HSC Science (Electronics) ११ वीं कक्षा - Maharashtra State Board Question Bank Solutions for Physics

Answer the following question in detail.

Obtain an expression for the critical velocity of an orbiting satellite. On what factors does it depend?

Describe how an artificial satellite using a two-stage rocket is launched in an orbit around the Earth.

Calculate the kinetic energy, potential energy, total energy and binding energy of an artificial satellite of mass 2000 kg orbiting at a height of 3600 km above the surface of the Earth.
Given: G = 6.67 × 10^-11 Nm²/kg²
R = 6400 km, M = 6 × 10²⁴ kg

Answer the following question in detail.

Two satellites A and B are revolving round a planet. Their periods of revolution are 1 hour and 8 hour respectively. The radius of orbit of satellite B is 4 × 10⁴ km. Find radius of orbit of satellite A.

Solve the following problem.

Calculate the speed of a satellite in an orbit at a height of 1000 km from the Earth’s surface.
(M_E = 5.98 × 10²⁴ kg, R = 6.4 × 10⁶ m)

Solve the following problem.

Calculate the value of acceleration due to gravity on the surface of Mars if the radius of Mars = 3.4 × 10³ km and its mass is 6.4 × 10²³ kg.

A planet has mass 6.4 × 10²⁴ kg and radius 3.4 × 10⁶ m. Calculate the energy required to remove an object of mass 800 kg from the surface of the planet to infinity.

Solve the following problem.

Calculate the value of the universal gravitational constant from the given data. Mass of the Earth = 6 × 10²⁴ kg, Radius of the Earth = 6400 km, and the acceleration due to gravity on the surface = 9.8 m/s².

A body weighs 5.6 kg wt on the surface of the Earth. How much will be its weight on a planet whose mass is 7 times the mass of the Earth and radius twice that of the Earth’s radius?

Solve the following problem.

What is the gravitational potential due to the Earth at a point which is at a height of 2R_E above the surface of the Earth?
(Mass of the Earth is 6 × 10²⁴ kg, radius of the Earth = 6400 km and G = 6.67 × 10^–11 N m² kg^–2)

Answer the following question.

What is the unit of dipole moment?

Answer briefly.

What is the modulation?

Answer briefly.

What is meant by amplitude modulation?

Answer briefly.

What is demodulation?

Answer briefly.

What type of modulation is required for television broadcast?

Answer briefly.

Why does amplitude modulation give noisy reception?

Answer briefly.

Explain why is modulation needed.

Answer the following question.

State the units of linear charge density.

Two charges 5 μC and -4μC are kept 5.0 m apart at points A and B respectively. How much work will have to be done to move the charge at A through a distance of 5.0 m further away from point B along the line BA?

Answer the following question.

While rotating an object or while opening a door or a water tap we apply a force or forces. Under which conditions is this process easy for us? Why? Define the vector quantity concerned. How does it differ for a single force and for two opposite forces with different lines of action?