SSC CGL Science – Light & Optics – Level 1 · Warm-up · Tier I Level

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SSC CGL Science – Light & Optics – Level 1 · Warm-up · Tier I Level – 12 questions, subject: General Science. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.

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1.  
One-line factThe mirror placed behind the bulb of a torch or a car headlight, to send out a parallel beam, is:

Correct Answer: C [concave]

Explanation:

A bulb at the focus of a concave mirror gives a parallel beam.

2.  
A shaving mirror is a:

Correct Answer: B [concave mirror]

Explanation:

Face within F → enlarged, erect image.

3.  
The SI unit of power of a lens is:

Correct Answer: D [dioptre]

Explanation:

Answer: dioptre. P = 1/f with f in metres.

4.  
The image formed by a plane mirror is:

Correct Answer: A [virtual, erect and laterally inverted]

Explanation:

Same size, as far behind as the object is in front.

5.  
Fill in the blankThe splitting of white light into its seven colours by a glass prism is called ____.

Correct Answer: B [dispersion]

Explanation:

Each colour bends by a different amount (violet most, red least).

6.  
Myopia (short sight) is corrected by using a:

Correct Answer: A [concave lens]

Explanation:

Answer: concave lens. Myopia → minus lens.

7.  
The sparkling of a diamond is due to:

Correct Answer: C [total internal reflection]

Explanation:

Very small critical angle (≈ 24°) traps light.

8.  
Odd one outOdd one out (by the phenomenon):

Correct Answer: D [blue colour of the sky]

Explanation:

The others involve total internal reflection; the blue sky is due to scattering.

9.  
In the spectrum of white light from a prism, the colour that deviates the most is:

Correct Answer: D [violet]

Explanation:

Violet is bent most, red least.

10.  
Statement-basedConsider the statements:
I. Light travels faster in glass than in air.
II. Light can travel through vacuum.
Which is/are correct?

Correct Answer: C [Only II]

Explanation:

v = c/n is smaller in glass; light needs no medium.

11.  
To an astronaut standing on the Moon in daytime, the sky appears:

Correct Answer: B [black]

Explanation:

The Moon has no atmosphere, so no sunlight is scattered – the sky looks black.

12.  
The least distance of distinct vision for a normal eye is about:

Correct Answer: A [25 cm]

Explanation:

The near point of a normal eye.

➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 General Science book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-general-science

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