1. CONCISE Physics - Middle School - 8
2. Physical Quantities and Measurement
3. Force and Pressure
5. Light Energy
6. Heat Transfer
1. Objective Questions
2. Short/Long Answer Questions
Q1) State the speed of light in (a) air, (b) water, and (c) glass
Q2) How does the speed of light determine the optical density of a medium?
Q3) Which is optically denser: Water or air ? Give reason.
Q4) Out of air and glass which is optically rarer? Give reason.
Q5) What do you understand by refraction of light?
Q6) Describe an experiment to show that a light ray bends when it passes from one transparent medium into another transparent medium.
Q7) Draw a ray diagram to show that the depth of a vessel containing water when seen from above, appears to be less than its real depth.
Q8) Define the following terms:
Incident ray, Refracted ray, Angle of Incidence, Angle of refraction
Q9) A ray of light falls normally on a glass slab. What is the angle of incidence?
Q10) A ray of light travels from a rarer medium to a denser medium. How will it bend?
Q11) A ray of light travels from a denser medium to a rarer medium. How will it bend?
Q12) The diagram given below in figure shows a ray of light AO falling on a surface separating two media. Draw the refracted ray in each case
Q13) Draw a diagram showing the refraction of a light ray from water to glass. Label on it the incident ray, the angle of incidence and the angle of refraction (r).
Q14) The diagram in figure shows a ray of light AO falling on a rectangular glass slab PQRS. Complete the diagram till the ray of light emerges out of the slab. Label on the diagram the incident ray, the refracted ray and the emergent ray.
Q15) Explain the following:
(a) A coin placed at the bottom of a vessel appears to be raised when water is poured in the vessel.
(b) A straight stick partly dipped in water obliquely, appears to be bent at the surface of water.
(c) The sun is seen before the sunrise and after the sunset.
Q16) What is mirage? Give a reason for its formation?
Q17) What is a prism? Draw a ray diagram to show the refraction of a light ray through prism.
Q18) What do you mean by the term dispersion?
Q19) A ray of light falls on a prism. Draw a ray diagram to show that the prism disperses the white light.
Q20) In figure, AO is the ray of white light falling on a prism PQR. Complete the diagram till the light emerges out from the prism and falls on the screen.
Q21) What do you understand by the term spectrum? Name the various colours present in the spectrum of sunlight.
Q22) You are given a disc divided into seven sectors with colours violet, indigo, blue, green, yellow, orange and red in them. What would be its colour when it is rotated rapidly?
Q23) State the two laws of reflection of light.
Q24) What is a spherical mirror?
Q25) State the two kinds of spherical mirror and distinguish them with the aid of proper diagrams.
Q26) Explain the following terms:
Pole, Centre of curvature, Radius of curvature, Principal axis.
Show them on separate diagrams for each of the concave and convex mirrors.
Q27) What do you understand by the focus and focal length of a spherical mirror? Show them on the separate diagrams for each of a concave mirror and convex mirror.
Q28) Draw a suitable diagram to illustrate how a beam of light incident parallel to the principal axis is reflected by:
(a) a concave mirror and (b) a convex mirror
Q29) How is a spherical mirror used to converge a beam of light at a point? Name the type of mirror used.
Q30) How is a spherical mirror used to diverge a beam of light from a point? Name the type of mirror used.
Q31) State the direction of incident ray which after reflection from a spherical mirror gets reflected along its own path. Give a reason.
Q32) How is the focal length of a spherical mirror related to its radius?
Q33. The diagram (figure) given below shows two parallel rays 1 and 2 incident on (a) a concave mirror, (b) a convex mirror. Draw the reflected rays and mark the focus by the symbol F
Q34) Complete the following diagrams in figure by drawing the reflected rays for the incident rays 1 and 2 if F is the focus and C is the centre of curvature.
Q35) Which are the two convenient rays that are chosen to construct the image by a spherical mirror for a given object? Explain with the help of suitable ray diagrams.
Q36) Draw a ray diagram to show the formation of an image of an object placed beyond the centre of curvature of a concave mirror.State the position, size and nature of the image.
Q37. Draw a ray diagram to show the formation of image of an object placed at the centre of curvature of a concave mirror. State the position, size and nature of the image.
Q38) Draw a ray diagram to show the formation of image of an object placed between the focus and centre of curvature of a concave mirror. State the position, size and nature of the image.
Q39) Draw a ray diagram to show the formation of image of an object placed between the pole and focus of a concave mirror. State the position, size and nature of the image.
Q40) Draw a ray diagram to show the formation of image of an object placed on the principal axis of a convex mirror. State the position, size and nature of the image. What happens to the image as the object is moved away from the mirror?
Q42) Name the mirror which always forms an erect and virtual image.What is the size of the image as compared to that of the object?
Q43) Name the mirror which forms an erect, virtual and enlarged image of an object. What is the position of object relative to the mirror?
Q44) What is a real image ? Name the mirror which can be used to obtain the real image of an object. What should be the position of the object relative to the mirror?
Q45) How can a concave mirror be used to obtain a virtual image of an object? Draw a diagram to illustrate your answer.
Q46) State two uses of a concave mirror.
Q47) State two uses of convex mirror.
Q48) A driver uses a convex mirror as a rear view mirror.Explain the reason with the help of a ray diagram.
Q49) State the kind of mirror used
(a) by a dentist, and
(b) as a street light reflector
Q50) Name the kind of mirror used to obtain
(a) a real and enlarged image
(b) A virtual and enlarged image
(c) a real and diminished image, and
(d) a virtual and diminished image
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CONCISE Physics - Middle School - 8
Physical Quantities and Measurement
Force and Pressure
Short/Long Answer Questions
Race To Space
Terms & Policies