Start learning →

Olympiad (Class 7) Light — practice questions — page 2

Explore 54 free Light questions in Olympiad (Class 7) Science. Open each question or exercise to read its content, reference answers and available explanation.

Practise Light with Quill →

Light questions and exercises with answers

Showing questions 31–54 of 54.

A bigger bulb replaces a small one at the same spot. How does the shadow edge change?Read the answer and worked solution →Why are few shadows seen under a heavily overcast sky?Read the answer and worked solution →Why are shadows on the Moon's surface sharp and dark compared with shadows on Earth?Read the answer and worked solution →A lunar eclipse happens when whose shadow falls on whom?Read the answer and worked solution →A solar eclipse is the result of a shadow cast by which body onto which?Read the answer and worked solution →The Sun can be exactly overhead only between which two lines?Read the answer and worked solution →Why does a daytime shadow in sunlight look bluish?Read the answer and worked solution →An object is lit by two lamps. Where is the shadow darkest?Read the answer and worked solution →A hand is held between a lamp and a wall. Moving the hand toward the wall does what to the shadow?Read the answer and worked solution →A light fog lets us see the shadow of a tree as a dark lane in the air. This shows that a shadow is what?Read the answer and worked solution →How does the scene projected inside a pinhole camera appear?Read the answer and worked solution →What does a pinhole camera use instead of a lens?Read the answer and worked solution →In a pinhole camera the screen is moved farther from the pinhole. What happens to the image size?Read the answer and worked solution →A tree is moved farther from a pinhole camera. What happens to its size on the fixed screen?Read the answer and worked solution →A pinhole projection onto a translucent screen is used for safe viewing of which event?Read the answer and worked solution →Reflection means a wave does what at the boundary between two media?Read the answer and worked solution →An echo is an example of which wave behaviour?Read the answer and worked solution →What does an ordinary household mirror usually have behind its glass sheet?Read the answer and worked solution →Compared with a mirror, a glass window reflects light in what way?Read the answer and worked solution →Light hits the surface of water. Which statement is correct?Read the answer and worked solution →By the laws of reflection, where do the incident ray and reflected ray lie relative to the normal?Read the answer and worked solution →How are the incident ray, reflected ray and normal related?Read the answer and worked solution →A ray makes 25 degrees with a plane mirror's surface. What angle does it make with the reflected ray?Read the answer and worked solution →Why do night animals' eyes shine in a torch beam?Read the answer and worked solution →

Worked practice questions

A bigger bulb replaces a small one at the same spot. How does the shadow edge change?

  1. Becomes sharper
  2. Becomes more blurred
  3. Stays unchanged
  4. Disappears fully
Show answer and solution

Correct answer: B. Becomes more blurred

A wider source gives a bigger penumbra, so the edge of the shadow turns soft and blurred.

Open this question →

Why are few shadows seen under a heavily overcast sky?

  1. Clouds scatter light widely
  2. The Sun is too bright
  3. Clouds absorb all light
  4. The air is too dry
Show answer and solution

Correct answer: A. Clouds scatter light widely

Clouds scatter sunlight so it comes from everywhere, which softens shadow outlines until they vanish.

Open this question →

Why are shadows on the Moon's surface sharp and dark compared with shadows on Earth?

  1. Moon dust is black
  2. No air to diffuse light
  3. Sunlight is weaker there
  4. The Moon is spinning
Show answer and solution

Correct answer: B. No air to diffuse light

With no atmosphere to scatter light, the boundary between lit and shaded ground is stark.

Open this question →

How to practise

  1. Choose a Light question and try to work out your answer.
  2. Open the question to check the correct answer and read its worked solution.
  3. Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.

Put it into practice

Continue with Light practice for Olympiad (Class 7). Read explanations as you go. No signup form needed to start.

Practise Light →

More Science topics

Reproduction in PlantsElectric current and its effectsWinds, storms and cyclonesNutrition in plants and animalsTransportation in plants and animalsWeather, Climate and Adaptations of AnimalsAcids, bases and saltsHeat