PHYSICS By MAMTA SINGH

PRE BOARD EXAMINATION 2020  CLASS 12TH  PHYSICS TIME 3:00Hrs            MAXIMUM  MARKS  70 General Instructions: (1) All questions are compulsory. There are 33 questions in all.  (2) This question paper has five sections: Section A, Section B, Section C, Section D and Section E. (3) Section A contains ten very short answer questions and four assertion reasoning MCQs of 1 mark each; Section B has two case based questions of 4 marks each    (4)Section C contains nine short answer questions of 2 marks each, Section D contains five short answer questions of 3 marks each and Section E contains three long answer questions of 5 marks each.                                                   SECTION A Q1Define the term 'intensity of radiation' in photon picture. Q2 How are X-rays produced? Q3 A plane EM- Wave travels in vaccum along Z-axis.What can you say about the direction of electric and magnetic field vectors? Q4 Define ionisation energy.What is its value for a Hydrogen atom? Q5 Wha

         AISSCE PHYSICS                               PRACTICAL EXAM-2024           SUBJECT CODE -042                     CLASS-12            QUESTION -PAPER Q1:One Experiment from section A.                (7-marks)                  SECTION A 1 -To determine  resistivity of two  wires by plotting a graph of potential difference versus current. 2 -To find resistance of a given wire/ standard resistor using metre bridge.  3 -To verify the law of series-combination of Resistances using a metre bridge.  4-To verify the law of parallel-combination of Resistances using a metre bridge. 5-To determine resistance of a galvanometer by half deflection method and to find its figure of merit.  Q2-One Experiment from section B                   (7-marks) 1 -To find the focal length of a convex lens by plotting graphs between u and v or between 1/u and 1/v. 2 -To determine angle of minimum deviation for a given prism by plotting a graph between angle of incidence and angle of deviation. 3 -To determ

AANNUAL EXAMINATION 2021 CLASS 11TH  PHYSICS TIME 3:00Hrs            MAXIMUM  MARKS  70 General Instructions: (1) All questions are compulsory. There are 33 questions in all.  (2) This question paper has five sections: Section A, Section B, Section C, Section D and Section E. (3) Section A contains ten very short answer questions and four assertion reasoning MCQs of 1 mark each; Section B has two case based questions of 4 marks each    (4)Section C contains nine short answer questions of 2 marks each, Section D contains five short answer questions of 3 marks each and Section E contains three long answer questions of 5 marks each.                                                   SECTION A Q1Define the term 'Reductionism'. Q2 Write the dimensional formula corresponding to(i)Photon(ii)Calorie? Q3 What is unified field theory? Q4 If x=a+bt²+ct³,where x is in metres and t in seconds, what is the dimensional formula of 'c'? Q5 Write two uses of v-t graph? Q6 Can  the relativ

ANNUAL EXAMINATION 2021 CLASS 11TH  PHYSICS TIME 3:00Hrs            MAXIMUM  MARKS  70 General Instructions: (1) All questions are compulsory. There are 33 questions in all.  (2) This question paper has five sections: Section A, Section B, Section C, Section D and Section E. (3) Section A contains ten very short answer questions and four assertion reasoning MCQs of 1 mark each; Section B has two case based questions of 4 marks each    (4)Section C contains nine short answer questions of 2 marks each, Section D contains five short answer questions of 3 marks each and Section E contains three long answer questions of 5 marks each.                                                   SECTION A Q1Define the term 'Reductionism'. Q2 Write the dimensional formula corresponding to(i)Photon(ii)Calorie? Q3 What is unified field theory? Q4 If x=a+bt²+ct³,where x is in metres and t in seconds, what is the dimensional formula of 'c'? Q5 Write two uses of v-t graph? Q6 Can  the relative

AIM:To Determine the refractive index of a glass slab using travelling microscope APPARATUS REQUIRED: A glass slab,a travelling microscope,and Lycopodium powder(fine chalk powder) THEORY: Due to the phenomenon of refraction of light through the glass slab ,there is variation in the real depth and apparent depth of the glass slab.The apparent depth  of the glass slab is less than the real depth of the glass slab. The refractive index of the glass slab is given by   Refractive index  =Real Depth/Apparent depth OBSERVATIONS: Vernier constant of the travelling microscope is 0.001cm or 0.01mm. Observation Table: RESULT: The refractive index of the material of the glass slab is 1.403 PRECAUTIONS: 1)The microscope should be carefully focussed. 2)The microscope screw should be moved only in one direction to avoid backlash error. 3)The powder should be spread on the top of the slab. 4)The particles used should be very fine and a thin layer should