Sunday, November 24, 2024

MCQs Science Olympiad for Class 4, Chapter - Heat, Light and sound

 

MCQs for Class 4 Science Olympiad Exam: Heat, Light, and Sound

Heat

  1. Which of the following is a good conductor of heat?
    a) Plastic
    b) Wood
    c) Copper
    d) Paper
    Answer: c) Copper

  2. Which of the following materials is an insulator?
    a) Metal
    b) Plastic
    c) Iron
    d) Aluminum
    Answer: b) Plastic

  3. What is the primary source of heat energy on Earth?
    a) Moon
    b) Sun
    c) Stars
    d) Planets
    Answer: b) Sun

  4. Which of these objects expands when heated?
    a) Plastic bottle
    b) Rubber band
    c) Metal rod
    d) Glass sheet
    Answer: c) Metal rod

  5. What 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

  1. What enables us to see objects around us?
    a) Heat
    b) Light
    c) Sound
    d) Wind
    Answer: b) Light

  2. Which of the following is a luminous object?
    a) Moon
    b) Candle
    c) Earth
    d) Mirror
    Answer: b) Candle

  3. Which phenomenon causes a rainbow to form?
    a) Reflection
    b) Refraction
    c) Absorption
    d) Emission
    Answer: b) Refraction

  4. What 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 reflected

  5. Which color of light bends the most during refraction?
    a) Red
    b) Green
    c) Blue
    d) Violet
    Answer: d) Violet

Sound

  1. Sound is produced by:
    a) Reflection
    b) Vibrations
    c) Light waves
    d) Heat energy
    Answer: b) Vibrations

  2. Which of these travels fastest?
    a) Light
    b) Sound
    c) Air
    d) Water
    Answer: a) Light

  3. Sound travels faster in:
    a) Air
    b) Water
    c) Steel
    d) Vacuum
    Answer: c) Steel

  4. What do we call the back-and-forth motion that produces sound?
    a) Compression
    b) Rarefaction
    c) Vibration
    d) Reflection
    Answer: c) Vibration

  5. Which part of the ear helps us to hear sound?
    a) Eyes
    b) Ear drum
    c) Nose
    d) Tongue
    Answer: b) Ear drum

Mixed Questions

  1. 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 hot

  2. Which of these is not a source of light?
    a) Torch
    b) Firefly
    c) Moon
    d) Star
    Answer: c) Moon

  3. Which property of sound determines how high or low a sound is?
    a) Volume
    b) Pitch
    c) Echo
    d) Speed
    Answer: b) Pitch

  4. What 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 mirror

  5. Which 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

  1. Which of these is a bad conductor of heat?
    a) Iron
    b) Copper
    c) Wood
    d) Silver
    Answer: c) Wood

  2. What do we call the transfer of heat through liquids and gases?
    a) Conduction
    b) Convection
    c) Radiation
    d) Reflection
    Answer: b) Convection

  3. Which device is used to measure temperature?
    a) Thermometer
    b) Barometer
    c) Hygrometer
    d) Speedometer
    Answer: a) Thermometer

  4. Why 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 heat

  5. What happens to a solid when it is heated?
    a) It contracts
    b) It melts
    c) It freezes
    d) It evaporates
    Answer: b) It melts

  6. What type of heat transfer happens when the Sun warms the Earth?
    a) Conduction
    b) Convection
    c) Radiation
    d) Reflection
    Answer: c) Radiation

  7. Which part of the body helps us sense heat?
    a) Eyes
    b) Skin
    c) Ears
    d) Nose
    Answer: b) Skin

  8. What is the boiling point of water at sea level?
    a) 0°C
    b) 50°C
    c) 100°C
    d) 120°C
    Answer: c) 100°C

  9. Which of these materials is used in making insulators?
    a) Aluminum
    b) Rubber
    c) Copper
    d) Gold
    Answer: b) Rubber

  10. Why 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

  1. 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/s

  2. Which of the following objects allows light to pass through completely?
    a) Wood
    b) Frosted glass
    c) Transparent glass
    d) Cardboard
    Answer: c) Transparent glass

  3. What 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 dark

  4. What causes the change in direction of light when it passes from air to water?
    a) Reflection
    b) Absorption
    c) Refraction
    d) Emission
    Answer: c) Refraction

  5. Which instrument is used to split white light into its colors?
    a) Microscope
    b) Telescope
    c) Prism
    d) Thermometer
    Answer: c) Prism

  6. Which color of light has the longest wavelength?
    a) Red
    b) Green
    c) Blue
    d) Violet
    Answer: a) Red

  7. Which part of the eye helps us focus light?
    a) Retina
    b) Lens
    c) Pupil
    d) Cornea
    Answer: b) Lens

  8. What is formed when light is blocked by an object?
    a) Reflection
    b) Refraction
    c) Shadow
    d) Heat
    Answer: c) Shadow

  9. What type of mirror is used in shaving?
    a) Plane mirror
    b) Convex mirror
    c) Concave mirror
    d) Transparent mirror
    Answer: c) Concave mirror

  10. Which property of light explains why we see colors?
    a) Reflection
    b) Refraction
    c) Dispersion
    d) Absorption
    Answer: c) Dispersion

Sound

  1. Sound cannot travel through:
    a) Solids
    b) Liquids
    c) Gases
    d) Vacuum
    Answer: d) Vacuum

  2. What is the unit of loudness of sound?
    a) Hertz
    b) Decibel
    c) Newton
    d) Watt
    Answer: b) Decibel

  3. Which of these is the slowest medium for sound to travel through?
    a) Air
    b) Water
    c) Steel
    d) Glass
    Answer: a) Air

  4. What is the term for a sound that is reflected back to the listener?
    a) Noise
    b) Echo
    c) Pitch
    d) Wave
    Answer: b) Echo

  5. Which 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 above

  6. Which of these animals can hear ultrasonic sounds?
    a) Humans
    b) Elephants
    c) Bats
    d) Birds
    Answer: c) Bats

  7. What 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 Hz

  8. Why 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 noise

  9. Which of these is an example of noise pollution?
    a) Birds chirping
    b) Traffic sounds
    c) Whispering
    d) Light breeze
    Answer: b) Traffic sounds

  10. What is the highness or lowness of a sound called?
    a) Loudness
    b) Echo
    c) Pitch
    d) Volume
    Answer: c) Pitch

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