XI Physics Unit Test 2024-25.pdf

D. B. F. Dayanand College of Arts and Science, Solapur. Unit Test –I (2024-25) (Arts, Science and M.C.V.C) Std: XI (Science) Time : 1 Hrs Sub: PHYSICS (54)...

D. B. F. Dayanand College of Arts and Science, Solapur. Unit Test –I (2024-25) (Arts, Science and M.C.V.C) Std: XI (Science) Time : 1 Hrs Sub: PHYSICS (54) Max. Marks :25 : Note:- 1) Use of Log table is allowed. 2) Each section should be written on new page. 3) Draw diagrams wherever necessary. 4) Symbols and units have their usual meanings unless it is specified. 5) Figures to the right indicate full marks SECTION -A Q.1 Select and write the most appropriate answer from the given (4) alternatives for each sub question questions (each carry 1marks ) i. Which of the following ng is not a fundamental unit? a) Candela b) Steradian c) Mole d) Coulomb ii. Dimensions of K.E. are same as _________. a) Force b) Acceleration c) Work d) Pressure iii. As per recent understanding light consists of _________. a) Rays b) Waves c) Corpuscles d) Photons obeying the rules of waves iv. The critical angle for commonly used glass of refr refractive active index (RI) 1.5 is __. a) 49 b) 42 c) 45 d) 46 Q. 2 Answer the following questions (each carry 1 mark ) (3) i. Define derived quantities of physical quantity. ii. State the significant figures of the following numbers a) 0.001257 b) 9.1 × 10 iii. Define focal power of spherical mirrors.  SECTION –B Attempt any FOUR of the following questions (each carry 2 marks ) (8) Q.3 Write the dimension of 1) Momentum 2) Angle Q.4 Check the correctness of given physical equation. 𝑆 = 𝑢𝑡 + 𝑎𝑡 using dimensional analysis. Q.5 Write the order of magnitude of the following numbers 1) 6.4 × 10 𝑚 2) 1.6 × 10 𝐶 Q.6 What are the requirements of good units? Q.7 Draw a ray diagram showing the focal length of convex mirror is positive. Q.8 With the help of neat labeled diagram explain the construction and working of an optical fibre. SECTION –C Attempt any TWO of the following questions (each carry 3 marks ) (6) Q.9 Find the conversion factor between the unit of energy form S.I. system into C.G.S. system. Q.10 Find the percentage error in kinetic energy of a body having mass (m) 60 ± 0.3 𝑔 moving with a velocity (v) 25 ± 0.1cm/s. Q.11 Explain with neat labeled diagram about the total internal reflection. SECTION –D Attempt any ONE of the following questions (each carry 4 marks ) (4) Q.12 Derive the formula for kinetic energy of a body having mass (m) moving with a velocity (v) using dimension analysis. Q.13 The spherical surface separates two media. Derive the expression that relates object distance (u), image distance (v) with radius of curvature (R) for a point object. ***