Board Paper of Class 12 Physics Term-I 2021 Delhi(SET 4) (Series: SSJ/2)- Solutions
(i) This question paper contains 55 questions out of which 45 questions are to be attempted. All questions carry equal marks.
(ii) The question paper consists of three Sections - Section A, B and C.
(iii) Section - A contains 25 questions. Attempt any 20 questions from Q. No. 01 to 25.
(iv) Section - B contains 24 questions. Attempt any 20 questions from Q. No. 26 to 49.
(v) Section - C contains 6 questions. Attempt any 5 questions from Q. No. 50 to 55.
(vi) The first 20 Questions attempted in Section - A & Section - B and first 5 questions attempted in
(vii) There is only one correct option for every multiple choice question (MCQ).
Marks will not be awarded for answering more than one option.
(viii) There is no negative marking.
- Question 1
A negatively charged object X is repelled by another charged object Y.
VIEW SOLUTION
However an object Z is attracted to object Y. Which of the following is the most possibility for the object Z?
(a) positively charged only
(b) negatively charged only
(c) neutral or positively charged
(d) neutral or negatively charged
- Question 2
In an experiment three microscopic latex spheres are sprayed into a chamber and became charged with charges +3e, +5e and –3e respectively.
All the three spheres came in contact simultaneously for a moment and got separated. Which one of the following are possible values for the final charge on the spheres?
(a) +5e, –4e, +5e
(b) +6e, +6e, –7e
(c) –4e, +3.5e, +5.5e
(d) +5e, –8e, +7e VIEW SOLUTION
- Question 3
An object has charge of 1 C and gains 5.0 × 1018 electrons. The net charge on the object becomes-
(a) –0.80 C
(b) +0.80 C
(c) +1.80 C
(d) +0.20 C VIEW SOLUTION
- Question 4
Kirchhoff's first rule ∑I = 0 and second rule ∑IR = ∑E (where the symbols have their usual meanings) are respectively based on-
(a) conservation of momentum and conservation of charge
(b) conservation of energy, conservation of charges
(c) conservation of charge, conservation of momentum
(d) conservation of charge, conservation of energy VIEW SOLUTION
- Question 5
The electric power consumed by a 220 V – 100 W bulb when operated at 110 V is
(a) 25 W
(b) 30 W
(c) 35 W
(d) 45 W VIEW SOLUTION
- Question 6
Which of the following has negative temperature coefficient of resistivity?
(a) metal
(b) metal and semiconductor
(c) semiconductor
(d) metal and alloy VIEW SOLUTION
- Question 7
Two wires carrying currents I1 and I2 lie, one slightly above the other, in a horizontal plane as shown in figure. The region of vertically upward strongest magnetic field is
(a) I
(b) II
(c) III
(d) IV VIEW SOLUTION
- Question 8
Two parallel conductors carrying current of 4.0 A and 10.0 A are placed 2.5 cm apart in vacuum. The force per unit length between them is–
(a) 6.4 × 10–5 N/m
(b) 6.4 × 10–2 N/m
(c) 4.6 × 10–4 N/m
(d) 3.2 × 10–4 N/m VIEW SOLUTION
- Question 9
If an ammeter is to be used in place of a voltmeter, then we must connect with the ammeter a–
(a) low resistance in parallel
(b) low resistance in series
(c) high resistance in parallel
(d) high resistance in series VIEW SOLUTION
- Question 10
The magnetic field at the centre of a current carrying circular loop of radius R, is B1. The magnetic field at a point on its axis at a distance R from the center of the loop is B2. Then the ratio (B1/B2) is
(a)
(b)
(c)
(d) 2 VIEW SOLUTION
- Question 11
The self-inductance of a solenoid of 600 turns is 108 mH. The self-inductance of a coil having 500 turns with the same length, the same radius and the same medium will be
(a) 95 mH
(b) 90 mH
(c) 85 mH
(d) 75 mH VIEW SOLUTION
- Question 12
The rms current in a circuit connected to a 50 Hz ac source is 15 A. The value of the current in the circuit s after the instant the current is zero, is–
(a)
(b)
(c)
(d) 8 A VIEW SOLUTION
- Question 13
In a circuit the phase difference between the alternating current and the source voltage is . Which of the following cannot be the element(s) of the circuit?
(a) only C
(b) only L
(c) L and R
(d) L or C VIEW SOLUTION
- Question 14
The electric potential V at any point (x, y, z) is given by V = 3x2 where x is in metres and V in volts. The electric field at the point (1 m, 0, 2m) is –
(a) 6 V/m along –x-axis
(b) 6 V/m along +x-axis
(c) 1.5 V/m along –x-axis
(d) 1.5 V/m along +x-axis VIEW SOLUTION
- Question 15
Which of the diagrams correctly represents the electric field between two charged plates if a neutral conductor is placed in between the plates?
(a)
(b)
(c)
(d) VIEW SOLUTION
- Question 16
A variable capacitor is connected to a 200 V battery. If its capacitance is changed from 2 μF to X μF, the decrease in energy of the capacitor is 2 × 10–2J. The value of X is –
(a) 1 μF
(b) 2 μF
(c) 3 μF
(d) 4 μF VIEW SOLUTION
- Question 17
A potential difference of 200 V is maintained across a conductor of resistance 100 Ω. The number of electrons passing through it in 1s is
(a) 1.25 × 1019
(b) 2.5 × 1018
(c) 1.25 × 1018
(d) 2.5 × 1016 VIEW SOLUTION
- Question 18
- Question 19
When an alternating voltage is applied to a circuit, a current flows through it. The average power dissipated in the circuit is
VIEW SOLUTION
(a)
(b)
(c)
(d) Zero
- Question 20
A current carrying wire kept in a uniform magnetic field, will experience a maximum force when it is
(a) perpendicular to the magnetic field
(b) parallel to the magnetic field
(c) at an angle of 45° to the magnetic field
(d) at an angle of 60° to the magnetic field VIEW SOLUTION
- Question 21
The voltage across a resistor, an inductor, and a capacitor connected in series to an ac source are 20 V, 15 V and 30 V respectively. The resultant voltage in the circuit is
(a) 5 V
(b) 20 V
(c) 25 V
(d) 65 V VIEW SOLUTION
- Question 22
In a dc circuit the direction of current inside the battery and outside the battery respectively are –
(a) positive to negative terminal and negative to positive terminal
(b) positive to negative terminal and positive to negative terminal
(c) negative to positive terminal and positive to negative terminal
(d) negative to positive terminal and negative to positive terminal VIEW SOLUTION
- Question 23
The magnitude of electric field due to a point charge 2q, at distance r is E. Then the magnitude of electric field due to a uniformly charged thin spherical shell of radius R with total charge q at a distance will be
(a)
(b) 0
(c) 2E
(d) 4E
VIEW SOLUTION
- Question 24
The horizontal component of earth's magnetic field at a place is 0.2 G whereas it's total magnetic field is 0.4 G. The angle of dip at the place is
(a) 30°
(b) 45°
(c) 60°
(d) 90° VIEW SOLUTION
- Question 25
The current in the primary coil of a pair of coils changes from 7 A to 3 A in 0.04 s. The mutual inductance between the two coils is 0.5 H. The induced emf in the secondary coil is -
(a) 50 V
(b) 75 V
(c) 100 V
(d) 220 V VIEW SOLUTION
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