Board Paper of Class 12-Science 2023 Physics Delhi(Set 3) - Solutions
Read the following instructions very carefully and follow them:
(i) This question paper comprises 35 questions. All questions are compulsory.
(ii) Question paper is divided into FIVE sections – Section A, B, C, D and E.
(ii) In section A: question number 1 to 18 are Multiple Choice (MCQ) type questions carrying 1 mark each.
(iii) In section B: question number 19 to 25 are Short Answver-1 (SA-1) type questions carrying 2 marks each.
(iv) In section - C: question number 26 to 30 are Short Answer-2 (SA-2) type questions carrying 3 marks each.
(v) In section - D: question number 31 to 33 are Long Answer (LA) type questions carrying 5 marks each.
(vii) In section - E: question number 34 and 35 are case-based questions carrying 4 marks each.
(viii) There is no overall choice. However, an internal choice has been provided in 2 questions in Section B, 2 questions in Section - C, 3 questions in Section - D and 2 questions in Section - E.
(ix) Use of calculators is NOT allowed.
h = 6.63 × 10–34 Js
e = 1.6 × 10–19 C
μo = 4π × 10–7 T m A–1
ε0 = 8.854 × 10–12 C2 N–1 m–2
= 9 × 109 N m2 C–2
Mass of electron (me) = 9.1 × 10–31 kg
Mass of neutron = 1.675 × 10–27 kg
Mass of proton = 1.673 × 10–27 kg
Avogadro’s number = 6.023 × 1023 per gram mole
Boltzmann constant = 1.38 × 10–23 JK–1
- Question 1
An electric dipole of length 2 cm is placed at an angle of 30° with an electric field N/C. It the dipole experiences a torque of Nm, the magnitude of either charge of the dipole, is
(A) 4 μC
(B) 7 μC
(C) 8 mC
(D) 2 mC VIEW SOLUTION
- Question 2
Two horizontal thin long parallel wires, separated by a distance r carry current I each in the opposite directions. The net magnetic field at a point midway between them, will be
VIEW SOLUTION
(a) zero
(b)
(c)
(d)
- Question 3
Which of the following cannot modify an external magnetic field as shown in the figure 3?
(a) Nickel
(b) Silicon
(c) Sodium Chloride
(d) Copper VIEW SOLUTION
- Question 4
A square shaped coil of side 10 cm, having 100 turns is placed perpendicular to a magnetic field which is increasing at 1 T/s. The induced emf in the coil is
(A) 0.1 V
(B) 0.5 V
(C) 0.75 V
(D) 1.0 V VIEW SOLUTION
- Question 5
Which one of the following electromagnetic radiation has the least wavelength?
(A) Gamma rays
(B) Microwaves
(C) Visible light
(D) X-rays VIEW SOLUTION
- Question 6
In a Young's double-slit experiment, the screen is moved away from the plane of the slits. What will be its effect on the following?
(i) Angular separation of the fringes.
(ii) Fringe-width.
(A) Both (i) and (ii) remain constant.
(B) (i) remains constant, but (ii) decreases.
(C) (i) remains constant, but (ii) increases,
(D) Both (i) and (ii) increase. VIEW SOLUTION
- Question 7
E, c and v represent the energy, velocity and frequency of a photon. Which of the following represents its wavelength?
(a)
(b) hv
(c)
(d) VIEW SOLUTION
- Question 8
The ratio of the nuclear densities of two nuclei having mass numbers 64 and 125 is
(A)
(B)
(C)
(D) 1 VIEW SOLUTION
- Question 9
The energy required by an electron to jump the forbidden band in silicon at room temperature is about
(a) 0.01 eV
(b) 0.05 eV
(c) 0.7 eV
(d) 1.1 eV VIEW SOLUTION
- Question 10
The diagram shows four energy level of an electron in Bohr model of hydrogen atom. Identify the transition in which the emitted photon will have the highest energy.
(A) I
(B) II
(C) III
(D) IV VIEW SOLUTION
- Question 11
Which of the following graphs correctly represents the variation of a particle momentum with its associated de-Broglie wavelength?
(A)
(B)
(C)
(D)
VIEW SOLUTION
- Question 12
The capacitors, each of 4 μF are to be connected in such a way that the effective capacitance of the combination is 6 μF. This can be achieved by connecting
(A) All three in parallel
(B) All three in series
(C) Two of them connected in series and the combination in parallel to the third.
(D) we of them connected in parallel and the combination in series to the third. VIEW SOLUTION
- Question 13
What is the ratio of inductive and capacitive reactance in an ac circuit?
(a)
(b) LC2
(c)
(d) VIEW SOLUTION
- Question 14
In an interference experiment, third bright fringe is obtained at a point on the screen with a light of 700 nm. What should be the wavelength of the light source in order to obtain the fifth bright fringe at the same point?
(A) 420 nm
(B) 750 nm
(C) 630 nm
(D) 500 nm VIEW SOLUTION
- Question 15
The radius of the nth orbit in Bohr model of hydrogen atom is proportional to
(A) n2
(B)
(C) n
(D) VIEW SOLUTION
- Question 16
Assertion (A) : The resistance of an intrinsic semiconductor decreases with increase in its temperature.
Reason (R) : The number of conduction electrons as well as hole increase in an intrinsic semiconductor with rise in its temperature.
(A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
(B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
(C) Assertion (A) is true, but Reason (R) is false.
(D) Assertion (A) is false, but Reason (R) is true. VIEW SOLUTION
- Question 17
Assertion(A): The given figure does not show a balanced Wheatstone bridge.
Reason(R): For a balanced bridge small current should flow through the galvanometer.
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false, but Reason (R) is true. VIEW SOLUTION
- Question 18
Assertion (A) : The deflecting torque acting on a current carrying loop is zero when its plane is perpendicular to the direction of magnetic
field.
Reason (R) : The deflecting torque acting on a loop of magnetic moment in a magnetic field is given by the dot product of and .
(A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
(B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
(C) Assertion (A) is true, but Reason (R) is false.
(D) Assertion (A) is false, but Reason (R) is true. VIEW SOLUTION
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