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All Physics 12 papers

Class 12 · Past paper

Physics 12 past paper 2022

85 published questions in this index. The full practice view lets you work through them and track your own attempts.

31 MCQs54 written questionsPractise this paper

Question index

1
Work done in moving a charge of $6\text{ C}$ between two points is $10\text{ J}$. What is the potential difference between two points?
MCQ1 marksannualElectric Potential And Capacitor
2
Four charges $+Q, -Q, +Q, -Q$ are placed at the corners of a square taken in order. At the centre of the square:
MCQ1 marksannualElectric Potential And Capacitor
8
The capacitive reactance in a pure capacitive D.C circuit is:
MCQ1 marksannualAlternating Current
8

This is a skimmable index, not a replacement for the study surface. Open the practice view to answer questions and use the linked study material.

The current in a coil of inductance $5\text{ H}$ decreases at the rate of $2\text{ A/s}$. The induced e.m.f is:

MCQ1 marksannualAlternating Current

2

The energy of an electron which accelerates through a potential difference of $1000 \text{ V}$ is:

MCQ1 marksannualQuantum Physics

13

Which particle has the shortest wavelength, if all are having the same velocity?

MCQ1 marksannualQuantum Physics

15

The energy of the electron in the excited state $n=3$ in hydrogen atom is:

MCQ1 marksannualQuantum Physics

15

If an electron jumps from second orbit to first orbit in hydrogen atom, it emits a photon of:

MCQ1 marksannualQuantum Physics

18

What is the wavelength of the second line of the Paschen Series?

Part B3 marksannualQuantum Physics

1

A point charge $+q$ is placed at the centre of a cube of side '$a$'. The electric flux emerging from the cube is:

MCQ1 marksannual

1

Explain why the capacitance of a parallel plate capacitor increases when a dielectric slab is placed between its plates?

Part B3 marksannual

1

State the principle of an A.C generator. Explain by sketching a graph how an A.C generator is used to produce an alternating current.

Part C5 marksannual

1

Why is it safe to stay inside an automobile during a light storm?

Part B3 marksannual

1

Describe the process of charging and discharging of a capacitor by sketching the graphs for the growth and decay of charge on the capacitor.

Part C5 marksannual

2

Is **E** necessarily zero inside a charged rubber balloon, if balloon is spherical? Assume that charge is distributed uniformly over the surface.

Part B3 marksannual

2

A current carrying loop is placed in a magnetic field. Derive an expression for the torque acting on it.

Part C4 marksannual

2

Two charges $5 \times 10^{-8}\text{ C}$ and $-3 \times 10^{-8}\text{ C}$ are located $16\text{ cm}$ apart. At what point on the line joining the two charges is electric potential z…

Part B3 marksannual

2

State **Ampere's Law**. Derive an expression for the magnetic field due to a current carrying solenoid.

Part C4 marksannual

3

A wire of uniform cross-sectional area '$A$' and length '$L$' is cut into two equal parts. The resistance of each part becomes:

MCQ1 marksannual

3

Why is the e.m.f of a cell always greater than its terminal voltage?

Part B3 marksannual

3

Describe **hysteresis loop** for a magnetic material by drawing its curve for iron.

Part C4 marksannual

3

Describe a circuit which will give a continuously varying potential.

Part B3 marksannual

3

A long solenoid with $15\text{ turns per cm}$ has a small loop of area $2.0\text{ cm}^2$ placed inside the solenoid normal to its axis. If the current carried by the solenoid chang…

Part C4 marksannual

4

The maximum output power is delivered to a load resistance '$R$', when the internal resistance '$r$' of the source is equal to:

MCQ1 marksannual

4

What is **Wheatstone bridge**? Deduce the condition for which Wheatstone bridge is balanced?

Part B3 marksannual

4

Derive a relation for impedance and resonant frequency in an R.L.C series A.C circuit.

Part C5 marksannual

4

State and prove **maximum power transfer theorem**.

Part B3 marksannual

4

State the term **impedance** for an A.C circuit. Derive an expression for the impedance of R.L.C series A.C circuit. State the condition of resonance.

Part C5 marksannual

5

The unit of magnetic flux density is:

MCQ1 marksannual

5

How can one separate particles of different velocities moving in a magnetic field?

Part B3 marksannual

5

State **Gauss's law** for electrostatics. Using Gauss's Law, derive a relation for the electric field intensity at a point due to a uniformly charged infinite plane sheet.

Part C4 marksannual

5

The unit of magnetic flux is:

MCQ1 marksannual

5

Will the two long, straight parallel wires carrying current in opposite direction attract or repel each other? Explain briefly.

Part B3 marksannual

5

What are **X-rays**? Discuss how inner shell transitions in heavy elements result into emission of characteristic X-rays.

Part C4 marksannual

6

Work done on a charged particle moving in a uniform magnetic field is:

MCQ1 marksannual

6

A copper wire of diameter $1.6 \text{ mm}$ carries a current of $20 \text{ A}$. Find maximum magnitude of magnetic field due to this current.

Part B3 marksannual

6

The working principle of galvanometer is based upon:

MCQ1 marksannual

6

What is a galvanometer? How is a 5 mA, 100 Ω galvanometer converted into a 20 V voltmeter?

Part B3 marksannual

7

When carrying electricity on long distances, step-up transformers are used to:

MCQ1 marksannual

7

How are **eddy currents** produced in an iron core of transformer and how can they be minimized?

Part B3 marksannual

7

What is a **nuclear reactor**? Give the principle, construction and working of a typical nuclear reactor.

Part C7 marksannual

7

If the motor is overloaded then the magnitude of back e.m.f:

MCQ1 marksannual

7

Can an efficient step up transformer increase the power level?

Part B3 marksannual

7

State the photoelectric effect. Discuss experimental results and photon theory of the photoelectric effect.

Part C7 marksannual

8

An induced e.m.f has no direction of its own. Explain briefly.

Part B3 marksannual

8

State the postulates of special theory of relativity. Discuss time dilation and length contraction as a consequence of special theory of relativity.

Part C6 marksannual

8

State and prove the second postulate of Bohr Model of Hydrogen atom.

Part B3 marksannual

8

What is meant by **nuclear fusion**? Discuss how can energy be released in the fusion process? Illustrate with an example of proton-cycle.

Part C6 marksannual

9

An electromagnetic wave is generated by:

MCQ1 marksannual

9

When an A.C source is connected to an ideal inductor, show that the average power supplied by the source over a complete cycle is zero.

Part B3 marksannual

9

The phase difference between the current and voltage at resonance in R.L.C series A.C circuit is:

MCQ1 marksannual

9

Prove that an ideal capacitor connected to an A.C source does not dissipate power.

Part B3 marksannual

10

If both the length and radius of the rod are doubled, then modulus of elasticity will:

MCQ1 marksannual

10

What is the basic principle of generation of electromagnetic waves?

Part B3 marksannual

10

A body which breaks down just after crossing the elastic limit is known as:

MCQ1 marksannual

10

In an R.L series A.C circuit, will the current lag or lead the voltage? Illustrate your answer by a phasor diagram.

Part B3 marksannual

11

Briefly explain the working principle of magnetic levitation train.

Part B3 marksannual

11

Which factor does not affect the conductivity of a PN junction diode?

MCQ1 marksannual

11

Differentiate between **paramagnetic**, **diamagnetic** and **ferromagnetic** materials with suitable examples.

Part B3 marksannual

12

In transistor, the emitter current $I_{E}$ is $3.5 \text{ A}$ and collector current $I_{C}$ is $2.35 \text{ A}$. What will be the base current?

MCQ1 marksannual

12

Why charge carriers are not present in the depletion region?

Part B3 marksannual

12

Photon $A$ has twice the energy of photon $B$. What is the ratio of the momentum of $A$ to that of $B$?

MCQ1 marksannual

12

Draw and explain the stress-strain curve for a ductile material.

Part B3 marksannual

13

How are PN-junction diodes used in a full-wave rectifier?

Part B3 marksannual

13

Pair production occurs only when energy of photon is at least equal to:

MCQ1 marksannual

13

What is the working principle of magnetic levitation train? Explain how can it acquire high speed?

Part B3 marksannual

14

If an object moves with speed of light, its mass will be:

MCQ1 marksannual

14

What is a transistor? Discuss the operation of NPN transistor.

Part B3 marksannual

14

Which of the following series of hydrogen spectra lies in the ultraviolet region of the spectrum?

MCQ1 marksannual

14

Why is transistor called current amplification device?

Part B3 marksannual

15

What is meant by **wave-particle duality**? Explain on the basis of de-Broglie hypothesis.

Part B3 marksannual

15

Explain how a PN junction diode acts as a half wave rectifier?

Part B3 marksannual

16

The process of generating three dimensional image of the object using laser beam is called:

MCQ1 marksannual

16

Calculate the shortest and longest wavelength of radiation for the Brackett Series.

Part B3 marksannual

16

The quantity of uranium is $400\text{ g}$, the amount of uranium left after three half-lives is:

MCQ1 marksannual

16

Deduce the relation between $\alpha$ and $\beta$ of a transistor.

Part B3 marksannual

17

Mass equivalent of $931 \text{ MeV}$ energy is:

MCQ1 marksannual

17

How can the spectrum of hydrogen contain so many lines even though a hydrogen atom has only a single electron?

Part B3 marksannual

17

The particles that experience strong nuclear force are:

MCQ1 marksannual

17

The life time of electron in the excited state is about $10^{-8}\text{ s}$. What is the uncertainty in energy during this time?

Part B3 marksannual

18

Describe the construction and working of Helium-Neon Laser.

Part B3 marksannual

19

The mass of $^{14}_{7}N$ nucleus is $13.999234 \text{ u}$. Calculate its binding energy. Given that Mass of Proton $= 1.007276 \text{ u}$ and Mass of Neutron $= 1.008665 \text{ u}$…

Part B3 marksannual

19

What factors make a fusion reaction difficult to achieve?

Part B3 marksannual

20

How can energy be released in the nuclear fusion process?

Part B3 marksannual

20

Find the energy released when $\beta$-decay changes $^{234}_{90}Th$ into $^{234}_{91}Pa$. Given that Mass of $^{234}_{90}Th = 234.0436u$, Mass of $^{234}_{91}Pa = 234.0428u$ and Ma…

Part B3 marksannual

Physics 12 Past Paper 2022 | Notely