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WorksheetsScience Quiz on Reactions and Properties
Total questions: 50
Worksheet time: 25mins
A student observes that when an iron nail is placed in copper sulfate solution, the solution changes from blue to green. What is the most likely reason for this color change?
Formation of iron sulfate
Formation of copper oxide
Evaporation of water
Decomposition of copper sulfate
Which of these metals can displace zinc from zinc sulfate solution?
Copper
Silver
Magnesium
Gold
When preparing copper chloride by reacting copper carbonate with hydrochloric acid, what observation indicates the reaction is complete?
The solution turns blue
Bubbling stops
A white precipitate forms
The temperature decreases
The diagram shows two beakers: Beaker 1: Zinc in copper sulfate solution Beaker 2: Copper in zinc sulfate solution Which beaker will show a reaction?
Only Beaker 1
Only Beaker 2
Both beakers
Neither beaker
What is the correct word equation for the reaction between magnesium and sulfuric acid?
Magnesium + sulfuric acid → magnesium sulfate + hydrogen
Magnesium + sulfuric acid → magnesium oxide + sulfur dioxide
Magnesium + sulfuric acid → magnesium sulfide + water
Magnesium + sulfuric acid → magnesium hydroxide + hydrogen
A student filters a mixture of sand and salt solution. What is collected in the filter paper?
Pure salt
Sand and salt
Pure sand
Salt solution
Which of these is NOT needed when preparing a salt by crystallization?
Bunsen burner
Filter paper
Measuring cylinder
Funnel
The table shows reactivity of four metals: Metal Reaction with water P Violent Q Slow R None S Moderate Which metal would displace iron from iron oxide?
Only P
P and S
Q and R
All four
What happens when silver is added to copper nitrate solution?
The silver dissolves
Copper metal forms
The solution turns yellow
No visible change
Which salt preparation method would be suitable for making copper sulfate from copper oxide and sulfuric acid?
Titration
Filtration and evaporation
Distillation
Chromatography
An object has a mass of 50g and volume of 10cm³. What is its density?
0.2 g/cm³
5 g/cm³
60 g/cm³
500 g/cm³
Why does an ice cube float in water?
Ice has lower density than water
Ice absorbs air bubbles
Water expands when frozen
The surface tension of water supports it
The diagram shows three liquids in a density column: Top layer: 0.8 g/cm³ Middle layer: 1.0 g/cm³ Bottom layer: 1.2 g/cm³ Where would a substance with density 0.9 g/cm³ settle?
Above the top layer
Between top and middle
Between middle and bottom
Below bottom layer
Two blocks have the same mass but different volumes. Which statement is correct?
The larger block is less dense
The smaller block is less dense
Both have same density
Density cannot be compared
Which of these would float in a liquid with density 1.5 g/cm³?
2.0 g/cm³ object
1.5 g/cm³ object
1.0 g/cm³ object
None would float
In a parallel circuit with three bulbs, what happens when one bulb is removed?
All bulbs go out
The other two stay lit
The battery drains faster
The remaining bulbs get brighter
Which instrument measures electric current?
Voltmeter
Ammeter
Ohmmeter
Galvanometer
The circuit has a 6V battery and 2Ω resistor. What is the current?
0.33A
3A
8A
12A
The diagram shows a circuit with: 2 cells in series 2 bulbs in parallel 1 switch What happens when the switch is closed?
Bulbs glow dimmer than with 1 cell
Only one bulb lights up
Both bulbs light at normal brightness
Bulbs glow brighter than with 1 cell
Which factor does NOT affect a wire's resistance?
Length
Thickness
Color
Material
What is the main difference between heat and temperature?
Heat is energy, temperature is measurement
Temperature is energy, heat is measurement
They are the same
Heat depends on volume
Why does a metal spoon feel colder than a wooden spoon at room temperature?
Metal conducts heat better
Wood absorbs more heat
Metal is always colder
Wood reflects heat
Which process transfers heat through fluids?
Conduction
Convection
Radiation
Insulation
What causes sea breezes during the day?
Land heats faster than water
Water heats faster than land
Air pressure changes
Ocean currents reverse
Why does sweating cool the body?
Water absorbs heat to evaporate
Sweat is naturally cold
Pores open wider
Blood flow increases
A light ray strikes a mirror at 40° angle. What is the angle of reflection?
0°
40°
50°
90°
When light passes from air to glass, it:
Bends toward the normal
Bends away from normal
Travels straight
Changes color
Which color refracts most when white light passes through a prism?
Red
Green
Blue
Yellow
What type of image is formed by a plane mirror?
Real and inverted
Virtual and upright
Magnified
Always colored
Which part of the brain controls balance?
Cerebrum
Cerebellum
Medulla
Hypothalamus
The right cerebral hemisphere controls:
Right side of body
Left side of body
Both sides equally
Only limbs
What carries nerve impulses?
Blood cells
Neurons
Hormones
Muscles
Which sequence shows the correct nerve pathway?
Brain → receptor → effector
Receptor → brain → effector
Effector → brain → receptor
Receptor → effector → brain
What protects the brain?
Skull and meninges
Spinal fluid only
Muscles
Cartilage
Which metal reacts violently with water?
Copper
Iron
Sodium
Silver
What gas is produced when acids react with metals?
Oxygen
Hydrogen
Nitrogen
Carbon dioxide
Which salt is made from nitric acid?
Sulfates
Chlorides
Nitrates
Carbonates
Why is crystallization better than simple evaporation for making pure salt?
Forms larger crystals
Removes all water
Produces purer crystals
Is faster
An object sinks in liquid X but floats in liquid Y. Which statement is true?
X is denser than Y
Y is denser than X
Both have same density
Cannot determine
What happens to density if volume increases but mass stays same?
Increases
Decreases
Stays same
Becomes zero
Which circuit has the same current throughout?
Series
Parallel
Both
Neither
Adding resistors in series:
Decreases total resistance
Increases total resistance
No effect
Makes current zero
Which is the best heat insulator?
Copper
Aluminum
Wood
Iron
Heat from the Sun reaches Earth by:
Conduction
Convection
Radiation
All three
Which surface absorbs most infrared radiation?
Shiny white
Dull black
Polished silver
Transparent
The blind spot in the eye lacks:
Cones
Rods
Both rods and cones
Lens
Which is NOT a reflex action?
Blinking at bright light
Pulling hand from hot object
Solving math problem
Sneezing
In the reaction: Pb + CuSO₄ → PbSO₄ + Cu, which metal is more reactive?
Lead
Copper
Both equal
Cannot tell
Which process separates salt from rock salt?
Filtration then evaporation
Distillation
Chromatography
Decanting
A 20g object displaces 5cm³ water. Will it float?
Yes, density water
Depends on shape
Needs more data
