Board Paper of Class 12-Science 2023 Physics Delhi(Set 2) - 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
A charge Q is placed at the centre of a cube. The electric flux through one if its face is
(A)
(B)
(C)
(D) VIEW SOLUTION
- Question 2
Two long parallel wires kept 2 m apart carry 3A current each, in the same direction. The force per unit length on one wire due to the other is
(A) 4.5 × 10–5, attractive
(B) 4.5 × 10–7, N/m, repulsive
(C) 9 × 10–7, N/m, repulsive
(D) 9 × 10–5 N/m, attractive VIEW SOLUTION
- Question 3
Which of the following has its permeability less than that of free space?
(A) Copper
(B) Aluminium
(C) Copper chloride
(D) Nickel 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
Choose the correct option related to wavelengths (λ) of different parts of electromagnetic spectrum.
(A)
(B)
(C)
(D) 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
- 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
During the formation of a p-n junction:
(A) diffusion current keeps increasing.
(B) drift current remains constant.
(C) both the diffusion current and drift current remain constant.
(D) diffusion current remains almost constant but drift current increases till both currents become equal. 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
Figure shows a plot of stopping potential (V0) versus where λ is the wavelength of the radiation causing photoelectric emission from a surface. The slop of the line is equal to
(A) ϕ0
(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
An ideal inductor is connected across an AC source of voltage. The current in the circuit
(A) is ahead of the voltage in phase by π.
(B) lags voltage in phase by π.
(C) is ahead of voltage in phase by
(D) lags voltage in phase by . VIEW SOLUTION
- Question 14
According to Huygens principle, the amplitude of secondary wavelets is
(A) equal in both the forward and the backward directions.
(B) maximum in the forward direction and zero in the backward direction.
(C) large in the forward direction and small in the backward direction.
(D) small in the forward direction and large in the backward direction. 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) : In insulators, the forbidden gap is very large.
Reason (R) : The valence electrons in an atom of an insulator are very tightly bound to the nucleus.
(A) Both Assortion (A) and Reason (R) are true and (R) is the correct explanation of (A).
(B) Both Assertion (A) and Reason (R) are true and (R) is NOT the correct explanation of (A).
(C) Assertion (A) is true and Reason (R) is false.
(D) Assertion (A) is false and Reason (R) is also false. VIEW SOLUTION
- Question 17
Assertion (A) : The equivalent resistance between points A and B in the given network is 2R.
Reason (R) : All the resistors are connected in parallel.
(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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