CSEC Chemistry Paper 1 January 2007 - Free CXC Past Paper with Answers

Which of the following is NOT a fundamental quantity?

The unit of electrical resistance may be expressed as

$1 \, \Omega = IV.A^{-1}$

$1 \, \Omega = IA.V$

$1 \, \Omega = IV^{-1}.A$

$1 \, \Omega = IWA^{-1}$

In which of the following groups are the four electric currents listed in order of INCREASING size?

1 μA, 1 x 10³ A, 0.01 A, 100mA

1 μA, 100mA, 0.01 A, 1 x 10³ A

1 x 10³ A, 1 μA, 100mA, 0.01 A

1 μA, 0.01 A, 1 x 10³ A, 100mA

A student was asked to express the experimental result for the density of mercury in standard form. Which of the following is the correct way of stating the result?

0.1362 x 10⁵ kgm⁻³

1.362 x 10⁴ kgm⁻³

13.62 x 10³ kgm⁻³

136.2 x 10² kgm⁻³

Which of the following is suitable for measuring the diameter of a human hair?

Micrometer screw gauge

Item 6 refers to the following diagram. 6 7 cm scale Vernier scale 0 5 10

The diagram above indicates a vernier caliper measurement of

The force which keeps the moon in orbit is

Item 8 refers to the diagram below. T₁ T₂ ◄1 cm -3 cm Y 10 N 40 N

A uniform rod XY of weight 40 N is held in equilibrium, horizontally, as shown in the diagram above. Which of the following is true?

In relation to the diagrams below, which of the following statements is/are correct?

I. Body A is in neutral equilibrium. II. Body B is in unstable equilibrium. III. Body C is in stable equilibrium.

What is the unit of the moment of a force?

The diagrams below, drawn to scale, represent two forces S and T acting at O. In which of the following is the resultant in the direction, OX?

Which of the following could be used to find the speed of an object?

Change in velocity / Time taken

Change in displacement / Time taken

Distance travelled / Time taken

Distance travelled x Time taken

Which of the following graphs represents a constant speed?

Which of the following is the unit of momentum?

The mass of a rifle is 100 times the mass of its bullet. If the recoil speed of the rifle is v, then the speed of the bullet is

Which of the following implements is/are designed to take advantage of a large moment provided by a relatively small force? I. Claw hammer II. Crowbar III. Pair of tweezers IV. Pair of wire cutters

A solid object when placed in a beaker of water just sinks to the bottom. It could be made to float by doing which of the following? I. Cutting off part of the object II. Dissolving a lot of salt in the water III. Carrying the beaker up to the top of a high mountain

The kinetic energy of a body of mass, m, and velocity, v, is

A glass marble, X, moving with a speed of 6 ms⁻¹, collides 'headon' with an identical stationary glass marble, Y. What is the velocity of Y after collision assuming that X is brought to rest?

A thermocouple may be used as a thermometer. Which of the following properties is utilised in a thermocouple?

Expansion of a metal

Expansion of two different metals

Production of electric current at a junction of two wires

Production of electric current in a heated wire

Absolute zero is the temperature at which

air changes to a liquid

a gas would exert no pressure

all substances contract to zero volume

gas molecules move at a constant speed

Items 22 refer to the following information.

In a hospital, the steam pipes hung from the ceiling in the corridor are not straight but rather have a Ubend at intervals of about 40 m, as shown in the diagram below.

The purpose of the bends in the pipe is to

trap any water in the steam

reduce the pressure of the steam

conduct heat away from the pipes

allow for expansion of the pipes

Some molten naphthalene at 100 °C is allowed to cool down at room temperature. If naphthalene has a melting point of 80°C, which of the following BEST represents the cooling curve?

The specific latent heat of vaporization of water is the energy required to change 1 kg of water at

0°C to steam at 100 °C

99.9 °C to steam at 100.1 °C

100 °C to steam at 100 °C

0 °C to ice at 0 °C

Which of the following would be responsible for the heating of the Earth by the sun?

I. Radiation II. Convection III. Conduction

Item 26 refers to the following diagram.

A styrofoam "igloo" (see diagram above) for keeping drinks cool was filled with ice in the morning. By evening, all the ice had melted. This is because it

lost heat through the walls by radiation

lost heat through the walls by conduction

gained heat through the walls by radiation

gained heat through the walls by conduction

Plane water waves travel from deep water to shallow water with an angle of incidence of 0º as shown in the diagram above. Which of the following would be true?

Which of the following graphs relates the volume of a gas to its Celsius temperature if the mass of gas and pressure remain constant?

A pencil point is dipped into water at Point P in front of a straight barrier. The REFLECTED wave will look like

When a special whistle is blown, dogs can hear the signal but people cannot. Which of the following could be the frequency of the waves emitted by the whistle? I. 1 500 Hz II. 15 000 Hz III. 25 000 Hz

Compared with X-rays, radiowaves

have a longer wavelength

have a higher frequency

travel faster in air

pass through a sheet of steel more easily

The sharp edges of shadows suggest that light

travels in straight lines

travels very quickly

Which of the following are true of the image produced by a plane mirror? I. It is enlarged. II. It is erect. III. It is vertical.

The light ray shown in the diagram above is incident at the air-glass interface at an angle of incidence of 50°. If the critical angle for glass is 45°, the light ray will be

For which of the following object distances will a convex lens of focal length 18 cm produce a real image? I. 15 cm II. 36 cm III. 54 cm

Which of the ray diagrams shown above are correct?

Item 37 refers to the following diagram.

The diagram above shows a small negatively charged dust particle midway between two plates and observed with a microscope. Which of the following arrows correctly indicates the path taken by the dust particle when the switch S is closed?

Which of the following equations is NOT correct?

$1 C = 1 A \times 1 s$

$1 V = 1 A \times 1 \Omega$

$1 J = 1 A \times 1 \Omega$

$1 W = 1 V \times 1 C$

Which of the following formulae (in which the symbols have their usual meaning) is a mathematical expression of Ohm's Law?

Which of the following is a representation of the current versus p.d. relationship for a metallic conductor at a constant temperature?

In domestic installation systems, which of the following should be placed in the live wire? I. Switches II. Circuit breakers III. Fuses

Item 42 refers to the following diagram.

Which of the following is correct?

Q is carbon, R is zinc.

P is copper oxide, Q is carbon.

R is iron and S is ammonium chloride.

S is sulphuric acid and P is manganese dioxide.

A simple experiment was conducted using the circuit diagrams shown above. The same components were used and the bulb was lit to normal brightness in each case.

Which of the following statements would be correct? I. The bulb is defective. II. The battery is defective. III. The diode is defective.

Which of the following pairs of statements is true for both iron and steel?

Iron is easily magnetised Steel does not retain magnetism

not easily magnetised retains its magnetism well

easily magnetised retains its magnetism well

not easily magnetised does not retain its magnetism

Item 46 refers to the diagrams below showing the magnetic field lines plotted by a student.

Which of the following are correct?

Which of the following is MOST suitable for the core of an electromagnet?

A glass rod is rubbed with a piece of silk and is positively charged. The glass rod became charged by

Which of the following make use of the magnetic field generated by an electric current?

I. d.c. motor II. Moving III. Electric iron

It is possible to induce a voltage in a wire coil by the use of a

steady magnetic field

positively charged rod

negatively charged rod

changing magnetic field

For a simple a.c. generator, which of the following graphs will be produced by two complete rotations of the armature?

The electric power supplied to homes and to factories is alternating rather than direct because

the use of a.c. reduces electrical hazards

the use of a.c. reduces transmission losses

a.c. enables a wider variety of appliances to be used

a.c. power lines are less likely to be struck by lightning than d.c. power lines

Item 53 refers to the following diagram of a simple a.c. generator.

The parts labelled X in the diagram are known as the

Item 54 refers to the following diagram.

Which of the following does the diagram above represent?

Appropriate labels for W and X would be

step-down transformer / a.c. input

step-down transformer / d.c. input

step-up transformer / a.c. input

step-up transformer / d.c. input

Which of the following is an isotope of X?

Which of the following statements may be used to define the term “half-life”? I. It is half the time required by a nucleus to decay. II. It is the time for half of the nuclei of a sample to decay. III. It is the time for the activity of any random process to fall to one half of its original value.

When alpha particles, beta particles and gamma rays from a radioactive source are subjected to a transverse magnetic field, which of them would NOT be deviated from their original path? I. Alpha II. Beta III. Gamma

An isotope of uranium, $^{234}_{92}$ U, changes to $^{230}_{90}$ Th. This is an example of

In the equation $\Delta E = \Delta mc^2$

$c$ =speed of light, $\Delta m$ =mass of atom

$c$ = specific heat capacity of substance, $\Delta m$ =mass of substance

$c$ = specific heat capacity of substance, $\Delta m$ =mass lost

$c$ =speed of light, $\Delta m$ =mass lost

CSEC Chemistry Paper 1 January 2007 - Free CXC Past Paper with Answers

CSEC Chemistry Paper 1 January 2007 Questions