PAPER – PHYSIC
Q.1:- The parallax of a Heavenly body measured from two points diametrically opposite on equator of earth is 1.0 minute . If the radius of earth is 6400 km, from the distance of the heavenly body from the centre of earth in AU, taking 1 AU = m
Q.2:- The angle subtended by moon at a point on earth is 0 . If the distance of moon from earth is 3.34 m, find the the diameter of moon.
Q.3:- Ten drops of olive oil of radius 0.20 mm spread into a circular film of radius 14.6 cm. on the surface of water. Estimate the size of an oil molecule.
Q.4:- Two atomic clocks allowed to run for average life of an Indian (say, 70 years) differ by 0.2 s only. Calculate the accuracy of standard atomic clock in measuring a time interval of 1 sec.
Q.5:- Suggest a distance corresponding to each of the following order of length :
(a) m (b) m (c) m (d) m (e) m (f) m (g) m
Q.6:- The screw of a spherometer moves by 4 mm. When its circular scale is given four complete rotations. If circular scale has 200 divisions, calculate pitch and least count of the spherometer.
Q.7:- When circular scale of a screw gaug carrying 100 divisions is given four complete rotations, the head of the screw moves through 2 mm. Calculate pitch and least count of the screw gauge.
Q.8:- Mention repetitive phenomena in nature which could serve as time standards. Which one is most suitable ?
Q.9:- What is the basic principal of alpha particle scattering method for estimating the size of the nucleus ?