Cgs 09 5116 S4 Prelim P1 With Ans.

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

A B C D

2.

5.24 mm 5.74 mm 7.24 mm 7.74 mm

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

P A

3.

2.8 s

Q B

14 s

C

28 s

D

56 s

Which of the following rectangular block will sink in a liquid of density 9 g/cm3? Block A B C D

Mass/g 360 480 600 800

Length/cm 10 5 5 10

Breadth/cm 4 4 4 5

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

Height/cm 3 4 3 2

2

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. The cans are given a sideways push.

Compared with the can hanging close to the Earth, the can close to the Moon starts to move _________________. A B C D

more easily, as it has less mass. more easily, as it has less weight. with the same ease, as it has the same mass. 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 and a 12 N force?

C

A

13 N

13 N 5N

5N

12 N

12 N

D

B

13 N

13 N 5N

5N

12 N

12 N

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6.

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

0N 500 N 2000 N 8000 N

7. A brick of weight 80 N stands upright on the ground as shown. What is the pressure it exerts on the ground? 5 cm 10 cm

20 cm

ground

A

80 Ncm-2 20 × 10

B

20 × 10 Ncm-2 80

C

80 Ncm-2 10 × 5

D

10 × 5 Ncm-2 80

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

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 shown below, an image of the pin is formed at the same position. Which of the following statements is/are correct?

image plane mirror pin 10 cm

10.

4 cm

(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 is moved 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

Which of the following summarises the change in wave characteristics starting from radio waves to gamma-rays in the electromagnetic spectrum?

A B C D

Wavelength (in vacuum) Decreases Increases Decreases Increases

Speed (in vacuum) Remains constant Remains constant 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. B. C. D.

389 m/s 778 m/s 1500 m/s 1556 m/s

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

y

w

x

z

p

q

Which equation is correct?

13.

I

w y = x z

III

sin w sin q = sin x sin p

II

sin y sin p = sin z sin q

IV

sin x sin z = sin w sin y

A B

III and IV I and II

C D

II and III II and IV

A wave is a mean of transferring energy. This can happen by means of a series of compressions and rarefactions traveling through a medium. In which of 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.

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6 14.

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

15.

0.1 C

B

0.25 C

C

4.0 C

D

100 C

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

B

A

Which statement identifies the charges of A and B? A B C D

A is negative and B is positive A is positive and B is negative A and B are both positive A and B are both negative

16. The resistance of an alloy wire is R. When the length and the diameter of the alloy 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 the dimmest? M

6V

N Q P

A

M only

B

Q only

C

N and P only

D

N, P and Q only

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

A B C D

19.

the rod gained protons lost protons gained electrons lost electrons

the cloth lost protons gained electrons lost electrons gained electrons

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

V3 V1

V2

R1

R2

R3

R4

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

V4

20.

A B C

V1 + V2 V1 + V2 + V3 V1 + V2 + V3 + V4

D

V1 + V2 +

1 1 + V3 V4

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

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

A B C D

X North North South South

Y North South North South

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8 21

An atom of element E is represented by 73 E. Which statement about an atom of E is 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 G burns in oxygen to form a white solid which is soluble in both hydrochloric acid and sodium hydroxide. Which of the following is a possible identity of element G? A C

23

24

B D

Calcium Silicon

Magnesium Zinc

Which of the following compounds may be obtained using a water-cooled condenser in a simple distillation set up? Compound Melting Point (oC) Boiling Point (oC) − 135.0 − 0.5 A B

− 130.0

3.6

C

− 115.0

30.0

D

33.0

75.0

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 of liquid J and solid potassium chloride? A B C D

Method 1 Use a separating funnel Evaporation Distillation Filtration

Method 2 Evaporation Sublimation Filtration Evaporation

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9 25

The diagram below shows the arrangement of electrons in the outer shells of the atoms in the compound LM2. : Electrons of L : Electrons of M

L M

M

Which pair of elements could be L and M? L Calcium Carbon Oxygen Sulfur

A B C D 26

Which of the following statements best explains why elements magnesium and chlorine belongs to the same period in the Periodic Table? A B C D

27

M Fluorine Sulfur Hydrogen Chlorine

Magnesium is a reactive metal and chlorine is a reactive non-metal. Magnesium and chlorine combine together to form a compound of formula MgCl2. The atoms of both elements have only 3 electron shells containing electrons. The atoms of both elements have 2 electrons in their first electron shell.

Car ‘air bags’ contain sodium azide, NaN3, which decomposes into its elements when heated to 300oC. 2NaN3
2Na + 3N2 What is the volume of gas (at r.t.p.) produced by the decomposition of one mole of sodium azide? A B 24 dm3 36 dm3 3 C D 48 dm 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? B P2 P A D P6 P4 C

29

Which of the following metals can be extracted from its oxides by heating it with carbon? A B Potassium Zinc C D Calcium Magnesium

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10 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 mass of ethanol produced? B 46 tonnes 23 tonnes A D 180 tonnes 90 tonnes C

31

Which of the following processes does not involve the reduction of silver ion? A Silver oxide
Silver + Oxygen B Magnesium + Silver nitrate
Magnesium nitrate + Silver C Silver bromide
Silver + Bromine D Silver nitrate + Sodium chloride
Silver chloride + Sodium nitrate

32

Solution T contains a salt which forms a white precipitate when reacted with acidified silver nitrate. When solution T is 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 iodide B Sodium chloride C Ammonium iodide D Ammonium chloride

33

Which of the following will not produce a precipitate when ammonia gas is bubbled into the solution? B Aluminium chloride Potassium chloride A D Iron(II) sulfate Copper(II) nitrate C

34

Which of the following human activities does not contribute to global warming? A Deforestation B Burning of fossil fuels C Destruction of ozone layer D Excessive use of chlorofluorocarbons (CFCs)

35 Some students carried out an experiment to investigate the rate of dissolveing indigestion tablets in water at different temperatures. The following table showed the different experiments they conducted. Experiment 1 2 3 4

Size of Tablet Whole Crushed Whole Crushed

Mass of Tablet 4g 4g 2g 4g

Temperature of Water /oC 25 25 25 40

Which two experiments should be compared in order to show the effect of temperature on the rate of dissolving? A Experiments 1 and 2 B Experiments 1 and 4 C Experiments 2 and 3 ___________________________________________________________________________ 5116 / 01 / S4 Prelim / CGS / 2009

11 D 36

Experiments 2 and 4

The reaction between the hydrocarbon CxH6 and chlorine can be represented by the 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 Use A Bitumen Fuel for cars B Lubricating oil For making waxes and polishes C Paraffin (kerosene) For making roads D Petrol (gasoline) Fuel for aircrafts

38

Polyethenol is a water-soluble plastic. The diagram below shows part of the structure of polyethenol. OH

H

OH

H

OH

H

C

C

C

C

C

C

H

H

H

H

H

H

Which of the following is a possible monomer for polyethenol? A H

C

OH

H

OH

H

C

C

C

C

H

H

H

OH

OH

H

OH

OH

C

C

C

C

H

H

H

H

B H

H

D

H

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39

The diagram shows a compound X. How can X be classified as? H

O

H C

C

H

O

H C

C

H C

O

H

C

H

O H

A B C D

40

As an alkene and as an alcohol As an alkene and as an acid As an alcohol and as an alkane As an alcohol and as an acid

Wine can deteriorate after a period of time because of atmospheric oxidation. Which chemical formula shows the compound formed by the oxidation of the alcohol in wine? A C

1. D D

B D

C2H6O C3H6O

2. D A

3. C A

4. C A

5. A C

C2H4O2 C3H6O2

6. A C

7. C C

8. B D

9. D B

10. A C

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