Physics Semester-1 ISC Answer Key 2021 Class-12 . Step by step Answer Key of ISC Class-12 Paper Solution. During solutions of semester-1 Physics examination paper we explain with figure , graph, table whenever necessary so that student can achieve their goal in next upcoming exam of council. Visit official website CISCE for detail information about ISC Board Class-12.
Physics Semester-1 ISC Answer Key 2021 Class-12
| Board | ISC |
| Class | 12th (XII) |
| Subject | Physics |
| Topic | Answer Key |
| Syllabus | on bifurcated syllabus (after reduction) |
| session | 2021-22 |
| Question Type | MCQ/ Objective (as prescribe by council) |
| Total question |
Total-50 |
| Max mark |
80 |
Physics Sem-1 ISC Paper Answer Key 2021 Class-12
Question 1: The force between ……………… force would be.
Answer : Option (a) F is correct
Question 2: Which one ………… of force
Answer : Option (c) They intersect each other is correct
Question 3: Electric ………….. dipole is
Answer : Option (c) Inversely propositional to square of the distance is correct
Question 4: The electric ……………… flux would
Answer : Option (d) Remain (Φ) is correct
Question 5: An electric ………………. dipole is
Answer : Option (d) 4Nm is correct
Question 6: Three point ………………. equal to
Answer : Option (c) -Q/2 is correct
Question 7: Consider ………. At point P.
Answer : Option (d) Electric potential is zero is correct
Question 8: Consider 10 ………….. form them
Answer : Option (b) 1 : 100
Question 9: The capacitance ………….. depend on
Answer : Option (b) Potential difference between the two plates
Question 10: The surface ……………. sheet is
Answer : Option (d) 1 x 106 NC-1
Question 11: A metallic ………… becomes
Answer : Option (a) 16 R
Question 12: Specific …………… depends on
Answer : Option (d) Temperature of the wire
Question 13: Two electric ………….. ratio
Answer : Option (c) 2 : 1
Question 14: When a ………….. wire is
Answer : Option (a) 5 x 10-7 Ωm
Question 15: SI unit ………. is
Answer : Option (c) Ω1 M1
Question 16: If a variable ………….. R is :
Answer : Option (d) is correct
Question 17: A battery ,…………… emf is .
Answer : Option (b) 2·25V is correct
Question 18: N identical ………….. is :
Answer : Option (c) MNe/(MR+Nr) is correct
Question 19: Kirchoff ………. of :
Answer : Option (b) charge is correct
Question 20: Wheatstone …………… measure
Answer : Option (a) Resistance of a wire is correct
Question 21: In a ……………. will be
Answer : Option (b) 30.0 cm is correct
Question 22: If potential ………. wire is
Answer : Option (b) 30.0 cm is correct
Question 23: In the …………… is
Answer : Option (a) 0 is correct
Question 24: An electrical …………….. current of:
Answer : Option (c) 0.50 A is correct
Question 25: SI unit of ………… moment is:
Answer : Option (b) Am² is correct
Question 26: The point ………………… below.
Answer : Option (a) 1·6 x 10-6 T directed into the paper. is correct
Question 27: A proton ………………. when theta is
Answer : Option (d) Zero is correct
Question 28: Magnetic ………… given by:
Answer : Option (c) μ𝑁𝐼/l is correct
Question 29: Two long ………………. 2 below.
Answer : Option (b) move towards the wire P. is correct
Question 30: Two coil ………….. depend on.
Answer : Option (d) Voltage applied to the coil P or Q is correct
Question 31: Which of the ………………. circuit ?
Answer : Option (c) Current in the circuit is minimum is correct
Question 32: A graph ………. source of
Answer : Option (c) is correct
Question 33: The graph between …………. cycle is
Answer : Option (a) Zero is correct
Question 34: If potential difference …………….. is :
Answer : Option (c) 1000 W is correct
Question 35: Which one of ……………. vacuum.
Answer : Option (c) gamma rays is correct
Question 36: Consider ……………… frequency ?
Answer : Option (b) ultraviolet radiations is correct
Question 37: Which one of the ………….. radiations.
Answer : Option (d) Thermopile is correct
Question 38: Which one of the …………… salt ?
Answer : Option (b) X-Ray is correct
Question 39: The ……………….. YZ plane
(i) What is the ……………..
Answer : Option (a) The electric field is along x-axis. is correct
(ii) An electric ……………..
Answer : Option (a) 2𝑞𝑙E is correct
Question 40: A capacitor …………….. 1000V.
(i) Electrostatic ……………..
Answer : Option (d) 5·0J is correct
(ii) If a slab……………..
Answer : Option (c) 50 µF is correct
Question 41: With reference ……….. conductor
(i) Drift ……………
Answer : Option (a) The average velocity of free electrons with which they move towards the
positive terminal. is correct
(i) Relaxations ……………
Answer : Option (b) the average time interval between two successive collisions of a free electron with metallic ions in a conductor is correct.
Question 42: Consider ………………. at rest.
(i) The bar …………… G.
Answer : Option (c) shows a momentary deflection and comes b is correct.
(ii) If the bar …………… G.
Answer : Option (c) shows a momentary and a greater deflection and comes back to zero. is correct.
Question 43: Consider a ………….. 0.1Ω
(i) To convert ………….
Answer : Option (d) R2 is connected in parallel with G is correct.
(ii) To convert ………….
Answer : Option (a) R1 is connected in series with G is correct.
Question 44: A solenold having …………….. 0.2 is
(i) Magnitude ……………..
Answer : Option (c) 200V is correct.
(ii) If the switch ……………..
Answer : Option (b) More than that in part (A) is correct.
Question 45: The circuit diagram ………………
(i) To find ……………..
Answer : Option (c) K1 is closed firs is correct.
(ii) working formula to ………………
Answer : Option (a) is correct.
(iii) If the value ……………
Answer : Option (b) Balancing length l2 increases. is correct.
Question 46: When a capacitor ……………..
(i) Average power ………………….
Answer : Option (d) Zero is correct.
(ii) Phase difference ……………
Answer : Option (b) 180 is correct.
(iii) Current ………………
Answer : Option (a) XL = Xc is correct.
Question 47: X and Y are two ……………………….
(i) Magnetic field ……………….
Answer : Option (a) 7·5 x 10-4 T is correct.
(ii) Magnetic field ……………….
Answer : Option (d) 1 x 10-3T is correct.
(iii) Resultant magnetic ………………..
Answer : Option (b) 2·5 x10-4T is correct.
Question 48: With reference to a ……………
(i) The principle of ………………….
Answer : Option (b) Mutual induction is correct.
(ii) In an actual ………………
Answer : Option (d) Output power is always less than input power is correct.
(iii) For a step ……………….
Answer : Option (a) Output voltage is greater than input voltage is correct.
Question 49: A 220V. ………………… Then.
(i) Reactance of the ……………….
Answer : Option (a) 1000 Ω is correct.
(ii) Reactance ……………
Answer : Option (c) 200 Ω is correct.
(iii) Impedance ……………….
Answer : Option (b) 1000 Ω is correct.
(iv) Plane difference ………………
Answer : Option (a) 53 with current leading over supply voltage is correct.
Question 50: A school …………. our daily life.
(i) Voltage ………………..
Answer : Option (b) ac voltage and dc voltage respectively is correct.
(ii) Ac voltage ………………..
Answer : Option (a) 50 Hz is correct.
(iii) Which one of the ……………….
Answer : Option (a) ac voltage can be stepped up or down is correct.
(iv) Refer to graph …………….
Answer : Option (c)G1 represents ac voltage is correct.
-: End of Physics Semester-1 ISC Answer Key 2021 Class-12 :-
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