Rectilinear Propagation & Pinhole Camera — Homi Bhabha Class 6 Physics MCQs with Solutions
Free Homi Bhabha Class 6 Physics Rectilinear Propagation & Pinhole Camera MCQs with step-by-step solutions (10 questions). Part of Light and Shadows. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Rectilinear Propagation & Pinhole Camera · easy · theory
Light travels in a:
A. straight line ✓ Correct
B. circle
C. zig-zag path
D. curved path
Solution: In a clear medium, light always travels in straight lines. This is why we get sharp shadows and can use a pinhole camera.
Q2 — Rectilinear Propagation & Pinhole Camera · easy · theory
The travelling of light in a straight line is called:
A. refraction of light
B. reflection of light
C. rectilinear propagation of light ✓ Correct
D. rotation of light
Solution: Rectilinear propagation means light moves in straight lines. "Rectilinear" simply means "in a straight line".
Q3 — Rectilinear Propagation & Pinhole Camera · easy · theory
A pinhole camera works because light:
A. does not move at all
B. travels in straight lines ✓ Correct
C. travels in curves
D. gives out its own light
Solution: Light from the object passes straight through the tiny hole in straight lines and forms an image on the screen at the back.
Q4 — Rectilinear Propagation & Pinhole Camera · easy · theory
The image formed on the screen of a pinhole camera is:
A. with no shape at all
B. always coloured red
C. upside down (inverted) ✓ Correct
D. upright and same size
Solution: Rays from the top and bottom of the object cross at the tiny hole, so the image formed on the screen is upside down (inverted).
Q5 — Rectilinear Propagation & Pinhole Camera · medium · theory
You can see a candle flame through the holes of three cardboard sheets only when the holes are:
A. of different sizes
B. arranged in a zig-zag
C. arranged in a straight line ✓ Correct
D. painted black
Solution: Because light travels in straight lines, it can reach your eye only when all three holes lie in one straight line with the flame.
Q6 — Rectilinear Propagation & Pinhole Camera · medium · theory
If the hole of a pinhole camera is made a little bigger, the image becomes:
A. upright
B. sharper and clearer
C. smaller and clearer
D. brighter but more blurred ✓ Correct
Solution: A bigger hole lets in more light, so the image is brighter, but rays overlap on the screen, making the image blurred.
Q7 — Rectilinear Propagation & Pinhole Camera · medium · theory
The image formed by a pinhole camera is best described as:
A. only a plain shadow
B. real and inverted ✓ Correct
C. virtual and upright
D. the same way up as the object
Solution: The pinhole camera forms a real image (it can fall on a screen) that is inverted (upside down) compared with the object.
Q8 — Rectilinear Propagation & Pinhole Camera · medium · theory
Which everyday observation shows that light travels in straight lines?
A. A shadow forms behind an opaque object ✓ Correct
B. We can hear sound around corners
C. We can easily see around corners
D. Light bends over a high wall
Solution: Light cannot bend around an opaque object, so the space behind it stays dark as a shadow. This shows light moves in straight lines.
Q9 — Rectilinear Propagation & Pinhole Camera · hard · theory
In a pinhole camera, why does an upright tree form an upside-down image on the screen?
A. The light bends sharply at the hole
B. The screen flips the picture over
C. The camera slowly spins around
D. Light rays from the top and bottom travel straight and cross at the hole ✓ Correct
Solution: Light from the top of the tree goes straight down to the bottom of the screen, and light from the bottom goes to the top. The straight rays cross at the hole, giving an inverted image.
Q10 — Rectilinear Propagation & Pinhole Camera · hard · theory
In a pinhole camera, the screen is moved farther away from the hole (the box is made longer). The image on the screen becomes:
A. upright
B. smaller
C. completely dark at once
D. larger ✓ Correct
Solution: A longer distance between the hole and the screen lets the straight rays spread out more before landing, so the image is larger (though a bit dimmer).