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Grade 11 Physics Solved Model Paper 2027 – ALP Smart Syllabus Punjab Board
11 Grade Physics ALP Solved Model Paper 2027
Prepare effectively for the Grade 11 Physics Annual Examination 2027 with the ALP Smart Syllabus Physics Solved Model Paper 2027, prepared according to the latest syllabus issued by PECTAA Punjab. This Class 11 Physics Test Series includes Class Test 1, Full Book Test, and Chapter Wise Test Series, along with solved questions to support students in their board examination preparation. These Punjab Board 2027 Model Papers are designed to help students understand important concepts, practise exam-oriented questions, and improve their preparation according to the new Punjab Board syllabus. Students can use these Grade 11 Physics Solved Model Papers to revise important topics and prepare confidently for the Annual Examination 2027.
MODEL PAPER OF PHYSICS FOR GRADE-11
(For Annual Exam-2027) — OBJECTIVE TYPE
Max. Marks: 17Time: 20 mins
Q.1 Four possible answers A, B, C & D are given. Fill the correct circle with marker or pen. Cutting or filling two or more circles gives zero mark. (1×17=17)
1. The ratio of the dimensions of force and energy is:
(A) T(B) T-1(C) L(D) L-1
Ans: (D) — F = MLT−2, E = ML²T−2; F/E = L−1.
2. The projectile gains its maximum height at an angle of:
(A) 0°(B) 45°(C) 60°(D) 90°
Ans: (D) — H = v²sin²θ/2g is maximum at θ = 90° (range is maximum at 45°).
3. An object in uniform circular motion makes 10 revolutions in 2 s. Which is true?
(A) Its period is 2.0 s(B) Its period is 20 s(C) Its frequency is 5 Hz(D) Its frequency is 0.2 Hz
Ans: (C) — f = 10/2 = 5 Hz, T = 0.2 s.
4. If an athlete uses 500 J of energy to lift a load in 2 s, his muscular power is:
(A) 125 watt(B) 250 watt(C) 500 watt(D) 1000 watt
Ans: (B) — P = W/t = 500/2 = 250 W.
5. A solid floats in water with half of its volume submerged. Its density is:
(A) equal to density of water(B) half the density of water(C) twice the density of water(D) zero
Ans: (B) — Floating: ρsV = ρw(V/2) ⇒ ρs = ρw/2.
6. The pressure will be low when speed of a fluid is:
(A) zero(B) high(C) low(D) constant
Ans: (B) — Bernoulli: high speed ⇒ low pressure.
7. First law of thermodynamics is based upon law of conservation of:
(A) mass(B) energy(C) momentum(D) charge
Ans: (B) — ΔU = Q − W.
8. The bending of waves around an obstacle is called:
(A) refraction(B) reflection(C) diffraction(D) interference
Ans: (C) — Definition of diffraction.
9. If the amplitude of a wave is tripled, energy is increased by:
(A) 3 times(B) 6 times(C) 9 times(D) 12 times
Ans: (C) — E ∝ A² ⇒ 3² = 9.
10. Mathematical representation of Malus’s law is:
(A) I = I0cos²θ(B) I = I0sin²θ(C) I = I0tan²θ(D) I = I0cot²θ
Ans: (A) — Malus’s law.
11. Work done on an electron by a potential difference of 100 volts is:
(A) 1.6×10-19 eV(B) 1.6×10-17 eV(C) 6.25×10-17 eV(D) 100 eV
Ans: (D) — W = qV = e(100 V) = 100 eV.
12. A wire of resistance R is cut into two equal parts, each R/2. What happens to resistivity?
(A) It becomes double(B) It remains the same(C) It becomes half(D) It becomes one fourth
Ans: (B) — Resistivity is a property of the material.
13. The unit NA-1m-1 is called:
(A) weber(B) tesla(C) coulomb(D) none of these
Ans: (B) — B = F/(IL) ⇒ tesla.
14. According to Faraday’s law, what causes an emf in a coil?
(A) A constant magnetic field(B) A changing magnetic flux linkage(C) Heat applied to the coil(D) Increasing the wire thickness
Ans: (B) — emf = −d(NΦ)/dt.
15. If the rest mass m0 of a particle increases to m at high speed, its kinetic energy is:
(A) ½mc²(B) ½mv²(C) (m − m0)c²(D) ½(m − m0)c²
Ans: (C) — K.E. = mc² − m0c².
16. Baryon is formed by combination of:
(A) 2 quarks(B) 3 quarks(C) 4 quarks(D) a quark and an anti-quark
Ans: (B) — Baryons = 3 quarks (mesons = quark + antiquark).
17. Which force has negligible effect between elementary particles?
(A) Strong nuclear force(B) Weak nuclear force(C) Gravitational force(D) Electromagnetic force
Ans: (C) — Gravity is extremely weak at particle scale.
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SUBJECTIVE TYPE (Part-1)
Max. Marks: 68Time: 2:40 hours
Q.2 Any Eight (08) short questions2 × 8 = 16
(i) How many significant figures: (a) 37 km (b) 0.002953 m (c) 7.50034 cm (d) 200.0 m?
(a) 2 (b) 4 (c) 6 (d) 4
(ii) What is a dimensionless quantity? Give one example.
A quantity having no dimensions, e.g. angle (radian), strain, refractive index.
(iii) Differentiate between elastic and inelastic collision.
Elastic: both momentum and K.E. conserved. Inelastic: only momentum conserved; part of K.E. is lost (heat, sound, deformation).
(iv) Show that rate of change of momentum equals force. State Newton’s 2nd law in terms of momentum.
F = ma = m(vf − vi)/t = (pf − pi)/t = Δp/Δt. Law: the rate of change of momentum of a body equals the net force applied, in the direction of the force.
(v) Mass measures inertia in linear motion. What is the analogue in rotational motion?
Moment of inertia I = Σmr²; it measures a body’s resistance to change in its rotational motion.
(vi) Prove 1 rad = 57.3°.
2π rad = 360° ⇒ 1 rad = 360°/2π = 180°/3.1416 = 57.3°.
(vii) How does an astronaut feel weightless in orbit?
The spaceship and astronaut are in free fall with the same acceleration, so there is no reaction force between them; apparent weight is zero.
(viii) A car turns left; in which direction do occupants tend to fall?
Towards the right (outward), because of inertia — the body tends to continue in a straight line.
(ix) What is a conservative force? Give examples.
A force whose work is independent of path (zero over a closed path), e.g. gravitational, electrostatic and elastic spring force.
(x) Power of a crane lifting 1000 kg through 100 m in 20 s.
P = mgh/t = (1000)(9.8)(100)/20 = 49000 W = 49 kW.
(xi) Why is work done against friction non-conservative?
It depends on the path length and energy is dissipated as heat, so it cannot be fully recovered.
(xii) Differentiate between P.E and absolute P.E.
P.E. = mgh is measured relative to a chosen reference level; absolute P.E. = −GMm/r is measured relative to infinity (zero at infinity).
Q.3 Any Eight (08) short questions2 × 8 = 16
(i) Working of carburetor using Bernoulli’s principle.
Air flows through a narrow venturi section at high speed, so pressure falls. The higher atmospheric pressure in the float chamber pushes petrol through the jet into the air stream, forming the fuel–air mixture.
(ii) Differentiate laminar and turbulent flow.
Laminar: smooth, parallel streamlines at low speed. Turbulent: irregular, eddies and mixing at high speed.
(iii) Why must speed of an object be minimum against drag force?
Drag increases with speed (∝ v or v²), so lower speed means less drag and less energy/fuel used.
(iv) Why are aeroplane wings rounded outward and flat inward?
Air above the curved surface moves faster ⇒ lower pressure; below it is slower ⇒ higher pressure. The pressure difference gives upward lift (Bernoulli).
(v) Why is adiabat steeper than isotherm?
Isotherm: PV = const, slope −P/V. Adiabat: PVγ = const, slope −γP/V; γ > 1, so it is steeper.
(vi) How does thermodynamics relate to energy conservation?
The first law ΔU = Q − W states that energy is neither created nor destroyed; heat supplied becomes internal energy and work.
(vii) Relationship between intensity, area and amplitude.
I = P/A (power per unit area) and I ∝ (amplitude)². For spherical waves I ∝ 1/r² since area ∝ r².
(viii) How should a sound source move so that frequency does not change?
Perpendicular to the line joining source and observer (no relative radial velocity), or source and observer move together with the same velocity.
(ix) Conditions for two-source interference fringes.
Sources must be coherent (constant phase difference), of same frequency and nearly equal amplitude, and close together compared with the screen distance.
(x) Can Doppler effect be applied to light waves?
Yes. Light shows red shift (source receding) and blue shift (approaching); it depends on relative velocity as no medium is needed.
(xi) Compare Brewster’s law and Malus’s law.
Brewster: tanθp = n gives angle of complete polarization by reflection. Malus: I = I0cos²θ gives intensity of polarized light through an analyser.
(xii) How do masses, orbital period and eccentricity affect gravitational waves?
Larger masses give larger amplitude; shorter orbital period gives higher frequency; eccentricity adds extra harmonics and changes the waveform shape.
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Q.4 Any Six (06) short questions2 × 6 = 12
(i) Is electron-volt a unit of potential difference or energy?
Energy: 1 eV = 1.6×10-19 J, the energy gained by an electron through 1 V.
(ii) What is conventional current?
Current taken as flow of positive charge from the positive to the negative terminal (opposite to electron flow).
(iii) Why does terminal p.d. of a battery fall when current increases?
V = E − Ir; larger I gives a larger drop across internal resistance r.
(iv) Does induced emf always act to decrease the magnetic flux?
No. It opposes the change in flux: it reduces flux when flux increases and supports it when flux decreases (Lenz’s law).
(v) Distinguish magnetic flux and flux density.
Flux Φ = BA cosθ (weber) is the total field through an area; flux density B = Φ/A (tesla) is flux per unit perpendicular area.
(vi) How does an electric heater work on electromagnetic induction?
It does not; it works on the heating effect of current (Joule heating, H = I²Rt).
(vii) Why can’t a material particle move with speed of light?
Its relativistic mass m = m0/√(1 − v²/c²) becomes infinite at v = c, needing infinite energy.
(viii) Difference between beta particle and electron?
They are identical particles, but a beta particle is emitted from the nucleus (n → p + β− + ν̄), while an electron orbits the nucleus.
(ix) Why must a neutrino be released in positron emission?
To conserve energy, linear momentum, angular momentum (spin) and lepton number: p → n + β+ + ν.
Part – 2
Note: Attempt any Three (03) questions3 × 8 = 24
5 (a) Give the dimensions of velocity. Explain elastic collision in one dimension and derive the final velocities. (5)
Dimensions of velocity: [LT−1]. Elastic collision in 1-D: bodies m1, m2 with u1, u2. Momentum: m1u1 + m2u2 = m1v1 + m2v2 …(1). K.E.: ½m1u1² + ½m2u2² = ½m1v1² + ½m2v2² …(2). Dividing (2) by (1) gives u1 + v1 = u2 + v2. Solving: v1 = [(m1−m2)/(m1+m2)]u1 + [2m2/(m1+m2)]u2; v2 = [2m1/(m1+m2)]u1 + [(m2−m1)/(m1+m2)]u2.
(b) A car is moving with a speed of 108 km h-1. If its wheel has a diameter of 60 cm, find its angular speed in rad s-1 and rev s-1. (3)
v = 108 km/h = 30 m/s; r = 0.30 m. ω = v/r = 30/0.3 = 100 rad/s; frequency = ω/2π = 100/6.283 = 15.9 rev/s.
6 (a) State and explain the work–energy theorem. How is mechanical work expressed in terms of pressure and volume for a gas? Derive the equation. (5)
Work–energy theorem: net work done = change in K.E., W = ½mvf² − ½mvi². For a gas at constant pressure P in a cylinder of area A, force F = PA; piston moves d: W = Fd = PAd = PΔV.
(b) A spring with spring constant 200 N m-1 is stretched by 0.5 m. Find the elastic P.E. stored in the spring. (3)
P.E. = ½kx² = ½(200)(0.5)² = 25 J.
7 (a) What are gravitational waves? How can they be predicted and detected? Also give their four basic types. (5)
Gravitational waves are ripples in space-time produced by accelerating massive objects (e.g. merging black holes). Predicted: by Einstein’s general relativity (1916). Detected: by laser interferometers (LIGO) measuring tiny changes in arm length (first detection 2015). Four types: continuous, compact binary inspiral, stochastic, burst.
(b) Two trucks P and Q travel along a motorway in the same direction. The leading truck P travels at a steady 12 m s-1; truck Q, travelling at a steady 20 m s-1, sounds its horn, which P’s driver estimates has a frequency of 830 Hz. What frequency does Q’s own driver hear? (Speed of sound = 340 m s-1) (3)
Q is behind P and approaches it, P moves away at 12 m/s. f’ = f(v − vP)/(v − vQ) ⇒ 830 = f(340−12)/(340−20) = f(328/320). f = 830 × 320/328 = ≈ 810 Hz (Q’s own driver hears the true frequency).
8 (a) What are ferrofluids? Give their working, uses and applications in detail. (5)
Ferrofluids are colloidal liquids of nano-sized magnetite particles coated with surfactant in a carrier liquid; they become strongly magnetized in a field while remaining liquid. Uses: loudspeaker coolant and damping, rotary seals, targeted drug delivery, MRI contrast, heat transfer, sink-float separation.
(b) A particle of charge +20 μC is placed between two parallel plates, 10 cm apart, with a potential difference of 0.5 kV. Calculate the electric field between the plates and the electric force on the particle. (3)
E = V/d = 500/0.10 = 5000 V/m; F = qE = (20×10−6)(5000) = 0.1 N.
9 (a) What is meant by radioactivity? Compare the properties and behaviour of three types of radiations. (5)
Radioactivity: spontaneous emission of radiation from unstable nuclei. α: He nucleus, charge +2e, highly ionizing, stopped by paper. β: electron/positron, ±e, medium ionization, stopped by few mm aluminium. γ: EM radiation, no charge, weak ionization, very penetrating (needs thick lead).
(b) A bar 1.0 m long along the x-axis moves with a speed of 0.75 c relative to a stationary observer. What is the length of the bar as measured by the observer? (3)
L = L0√(1 − v²/c²) = 1.0 × √(1 − 0.5625) = √0.4375 = 0.66 m.
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