Std7 Science Exam 2017

Which type of soil contains the largest particles?
1. Clay
2. Loam
3. Sandy
4. Silty
Which of the following substances is not soluble in water?
1. Alcohol
2. Flour
3. Table salt
4. Sugar
Which of the following below is a human liver?
which of the following instruments is not likely to be found at a weather station?
1. Wind vane
2. Rain gauge
3. Thermometer
4. Balance scale
Which of the following diseases is not transmitted through sexual contact?
1. Syphilis
2. Ring worm
3. Gonorrhoea
4. Genital warts
Which part of the eye transmits messages to the brain?
1. Iris
2. Lens
3. Optic nerve
4. Ciliary muscle
Which of the following energy sources is renewable?
1. Coal
2. Paraffin
3. Petrol
4. Wind
Which of the following physical changes is common in boys and girls at puberty?
1. Hips growing wider
2. Chest becoming wider
3. Deepening of the voice
4. Hair growing under the armpit
A schoolhad an outbreak of a curable communicable disease.The infected students were asked to stay away from schooluntil they have healed.

Why was it important for the students to stay away from school.
1. To reduce the spread of the disease at school
2. To take medication easily at Home
3. To have regular meals at Home
4. To avoid sleeping at school
What does the circuit below represent?
1. Cell
2. Switch
3. Electric bulb
4. Connecting Wire
Which of the following gases is the largest component in clean air?
1. Oxygen
2. Nitrogen
3. Water Vapour
4. Carbon Dioxide
A person who is taking care of a patient was advised to do the following to reduce the risk of being infected by the disease?
.Wash hands regularly
.Spend less time with the patient
.Wear a mask to cover the mouth and the nose

Which of the following diseases is the patient likely to be suffering from?
1. Cholera
2. Gonorrhoea
3. Polio
4. Turberculosis
Which force acts downwards on a book placed on top of a table?
1. Friction
2. Gravity
3. Tension
4. Air resistance
A baker cold water to a mixture of flour,sugar,fine salt and yeast to make dough.The dough took a long time to rise.
Which of the following could have been done to make the dough rise faster?
1. Using coarse salt
2. using warm water
3. Increasing the amount of flour
4. Reducing the amount of sugar
A patient consulted a traditional doctor for heslinh
The doctor made a cut on the patient using a used razor blade?
What should have the doctor done to reduce the patient's risk of containing other diseases?
1. Rinse the razor blade with traditional medicine
2. Wipe the razor blade with cloth
3. Use a new razor blade
4. Oil the razor blade
Thobo noticed some water droplets on the leaves of a plant in the morning.Later during the day,the water dropplets has dissapeared from the leaves.

Which process could have made the water droplets to dissapear?
1. Condensation
2. Evaporation
3. Freezing
4. Melting
When lifting an object ,a student applied a substance on their hands to increase friction between the object and the hands.
Which of the following substance is likely to have been applied?
1. Lotion
2. Oil
3. Powder
4. Water
The diagram below shows the male reproductive system.Which part produces sperms?
1. A
2. B
3. C
4. D
Which of the following careers does not involve the application of asacience?
1. Accounting
2. Engineering
3. Mining
4. Nursing
Which of the following is a scientific invention?
1. Bulb
2. Sea
3. Sun
4. Tree
Which of the following is not a weather condition?
1. Darkness
2. Hotness
3. Mist
4. Rain
What type of a simple machine is a bicycle?
1. Lever
2. Wedge
3. Inclined plane
4. Wheel and axle
Which of the followingdomestic activities should be discontinued in order to con more water?
1. Bathing
2. Cooking
3. Drinking
4. Watering
During a hot day,light rays from the Sun produce a shiny image on the ground.
Which term describes this natural event?
1. Mirage
2. Opaque
3. Reflection
4. Refraction
Which form of energy comes from the sun?
1. Chemical
2. Gravitational
3. Kinetic
4. Solar
What is the period of time when the earth makes a complete rotation about its axis?
1. Day
2. Hour
3. Week
4. Year
Which of the following is the best method for preventing teenage pregnancy?
1. Abstinence
2. Diaphragm
3. Condom
4. IUD
What does the road sign below warn motorists of?
1. Sharp curve
2. Narrow road
3. Slippery road
4. Flowing stream
Which of the following is a Reflex action?
1. Sneezing
2. Smiling
3. Dancing
4. Chewing
Which of the following deficiency diseases can be prevented by eating green vegetables?
1. Kwashiokor
2. Marasmus
3. Obesity
4. Rickets
Which of the following is true about contagious diseases?
1. They are caused by poor hygiene
2. They are spread through insect bite
3. They are caused by lack of nutrients in the body
4. They are spread through direct contact with infected people
Use the information and table belowto answer questions 43 and 44
One teaspoon of baking powder was added to equal amounts of different household liquids.The volume of gas produced was measured .
The table below shows the volume of gas before and after baking powder was added to each household liquid

Which of the following liquids was gas produced when baking powder was added?
1. Milk
2. Tea
3. Vinegar
4. Water
One teaspoon of baking powder was added to equal amounts of different household liquids.The volume of gas produced was measured .
The table below shows the volume of gas before and after baking powder was added to each household liquid

Baking powder reacts with acids only.Maatla used a blue litmus paper and a red litmus paper to test the acidity of milk,water ,vinegar and lemon juice.
Which of the following observations did Maatla make?
1. Blue litmus paper turning red in lemon juice
2. Red litmus paper turning blue in vinegar
3. Red litmus paper turning blue in water
4. Blue litmus paper turning red in milk
A small container is filled up with substance X
The substance is then transferred into a larger container and fills it up.

Which of the following statements explains why substance X filled up the larger container?
1. The size of its particles increased
2. The speed of its particles increased
3. The number of its particles increased
4. The space between its particles increased
Which of the following is a sign of alcohol addiction?
1. Having a lot of appetite
2. Gaining of weight
3. Shakiness
4. Vomiting
Tlamelo wants to test if ice melts quicker than frozen milk.
Which of the following should Tlamelo do in order to make the test fair?
1. Use equal amounts of ice and frozen milk in similar containers
2. Place small ice cubes and milk in bowls of different materials
3. Mix ice cubes with frozen milk in the same container
4. Add water on frozen milk and not on ice
Which of the following is true about the solubility of salt in water?
1. Stirring makes salt dissolve faster in water
2. Salt dissolves faster in a small amount of water
3. Salt dissolves faster in cold water than in hot water
4. Coarse salt dissolves in water faster than powdered salt
Why is it important for pregnant mothers to test for HIV/AIDS?
1. To identify those who should enroll for PMTCT
2. To provide cure at an early stage to those infected
3. To make the society to accept infected person
4. To protect their sex partners from being infected
Which term is used for water that requires a lot of soap to produce lather?
1. Hard water
2. Pure water
3. Dirty water
4. Soft water
A student accidentally stepped on a pin and quickly pulled away his leg.
Which order did electrical messages to the student 's leg follow?
Which of the weather instruments below is used to measure the amount of rainfall?
Which symbol represents the element calcium?
1. C
2. Ca
3. Cl
4. Cu
Which of the following birds is adapted to picking food with its feet
The diagram below shows an ecosystem of a small pond
Which of the organism obtains its energy directly from the sun?
1. Fish
2. Frog
3. Tadpole
4. Water plant
Diagram P below shows the spread of two plants along a river bank.
Diagram Q shows the spread of the same plants after some years

What is the most likely method of seed dispersal for plant S?
1. Self
2. Wind
3. Water
4. Animal
The diagram below shows a copper lightining conductor placed next to a house

Why would the conductor fail to protect the house from lightining?
1. It is not placed on top of the roof
2. It is not attached to the house
3. It is shorter than the house
4. it has spikes
A student made a switch using an insulating material and three conductors,W,X and Y. He connected the switch to a circuit as shown in the diagram below and the bulb did not light.
What change can be made to make the bulb light?
1. Move the sliding metal to W
2. Increase the number of cells
3. Connect the wire to Y instead of X
4. Replace conductor X with an insulator
Which types of materials are more suitable for making the body and the handles of a cooking pot
1. A
2. B
3. C
4. D
The diagram below shows two magnets keepers and storage key
Which material is used to make the magnet keepers?
1. Copper
2. Iron
3. Plastic
4. Wood
The diagram below shows a mixture of small pieces of iron,copper and alluminium placed on top of a paper at area X
A magnet was placed under the paper where the mixture is,and it was pulled to the right so that it end up at area Y.

Which of the substance from the mixture will remain at X?
1. Iron
2. Aluminium
3. Copper and Iron
4. Copper and Alluminium
The diagram below shows a Mud house roofed with iron sheets

Through which of the following methods does heat from the sun reach the inside of the house?
1. Conduction only
2. Convection only
3. Radiation and Conduction
4. Radiation and Convection
The set-up below was used to investigate conduction of electricity by different materials.The bulb did not light when switch S was closed.

Which of the materials does not conduct electricity?
1. Connecting
2. Glass block
3. Salty water
4. Iron nails
Objects P,Q and P are made of different materials but they are of equal size and similar shape.
The diagrams below show positions P and Q when placed in liquid X and P and R when placed in liquid Y.

Which diagram shows the correct positions of the objects in the combined liquids?
Diagram P shows three bar magnets held tightly together
Diagram Q shows the positions of the three magnets after being released.The North pole and South pole of the magnets are labelled N and S

Which statement is correct about the poles of the other magnets?
1. I is a north pole
2. H is a north pole
3. H and I are like poles
4. G and J are unlike poles
The below chart is used to classify some vertebrates?

Which of the following are represented by P and Q?
1. A
2. B
3. C
4. D
A permanent magnet was brought close to a suspended metal bar. The metal bar moved away from the magnet as shown in the diagram below.
1. Making the south pole of the magnet to face the metal bar
2. Moving the magnet slowly towards the metal bar
3. Using a stronger magnet
4. Oiling the metal bar
The information below describes the feeding level of organism in a food web.
L is a producer
M and N feeds on L
P feeds on M and N
O feeds on N
Which food web represents the relationship between the organisims?
1. A
2. B
3. C
4. D
A student placed the set-up below in a refrigirator?

What is mostly likely to be observed in the set-up after a few hours?
1. The water will be colourless
2. The tube will have increased in size
3. The water level in the tube will have risen
4. The water level in the tube will have dropped
The diagrams below show set-ups P,Q,R, and S used to investigate conditions necessary for germination.

Which two set-ups can be used to demonstrate that air is needed for germination?
1. P and S
2. P and Q
3. Q and R
4. R and S
Which of the following separating techniques can be used to obtain salt from salty water?
1. Decanting
2. Evaporation
3. Filtration
4. Sedimentation