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Physics 12 Past Paper 2024 | Notely

HomePast papersPhysics 122024

All Physics 12 papers

Class 12 · Past paper

Physics 12 past paper 2024

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

13 MCQs36 written questionsPractise this paper

Question index

2
The energy of photon of wavelength $500\text{ nm}$ is:
MCQ1 marksannualQuantum Physics
1
If the velocity of free electron is doubled, its De-Broglie wavelength changes by the factor of:
MCQ1 marksannual
1
What is meant by **'Magnetic Flux'** and **'Magnetic Flux density'**? Also give their units.
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1
State postulates of Bohr's atomic model. Show that energy of the electron in H-atom is quantized.

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.

Part C7 marksannual

2

Why energy dissipated per cycle (magnetization and demagnetization) for steel is more as compared to iron? Explain briefly.

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2

Derive an expression for charge to mass ratio (e/m) for an electron and then calculate its value.

Part C7 marksannual

3

An expression for **current gain** of a transistor is given by:

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3

What is Wien’s displacement law? Explain briefly.

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3

What is **photoelectric effect**? Why classical physics fails to explain photoelectric effect? Derive Einstein photoelectric equation.

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4

For an atom in excited state $n=5$, maximum number of transitions that take place is:

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4

Prove that $E = -\frac{\Delta V}{\Delta r}$.

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4

What is a potentiometer? Explain its principle, construction and working. Also give some uses.

Part C7 marksannual

5

Differentiate between **controlled** and **uncontrolled nuclear chain reactions**. How is the chain reaction controlled?

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5

State and explain Gauss's law. Find electric field intensity between two oppositely charged parallel plates.

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6

In an RLC series circuit, the current at resonance frequency is:

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6

Why in a transistor the base region is made thin and lightly doped?

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6

Explain the phenomenon of self-inductance of a coil. What is its unit? On what factors does self-induction depend?

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7

Distinguish between **N-type semiconductor** and **P-type semiconductor**.

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7

What is an RLC series resonance circuit? Draw its impedance diagram. Also give its properties.

Part C6 marksannual

8

The force acting on a charged particle kept between the plates of a charged capacitor is $F$. If one of the plates of the capacitor is removed, the force on the particle becomes:

MCQ1 marksannual

8

Calculate the longest wavelength of radiation for the Lyman series of hydrogen spectra.

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8

What is meant by **'half-life'** of a radio-active element? Show that $T_{1/2} = 0.693 / \lambda$.

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9

The best instrument for the accurate measurement of emf of a cell is:

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9

Differentiate 'Curie temperature' and 'Critical temperature'.

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10

The AC circuit in which current and voltage are in phase, the power factor is:

MCQ1 marksannual

10

How does a capacitor discharge ignition system work? Enlist some of its uses.

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11

The temperature below which the resistivity of a superconductor falls to zero is called:

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11

Briefly explain **resistivity**. How does it depend on temperature?

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12

How can a galvanometer be converted into a voltmeter? Draw a circuit diagram as well.

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13

Galvanometer is sensitive when the value of $\frac{C}{BAN}$ is:

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13

How are **eddy currents** produced? Identify their heating effects.

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14

With the increase in speed of motor, the magnitude of back emf:

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14

How does a Geiger-Müller counter detect and count radiation?

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15

If $\frac{N_s}{N_p} = 1$ then the transformer is:

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15

In a transformer, why is a laminated iron core used instead of a solid one?

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16

A wire is stretched to double of its length, its **strain** is:

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16

A coil having a resistance of $10\text{ Ohm}$ and an inductance of $32\text{ mH}$ is connected to $220\text{ V}, 50\text{ Hz}$ AC supply. Calculate current passing through the coil…

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17

What is meant by **peak value** and **effective value** of sinusoidal current? Give relation between them.

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18

Differentiate **Paramagnetic** and **Diamagnetic** materials with one example each.

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19

Briefly explain working of transistor as a switch.

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20

What is meant by **meta-stable state** and **population inversion** for LASER action?

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21

Calculate the **De Broglie wavelength** of an electron having $KE = 1200\text{ keV}$.

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22

Discuss the difference between **Hadrons** and **Leptons**.

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23

How much energy is released when $0.5\text{ kg}$ of $U^{235}$ undergoes fission reaction? (If the disintegration energy per event is $Q = 208\text{ MeV}$.)

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24

What is meant by **Alpha factor** and **Beta factor** for common emitter configuration of transistor? Derive relation between them.

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25

Briefly explain the principle of metal detector with circuit diagram.

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26

What is **electron volt (eV)**? Derive its relation with SI unit of energy.

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27

Under what condition a source (battery or cell) gives maximum power output? Discuss briefly.

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28

State **Lenz's law**. Prove that it is according to law of conservation of energy.

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