BECE JHS Integrated Science 2019 Past Questions

Steel is an alloy of iron and

(a) In an experiment, the surfaces of three iron nails were cleaned dry and placed in three separate test tubes A, B and C as shown in the diagram.
INSERT i2019b1a
Study the diagram carefully and answer the questions that follow

After three days the nail in test tube A was found to have rusted while the nail in test tubes B and C did not rust.

(i) Suggest and aim for the experiment.
(ii) Why was the water in test tube B boiled?
(iii) State the function of the oil on top of the water in test tube B.
(iv) What is the purpose of the calcium chloride in test tube C?
(v) Why did the nail in Test A rust?
(vi) Why did the nail in test tube
(\alpha) B did not rust?
(\beta) C did not rust?
(vii) From the experiment, explain why oil is applied on the surface of a metal to prevent rusting.

(b) In an experiment, the following activities were carried out on two green leaves A and B. Leaf A was taken from a plant placed in the sunlight for some time while leaf V was taken from a plant placed in a dark cupboard for 24 hours.

Activity.
I.Leaves dipped in boiling water for 1 minute
II. Leaves dipped in warm alcohol
III. Leaves washed in cold water
IV. Leaves dipped in iodine solution

After dipping in the iodine solution, it was observed that leaf A changed colour. Study the activities carefully and answer the questions that follow.
(i) Suggest an aim for the experiment.
(ii) Explain briefly why each of the following activities were carried out:
(\alpha)I
(\beta)II
(\gamma) III
(iii) State the colour change of leaf A.
(iv) Explain why leaf A changed colour?
(v) Why is it necessary to de-starch the plant before starting the experiment?
(vi)From the above experiment, what conclusions(s) can be drawn.

(c) You are provided with two dry soil samples A and B, a measuring cylinder, beakers, funnels, filter paper, beam balance, stop watch and water.
With the aid of a labelled diagram, describe an experiment to find out which of the two soil samples can hold more water.

(d) The diagram below is an illustration of an experiment that was carried out. In the experiment three pins 1, 2 and 3 were fixed with candle wax onto a metal bar and one end of the bar was heated by means of boiling water. A, B and C are the thermometers inserted in holes along the bar to measure the temperatures at the various points.
Study the diagram carefully and answer the questions that follow.
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(i) Suggest an aim for the experiment?
(ii) What is the temperature of the boiling water?
(iii) State the observations that would be made about the pins 1, 2 and 3.
(iv) State the observations that would be made about the temperatures
Recorded by the thermometers A, B and C.
(v) State how heat from the sun is transmitted to the earth.

An atom that has lost one or more electron(s) is called

(a) (i) What is food chain?
(ii) Why is the plant in any food chain referred to as the producer?
(iii) What is the term given to the other organisms that depend directly or
indirectly on the producers for food.

(b) The diagram below is an illustration of the picture obtained on a screen when an opaque object is placed in the path of a light source.
Study the diagram and answer the questions that follow.
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(i) Name each of the shadows that is cast on the screen;
(α) A;
(β) B

(ii) What does the shadow of the object cast on the screen illustrate?

(c) Describe briefly how a sample of pure sugar could be obtained from a mixture of sugar and sand.

(d) State three ways by which soil can be conserved.

In all machines, the efficiency is

(a) A body of mass 100 kg is raised to a height of 2m above the ground.
(i) State the name of the energy possessed by the object by reason of its new position.

(ii) Calculate value of this energy.
[g=10 ms-2]

(b) (i) What is matter?
(ii) State two of the states of matter.

(c) (i) Describe the nature of loamy soil.
(ii) Name any two plant nutrients.

(d) (i) State one causative organism for each of the following diseases:
(\alpha) cholera ;
(\beta) tuberculosis.

(ii) State one method of prevention of cholera.

In electronic circuits, LEDs are used to indicate the absence or presence of

(a) Explain briefly why a tomato plant is likely to wilt if too much fertilizer is applied.
(b) State the dangers involved in each of the following activities in the laboratory:
(i) eating or drinking water in the laboratory.
(ii) Walking barefooted;
(iii) washing hands with unknown liquid in a beaker.

(c) A child is found not to be able to see at night.
(i) what deficiency disease may the child be suffering from?
(ii) what food nutrient is the child lacking?
(iii) State three sources of food substances that can provide the nutrient that child lacks.

(d) (i) What is a force?
(ii) Explain briefly why a driver a could not stop a car on a slippery section of a road when he applied the brake.

Which of the following statements about the scientific method is/ are correct? It provides
I. logical procedure for arriving at knowledge
II. knowledge that can be verified
III. knowledge that can never be changed

(a) Describe briefly how the volume of an irregular shaped lead ball could be measured.

(b) State three characteristics of living things.

(c) (i) what us pollution?
(ii) Name one air pollutant .

(d) State three factors which influence vegetable crop production.

Which of the following substances is a compound?

Which of the following source(s) of energy is/are renewable?
I. Solar
II. Crude oil
III. Wind

The pressure in fluids

Which of the following chemical equations is balanced?

Lime juice tastes sour because it is

A metal black has a mass of 1.0 kg. What is the volume of the block if its density is 10\ kgm^-3?

It is easier to move a heavy load with a crowbar when the load

Benedict’s solution was added to a mixture in a test tube and it turned brick red when heated. The mixture is likely to contain

Chlorine gas is an example of

Which of the following statements about a force are correct? It
I. is measured in newtons
II. is measured in newton-metre
III. can start a motion
IV. can change the direction of a moving body

Kerosene is able to reach the other end of a wick by

Which of the following processes is used to separate insoluble solids from liquids?

Which of the following chemical compounds is used in removing hardness in water?

When a thermometer is put in hot water, the mercury level rises because the mercury increases in

The workdone when a force moves a body through a distance of 12 m is 720 J. The force applied is

Which of the following compounds is neutral to litmus paper?

A balanced diet is one which is made up of

The ovule in a flower develop to form the

Water drains faster through sand than clay because

The best method of checking erosion on a slope is

The housefly is an agent for the spread of

Which of the following substances are carried by the blood?
I. Nutrients
II. Urine
III. Oxygen
IV. Carbon dioxide

Which of the following statements about a plant cell is correct? It

The study of the soil profile of an area helps the farmer to

The term leaching in soils refers to

How many stages does the mosquito go through in its life cycle of development?

Which of the following enzymes helps in the digestion of protein in the human stomach?
I. Proteases
II. Amylase
III. Lipase

Kidneys absorb water from the bloodstream humans through the process of

An example of soil macro-nutrients is

The vegetable crop that staking during its growth is

The function of the white blood cells in human is to

The carpel of a flower is made up of the following parts except

A food web shows howplants is distributed among organisms in a community

Balanced ration enables animals to

Cultural practices are activities undertaken on a farm