Solve the SCRA Exam Question Paper of the previous year. Prepare better.
2. A model of soalr system is scaled down in the ratio 'k' but of materials of same mean density and actual materials of the planets and the sun. What happens to orbital periods of revolution of the planetary models ?
(a) Theorbital period of revolution does not change
(b) The orbital period of revolution increases by a factor 'k'
(c) The orbital period of revolution increses by a factor 'k'
(d) Data insufficient to draw the conclusion
4. The ultimate limit of resolution of an optical microscope is set by :
(b) length of microscope tube
(c) design of objective lens
(d) diffraction of light
5. 8 g of oxygen and 7 g of nitrogen are mixed in a container. Waht is the value of 'n' in the expression PV=nRT of this mixture ?
6. The car piece of a telephone is made of material having:
(a) large hyteresis and high permeability
(b) low hysteresis and large retentivity
(c) high permeability and low eddy current only
(d) low hysterest, low eddy current and high permeability
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