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  Light-Reflection and Refraction class 10th Important MCQ PART A: REFLECTION OF LIGHT (1–50) Plane Mirror (1–10) The image formed by a plane mirror is A) real and inverted B) virtual and erect C) real and erect D) virtual and inverted Ans: B Magnification of a plane mirror is A) –1 B) +1 C) 0 D) >1 Ans: B Distance between object and image in plane mirror when object is 2 m away is A) 2 m B) 3 m C) 4 m D) 1 m Ans: C If the mirror is moved by 1 cm, image moves by A) 0.5 cm B) 1 cm C) 2 cm D) 4 cm Ans: C Image formed by plane mirror is laterally inverted because A) reflection B) refraction C) rotation D) translation Ans: A The size of image in plane mirror is A) smaller B) larger C) same as object D) zero Ans: C Which mirror is used as looking mirror?...

Sound Class 9 Notes Introduction: Sound is a form of energy that produces the sensation of hearing. It is generated by the vibration of objects and travels through a medium such as air, water, or solids in the form of waves . Sources of Sound: Any vibrating body is a source of sound, such as: Tuning fork Drum Loudspeaker Vocal cords Importance of Sound: Helps in communication Used in music and entertainment Useful in medical diagnosis (ultrasound) Used in navigation (SONAR)           Thus, sound plays an important role in our daily life and is an essential topic in Class 9 Physics. Definition: Sound is a form of energy produced by vibrating objects that travels through a material medium in the form of waves and produces the sensation of hearing. Scientifically/Technically Sound is a kind of wave . Wave: A wave is a disturbance that travels through a medium or space and transfers energy from one point to another without the actual transfer of matter...