CBSE class 7 chapter light Q/A

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Correctly structured CBSE MCQ Quiz that offers the greatest academic value will not simply indicate if the student’s answer is right or wrong, it will go further by clearly explaining the reasons why each answer was right or wrong – thus ensuring the all-important continuation of the learning process.

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Q1:What is light?

Answer: Light is a form of energy.When it falls on any object then we can see them.

Q2:What is light ray?

Answer: The direction or path along which light energy travels in a medium is called a ray of light.

Q3:What is beam of light ?

Answer: A group of light rays is called a beam of light.

Q4::What are the three beams of light?

Answer: Beams of light can be of 3 types. They are parallel, convergent and divergent.

Q5:Light travels along a straight line. Is iT true ?

Answer: True and this is called rectilinear propagation of light

Q6: What is the speed of light ?

Answer: 300000 Km/s

Q7:Can light travel through Vacuum?

Answer: Yes, It can .

Q8:Is the speed of light same in all medium?

Answer: No speed of light varies from one medium to another. It travels faster in low density material than high density material.

Q9:What is light made up of ?

Answer: Light is made up of packets of energy called photons which travel in a straight line at a very fast speed.

Q10:What is reflecetion ?

Answer: Mirror or any polished surface changes the direction of light that falls on it. This change of direction by a mirror or any polished surface is called reflection of light

Q11:What is the cause of reflection?

Answer: Change in path of direction of light when light falls on any polished surface or mirror.

Q12:What is an image?

Answer: Due to the reflection of light, the impression of an object formed in a mirror is called the image of the object.Actually,It is the collection of focus points of light rays coming from an object.

Q13:What is real image?

Answer: When an image is formed on a screen with the help of a mirror, it is called a Real Image.

Q14:What is virtual image?

Answer: An image which can't be obtained on a screen with the help of a mirror, it is called Virtual Image.

Q15:What is earact image ?

Answer: An erect image is an image which is upright.

Q16:What is inverted image ?

Answer: An image which is not erect is called inverted image.

Q17: Are real images inverted?

Answer: Yes

Q18:Virtual images are erect. Is it true?

Answer: True

Q19:What is the nature of image formed by plane mirror?

Answer: The image formed by the plane mirror is always virtual, upright, laterally inverted and of the same shape and same size of the object it is reflecting.

Q20:What do you understand from laterally inveretion ?

Answer: Lateral inversion is the reversal of mirror image where the right side of the object appears on the left side behind the mirror.

Q21:As the distance of the object from the mirror increases, the distance of the image also increases. Is It True/ False.?

Answer: True

Q22:Why the word ‘AMBULANCE’ is painted left-right inversed on the vehicle??

Answer: It is because when the driver of a vehicle in front looks into his rear - view mirror, can read ambulance inveresed letters written as AMBULANCE correctly & quickly .They give way to it.

Q23:State the principle used in creating a mirror image.?

Answer: Reflection

Q24:What do you understand from term spherical mirror/curved mirror ?

Answer: A miiror whose reflecting surface is part of hollow mirror is called spherical mirror.

Q25:What are different types of spherical mirror?

Answer: Concave and convex mirrors

Q26:What is application of spherical mirror?

Answer: Spherical mirrors has various applications.Such as sunglasses, rear view mirrors, shaving mirror.

Q27:What is a concave mirror?

Answer: A concave mirror is a spherical mirror whose reflecting surface is on the inner side. It is also known as a converging mirror

Q28:What is a convex mirror?

Answer: A convex mirror is a spherical mirror whose reflecting surface bulges out and it divereges the light beam so it is called diverging mirror.

Q29:What is the nature of images formed by concave mirror?

Answer: A concave mirror produces a smaller, bigger and inverted image based on its distance from the object.

Q30: When concave mirror forms smaller image than object ?

Answer: When the distance between object and mirror is large, a small inverted ,virtual image is formed

Q31:When concave mirror forms large and upright image .?

Answer: When the distance between object is very close to the mirror.

Q32:What is the nature of image formed by convex mirror ?

Answer: Image formed by a convex mirror is erect, virtual and smaller in size than the object.

Q33:What is lense?

Answer: A Lens is a type of mirror which refracts the light instead of reflection.

Q34:What is a magnification glass?

Answer: It is a kind of lense used to see small letter/object . It magnifies small letters/object and can see easily.

Q35: How many types of lenses?

Answer: They are 1. concave lense and 2. convex lense

Q36:Why concave lense is called diverging lense?

Answer: A concave lense diverges (bend outwards) tha light beam falling on it so it is called diverging lense.

Q37:Why convex lense is called converging lense?

Answer: A convex lens converges (bends inward) the light beam generally falling on it. Therefore, it is called a converging lens.

Q38:How many colours are present in a rainbow?

Answer: 7

Q39:Which splits a beam of sunlight into seven colours?

Answer: Prism

Q40:What is spectrum ?

Answer: A prism. splits a beam of sunlight into seven colours. The splitting of white light into its component colours is called dispersion and seven colours are called spectrum