contohsoalansains1(2)

8/2/2019 contohsoalansains1(2)

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Code No: SN 3311 P4

SECTION A(10 marks)

Answerall questions

1. The table below shows four different organisms and their methods of asexual

reproduction.

Organism Method of asexual reproduction

(I) Amoeba

(II) Hydra

(III) Honey Bee

(IV (IV) Fasciola

(a) Budding

(b) Binary fission

(c) Polyembryony

(d) Parthenogensesis

Which of the following is the correct pair of the organism and its method of asexualreproduction?

I II III IV

(A) b a c d

(B) b a d c

(C) c b d a

(D) d c b a

2. Which of the following is not the difference between spermatogenesis andoogenesis?

Spermatogenesis Oogenesis

(A)Produces small gamete Produces big gamete

(B)Produces four gametes Produces one gamete

(C)Produces two spermatocytes inmeiosis I

Produces two secondary oocytein meiosis I

(D) Meiosis II occurs immediatelyafter the meiosis I

Meiosis II occurs when the spermpenetrates the secondary oocyte

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Code No: SN 3311 P4

3. How does epigeal germination differ from hypogeal germination?

I. The cotyledons are above the ground.

II. The epicotyl forms a hook and elongates.

III. The hypocotyl forms a hook and elongates.

IV. The plumule are still enclosed within the cotyledons.

V. Exposing to light will stimulate the straightening of the epicotyls.

(A) I, III and IV only

(B) II, IV and V only

(C) I,II, III and V only

(D) II, III, IV and V only

4. Which of the following shows the right sequence the formation of male plant gametes?

(A) Microspore mother cell, Meiosis, Microspore, Mitosis, Generative Nucleusand Tube Nucleus

(B) Microspore mother cell, Meiosis, Microspore, Meiosis, Generative Nucleusand Tube Nucleus

(C) Microspore mother cell, Meiosis, Generative Nucleus and Tube Nucleus,Mitosis, Microspore

(D) Microspore mother cell, Mitosis, Generative Nucleus and Tube Nucleus,Mitosis, Microspore

5. Which statements are true about the differences between spermatogenesis andoogenesis?

Spermatogenesis Oogenesis

I The number of gametesproduced per meiosis is four

The number of gametesproduced per meiosis is one

II The size of gametes produced is

big

The size of gametes produced

is small

III Cytokinesis results in an unequal Cytokinesis results in an

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Code No: SN 3311 P4

distribution of the daughter cellsproduced

equal distribution of thecytoplasm

IV Meisosis occurs continuouslyand does not stop at any stage

Meiosis does not occurcontinuously but stops atsome stages

V Process starts at the age of thepuberty of a male

Process starts at thedevelopment of the foetus ofa female

(A) I, II and IV only

(B) I, IV and V only

(C)II, III, IV and V only

(D) I, III, IV and V only

6. Human Chorionic Gonadotrophin (HCG) is important in embryo development.

Based on the above statement, which of the following statements are true?

I level of oestrogen increases when HCG is low

II level of progesterone decreases when HCG is low

III corpus luteum degenerates when HCG is low

IV low HCG causes miscarriage

V level of progesterone increases when HCG is low

(A) I , II and III only

(B) II, III and IV only

(C ) I, II, III and I V only

(D) II, III, IV and V only

7. Which of the atomic orbitals form an bond when the orbitals overlap?

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Code No: SN 3311 P4

(A) two sp2 orbitals

(B) two lateral p orbitals

(C) two opposing linear p orbitals

(D) an s orbital and an sp3 orbital

8. Which of the following alkene can exist in cis- and tran- forms?

CH3 CH2 CH2 CH = CH2

CH3 CH= C (CH3 ) CH3

CH3 CH2 CH = CH CH3

CH3 CH2 CH(CH3) CH = CH2

9. What is the IUPAC nomenclature for the compound below?

CH3 CH CH2 CH2 CH CH3l lCH2 CH3lCH3

(A) 2, 5 dimethylheptane

(B) 3, 6 dimethylheptane

(C) 2- ethyl 5 methylheksane

(D) 5 - ethyl --2 -- methylheksane

10. Which of the following pair is correct ?

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Code No: SN 3311 P4

(A)

(B)

(C)

(D)

11.Give an IUPAC name for the following hydrocarbon.

(CH3)3CCH2CH3

(A) 2-methylpentane

(B) 2,2-dimethylbutane

(C) 1,1,1-trimethylpropane

(D) 1,1,2-trimethylpropane

12.The percentage composition of a compound P is C, 60.0%; H, 13.3% and O,26.7%.

Determine the empirical formula of P.

(A) C2H9O

(B) C3H8O

(C) C3H9O

(D) C2H8O

13.Which of the following graphs describes the variation of the magnetic flux density Bwith distance rfrom a long straight wire carrying a constant

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Molecular formula Type of hybridization

C6H6 sp3

C2H6 sp

C6H6 sp2

C2H2 sp2


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Code No: SN 3311 P4

current I?

(A)

(A)

(A)

(A)

14.An electron charge -1.6 X 10-19 C is moving with velocity 2.0 X 106 m/s at an angle

300 with the direction of an uniform magnetic field, B.

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B

r

B

r

B

r

B

r


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If the magnetic force exerted on the electron is 1.6 X 10-12 N, the magnitude of B is

(A) 5.0 T

(B) 10.0 T

(C) 15.0 T

(D) 20.0 T

15.An operational amplifier can be used as a differential amplifier.

What is the function of a differential amplifier?

(A) It acts as an oscillator.

(B) It inverts the input voltage by 1800 out of phase.

(C) It compares between input voltage and output voltage.

(D) It amplifies the difference of positive input voltage and negative inputvoltage.

16.

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Code No: SN 3311 P4

Figure 1

Refer to figure 1, the purpose of resistor R2 is to

(A) increase the bandwidth.

(B) increase the gain of the amplifier.

(C) convert the amplifier into an inverting amplifier.

(D) limit the alternating input applied to the amplifier.

17. A proton moving with uniform velocity enters a magnetic field which isperpendicular to its direction.

The proton will then move in a

(A) straight line as before.

(B) straight line parallel to the magnetic field.

(C) circle at a plane normal to the magnetic field.

(D) parabola at a plane normal to the magnetic field.

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Code No: SN 3311 P4

(C) Finite input impedance

(D) Zero output impedance

20.

Figure 2

Figure 2 shows an inverting amplifier. What is the voltage gain of the amplifier?

(A) 8

(B) 8

(C) 10

(D) 10

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30 k

3 k

-

+

24 kVin Vout


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Code No: SN 3311 P4

SECTION B

1.Mother cell of embryo sac Embryo sac

Figure 1

Figure 1 shows the simplified diagram of the development of a plants embryo sac.

(a) Identify the parts that show the structure of the egg cell and the polar

nuclei

The egg cell : ___________________________________________

The polar nuclei :____________________________________________

(2 marks)

(b) Explain how the process in Figure 1 occurs.

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XE

Y

Z

W


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Code No: SN 3311 P4

__________________________________________________________

___________________________________________________________

___________________________________________________________

___________________________________________________________

(4 marks)

(c) The products of the double fertilization in plants are a diploid zygote (2n) anda triploid nucleus (3n).

Explain briefly the development of the zygote and the triploid nucleus

The zygote:

___________________________________________________________

___________________________________________________________

___________________________________________________________

The triploid nucleus:

___________________________________________________________

___________________________________________________________

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Code No: SN 3311 P4

___________________________________________________________

(4 marks)

1. (a) State the type of asexual reproduction of these organisms:

Paramecium : ____________________________________________

Hydra : ____________________________________________(2 marks)

(b)

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time

volume

time

volume

Figure 1


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Code No: SN 3311 P4

Figure 1 shows the growth pattern of an organism.

Explain why the curve appears to be discontinuous.

________________________________________________________

________________________________________________________

________________________________________________________

________________________________________________________(3 marks)

(c) ( i) If a girl ovulates on the 20th of August, estimate the period ofher fertile phase and when her menstruation starts.

___________________________________________________

___________________________________________________

___________________________________________________(2 marks)

(ii) As one oocyte is released from human ovary every 28 days,discuss what might happen to the egg cell.

___________________________________________________

___________________________________________________

___________________________________________________

___________________________________________________

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Code No: SN 3311 P4

___________________________________________________(3 marks)

(a) (i) Name the compound represented by the structural formula

below.

CH3

CH3 C CH2 CH2 CH3

CH3

_____________________________________________________

(2 marks)

(ii) Draw the structure for 4-methyl-3-hexanone

(2 marks)

(b) Compound X is a mixture of two cis/trans (geometric) isomer. Itscomposition by mass is C = 47.1%, H = 6.5% and Cl = 46.4%

(i) Calculate the empirical formula of X.

(4 marks)

(ii) The molecular formula is the same as the empirical formula.

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Code No: SN 3311 P4

Draw a diagram showing the two cis/trans isomers of substance X.

(2 marks)

(a) What is geometrical isomerism?

_______________________________________________________

_______________________________________________________

_______________________________________________________(2 marks)

(b) Ethane and ethene are hydrocarbons.

( i) Which one exhibit geometrical isomerism?

___________________________________________________(1 mark)

(ii) Based on your answer in (b) (i), draw the isomers.

(2 marks)

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Code No: SN 3311 P4

(c) ( i) Complete the following table regarding the two hydrocarbons.

Hydrocarbon Molecular formula Type of hybridization

Ethane

Ethene(2 marks)

(ii) By using a suitable diagram, discuss the sp3 hybridization.

(3 marks)

SECTION C

1. A magnet that has been manufactured has magnetic fields.

(a) A circular coil carries a current of 5.0 A. It has a radius of 3.0 cm and 50turns.

Determine the magnetic field strength at the centre of coil.

(4 marks)

(b) A current of 3.0 A flows in a solenoid of length 2.0 m. The diameter of thesolenoid is small compared with the length of the solenoid.

Determine the magnetic field strength at the centre of the coil and number ofturns which the solenoid must have in order to obtain a magnetic fieldstrength of 3.0 mT at a point inside the solenoid and far from each end of thesolenoid.

(6 marks)

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(c) Suggest a method to make a magnet from an iron screw so that itshead becomes North pole and its tail becomes South pole.

(10 marks)2. (a) Based on the definition of Faradays Law and Lenzs Law, give a

relationship between Faradays law and Lenzs law.(4 marks)

(b)Bar magnet

Figure 2

Figure 2 shows a bar magnet placed in a solenoid. It is observed that whenthe switch is closed, the galvanometer does not show any deflection. The barmagnet is then moved in and out from the solenoid, the galvanometer showsdeflections.

Explain the above observation.

( 6 marks )

(c) A transformer reduces the voltage from 240 V to 24V. A bulb with 24V 6 Wis connected to the secondary circuit.

If the current in the primary coil is 25 mA, calculate the efficiency of thetransformer. Justify your answer on the causes of power dissipation in atransformer and suggest ways in overcoming it.

( 10 marks )

1. A magnetic field is a region where a magnetic force acts on a magnetic pole or acurrent carrying wire.

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Code No: SN 3311 P4

(a) Explain the term magnetic field, B and draw clearly magnetic fieldlines due to a current, I flowing in a straight wire.

(4 marks)

(b) With the aid of a diagram, explain why when a moving electron is placed in a

uniform magnetic field, it will move in a circular path.

(6 marks)

(c) Justify your answer whether it is possible for a charged particle to move withuniform speed:

(i) in an electric field

(ii) in a magnetic field

(iii) in a combined electric and magnetic field.

( 10 marks)

2. Electromagnetic induction is the effect when a wire or coil is moved across amagnetic field.

(a) Faradays law and Lenzs law are used to explain the phenomena ofelectromagnetic induction.

What is the meaning of Faradays law and Lenzs law?

(4 marks)

(b) The primary coil of an ideal iron-core transformer has 1000 turns and thesecondary coil has 50 turns. The primary coil is connected to an alternatingvoltage supply of 240 V. A 3.0 ohm resistor is connected to the secondarycoil.

(i) Determine the voltage across the secondary coil. (3 marks)

(ii) Determine the current in the secondary coil.(3 marks)

(c) In the real situation, efficiency of transformer is not 100%.

Suggest methods increasing the efficiency of the transformer.

(10 marks)

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Code No: SN 3311 P4

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