Physics
Question from maharashtra board physics book of 12th maharashtra board
- Derive an expression that relates angular momentum with the angular velocity of a rigid body. Consider a rigid body rotating with a constant angular velocity w about an axis through the point O and perpendicular to the plane of the fi... 1
- State the conditions under which the theorems of parallel axes and perpendicular axes are applicable. The theorem of parallel axis is applicable to any body of arbitrary shape. The moment of inertia (MI) of the body about an axis through the... 1
- Using the energy conservation, derive the expressions for the minimum speeds at different locations along a Consider a particle of mass m attached to a string and revolved in vertical circle of radius r, At every instant of motion there are only tw... 2
- While driving along an unbanked circular road, a two-wheeler rider has to lean with the vertical. (i) When a bicyclist takes a turn along an unbanked road, the force of friction Fs provides the centripetal force; the normal reaction of th... 1
- Why is it useful to define radius of gyration? Radius of gyration is defined as the distance from the axis of rotation to a point where the total mass of the body is supposed to be concen... 2
- Explain with diagram the boiling point elevation in terms of vapour pressure lowering ? The boiling point of a liquid is the temperature at which the vapour pressure of the liquid becomes equal to the atmospheric pressure. For E... 2
- What is osmotic pressure ? Chemistry 12th osmosis is a flow of solvent through a semipermeable membrane into the solution. The direction of osmosis can be reversed by applying a pres... 2
- A gas contained in a cylinder fitted with a frictionless piston expands against a constant external pressure of 1 atm 106.5 J is the correct answer Solution:: 2
- If A and B are two skew-symmetric matrices of order n, then, (a) AB is a skew-symmetric matrix (c) is the correct option We are given A’ = -A and B’ = -B; Now, (AB)’ = B’;A’ = (-B) (-A) = BA = AB, if A and B commute. 1
- [MCQ ] Molecular solids are __________ crystalline solids amorphous solids a) crystalline solids , is the correct answer 2
- Niobium forms bcc structure the density of niobium is 8.55 g/cm3 and length of unit cell edge the correct answer is 1.62 × 10²^(1 ) EXplaination ^() 2
- Alluminium crystallizes in cubic close packed structure with unit cell edge 353.6 pm correct answer is r=125pm units=2.26×10²² Explanation https://youtu.be/RoQib35FfB4 1
- The density of iridium is 22.4 g/cm3 . The unit cell of iridium is fcc. Calculate the radius of iridium atom. Molar mass of iridium is 192.2 g/mol. The correct answer is 136 pm Explanation:: 1
- Draw the energy band diagram when intrinsic semiconductor (Ge) is doped with impurity atoms of Antimony (Sb). Answer :diagram: 2
- A gas contained in a cylinder fitted with a frictionless piston expands against a constant external pressure of 1 atm from triangle V =10-5=5 space litre=5×10³ m³ Q=400J space ,space space P=1atm =1.013×10⁻⁵ pa W=p.dV= 1.013×10⁵ ×5 ×10⁻³ =506.5 J triangle U=Q-W =... 1
- A resistor held in running water carries electric current. Treat the resistor as the system Answer: (a) No (b) Yes (c) Yes, electrical work is done on the resistor (d) Δ U = 0 , so the heat given to the water equals the electrical w... 1
- State and explain the first law of thermodynamics The first law of thermodynamics is a form of law of conservation of energy applied to a system. Mathematically it can be written as Q=triang... 1
- At what temperature will the rms speed of air molecules be double that NTP? The correct answer is 1092K or 819°C Explanation :: We have V_rms=√(3RTover M) --at T= T₀ (NTP) V_rms=√(3RT₀over M) But at temperature T V_r... 1
- If z1, z2 are complex numbers such that, 2z13z12z13z1is purely imaginary number, then finds |z1−z2z1+z2z1−z2z1+z2 | since , 2z₁/3z₁ is purely imaginary 2z₁/3z₁ == λ for some λ ∈ R z₁over z₂= 3 λ over2i Now , 2
- What are balance band and conduction band? Valence band The band having lower energy than conduction band is the valence band. The electrons in valence band are not free to move becau... 1
- What is the angular momentum of the electron in the third Bohr orbit in the hydrogen atom? Angular momentum of an electron in the nth Bohr orbit of hydrogen atom L= nh over 2π For n=3 L=3hover 2π L=3×1.055×10⁻³⁴ L=3.165 × 10⁻³⁴ Kg... 1
- The Boolean expression for an AND gate is ____. a) A+B b) A.B c) A+B d) A.B b) A.B is the correct answer 2
- A simple pendulum is suspended from the roof of a train. If the train is moving with an acceleration of 49 cm/s2 , pseudo force=ma gravity=mg tan θ = maover mg θ = tan⁻¹(maover mg) =tan⁻¹( 0.49over 9.8) =tan⁻¹(0.05) = 3 ^o 1
- all physics formulas {maharashtra board} read below pdf for all formulas from modern physics and shortcut files deleted edit01** 1