Board Boosters
The questions your board exam loves to ask
800 most-asked Class 11 & 12 (+1 / +2) questions across Physics, Chemistry, Maths and Biology — each with a model answer and the exact marking-scheme points examiners reward. Revise smart, walk in calm.
PhysicsClass 112 markseasy
System of Particles and Rotational Motion
Find the moment of inertia of a ring of mass 2 kg and radius 0.5 m about an axis passing through its centre and perpendicular to its plane.
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For a ring about its central axis, I = M R^2 = 2 * (0.5)^2 = 2 * 0.25 = 0.5 kg m^2.
I = M R^2
Marking-scheme points
- ✓Ring: I = M R^2
- ✓= 2 * 0.25
- ✓I = 0.5 kg m^2
PhysicsClass 112 marksmedium
Gravitation
What is a geostationary satellite? State any two conditions for a satellite to be geostationary.
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A geostationary satellite appears stationary relative to the Earth because it revolves in step with the Earth's rotation. Conditions: (i) its orbital period must equal 24 hours (equal to Earth's rotation period); (ii) it must orbit in the equatorial plane, in the same (west-to-east) sense as the Earth, at a height of about 36000 km.
Marking-scheme points
- ✓Period = 24 h (matches Earth)
- ✓Equatorial plane, west to east
- ✓Height ~ 36000 km
PhysicsClass 112 markseasy
Mechanical Properties of Solids
State Hooke's law and define the elastic limit.
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Hooke's law: within the elastic limit, the stress developed in a body is directly proportional to the strain produced, i.e. stress / strain = a constant (the modulus of elasticity). The elastic limit is the maximum stress up to which a body returns to its original shape and size on removing the deforming force; beyond it, permanent (plastic) deformation occurs.
stress = E * strain
Marking-scheme points
- ✓Stress proportional to strain (within elastic limit)
- ✓stress/strain = modulus of elasticity
- ✓Elastic limit: max stress for full recovery
PhysicsClass 112 markseasy
Mechanical Properties of Fluids
State Pascal's law and give one application of it.
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Mechanical Properties of Fluids
State the equation of continuity for fluid flow and what it represents.
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Mechanical Properties of Fluids
Define surface tension. Give one everyday example that demonstrates it.
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Thermal Properties of Matter
Define the coefficient of linear expansion. Write the relation for the increase in length of a rod on heating.
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Thermal Properties of Matter
Distinguish between specific heat capacity and latent heat.
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Thermal Properties of Matter
State Newton's law of cooling.
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Thermodynamics
State the zeroth law of thermodynamics. What does it define?
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Thermodynamics
State the second law of thermodynamics (any one statement).
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Kinetic Theory
State the law of equipartition of energy and give the degrees of freedom of a monatomic and a diatomic gas molecule.
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Oscillations
Define simple harmonic motion (SHM) and write its defining equation.
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Oscillations
Write the expression for the time period of a mass m attached to a spring of force constant k, and state how it changes if the mass is quadrupled.
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Oscillations
What are forced oscillations and resonance?
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Waves
Derive the relation between wave speed, frequency and wavelength.
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Waves
Distinguish between progressive (travelling) and stationary (standing) waves.
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Motion in a Straight Line
Define relative velocity. Two trains move in the same direction at 60 km/h and 40 km/h - what is the velocity of the first relative to the second?
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Gravitation
Write the expression for the gravitational potential energy of a mass m at a distance r from the centre of the Earth (mass M), and explain why it is negative.
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Work, Energy and Power
Define the coefficient of restitution. What are its values for a perfectly elastic and a perfectly inelastic collision?
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