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
Mechanical Properties of Solids
Name the three moduli of elasticity and state what each measures.
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Young's modulus (Y) measures resistance to change in length (longitudinal stress/strain). Bulk modulus (B) measures resistance to change in volume (volume stress/strain) under uniform pressure. Shear (rigidity) modulus (G) measures resistance to change in shape (shearing stress/strain).
Marking-scheme points
- ✓Young's Y: change in length
- ✓Bulk B: change in volume
- ✓Shear/rigidity G: change in shape
PhysicsClass 112 marksmedium
Thermal Properties of Matter
State Stefan's law and Wien's displacement law of black-body radiation.
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Stefan's (Stefan-Boltzmann) law: the total energy radiated per unit area per unit time by a black body is proportional to the fourth power of its absolute temperature, E = sigma T^4. Wien's displacement law: the wavelength at which the emission is maximum is inversely proportional to the absolute temperature, lambda_max * T = constant (= 2.9 x 10^-3 m K).
E = sigma T^4 ; lambda_max T = b
Marking-scheme points
- ✓Stefan: E = sigma T^4
- ✓Wien: lambda_max T = constant
- ✓Hotter body -> shorter peak wavelength
PhysicsClass 112 marksmedium
Kinetic Theory
Define mean free path of a gas molecule. State two factors it depends on.
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The mean free path is the average distance a gas molecule travels between two successive collisions. It increases when the number density of molecules is low and when the molecular diameter is small; that is, it is inversely proportional to the number density and to the square of the molecular diameter.
lambda = 1 / (sqrt(2) pi d^2 n)
Marking-scheme points
- ✓Average distance between collisions
- ✓Inversely proportional to number density
- ✓Inversely proportional to (diameter)^2
PhysicsClass 112 markseasy
System of Particles and Rotational Motion
Define the centre of mass of a system of particles. Write its position for a two-particle system.
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Gravitation
How does the acceleration due to gravity vary with depth below the Earth's surface? What is its value at the centre?
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Motion in a Plane
What is meant by resolution of a vector? Write the rectangular components of a vector A making angle theta with the x-axis.
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Thermodynamics
What is a quasi-static process? Why is it important?
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Gravitation
State Newton's universal law of gravitation and write its mathematical form.
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Electric Charges and Fields
State Coulomb's law of electrostatics and write its mathematical form.
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Electric Charges and Fields
Define electric field intensity at a point. State its SI unit.
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Electric Charges and Fields
Derive the expression for the torque acting on an electric dipole placed in a uniform electric field.
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Electrostatic Potential and Capacitance
Define electric potential at a point. State its SI unit and write the expression for the potential due to a point charge.
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Electrostatic Potential and Capacitance
Write the relation between electric field and electric potential. What does the negative sign indicate?
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Electrostatic Potential and Capacitance
Define capacitance of a conductor. State its SI unit.
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Electrostatic Potential and Capacitance
Write the expression for the energy stored in a charged capacitor in three equivalent forms.
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Electrostatic Potential and Capacitance
How does the introduction of a dielectric slab between the plates of a capacitor affect its capacitance? Explain.
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Current Electricity
State Ohm's law. Define resistance and give its SI unit.
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Current Electricity
Define resistivity of a material. How does the resistance of a wire depend on its length and area of cross-section?
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Current Electricity
State Kirchhoff's two laws for electrical circuits.
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Current Electricity
Write the effective emf and internal resistance when n identical cells are connected in series.
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