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A radar signal is beamed towards a planet from the earth and its echo is received seven minutes later. Calculate the velocity of the signal, if the distance between the planet and the earth is

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Give two methods for measuring time

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Find the dimensions of latent heat and specific

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in Vander Waal’s equation

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E, m, l and G denote energy, mass, angular momentum and gravitational constant respectively. Determine the dimensions of

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The earth-moon distance is about 60 earth radius. What will be the diameter of the earth (approximately in degrees) as seen from the

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Moon is seen to be of `(1⁄2)^°` diameter from the earth. What must be the relative size compared to the

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From parallax measurement, the sun is found to be at a distance of about 400 times the earth-moon distance. Estimate the ratio of sun-earth

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Which of the following time measuring devices is most precise? A wall

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Which of the following time measuring devices is most precise? A stop

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Which of the following time measuring devices is most precise? A digital

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Which of the following time measuring devices is most precise? An atomic clock. Give reason for your

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The distance of a galaxy is of the order of 1025 m. Calculate the order of magnitude of time taken by light to reach us from the

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The vernier scale of a travelling microscope has 50 divisions which coincide with 49 main scale divisions. If each main scale division is 0.5 mm, calculate the minimum inaccuracy in the measurement of

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During a total solar eclipse the moon almost entirely covers the sphere of the sun. Write the relation between the distances and sizes of the sun and

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If the unit of force is 100 N, unit of length is 10 m and unit of time is 100 s, what is the unit of mass in this system of

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Give an example of a physical quantity which has a unit but no

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Give an example of a physical quantity which has neither unit nor

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Give an example of a constant which has a

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Give an example of a constant which has no

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