HSC Science (General) इयत्ता ११ वी - Maharashtra State Board Question Bank Solutions

Answer briefly.

Why are microwaves used in radar?

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Can we produce a pure electric or magnetic wave in space? Why?

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Does an ordinary electric lamp emit EM waves?

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Why light waves travel in a vacuum whereas sound waves cannot?

What are the ultraviolet rays?

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What are radio waves?

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Give two uses of ultraviolet rays.

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Give two uses of radio waves.

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Name the most harmful radiation entering the Earth's atmosphere from outer space.

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What is a carrier wave?

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Why high-frequency carrier waves are used for the transmission of audio signals?

Solve the numerical problem.

Calculate the frequency in MHz of a radio wave of wavelength 250 m. Remember that the speed of all EM waves in a vacuum is 3.0 × 10⁸ m/s.

Solve the numerical problem.

Calculate the wavelength in nm of an X-ray wave of frequency 2.0 × 10¹⁸ Hz.

Solve the numerical problem.

The speed of light is 3 × 10⁸ m/s. Calculate the frequency of red light of a wavelength of 6.5 × 10⁻⁷ m.

Calculate the wavelength of a microwave of a frequency of 8.0 GHz.

Write the answer of the question with reference to laws of gravitation.

State the universal law of gravitation.

Answer the following question.

What are the dimensions of the universal gravitational constant?

Answer the following question.

State Newton’s law of gravitation and express it in vector form.

What do you mean by a gravitational constant?

Solve the following problem.

Find the gravitational force between the Sun and the Earth.
Given Mass of the Sun = 1.99 × 10³⁰ kg
Mass of the Earth = 5.98 × 10²⁴ kg
The average distance between the Earth and the Sun = 1.5 × 10¹¹ m.