MARKS 25
5X1=5
STO: VII
PHYSICAL SCIENCE
CHOOSE THE CORRECT ANSWER:
1. Light is a form of
a) Matter
b) Energy
Medium
d) Particle
2. Which of the following is the best reflector of light?
a) Plastic plate
b) Plane mirror
d Wall
d) Paper
3. Light that hits a mirror gets
a) Transmitted
b) Reflected
Absorbed
d) Refracted
4. Sunlight is a blend of
colours
a) 5
b) 6
c) 7
5.1 Red - 1 Blue =
a) Magenta
b) Cyan
Yellow
d) Black
5X2=10
IL GIVE VERY SHORT ANSWER: (ANY 5)
6. What are the parts of shadow
7. What are the three types of materials based on the absorption of light?
8. What is reflection of light?
9. What is Prism?
10. What are luminous Objects?
11. What do you mean by lateral inversion?
12. What is a shadow?
ANSWER BRIEFLY: (ANY 1)
1X4=4
13. Define the terms
a) Incident ray
b) Reflected ray
c) Normal
d) Angle of incidence
14. Draw a diagram of a pinhole camera showing the rays of light passing between
the object and its image.
IV.
1X6=6
ANSWER IN DETAIL: (ANY 1)
15. Differentiate between a reflection and a shadow.
16. Compare the images formed by plane mirror with that by pinhole camera.
Answers
Answer:
1.energy
2.plane mirror
3.reflected
4.7 colours
5.idk the ans , sry
6.The umbra, penumbra and antumbra are three distinct parts of a shadow, created by any light source after impinging on an opaque object.
7.Air, glass and water
8.whenever a ray of light strikes a polished surface it reflects.this is known as reflection of light
9.In geometry, a prism is a polyhedron comprising an n-sided polygonal base, a second base which is a translated copy of the first, and n other faces joining corresponding sides of the two bases. All cross-sections parallel to the bases are translations of the bases.
10.Luminous objects are objects that generate their own light. Illuminated objects are objects that are capable of reflecting light to our eyes. The sun is an example of a luminous object, while the moon is an illuminated object.
11. The type of reversal that occurs with an image formed by a plane mirror. A person with a mole on his left cheek sees an image in a plane mirror of a person with a mole on his right cheek.
12.A shadow is a dark area where light from a light source is blocked by an opaque object. It occupies all of the three-dimensional volume behind an object with light in front of it. The cross section of a shadow is a two-dimensional silhouette, or a reverse projection of the object blocking the light.
13.a.incident ray:the ray of light that falls on the reflecting surface is called incident ray.
b.point of incidence: the point at which the incident ray strikes the reflecting surface of the mirror is called point of incidence.
c. Reflected ray:The ray of light which is sent back after reflection by the mirror is called reflected ray.
d.normal:It is a line at right angle to the mirror surface at the point of incidence.
e.Angle of incidence: the angle that the incident ray makes with the normal at the point of incidence is called angle of incidence.
f. Angle of reflection: The angle that the reflected ray makes with the normal at the point of incidence is called the angle of reflection.
15.Image result for Difference between a reflection and a shadow.
Shadows and reflections are the effects of light. Shadows are formed when objects block a source of light. ... Reflections are caused by light bouncing off objects. Smooth things usually make better reflectors than rough ones.
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Explanation: