Std7 Science Exam 2018

Which of the following diseases is associated with HIV/AIDS?
1. Tuberculosis
2. Diabetes
3. Cholera
4. Anaemia
The table below shows the properties of water in different states.

Which letters represent ice and steam?
1. A
2. B
3. C
4. D
A student placed his hand below a flame as shown in the diagram below.

How would heat from the ﬂame reach the hand?
1. By radiation
2. By convection
3. By convection and radiation
4. By conduction and convection
Which of the following is not necessary for seeds to germinate?
1. Air
2. Soil
3. Temperature
4. Water
Which diagram represents the house which will be coolest on a hot day?
1. A
2. B
3. C
4. D
A purple crystal of potassium permanganate is placed in a beaker filled with water. The beaker is then heated as shown below. After heating the beaker for some time, the water turned purple.

Which process caused the water to turn purple?
1. Conduction
2. Convection
3. Evaporation
4. Radiation
Which metal is matched with its use?
1. A
2. B
3. C
4. D
A student adds a large amount of sugar crystals in a small amount of water and stirs. Some crystals did not dissolve even after stirring for a long time.

What is the term used to describe this condition?
1. Dissolving
2. Melting
3. Saturation
4. Suspension
The set-up below shows two identical balloons X and Y connected to ﬂasks.

The set-up is left in the open on a sunny day for some time.

What observation will be made about the balloons?
1. Both balloons will become smaller.
2. Balloon X will become bigger than balloon Y.
3. Balloon Y will become bigger than balloon X.
4. Both balloons will increase to the same size.
Which of the following gases is a compound?
1. A
2. B
3. C
4. D
Magnesium oxide is formed when magnesium burns in the presence of oxygen.

What is magnesium oxide and oxygen in this chemical reaction?
1. A
2. B
3. C
4. D
Which of the following processes will occur at any temperature?
1. Boiling
2. Evaporation
3. Freezing
4. Melting
Which of the following objects is artificial and luminous?
1. Lamp
2. Mirror
3. Moon
4. Sun
A lizard eats worms from a tree.

Which of the following terms describes the tree?
1. Consumer
2. Community
3. Decomposer
4. Habitat
Which letter represents a producer in the food web below?
1. A
2. B
3. C
4. D
Which of the following can a student use to prepare a salt solution faster?
1. Fine salt and cold water
2. Fine salt and warm water
3. Coarse salt and cold water
4. Coarse salt and warm water
A farmer was walking in a ﬁeld and some weeds got stuck onto his trousers.

Through which mode of dispersal are the weeds spread?
1. Animal
2. Self
3. Water
4. Wind
Two identical plants X and Y were kept in two different places and watered.
Plant X was kept in a dark room. Plant Y was kept outside in an open space. After some time plant Y had grown taller than plant X.

Which of the following explains why plant Y grew taller than plant X.
1. Plant X did not receive carbon dioxide.
2. Plant X did not absorb water.
3. Plant Y absorbed oxygen.
4. Plant Y received sunlight.
Which of the following is a characteristic of a scavenger?
1. It feeds on plants.
2. It kills its own prey.
3. It produces its own food.
4. It feeds on leftover meat.
The diagram below represents part of the solar system.

What are the names of solar bodies labelled X and Y
1. A
2. B
3. C
4. D
Which of the following are characteristics of a frog?
1. A
2. B
3. C
4. D
The diagram below shows different positions of the Moon rotating around the Earth.

On which day will the Moon be brightest when seen from the Earth?
1. Day 1
2. Day 7
3. Day 14
4. Day 21
A student observed that bottled water easily forms lather with soap compared to tap water.

What is the correct classification of bottled water and tap water?
1. A
2. B
3. C
4. D
Which of the following changes occurs in boys during puberty?
1. Widening of the hips
2. Developing of breasts
3. Deepening of the voice
4. Starting of menstruation
The diagram below shows the water cycle.

Which processes occur at X and at Y?
1. A
2. B
3. C
4. D
Which of the following instruments is used to measure force?
1. A
2. B
3. C
4. D
The diagram below shows a compass with its needle pointing towards a certain direction.

The compass is replaced by a bar magnet hanging on a thread.

Which diagram below shows how the magnet will come to rest?
1. A
2. B
3. C
4. D
Which of the following objects cannot be attracted by a magnet?
1. Connecting wire
2. Money clip
3. Spade
4. Staples
Which characteristic of a plant protects it from being easily eaten by animals?
1. Deep roots
2. Bright colour
3. Small leaves
4. Sharp thorns
In which of the following circuits will the bulbs be brightest?
1. A
2. B
3. C
4. D
In which of the following set-ups will static electricity be produced?
1. A
2. B
3. C
4. D
Which part of the digestive system below is not a passage for food?
1. A
2. B
3. C
4. D
A family eats a lot of fatty and sugary foods most of the time.

Which of the following conditions are they likely to develop?
1. Anaemia
2. Goitre
3. Marasmus
4. Obesity
The diagram below shows a swelling on the neck of a person caused by lack of a certain food nutrient in the body.

Which nutrient does the body lack?
1. Carbohydrates
2. iodine
3. lron
4. Protein
The bar graph below shows the number of cases related to problems affecting people who abuse alcohol.

Which problem is most common amongst people who abuse alcohol?
1. Rape
2. Fights
3. STI infections
4. Teenage pregnancy
Which of the following objects is a lever?
1. A
2. B
3. C
4. D
In Botswana, electricity is generated from burning coal.

Which environmental problem does this cause?
1. Soil erosion
2. Earthquake
3. Deforestation
4. Global warming
A magnet labelled at points W. X and Y was brought near iron pins as shown below

Which diagram shows how the pins will be attracted to the magnet?
1. A
2. B
3. C
4. D
Two people are sitting next to each other in a room.

Which of the following diseases can they contract from one another?
1. Bilharzia
2. Inﬂuenza
3. Malaria
4. Syphillis
Which of the following practices can lead a person to contract HIV/AIDS?
1. Eating an unbalanced diet
2. Sharing clothes with friends
3. Shaking hands with strangers
4. Having unprotected sexual intercourse
A wire is coiled around an iron nail. The wire is then connected to a cell and a switch as shown below.

What will happen to the nail when the switch is closed?
1. It will be magnetised.
2. It will become cold.
3. It will shine.
4. it will melt.
The diagram below shows the female reproductive system.

Which of the following processes occurs at P?
1. Ejaculation
2. Fertilisation
3. Implantation
4. Ovulation
Which pair of diseases is correctly classiﬁed in the table below?
1. A
2. B
3. C
4. D
The picture below shows an immunisation schedule.

Which vaccine is not given to children who are less than one year old?
1. DPT
2. DT
3. Measles
4. Polio
The diagram below shows the correct way of storing magnets.

Which of the following substances cannot be used to replace material X?
1. Wood
2. Steel
3. Plastic
4. Aluminium
A liquid spilled from a bottle onto a cloth and created little holes on the cloth.

Which of the following safety symbols should show on the bottle?
1. A
2. B
3. C
4. D
Which electromagnet will attract few steel pins when the switch is closed?
1. A
2. B
3. C
4. D
The diagram below shows a ﬂying aeroplane.

What is the name of force P?
1. Friction force
2. Magnetic force
3. Electrostatic force
4. Gravitational force
The diagram below shows a stage of pregnancy at 8 months.

What part of the diagram is labelled Q?
1. Zygote
2. Infant
3. Foetus
4. Embryo
The diagram below shows an incomplete electric circuit.

Which material should be placed between X and Y to make the bulb light?
1. Paper
2. Rubber
3. Metal
4. Cloth
The diagram below shows a person pushing a wheelbarrow.

Which term is used to describe the force applied to push the wheelbarrow?
1. Effort
2. Load
3. Pivot
4. Weight
A classification of substances is shown below.

What do letters X and Y represent?
1. A
2. B
3. C
4. D
Which diagram below shows a proper way of disposing a used condom?
1. A
2. B
3. C
4. D
A glass is ﬁlled with ice cubes. After some time, water droplets are formed outside the glass as shown below.

Which process led to the formation of the water droplets?
1. Freezing
2. Melting
3. Evaporation
4. Condensation
A student plotted the graph below using the results collected from an experiment.

Which of the following tables of results was used to plot the graph?
1. A
2. B
3. C
4. D