Class 11 Physics – Daily Revision MCQ (English Medium)
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Impulse is defined as J = F × t. Its dimensional formula is:
Chapter 1: Units and Measurements
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Answer: C. [M¹L¹T⁻¹]
Force has dimensions [M¹L¹T⁻²]; multiplying by time [T¹] gives [M¹L¹T⁻¹], the same as momentum (unit N s).If A = 2î + 3ĵ and B = 4î − ĵ, the scalar product A · B is:
Chapter 2: Mathematical Methods
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Answer: A. 5
A · B = AxBx + AyBy = (2)(4) + (3)(−1) = 8 − 3 = 5.A 2 kg trolley moving at 3 m/s hits a 1 kg trolley at rest and they stick together. Their common velocity just after the collision is:
Chapter 4: Laws of Motion
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Answer: B. 2 m/s
Momentum is conserved: 2 × 3 + 1 × 0 = (2 + 1)v, so v = 6/3 = 2 m/s (a perfectly inelastic collision).For a perfectly elastic head-on collision, the coefficient of restitution e is:
Chapter 4: Laws of Motion
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Answer: D. 1
e = (relative velocity of separation)/(relative velocity of approach); in an elastic collision these are equal, so e = 1 (e = 0 when the bodies stick together).The escape velocity from the surface of the Earth is about:
Chapter 5: Gravitation
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Answer: C. 11.2 km/s
Using v = √(2GM/R) with the Earth's G, M and R gives about 11.2 km/s; a body thrown up with this speed does not return.The SI unit of magnetic dipole moment is:
Chapter 12: Magnetism
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Answer: B. A m²
Magnetic dipole moment = pole strength (A m) × magnetic length (m), so its SI unit is A m².On a map, lines joining places that have the same magnetic declination are called:
Chapter 12: Magnetism
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Answer: B. isogonic lines
Places with equal declination are joined by isogonic lines; isodynamic lines join places with equal horizontal component BH.Radio waves that reach a distant receiver after reflection from the ionosphere (sky wave propagation) lie in the frequency range:
Chapter 13: Electromagnetic Waves and Communication System
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Answer: C. 3 MHz to 30 MHz
Sky waves are of frequency 3 MHz to 30 MHz; waves above about 30 MHz pass through the ionosphere instead of being reflected.Which electromagnetic waves carry the highest energy?
Chapter 13: Electromagnetic Waves and Communication System
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Answer: D. Gamma rays
Gamma rays, emitted from the nuclei of radioactive elements like uranium and radium, are the highest-energy EM waves (keV to GeV).A p-n junction diode is forward biased when:
Chapter 14: Semiconductors
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Answer: A. the p-region is joined to the positive terminal and the n-region to the negative terminal
In forward bias the external voltage lowers the potential barrier, so a large current flows across the junction.
Class 11: MCQ in other subjects
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All questions are written by PadhaiNotes in our own words from the chapters of the official Maharashtra State Board Balbharati textbook (ebalbharati.in). Each question shows its chapter.