MCQs for Class 4 Science Olympiad Exam: Heat, Light, and Sound
Heat
Which of the following is a good conductor of heat?
a) Plastic
b) Wood
c) Copper
d) Paper
Answer: c) CopperWhich of the following materials is an insulator?
a) Metal
b) Plastic
c) Iron
d) Aluminum
Answer: b) PlasticWhat is the primary source of heat energy on Earth?
a) Moon
b) Sun
c) Stars
d) Planets
Answer: b) SunWhich of these objects expands when heated?
a) Plastic bottle
b) Rubber band
c) Metal rod
d) Glass sheet
Answer: c) Metal rodWhat happens to water when it is heated to 100°C?
a) It freezes
b) It evaporates
c) It condenses
d) It becomes solid
Answer: b) It evaporates
Light
What enables us to see objects around us?
a) Heat
b) Light
c) Sound
d) Wind
Answer: b) LightWhich of the following is a luminous object?
a) Moon
b) Candle
c) Earth
d) Mirror
Answer: b) CandleWhich phenomenon causes a rainbow to form?
a) Reflection
b) Refraction
c) Absorption
d) Emission
Answer: b) RefractionWhat happens when light hits a smooth, shiny surface like a mirror?
a) It bends
b) It is absorbed
c) It is reflected
d) It is scattered
Answer: c) It is reflectedWhich color of light bends the most during refraction?
a) Red
b) Green
c) Blue
d) Violet
Answer: d) Violet
Sound
Sound is produced by:
a) Reflection
b) Vibrations
c) Light waves
d) Heat energy
Answer: b) VibrationsWhich of these travels fastest?
a) Light
b) Sound
c) Air
d) Water
Answer: a) LightSound travels faster in:
a) Air
b) Water
c) Steel
d) Vacuum
Answer: c) SteelWhat do we call the back-and-forth motion that produces sound?
a) Compression
b) Rarefaction
c) Vibration
d) Reflection
Answer: c) VibrationWhich part of the ear helps us to hear sound?
a) Eyes
b) Ear drum
c) Nose
d) Tongue
Answer: b) Ear drum
Mixed Questions
What happens to a metal spoon left in a hot cup of tea?
a) It cools down
b) It becomes hot
c) It melts
d) It remains cold
Answer: b) It becomes hotWhich of these is not a source of light?
a) Torch
b) Firefly
c) Moon
d) Star
Answer: c) MoonWhich property of sound determines how high or low a sound is?
a) Volume
b) Pitch
c) Echo
d) Speed
Answer: b) PitchWhat type of mirror is used in car rear-view mirrors?
a) Plane mirror
b) Convex mirror
c) Concave mirror
d) Transparent mirror
Answer: b) Convex mirrorWhich of these sounds has the highest pitch?
a) Drum
b) Bird chirping
c) Thunder
d) Dog barking
Answer: b) Bird chirping
More MCQs for Heat, Light, and Sound
Heat
Which of these is a bad conductor of heat?
a) Iron
b) Copper
c) Wood
d) Silver
Answer: c) WoodWhat do we call the transfer of heat through liquids and gases?
a) Conduction
b) Convection
c) Radiation
d) Reflection
Answer: b) ConvectionWhich device is used to measure temperature?
a) Thermometer
b) Barometer
c) Hygrometer
d) Speedometer
Answer: a) ThermometerWhy are cooking utensils made of metal?
a) Metals are light
b) Metals are good conductors of heat
c) Metals are shiny
d) Metals do not rust
Answer: b) Metals are good conductors of heatWhat happens to a solid when it is heated?
a) It contracts
b) It melts
c) It freezes
d) It evaporates
Answer: b) It meltsWhat type of heat transfer happens when the Sun warms the Earth?
a) Conduction
b) Convection
c) Radiation
d) Reflection
Answer: c) RadiationWhich part of the body helps us sense heat?
a) Eyes
b) Skin
c) Ears
d) Nose
Answer: b) SkinWhat is the boiling point of water at sea level?
a) 0°C
b) 50°C
c) 100°C
d) 120°C
Answer: c) 100°CWhich of these materials is used in making insulators?
a) Aluminum
b) Rubber
c) Copper
d) Gold
Answer: b) RubberWhy do we wear woolen clothes in winter?
a) To absorb sweat
b) To block sunlight
c) To keep us warm
d) To make us look good
Answer: c) To keep us warm
Light
What is the speed of light in air?
a) 300,000 km/s
b) 150,000 km/s
c) 3,000 km/s
d) 30,000 km/s
Answer: a) 300,000 km/sWhich of the following objects allows light to pass through completely?
a) Wood
b) Frosted glass
c) Transparent glass
d) Cardboard
Answer: c) Transparent glassWhat type of shadow is formed when the object is close to the light source?
a) Small and dark
b) Big and dark
c) Faint and blurry
d) Colorful
Answer: b) Big and darkWhat causes the change in direction of light when it passes from air to water?
a) Reflection
b) Absorption
c) Refraction
d) Emission
Answer: c) RefractionWhich instrument is used to split white light into its colors?
a) Microscope
b) Telescope
c) Prism
d) Thermometer
Answer: c) PrismWhich color of light has the longest wavelength?
a) Red
b) Green
c) Blue
d) Violet
Answer: a) RedWhich part of the eye helps us focus light?
a) Retina
b) Lens
c) Pupil
d) Cornea
Answer: b) LensWhat is formed when light is blocked by an object?
a) Reflection
b) Refraction
c) Shadow
d) Heat
Answer: c) ShadowWhat type of mirror is used in shaving?
a) Plane mirror
b) Convex mirror
c) Concave mirror
d) Transparent mirror
Answer: c) Concave mirrorWhich property of light explains why we see colors?
a) Reflection
b) Refraction
c) Dispersion
d) Absorption
Answer: c) Dispersion
Sound
Sound cannot travel through:
a) Solids
b) Liquids
c) Gases
d) Vacuum
Answer: d) VacuumWhat is the unit of loudness of sound?
a) Hertz
b) Decibel
c) Newton
d) Watt
Answer: b) DecibelWhich of these is the slowest medium for sound to travel through?
a) Air
b) Water
c) Steel
d) Glass
Answer: a) AirWhat is the term for a sound that is reflected back to the listener?
a) Noise
b) Echo
c) Pitch
d) Wave
Answer: b) EchoWhich part of a musical instrument controls the pitch of the sound?
a) Strings
b) Air column
c) Membrane
d) All of the above
Answer: d) All of the aboveWhich of these animals can hear ultrasonic sounds?
a) Humans
b) Elephants
c) Bats
d) Birds
Answer: c) BatsWhat is the range of human hearing?
a) 0–20 Hz
b) 20–20,000 Hz
c) 2,000–200,000 Hz
d) 200–2,000 Hz
Answer: b) 20–20,000 HzWhy do we hear better at night?
a) Because there is less light
b) Because there is less noise
c) Because sound travels faster in cold air
d) Because sound travels slower in cold air
Answer: b) Because there is less noiseWhich of these is an example of noise pollution?
a) Birds chirping
b) Traffic sounds
c) Whispering
d) Light breeze
Answer: b) Traffic soundsWhat is the highness or lowness of a sound called?
a) Loudness
b) Echo
c) Pitch
d) Volume
Answer: c) Pitch
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