PYQ Bank - EduGrown

CBSE

#1 Class Class 12 Physics Current Electricity 2025 Short 5M

(i) Derive the condition for which a Wheatstone Bridge is balanced. () (ii) 20C 1.05 100C 1.38 (a)

👁 View Answer

👍 0 👎 0

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

CBSE

#2 Class Class 12 Physics Current Electricity 2025 Mcq 1M

A square loop of side 0.50 m is placed in a uniform magnetic field of 0.4 T perpendicular to the plane of the loop. The loop is rotated through an angle of 60 in 0.2 s. The value of emf induced in the loop will be :

A. 5V

B. 3.5 V

C. 2.5 V

D. Zero V

👁 View Answer

👍 0 👎 0

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

CBSE

#3 Class Class 12 Physics Current Electricity 2025 Short 2M

A square loop of side 10 cm, free to rotate about a vertical axis coinciding with its one arm, is initially held perpendicular to a uniform horizontal magnetic field of 0.2 T. If it is rotated at the uniform speed of ...

👁 View Answer

👍 0 👎 0

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

CBSE

#4 Class Class 12 Physics Current Electricity 2025 Short 5M

(i) Consider a cylindrical conductor of length l and area of cross-section A. Current I is maintained in the conductor and electrons drift with velocity vd ( v d = ), (where symbols have their usual meanings). Show th...

👁 View Answer

👍 0 👎 0

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

CBSE

#5 Class Class 12 Physics Current Electricity 2025 Short 2M

(i) its resistance, and (ii) heat produced by it in 10 minutes. (a) An electric iron rated 2.2 kW, 220 V is operated at 110 V supply. Find : 2 (b) A current of 4.0 A flows through a wire of length 1 m and cross-sectio...

👁 View Answer

👍 0 👎 0

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

CBSE

#6 Class Class 12 Physics Current Electricity 2025 Mcq 1M

Which of the following statements is not true for electric energy in ac form compared to that in dc form ?

A. Production of ac is economical

B. ac can be easily and efficiently converted from one voltage to the other

C. ac can be transmitted economically over long distances

D. ac is less dangerous. By = ($2 \times 10^{-7}$ T) sin (x + $1.5 \times 10^{11}$ t) (A) 6.0 fm (B) 30 fm (C) 72 fm (D) 150 fm

👁 View Answer

👍 0 👎 0

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

CBSE

#7 Class Class 12 Physics Current Electricity 2025 Short 3M

(a) ‘Current is a scalar quantity, although we represent current with an arrow.’ Explain. (b) Derive the balance condition of a Wheatstone Bridge.

👁 View Answer

👍 0 👎 0

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

CBSE

#8 Class Class 12 Physics Current Electricity 2025 Mcq 1M

A galvanometer of resistance G is converted into a voltmeter of range (0 − V) by connecting a resistor of 250 with it. If resistor of 250 is replaced by another resistor of 900 , its range becomes (0 − 3 V). The resis...

A. (R) (A),

B. ,

C. (A) (A) (R) (R), (A) (B) (A) (R) , (R), (A) (C) (A) , (R) (D) (A) (R)

👁 View Answer

👍 0 👎 0

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

CBSE

#9 Class Class 12 Physics Current Electricity 2025 Mcq 1M

The resistivity of a metal increases with rise in temperature because :

A. only relaxation time ‘’ of electrons decreases with temperature

B. only number of electrons per unit volume ‘n’ increases appreciably

C. ‘’ decreases with temperature but ‘n’ does not change appreciably

D. ‘’ decreases with temperature and ‘n’ increases

👁 View Answer

👍 0 👎 0

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

CBSE

#10 Class Class 12 Physics Current Electricity 2025 Short 3M

(a) The two Kirchhoff ’s rules are based on law of conservation of two physical quantities. Name the quantities. (b) Find magnitude and direction of current in 1 resistor in the given circuit.

👁 View Answer

👍 0 👎 0

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

CBSE

#11 Class Class 12 Physics Current Electricity 2025 Mcq 1M

Which of the following characteristics of electrons determines the current in the conductor ?

A. Drift velocity only

B. Thermal velocity only

C. Both drift velocity and thermal velocity

D. Neither drift nor thermal velocity

👁 View Answer

👍 0 👎 0

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

CBSE

#12 Class Class 12 Physics Current Electricity 2025 Mcq 1M

A wire is gradually stretched to make it 100% longer. Its resistance will increase by :

👁 View Answer

👍 0 👎 0

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

CBSE

#13 Class Class 12 Physics Current Electricity 2025 Short 3M

(i) Derive expression for the emf induced in the loop. (ii) net magnetic force acting on unit length of conductor , due to conductors and . 3 (a) The figure given below shows three straight long parallel conductors an...

👁 View Answer

👍 0 👎 0

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

CBSE

#14 Class Class 12 Physics Current Electricity 2025 Short 3M

State Kirchhoff ’s rules. Using these rules, find the current flowing through branch FC in the given circuit.

👁 View Answer

👍 0 👎 0

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

CBSE

#15 Class Class 12 Physics Current Electricity 2025 Long 1M

Assertion (A) : The work done, in taking a unit charge around a closed loop of an electric circuit involving cells and resistors in the loop, is zero. Reason (R) : The potential at a point depends on the location of t...

👁 View Answer

👍 0 👎 0

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

CBSE

#16 Class Class 12 Physics Current Electricity 2025 Mcq 1M

Two identical conductors 1 and 2 are placed on two frictionless conducting rails R and S in a uniform magnetic field directed vertically downward into the plane of the page. If conductor 1 is moved with a constant vel...

A. −i

B. −j

C. k

D. j

👁 View Answer

👍 0 👎 0

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

CBSE

#17 Class Class 12 Physics Current Electricity 2025 Mcq 1M

Two wires of same length and same area of cross-section but made of different material of resistivities 1 and 2 are connected in series. The equivalent resistivity of the combination is :

👁 View Answer

👍 0 👎 0

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

CBSE

#18 Class Class 12 Physics Current Electricity 2025 Mcq 1M

A metallic rod of 1 m length is rotated with a frequency of 40 rev/s, with one end hinged at the centre and the other end at the circumference of a circular metallic ring of radius 1 m, about an axis passing through t...

A. 20 V

B. 32 V

C. 40 V

D. 63 V

👁 View Answer

👍 0 👎 0

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

CBSE

#19 Class Class 12 Physics Current Electricity 2025 Short 3M

(a) Establish the relation between drift velocity of electrons (vd) and electric current (I) in a conductor. (b) How is vd affected when the length of the conductor is doubled, keeping the voltage applied across the c...

👁 View Answer

👍 0 👎 0

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

CBSE

#20 Class Class 12 Physics Current Electricity 2025 Short 2M

(i) the resistance of the resistor. (ii) the terminal voltage of the battery. (a) In the given figure, a steady current I flows through the circuit when points A and C are connected by a wire of negligible resistance....

👁 View Answer

👍 0 👎 0

+ Add to Paper

✅ Verified by Super Admin

Rate: ★ ★ ★ ★ ★

PYQ Bank & Paper Generator

🔔 Email Updates Lein