CGS 09 5116 S4 prelim P1 with Ans

8/14/2019 CGS 09 5116 S4 prelim P1 with Ans.

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This paper consists of 12 printed pages (including the cover page).

2. The figure below shows a simple pendulum. It took 1.4 s for the pendulum toswing from P to Q. Determine the time taken to complete 20 oscillations.

A 2.8 s B 14 s C 28 s D 56 s

3. Which of the following rectangular block will sink in a liquid of density 9 g/cm3?

Block Mass/g Length/cm Breadth/cm Height/cmA 360 10 4 3B 480 5 4 4C 600 5 4 3D 800 10 5 2

1. The diagram below shows part of a micrometer screw gauge. What is the reading

shown?

A 5.24 mm

B 5.74 mmC 7.24 mmD 7.74 mm

P Q


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4. A can, filled with sand, is hung on a long string close to the surface of the Earth.An identical can is hung in the same way close to the surface of the Moon. Thecans are given a sideways push.

Compared with the can hanging close to the Earth, the can close to the Moonstarts to move _________________.

A more easily, as it has less mass.

B more easily, as it has less weight.C with the same ease, as it has the same mass.D with the same ease, as it has the same weight.

5. Which diagram (not drawn to scale) correctly shows the addition of a 5 N anda 12 N force?

A

B

C

D

5 N

12 N

13 N

5 N

12 N

13 N

5 N

12 N

13 N

5 N

12 N

13 N


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6. A hot air balloon filled with gas has a total weight of 2000 N. The balloondescends at a constant speed of 4 m/s. What is the resultant force acting on theballoon during the descent?

A 0 N

B 500 NC 2000 ND 8000 N

7. A brick of weight 80 N stands upright on the ground as shown. What is thepressure it exerts on the ground?

A1020

80

Ncm-2 B80

1020Ncm-2

C510

80

Ncm-2 D80

510Ncm-2

8. The diagram shows two divergent rays of light from an object O being reflectedfrom a plane mirror. At which position will the image be formed?

20 cm

10 cm

5 cm

ground

O A B

C

D


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9. When a pin is placed in front of a convex lens and a plane mirror as shownbelow, an image of the pin is formed at the same position. Which of thefollowing statements is/are correct?

(1) The image is real.

(2) The focal length of the lens is 10 cm.

(3) The position of the image remains unchanged, if the plane mirror ismoved so that its distance is reduced to 2 cm from the lens.

A (3) only B (1) and (2) only

C (2) and (3) only D All are correct

10. Which of the following summarises the change in wave characteristics startingfrom radio waves to gamma-rays in the electromagnetic spectrum?

Wavelength (in vacuum) Speed (in vacuum)A Decreases Remains constantB Increases Remains constantC Decreases IncreasesD Increases Decreases

11. A ship transmits a sound wave vertically downwards onto the seabed. The echo

from the seabed is reflected 1.8 s later. If the depth of the seabed is 1400 m,what is the speed of sound in water?

A. 389 m/sB. 778 m/sC. 1500 m/sD. 1556 m/s

image

pin

10 cm 4 cm

planemirror


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12. The figure below shows two rays of light entering a glass block.

Which equation is correct?

Iz

y

x

w= III

p

q

x

w

sin

sin

sin

sin=

II

q

p

z

y

sin

sin

sin

sin= IV

y

z

w

x

sin

sin

sin

sin=

A III and IV C II and IIIB I and II D II and IV

13. A wave is a mean of transferring energy. This can happen by means of aseries of compressions and rarefactions traveling through a medium. In whichof the following situation does such a wave occur?

A A hammer striking the end of a metal bar.

B A stone thrown into a pond, producing ripples on the surface.

C Heating food under an infra-red grill.

D Radio waves between a transmitter and a receiver.

w

x

y

z

p

q


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14. A current of 5 mA is flowing through a circuit. Calculate the charge driven by theelectrical source in 20 s.

A 0.1 C B 0.25 C C 4.0 C D 100 C

15. The figure below represents the electric field lines in the vicinity of two isolatedelectric charges, A and B

Which statement identifies the charges of A and B?

A A is negative and B is positiveB A is positive and B is negativeC A and B are both positiveD A and B are both negative

16. The resistance of an alloy wire is R. When the length and the diameter of thealloy are both doubled, what is the resistance in terms of R?

A 2R B R

C R/2 D R/4

17. The circuit shows four identical light bulbs connected. Which bulb(s) is/are thedimmest?

A M only B Q only

C N and P only D N, P and Q only

A B

M

N

P

Q

6 V


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18. A plastic rod is rubbed with a dry piece of cloth and the rod becomes positivelycharged. What have happened to the rod and the cloth?

the rod the cloth

A gained protons lost protons

B lost protons gained electronsC gained electrons lost electronsD lost electrons gained electrons

19. A circuit consists of a battery connected in series with resistors R1 and R2 anda pair of resistors R3 and R4, connected in parallel. The potential differencesacross the resistors are V1, V2, V3 and V4.

What is the e.m.f. of the battery?

A V1 + V2B V1 + V2+ V3C V1 + V2+ V3+ V4

D V1 + V2+3

1

V +4

1

V

20. The diagram below shows an electromagnet. The current flows from point A topoint B along the wire.

What is the polarity of the magnet at X and Y?

X Y

A North NorthB North SouthC South NorthD South South

V1

R1 R2

R3

R4

V4

V3

V2


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21 An atom of element Eis represented by 73 E.

Which statement about an atom of Eis correct?

A It is in Group III of the Periodic Table.B It is in Group VII of the Periodic Table.C The total number of protons and neutrons is 10.D The total number of protons and electrons is 6.

22 Element Gburns in oxygen to form a white solid which is soluble in bothhydrochloric acid and sodium hydroxide.

Which of the following is a possible identity of element G?

A Calcium B Magnesium

C Silicon D Zinc

23 Which of the following compounds may be obtained using a water-cooledcondenser in a simple distillation set up?

Compound Melting Point (oC) Boiling Point (oC)

A 135.0 0.5

B 130.0 3.6

C 115.0 30.0

D 33.0 75.0

24 A mixture contains an organic liquid J, and a dilute solution of potassium chloride.Liquid J boils at 21oC and is immiscible in water.

Which two methods of separation should be used to obtain pure samples ofliquid J and solid potassium chloride?

Method 1 Method 2A Use a separating funnel EvaporationB Evaporation Sublimation

C Distillation FiltrationD Filtration Evaporation


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25 The diagram below shows the arrangement of electrons in the outer shells of theatoms in the compound LM2.

Which pair of elements could be L and M?

L M

A Calcium Fluorine

B Carbon Sulfur

C Oxygen Hydrogen

D Sulfur Chlorine

27 Car air bags contain sodium azide, NaN3, which decomposes into its elementswhen heated to 300oC.

2NaN3 2Na + 3N2

What is the volume of gas (at r.t.p.) produced by the decomposition of one moleof sodium azide?A 24 dm3 B 36 dm3C 48 dm3 D 72 dm3

28 124 g of phosphorus vapor has the same volume as 32 g of oxygen gas at the

same temperature and pressure.What is the molecular formula of phosphorous?

A P B P2

C P4 D P6

29 Which of the following metals can be extracted from its oxides by heating it withcarbon?

A Potassium B ZincC Calcium D Magnesium

26 Which of the following statements best explains why elements magnesium andchlorine belongs to the same period in the Periodic Table?

A Magnesium is a reactive metal and chlorine is a reactive non-metal.

B Magnesium and chlorine combine together to form a compound of formulaMgCl2.

C The atoms of both elements have only 3 electron shells containingelectrons.

D The atoms of both elements have 2 electrons in their first electron shell.

: Electrons of L: Electrons of M

L

MM


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30 The equation for the fermentation of glucose to form ethanol is shown below

C6H12O6 2C2H5OH + 2CO2

When 90 tonnes of glucose was allowed to ferment, what is the maximum massof ethanol produced?

A 23 tonnes B 46 tonnes

C 90 tonnes D 180 tonnes

31 Which of the following processes does not involve the reduction of silver ion?

A Silver oxide Silver + OxygenB Magnesium + Silver nitrate Magnesium nitrate + SilverC Silver bromide Silver + BromineD Silver nitrate + Sodium chloride Silver chloride + Sodium nitrate

32 Solution Tcontains a salt which forms a white precipitate when reacted withacidified silver nitrate. When solution Tis boiled with aqueous sodium hydroxide,a gas is evolved which turns damp red litmus blue.

What is the possible identity of the salt in solution T?A Sodium iodideB Sodium chlorideC Ammonium iodideD Ammonium chloride

33 Which of the following will not produce a precipitate when ammonia gas isbubbled into the solution?

A Potassium chloride B Aluminium chloride

C Copper(II) nitrate D Iron(II) sulfate

34 Which of the following human activities does not contribute to global warming?A DeforestationB Burning of fossil fuelsC Destruction of ozone layerD Excessive use of chlorofluorocarbons (CFCs)

35 Some students carried out an experiment to investigate the rate of dissolveingindigestion tablets in water at different temperatures. The following table showed thedifferent experiments they conducted.

Experiment Size of Tablet Mass of Tablet Temperature of Water /oC1

Whole 4 g 252 Crushed 4 g 253 Whole 2 g 254 Crushed 4 g 40

Which two experiments should be compared in order to show the effect oftemperature on the rate of dissolving?A Experiments 1 and 2B Experiments 1 and 4C Experiments 2 and 3


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D Experiments 2 and 4

36 The reaction between the hydrocarbon CxH6 and chlorine can be represented bythe following equation:

CxHy + Br2 CxHyBr2

Which of the following statements about the above reaction is correct?

A It is an addition reaction.B The reaction must take place at high temperature.C The molecular formula of the hydrocarbon is C2H6.D Reaction will result in a brown gas produced.

37. Useful fractions are obtained by the fractional distillation of crude oil.Which of the following fraction is matched correctly to its use?

Fraction UseA Bitumen Fuel for carsB Lubricating oil For making waxes and polishes

C Paraffin (kerosene) For making roadsD Petrol (gasoline) Fuel for aircrafts

38 Polyethenol is a water-soluble plastic. The diagram below shows part of thestructure of polyethenol.

C C C C

OH

H

H OH H

HH H

C

OH

H

C

H

H

Which of the following is a possible monomer for polyethenol?

A

C C

OH

H

H

H

HH

B

C C

OH

H

H

OH

HH

C

C C

OH

H

H

H

D

C C

OH

H

OH

H


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39 The diagram shows a compound X. How can Xbe classified as?

C C

C C

O

O H

CO

O

H

C

H

H

H

H

HH

A As an alkene and as an alcoholB As an alkene and as an acidC As an alcohol and as an alkaneD As an alcohol and as an acid

40 Wine can deteriorate after a period of time because of atmosphericoxidation. Which chemical formula shows the compound formed by theoxidation of the alcohol in wine?

A C2H6O B C2H4O2C C3H6O D C3H6O2

1. 2. 3. 4. 5. 6. 7. 8. 9. 10.

D D C C A A C B D A

D A A A C C C D B C


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End of Paper


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CGS 09 5116 S4 prelim P1 with Ans