Std6 Science Test 1

Heat from the sun reaches the earth through _______________________.
1. conduction
2. convection
3. radiation
4. bumping molecules
Most solids are good conductors of heat because _________________________________.
1. they are made up of large molecules
2. their molecules are packed very close together
3. their molecules are far apart
4. they are all metals
Convection of heat can take place in ____________________________________.
1. in liquids and gases
2. only in solids
3. only in liquids
4. only in gases
An instrument that can be used to look over other people’s heads is called a __________________________________.
1. telescope
2. microscope
3. stetheoscope
4. periscope
When something is placed in front of a plane (flat) mirror __________________________________.
1. a virtual image is formed in front of the mirror
2. a virtual image is formed behind the mirror
3. a real image is formed behind the mirror
4. a real image is formed in front of the mirror
Sound waves will travel fastest through _______________________.
1. a vaccum
2. steel
3. air
4. water
If you list the speed of sound in air, water and steel from the fastest to the slowest, the correct order will be _________________________________.
1. air water steel
2. steel water air
3. steel air water
4. air steel water
Which of the following is a strong acid?
1. citric acid
2. lactic acid
3. sulphuric acid
4. carbonic acid
____________________ paper turns blue when added to an alkali and stay red when added to an acid.
1. Blue litmus
2. Red litmus
3. Universal indicator
4. Khakhi
When a drop of liquid is put on red litmus paper, there is no colour change. This shows that the liquid _______________________.
1. is an acid
2. is an alkali
3. is neutral
4. could be an acid
Why should objects be streamlined?
1. To make them move slower
2. To use more fuel
3. To make them move faster
4. To be lighter
Which diagram shows a second class lever?
A mirage occurs because ______________________.
1. There is water on the ground
2. Light from the sky is refracted by layers of the hot and cool air
3. Light from the sky is reflected by layers of hot and cool air
4. The ground is hot.
Which organism is likely to be present in large numbers in a food chain?
1. Grass
2. Grasshopper
3. Lizard
4. Eagle
Sheet lightning _______________________.
1. ﬂashes between clouds.
2. does not make a noise
3. pass from a cloud to the earth.
4. will not occur when it is raining
What is a saturated solution?
1. Sweet solution that does not need any more solute.
2. A bitter solution
3. A watery solution
4. A clear solution
Pneumatic tyres were invented by ________________________.
1. Edison
2. Michelin
3. Marie Cure
4. Lise Meitner
Global warming may cause ________________________________.
1. a fall in sea levels
2. lower average yearly temperatures
3. flooding in low lying areas
4. decreased formation of deserts
A fine powder is mixed with water and shaken well. The mixture looks milky. It is called a __________________________.
1. solution
2. suspension
3. mixture
4. solvent
Green plants convert the sun’s energy into energy.
1. chemical
2. heat
3. electrical
4. light