld by the i imFy fLssioa in L?O identical cell Fi is i i lar t die

pareta] cell.

I [Ii (ml peel Ii l

3.Acceleition (a)

4:rlie univeie crerged FrorrL the partles otn u,i&L [liLlogeil.

0 Th oppo.citc fli,re repren,fl.c ,isirns

I. What the bk detecc i this en

2.Vbat h the pe ofthc kns ud to corietthis defect? Lrplainl

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8/8

MOPEL EXAMS

What is the role of these scientists about the evolution of the solar system:

Laplace. 2. Alfred Hale.

j) Complete the following:

The result of dividing the total distance that a moving object covers by the total time

taken to cover this distance is2 is the value of displacement at a unit time and is a quantity.

3. Each produced cell from meiosis contains the number of chromosomes of the

parent cell, so it is called division.

4. A convex mirror has a focal vertex of 20 cm., then half the diameter of its spherical

surface equals

Explain an activity to prove that the universe is in continuous expansion.

0 Give reasons for:

I. Spindle fibers shrink during anaphase.

2. The word AMBULANCE is written in a converted way on the ambulance car.

3. It is hard to measure the regular speed of a moving car practically.

0 Choose the correct answer:1. The sun represents more than from the total mass of the solar system.

a. 9.9% b. 99% c. 90% d. 95%

2. Duplication of genetic material (DNA) occurs in

a. anaphase b. prophase c. interphase d. metaphase

3. Which of these figures represents the correct path of the reflected rays from a

concave mirror?

a. b. c. d.

4. The object moves at constant uniform speed , this means that

a. it moves at zero acceleration.

b. it moves at constant acceleration.

c. it covers equal distances at unequal times intervals.

d. it covers unequal distances at equal times intervals.

1I

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Model Exams Ocr