Knowledge Check: Natural Phenomena
Knowledge Check: Natural Phenomena
Objects and Materials
Q1: Which property helps a material sink in water?
A) Transparency
B) Density
C) Hardness
D) Solubility
Q2: Which material is a good conductor of electricity?
A) Rubber
B) Plastic
C) Copper
D) Wood
Q3: Which method separates heavier impurities from grains?
A) Sieving
B) Hand-picking
C) Filtration
D) Evaporation
Q4: Which process is used to obtain salt from seawater?
A) Filtration
B) Sedimentation
C) Evaporation
D) Sieving
Q5: Which of the following is a chemical change?
A) Melting of ice
B) Boiling of water
C) Rusting of iron
D) Breaking of glass
Q6: Which indicator turns red in acidic solution?
A) Turmeric
B) Litmus
C) Phenolphthalein
D) China Rose
Q7: Which metal is highly reactive in basic level reactivity series?
A) Gold
B) Copper
C) Sodium
D) Silver
Q8: Which of the following is an example of crystallisation?
A) Making ice
B) Making sugar crystals
C) Boiling water
D) Filtering tea
Q9: Which material allows partial light to pass?
A) Opaque
B) Transparent
C) Translucent
D) Reflective
Q10: Which prevents rusting of iron by blocking air and water?
A) Heating
B) Painting
C) Washing
D) Cutting
Measurement and Motion
Q1: Which is the standard unit of length?
A) Centimetre
B) Metre
C) Inch
D) Foot
Q2: Which instrument is used to measure time?
A) Thermometer
B) Stopwatch
C) Barometer
D) Screw gauge
Q3: A car covers 60 km in 2 hours. What is its speed?
A) 20 km/h
B) 25 km/h
C) 30 km/h
D) 40 km/h
Q4: Which type of motion is seen in a spinning top?
A) Rectilinear motion
B) Circular motion
C) Rotational motion
D) Periodic motion
Q5: The motion of a pendulum is an example of:
A) Rectilinear motion
B) Periodic motion
C) Random motion
D) Circular motion
Q6: In a distance–time graph, a horizontal line shows:
A) Uniform motion
B) Non-uniform motion
C) Object at rest
D) Increasing speed
Q7: Which unit is used to measure speed?
A) m²
B) km
C) m/s
D) kg
Q8: A train moving with constant speed shows:
A) Uniform motion
B) Periodic motion
C) Oscillatory motion
D) Rotational motion
Q9: Which measurement does a simple pendulum help to understand?
A) Length
B) Speed
C) Time
D) Mass
Q10: Which of these is a non-standard unit of measurement?
A) Metre
B) Kilogram
C) Handspan
D) Second
Light, Shadows and Reflection
Q1: Which of the following is a natural source of light?
A) Tube light
B) Electric bulb
C) Sun
D) Torch
Q2: Which type of object allows all light to pass through?
A) Opaque
B) Translucent
C) Transparent
D) Reflective
Q3: Which object forms a clear shadow?
A) Transparent object
B) Translucent object
C) Opaque object
D) Glass sheet
Q4: What type of image is formed by a plane mirror?
A) Real and inverted
B) Virtual and erect
C) Enlarged and inverted
D) Diminished and real
Q5: Which instrument is used to see around corners?
A) Kaleidoscope
B) Periscope
C) Telescope
D) Microscope
Q6: In a pinhole camera, the image formed is:
A) Erect and real
B) Inverted and real
C) Virtual and erect
D) Enlarged and real
Q7: Which mirror is used as a rear-view mirror in vehicles?
A) Concave mirror
B) Convex mirror
C) Plane mirror
D) Cylindrical mirror
Q8: What causes the formation of a rainbow?
A) Reflection only
B) Refraction and dispersion
C) Absorption of light
D) Blocking of light
Q9: Which part of the human eye controls the amount of light entering the eye?
A) Retina
B) Pupil
C) Cornea
D) Optic nerve
Q10: Which system is useful for reading by visually challenged people?
A) Sign language
B) Morse code
C) Braille
D) Semaphore
Electricity and Circuits
Q1: Which component supplies electrical energy in a circuit?
A) Switch
B) Bulb
C) Cell
D) Wire
Q2: Which material is a good conductor of electricity?
A) Plastic
B) Rubber
C) Copper
D) Wood
Q3: What happens when a switch is in OFF position?
A) Circuit is complete
B) Current flows
C) Circuit is broken
D) Bulb glows brighter
Q4: What is the symbol for a cell in a circuit diagram?
A) Two parallel lines of different lengths
B) Zig-zag line
C) Circle with a cross
D) Triangle
Q5: Which device is used to break the circuit during overload?
A) Battery
B) Fuse
C) Bulb
D) Switch
Q6: Which effect of electric current is used in an electric heater?
A) Magnetic effect
B) Heating effect
C) Chemical effect
D) Sound effect
Q7: Which of the following is an insulator?
A) Aluminium
B) Glass
C) Iron
D) Copper
Q8: Which part of an electric bulb glows when electricity passes?
A) Glass cover
B) Filament
C) Base
D) Insulation layer
Q9: Which effect of current is used in an electric bell?
A) Heating effect
B) Magnetic effect
C) Chemical effect
D) Light effect
Q10: Why is earthing used in electric devices?
A) To increase current flow
B) To protect from electric shock
C) To make devices work faster
D) To save electricity
Magnetism
Q1: Which material is attracted by a magnet?
A) Wood
B) Plastic
C) Iron
D) Glass
Q2: What happens when like poles of two magnets are brought close?
A) They attract each other
B) They repel each other
C) They disappear
D) They stick permanently
Q3: Which device uses a magnet to show directions?
A) Microphone
B) Compass
C) Thermometer
D) Barometer
Q4: Which pole of a magnet points towards the North direction?
A) South pole
B) North pole
C) West pole
D) East pole
Q5: What is the effect of heating a magnet strongly?
A) Increases magnetism
B) Decreases magnetism
C) Changes color
D) Makes it heavier
Q6: Which method is used to make an iron bar a magnet?
A) By bending it
B) By hammering randomly
C) By stroking it in one direction with a magnet
D) By cooling it in water
Q7: Which of these is a non-magnetic material?
A) Nickel
B) Cobalt
C) Aluminium
D) Iron
Q8: Why are magnets stored with keepers?
A) To increase weight
B) To avoid rust
C) To prevent loss of magnetism
D) To decorate them
Q9: A freely suspended magnet always settles in which direction?
A) East-West
B) North-South
C) Up-Down
D) Random
Q10: Which law of magnetism is correct?
A) Like poles attract
B) Like poles repel
C) All poles attract
D) Magnets only attract, never repel
Heat and Temperature
Q1: Which instrument is used to measure body temperature?
A) Clinical thermometer
B) Laboratory thermometer
C) Barometer
D) Hygrometer
Q2: Which unit is commonly used to measure temperature in meteorology?
A) Kelvin
B) Watt
C) Celsius
D) Joule
Q3: Which mode of heat transfer does not require a medium?
A) Conduction
B) Convection
C) Radiation
D) Diffusion
Q4: Which material is a bad conductor of heat?
A) Copper
B) Iron
C) Wood
D) Aluminium
Q5: Why are cooking utensils usually made of metals?
A) They are light in weight
B) They are good conductors of heat
C) They are cheap
D) They do not melt
Q6: Which device prevents heat loss or gain?
A) Oven
B) Pressure cooker
C) Thermos flask
D) Heater
Q7: Land breeze blows during:
A) Day time
B) Night time
C) Noon
D) Afternoon
Q8: Which method of heat transfer occurs in liquids and gases?
A) Radiation
B) Conduction
C) Convection
D) Insulation
Q9: The normal temperature of the human body is:
A) 35°C
B) 36°C
C) 37°C
D) 38°C
Q10: Which type of thermometer is used in laboratories?
A) Digital thermometer
B) Clinical thermometer
C) Laboratory thermometer
D) Infrared thermometer
Force, Pressure and Friction
Q1: Which is a non-contact force?
A) Frictional force
B) Muscular force
C) Magnetic force
D) Push force
Q2: What happens to friction when surfaces become smoother?
A) Increases
B) Decreases
C) Remains same
D) Turns into heat
Q3: Why do camels have broad feet?
A) To increase speed
B) To reduce pressure on sand
C) To jump higher
D) To dig sand
Q4: Which type of friction occurs when an object starts moving?
A) Sliding friction
B) Static friction
C) Rolling friction
D) Fluid friction
Q5: Which action increases friction?
A) Oiling machine parts
B) Making surface smooth
C) Roughening the surface
D) Using ball bearings
Q6: What is pressure?
A) Force multiplied by area
B) Force divided by area
C) Area divided by force
D) Force added to mass
Q7: Why are sharp knives used to cut vegetables?
A) To reduce friction
B) To decrease effort
C) To increase pressure
D) To increase surface area
Q8: Which friction helps walking without slipping?
A) Sliding friction
B) Static friction
C) Rolling friction
D) Limiting friction
Q9: Which force pulls objects towards the Earth?
A) Magnetic force
B) Gravitational force
C) Muscular force
D) Frictional force
Q10: Which type of friction is least?
A) Static friction
B) Sliding friction
C) Rolling friction
D) Fluid friction
Sound
Q1: What type of energy is sound?
A) Light energy
B) Heat energy
C) Mechanical energy
D) Chemical energy
Q2: Sound needs which of the following to travel?
A) Only air
B) Only solid
C) Only liquid
D) A medium
Q3: Which part of the ear converts sound vibrations into signals?
A) Ear drum
B) Cochlea
C) Pinna
D) Ear canal
Q4: Which musical instrument produces sound by vibration of strings?
A) Tabla
B) Flute
C) Guitar
D) Mridangam
Q5: Which of the following is an example of noise pollution?
A) Birds singing
B) Music at a low volume
C) Continuous loud speaker sound
D) Flowing river
Q6: What determines the pitch of a sound?
A) Amplitude
B) Frequency
C) Speed of sound
D) Medium of travel
Q7: Which frequency range is audible to humans?
A) 2–200 Hz
B) 20–20,000 Hz
C) 200–20,000 Hz
D) 0–100 Hz
Q8: Which part of the ear collects sound waves?
A) Cochlea
B) Ear drum
C) Pinna
D) Auditory nerve
Q9: Which sound is useful for medical scanning?
A) Infrared
B) Radio waves
C) Ultrasonic sound
D) Audible sound
Q10: Sound cannot travel through:
A) Air
B) Water
C) Iron
D) Vacuum
Combustion, Flame and Fuels
Q1: What is necessary for combustion to take place?
A) Fuel only
B) Oxygen only
C) Fuel, oxygen and heat
D) Fuel and water
Q2: Which type of combustion occurs very slowly?
A) Rapid combustion
B) Explosion
C) Spontaneous combustion
D) Slow combustion
Q3: Which zone of a candle flame is the hottest?
A) Innermost zone
B) Middle luminous zone
C) Outermost non-luminous zone
D) Wick zone
Q4: Which fuel is considered the cleanest?
A) Coal
B) Petrol
C) LPG
D) Wood
Q5: Which gas is mainly responsible for the greenhouse effect due to combustion?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Hydrogen
Q6: Which product is formed during incomplete combustion of fuel?
A) Carbon dioxide only
B) Carbon monoxide
C) Oxygen
D) Nitrogen
Q7: Which fuel is used in CNG vehicles?
A) Coal
B) Diesel
C) Compressed Natural Gas
D) Petrol
Q8: What is the main use of a fire extinguisher?
A) To increase fire
B) To stop combustion
C) To produce sparks
D) To make flame larger
Q9: Which solid fuel is obtained from coal?
A) Coke
B) LPG
C) Petrol
D) Kerosene
Q10: Which factor mainly decides fuel efficiency?
A) Shape of fuel
B) Colour of fuel
C) Amount of heat produced per unit mass
D) Smell of fuel
Some Natural Phenomena
Q1: What is produced when a plastic comb is rubbed on dry hair?
A) Heat energy
B) Magnetic force
C) Static electricity
D) Sound energy
Q2: Which statement is correct about electric charges?
A) Like charges attract each other
B) Unlike charges repel each other
C) Like charges repel each other
D) All charges attract each other
Q3: Which device protects buildings from lightning?
A) Transformer
B) Lightning conductor
C) Switch
D) Circuit breaker
Q4: Which layer of the Earth is responsible for earthquakes?
A) Mantle
B) Outer core
C) Crust
D) Inner core
Q5: Which is the safest place during an earthquake?
A) Under a strong table
B) Near a window
C) On an open staircase
D) Inside a lift
Q6: During lightning, what should we avoid holding?
A) Plastic bottle
B) Wooden stick
C) Metal objects
D) Rubber ball
Q7: What is the main cause of tides and earthquakes?
A) Solar wind
B) Plate movements
C) Wind pressure
D) Earth rotation only
Q8: Which natural disaster is caused by undersea earthquakes?
A) Volcano
B) Cyclone
C) Tsunami
D) Flood
Q9: What should you do during a lightning storm if you are outside?
A) Stand under a tall tree
B) Lie flat on open ground
C) Move inside a concrete building
D) Hold an umbrella
Q10: Which instrument records earthquake vibrations?
A) Barometer
B) Anemometer
C) Seismograph
D) Altimeter