10th Class Physics Half Book Test Urdu Medium

Important 10th class physics half book test urdu medium by Mr. Ulfat Habib Suib. These Test series notes are very helpful in the preparation of 10th class physics half book test urdu medium for students of the 10th class Physics and these are according to the paper patterns of all Punjab boards.

• Q: What do you understand by the longitudinal waves? Describe the longitudinal nature of sound waves.
• Ans: Those waves in which particles of medium vibrate parallel to the motion of waves are called longitudinal waves. These waves move with the help of compressions and rarefactions. Sound waves are also longitudinal waves because sound also travels with the help of compressions and rarefactions. When we speak compressions and rarefactions are formed in air. Pressure also changes during compressions and rarefactions.
• Q: We know that waves manifest phenomenon of reflection, refraction and diffraction. Does sound also manifest these characteristics?
• Ans: All the waves manifest Phenomenon of reflection, refraction, interference and diffraction. Sound is form of energy and it propagates in the form of waves. When another medium is placed in the path it obeys the laws of reflection, refraction and diffraction.
• Q: Sound is form of wave. List at least three reasons to support the idea that sound is a wave?
• Ans: List of least three reasons to support the idea that sound is a wave:
• Sound is a form of energy which obeys the laws of diffraction.
• Sound is a form of energy which obeys laws of refraction.
• Sound is a form of energy which obeys laws of reflection.
• Q: What do you understand by reflection of light? Draw a diagram to illustrate reflection at a plane surface.
• Ans: Reflection: When light travelling in a certain medium, falls on the surface of another medium, a part of it turns back in the same medium. This is called reflection of light.
• Q: State laws of reflection.
• Ans: Laws of Reflection: 
• The incident ray, the normal and the reflected ray at the point of incidence all lie in the same plane.
• The angle of incidence is equal to the angle of reflection.
• Q: Define refraction of light.
• Ans: The bending of light as it passes from one transparent medium to another transparent medium is called refraction of light.
• Q: Define angle of refraction.
• Ans: Angle of Refraction:
• The angle between the refracted ray and normal is called angle of refraction.
• The formula for focal length is: OR The relation between focal length and radius of curvature is:  (A) Wm-2 (B) f = R/3 (C) f = R/4 (D) f = R/2
• The principal focus of a concave mirror is:  (A) Real (B) Virtual (C) Both a and b (D) None of these
• A converging mirror with a radius of 20 cm creates a real image 30 cm from the mirror. What is the object distance?  (A) -20 cm (B) -7.5 cm (C) -15 cm (D) -5.0 cm
• An object is 14 cm in front of a convex mirror, the image is 5.8 cm behind the mirror. What is the focal length of the mirror?  (A) -20 cm (B) -8.5 cm (C) -4.1 cm (D) -9.9 cm
• An object is placed at the center of curvature of a concave mirror. The image produced by the mirror is located:  (A) At the center of curvature (B) Out beyond the center of curvature (C) Between the center of curvature and focal point (D) At the focal point
• Magnification does not always mean?  (A) Virtual (B) Real (C) Enlargement (D) Smallness
• In magnification image could also be …….. Than the object.  (A) Virtual (B) Real (C) Smaller (D) Same
• Convex mirrors produce images that are smaller than objects. This increase:  (A) View for the observer (B) A and C (C) View for the image (D) None of these