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Solved Electricity numerical for class 10

Question: Two bulbs have ratings 100 W, 220 V and 60 W, 220 V respectively. Which one has a greater resistance ? Answer: P=VI=  V 2 /R For the same V, R is inversely proportional to P. Therefore, the bulb 60 W, 220 V has a greater resistance. Question: A torch bulb has a resistance of  1 Ω  when cold. It draws a current of 0.2 A from a source of 2 V and glows. Calculate (i) the resistance of the bulb when glowing and (ii) explain the reason for the difference in resistance. Answer: (i) When the bulb glows: V = I R ---- Ohm's law R = V/I = 2/.2 = 10  Ω (ii) Resistance of the filament of the bulb increases with increase in temperature. Hence when it glows its resistances is greater than when it is cold. Question: Calculate the resistance of 1 km long copper wire of radius 1 mm. (Resistivity of copper = 1.72 x  1 0 -8 Answer: L = 1 km = 1000 m R = 1 mm = 1 x  1 0 -3 A = p r 2 Question: When a potential difference of 2 V is applied across the ends o

ctet 2011 sample paper (Child Development and Pedagogy

CBSE ADDA Teacher Eligibility Test (TET) would be conducted in June 2011 and there would be around 30 questions on Child Development and Pedagogy and below are some questions on the same section. 1. Absenteeism can be tackled by : (1) teaching (2) punishing the students (3) giving the sweets (4) contacting the parents 2. Discipline means: (1) strict-behaviour (2) severe punishment (3) obedience (4) going by the rules 3. If any girl child does not corne to school regularly you will (1) no bother (2) struck off her name (3) complain to the Principal (4) meet the parents and en- courage them . 4. In co-education you want't to : (1) make separate rows of boys and girls (2) you give preference to boys over girls (3) you. give preference to none (4) you deal according to need 5. One of the basic priniclples of socializing Individuals is : (1) religion (2) caste (3) educational (4) imitation Directions (6-10) : Which of the' skills do you co

CTET : Aim of School Based CCE

CBSE ADDA Aim of School Based CCE 􀂄 Elimination of chance element and subjectivity (as far as possible), de-emphasis on memorization, encouraging comprehensive evaluationincorporating both Scholastic and Co-Scholastic aspects of learners development 􀂄 Continuous evaluation spread over the total span of the instructional time as an integral built-in aspect of the total teaching-learning process 􀂄 Functional and meaningful declaration of results for effective use by teachers, students, parents and the society 􀂄 Wider uses of test results for purposes not merely of the assessment of levels of pupils’ achievements and proficiencies, but mainly for their improvement, through diagnosis and remedial/enrichment programmes 􀂄 Improvement in the mechanics of conducting examinations for realizing a number of other allied purposes 􀂄 Introduction of concomitant changes in instructional materials and methodology 􀂄 Introduction of the semester system. 􀂄 The use of grades i