Physics 11 past paper 2025

The dimensions [ML²T⁻²] show:

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Briefly explain **'precision'** and **'accuracy'** with a diagram.

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State and explain **vector product** with an example. Also show that $\bar{A} \times \bar{B} \neq \bar{B} \times \bar{A}$.

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If $r = 2.25 \pm 0.01 \text{ cm}$ then percentage uncertainty in "$r$" will be:

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How can ordinary light be polarized using polarizers?

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What is meant by **projectile**? Derive the mathematical expressions of the following for projectile motion: i) Time of flight ii) Range and maximum range of projectile

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$\hat{j} \cdot (\hat{i} \times \hat{k}) =$

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The velocity of a missile traveling at $1500 \text{ ms}^{-1}$ increases to $5000 \text{ ms}^{-1}$ after moving through a distance of $70 \text{ km}$. Calculate the time for the mis…

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Explain the working of a refrigerator. Also explain the coefficient of performance of a refrigerator.

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Magnitude of centripetal force $F_c =$

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A body at $200^{\circ}\text{C}$ undergoes a reversible isothermal process. The heat energy removed in this process is $7300 \text{ J}$. Calculate the entropy change and discuss ent…

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State **work-energy theorem**. Explain this theorem for resistive medium.

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If the voltage and current remain constant in a DC motor, then its rotational speed:

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What is meant by **'conservative'** and **'non-conservative'** forces? Give one example each.

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State the **equation of continuity** and derive its mathematical form. On what basis is the equation of continuity derived?

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Two bodies A and B of same masses have velocities in the ratio $2:1$, their kinetic energies are in the ratio:

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What is meant by **Magnus effect**? Explain with the help of an example.

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What is meant by **elastic potential energy**? Find a relation for the elastic potential energy of a material.

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What is the weight of a $100 \text{ g}$ mass?

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Differentiate between **crystalline solids** and **amorphous solids**. (Give at least three differences.)

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Why does an astronaut feel weightless in space? How can artificial gravity be produced in a satellite? For a satellite derive expression for angular velocity, time period and frequ…

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Young's Modulus, $Y =$

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Earth completes its one rotation about its axis in $24 \text{ hours}$. Calculate angular velocity of earth about its axis in radian per second.

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In an adiabatic process which quantity remains constant?

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The Doppler effect is used in radar systems. Briefly explain the working of a radar system.

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Location of a submarine in deep sea can be detected by:

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Verify that: $(\vec{A} \cdot \vec{B})^2 + (\vec{A} \times \vec{B})^2 = (AB)^2$

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An electron is placed in a uniform electric field directed from south to north. In which direction will the electron move after it is released?

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Calculate KE in electron volt and joules gained by an electron moving through a potential difference of $2 \text{ volts}$.

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To increase the sensitivity of a galvanometer, the suspension wire should be:

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What happens to the density of an object as it moves in a direction with very high speed relative to the speed of light? Justify.

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Two parallel wires carrying current in opposite directions, the wires will:

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Why does the resistance of LDR decrease with increase in intensity of light on it?

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One weber is equal to:

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State **Faraday's law** of electromagnetic induction. Give its mathematical form.

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When an object moves with a very high speed, its length __________ in the direction of its motion.

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Does the induced emf in a circuit depend on the resistance of the circuit? Does the induced current depend on the resistance of the circuit? Justify.

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At what speed would the mass of proton be doubled? The rest mass of proton is $1.673 \times 10^{-27} \text{ kg}$.

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The Kinetic energy of a charged particle moving in a uniform magnetic field does not change. Why? Explain briefly.

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If $^{233}_{92}U$ decays twice by alpha particle emission, what is the resulting isotope? Show by equation.

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What is **Faraday's cage**? Briefly explain its working.

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Compare gluons and photons.

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What is meant by **annihilation**? Give one annihilation reaction.

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To increase the intensity of wave by a factor of 10, calculate the required increase in amplitude of wave.

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How will the radius of a flexible ring change if it is given negative charge?

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What is the difference between **inertial** and **non-inertial** frame of reference?

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Use dimensional analysis to prove the equation $P = \rho gh$ is dimensionally homogeneous.

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Write three statements of **second law of thermodynamics**. (one in terms of entropy)

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Derive the relation between torque, moment of inertia and angular acceleration.

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What is meant by **interference**? Give conditions for interference.

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