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Science true or false.[1 Mark each]

PHYSICS CH6 Light · Tamil Nadu Board STD 9 (Tamil - English Medium). 23 questions.

Questions

true or false.[1 Mark each]

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23 questions · timed · auto-graded

Question 11 Mark
State whether true or false. If false, correct the statement.

The reason for brilliance of diamonds is total internal reflection of light.

  • True

  • False

Answer
The reason for brilliance of diamonds is total internal reflection of light- True
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Question 21 Mark
State whether true or false. If false, correct the statement.

When an object is at the centre of curvature of concave mirror the image formed will be virtual and erect.

  • True

  • False

Answer
False.

Correct Statement: The image formed is real, inverted and same size of the object.

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Question 31 Mark
State whether true or false. If false, correct the statement.

The convex mirror always produces a virtual, diminished and erect image of the object.

  • True

  • False

Answer
The convex mirror always produces a virtual, diminished and erect image of the object- True
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Question 41 Mark
State whether true or false. If false, correct the statement.

If a ray of light passes obliquely from one medium to another, it does not suffer any deviation.

  • True

  • False

Answer
False.

Correct Statement: When light travels from one medium to another, it suffers deviation.

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Question 51 Mark
State whether true or false. If false, correct the statement.

The angle of deviation depends on the refractive index of the glass.

  • True

  • False

Answer
The angle of deviation depends on the refractive index of the glass- True
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Question 61 Mark
The angle of incidence at which the angle of refraction is Q£ is called the critical angle.
Answer

False.
Correct statement: The angle of incidence at which the angle of refraction is 90° is called the critical angle.
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Question 71 Mark
Light is one of the slowest travelling energy with a speed of $3 \times 10^{-8} ms ^{-1}$
Answer
False.Correct statement : (Light is one of the fastest travelling energy with a speed of $3 \times 10^{-8} ms ^{-1}$
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Question 81 Mark
The distance from centre of curvature of the mirror to the pole is called the focal length of the mirror.
Answer
False.
Correct statement: The distance between the centre of the mirror and the focal point of the mirror is called the focal length of a mirror.
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Question 91 Mark
An object is placed at a distance of 3cm from a plane mirror. The distance of the object and image is 3cm.
Answer
False.
Correct statement: The distance of the object and image is 6 cm.
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Question 101 Mark
If the object is at infinity in front of a convex mirror the image is formed at infinity.
Answer
False.
Correct statement: The image is formed at F, behind the mirror
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Question 131 Mark
The minimum length of the mirror required to see the full image of the person is half ‘ of his height.
Answer
True.
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Question 151 Mark
Angle of incidence is zero if a ray of light is incident normal to be surface separating the low media.
Answer
True.
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Question 181 Mark
Optical Fibres are based on the phenomenon of dispersion
Answer
False.
Correct statement: Optical Fibres are based on total internal reflection.
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Question 201 Mark
A star appears twinkling into the sky because of the reflection of light by the atmosphere
Answer
False.
Correct statement: A star appears twinkling into the sky because of the refraction of light by the atmosphere.
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Question 211 Mark
The image formed in a plane mirror is always inverted.
Answer
False.
Correct statement: The image formed in a plane mirror is always erect.
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Question 231 Mark
The critical angle is defined as the angle of incidence at which the total internal reflection starts to occur.
Answer
True.
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true or false.[1 Mark each] - Science STD 9 Questions - Vidyadip