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
Units and Measurements
Check whether the equation v = u + at is dimensionally consistent.
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[v] = L T^-1, [u] = L T^-1, and [at] = (L T^-2)(T) = L T^-1. Every term has the same dimension L T^-1, so the equation is dimensionally consistent (homogeneous).
[a] = L T^-2, [t] = T
Marking-scheme points
- ✓Write dimensions of each term
- ✓All three terms reduce to L T^-1
- ✓Same dimension on both sides => consistent
The concept
Every physically correct equation must have the same dimensions on both sides - a quick sanity check.
Why it matters
Physicists and engineers use it to catch mistakes and even guess formulas before solving anything.
💡 Memory trick
If the units don't match, the equation is scratch. Check L, M, T on both sides.
PhysicsClass 112 markseasy
Laws of Motion
Define impulse of a force and state its relation with momentum.
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Impulse is the product of a force and the time for which it acts: J = F * (delta t). By the impulse-momentum theorem it equals the change in momentum: J = delta p = m v - m u. SI unit: N s (= kg m/s).
J = F * delta t = delta p
Marking-scheme points
- ✓J = F * delta t
- ✓Impulse-momentum theorem: J = delta p
- ✓Unit N s
PhysicsClass 112 markseasy
Work, Energy and Power
State and explain the work-energy theorem.
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The work-energy theorem states that the work done by the net force on a body equals the change in its kinetic energy: W_net = (1/2) m v^2 - (1/2) m u^2. If net work is positive the body speeds up; if negative, it slows down.
W_net = (1/2)m v^2 - (1/2)m u^2
Marking-scheme points
- ✓W_net = change in KE
- ✓W = (1/2)mv^2 - (1/2)mu^2
- ✓Positive work => speeds up
PhysicsClass 112 markseasy
System of Particles and Rotational Motion
Define moment of inertia. State its SI unit and mention two factors on which it depends.
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Gravitation
Explain why the acceleration due to gravity decreases as we go to a height above the Earth's surface.
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Mechanical Properties of Solids
Define Young's modulus of elasticity and give its SI unit.
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Mechanical Properties of Fluids
State Bernoulli's principle and write its mathematical form.
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Thermodynamics
State the first law of thermodynamics and give the sign convention used.
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Waves
Distinguish between transverse and longitudinal waves, giving one example of each.
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Laws of Motion
State Newton's second law of motion and show that it leads to F = m a.
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Units and Measurements
Distinguish between systematic errors and random errors.
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Motion in a Straight Line
Distinguish between distance and displacement.
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Motion in a Plane
What is centripetal acceleration? Write its expression and state its direction.
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Laws of Motion
State Newton's third law of motion and give one example.
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Laws of Motion
Distinguish between static friction and kinetic friction.
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Work, Energy and Power
Define work done by a constant force. When is the work done (a) zero and (b) negative?
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Work, Energy and Power
Distinguish between conservative and non-conservative forces with one example each.
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Work, Energy and Power
Distinguish between elastic and inelastic collisions.
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System of Particles and Rotational Motion
Define torque (moment of a force). Write its expression and SI unit.
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System of Particles and Rotational Motion
What is the radius of gyration of a body? How is it related to the moment of inertia?
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One question at a time is how every topper started. Bookmark this, revise a few each day, and watch the fear shrink. And if a friend is stressing about boards — send this their way. You both win.