Title SAMPLE PAPER(2025) -2.pdf ✅

Page 2 Sample Paper 02 CBSE Physics Class 12 6. At what distance of a point, from a long straight wire carrying a current of 12 A will the magnetic field be equal to 3 10 T5 # - ? (a) 8 cm (b) 16 cm (c) 32 cm (d) 64 cm 7. 1 stat-coulomb = .......... coulomb. (a) 3 109 # (b) 3 10 9 # - (c) 3 1 10 9 # (d) 3 1 10 9 # - 8. When exposed to sunlight, thin films of oil on water often exhibit brilliant colours due to the phenomenon of (a) interference (b) diffraction (c) dispersion (d) polarisation 9. S.I. unit of pole strength is (a) N (b) N A/ - m (c) A m - (d) T 10. To convert mechanical energy into electrical energy one can use (a) D.C. dynamo (b) A.C. dynamo (c) Motor (d) Transformer 11. The waves which can not travel in vacuum are (a) X-rays (b) radio-waves (c) infrasonic waves (d) ultra-violet waves 12. The capacitance of a parallel plate capacitor .......... by the introduction of a dielectric between the plates of capacitor. (a) increases (b) decreases (c) remains same (d) nothing can be said 13. Assertion : A red object appears dark in the yellow light. Reason : The red colour is scattered less. (a) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion. (b) Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion. (c) Assertion is correct but Reason is incorrect. (d) Assertion is incorrect but Reason is correct. 14. Assertion : Radio waves can be polarised. Reason : Sound waves in air are longitudinal in nature. (a) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion. (b) Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion. (c) Assertion is correct but Reason is incorrect. (d) Assertion is incorrect but Reason is correct. 15. Assertion (A) : If the distance between parallel pates of a capacitor is halved and dielectric constant is made three times, then the capacitance becomes six times. Reason (R) : Capacitance of the capacitor does not depend upon the nature of the material of the plates. (a) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion. (b) Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.