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# TNPSC - Important Questions and Answer of Science Subjects

Questions
1. The Screw gauge works on the principle of _____
2. The Scale present on index line of screw gauge is called as ____
3. Screw guage consists of _____ scale and ____ scale.
4. Pitch of the screw P = _____ / No.of revolutions made.
5. L.C. of a Screw guage = pitch of the screw / ____
6. If the Zeroth division of the head scale in below the indexline of the pitch scale, the error is said to be _____ and the correction is _____
7. If 'p' is the pitch of the scale and 'N' is no.of head scale divisions them L.C.= _____
8. If screw moves 5mm for 5 revolutions, the pitch of the screw is _____
9. If a screw consists 200 head scale divisions which contains pitch as 1mm then the least count is _____
10. If the L.C. is 0.01 mm, Pitch scale reading is 1.5 mm and the headscale reading is 18, then the diametre of the object is ____

1. Screw 2. Pitch Scale
4. Distance travelled by the Screw
6. Positive, negative
7. P/N 8. 1 mm
9. 0.005mm
10. 1.68 mm

Questions:
1. The value of the universal gravitational constant is ____
2. The weight of 400g stone is _____ N
3. Units for 'G' in SI System ____
4. Ptolemaic theory is also known as ____
5. As per Kepler's theory, the planet revolves around sun in_____ path.
6. Universal law of gravitation is applicable at _____
7. Kepler's law supports _____ theory
8. Heliocentric theory is proposed by _____
9. Units of acceleration due to gravity is _____
10. Acceleration due to gravity at poles is______  and at equator it is _____

1. 6.67×10–11Nm2Kg–2 2. 3.9 N
3. Nm2Kg–2
4. Geocentric theory
5. Elliptical
6. Anywhere in the universe
7. Heliocentric theory
8. Copornicus
9. mg–2
10. Maximum, Minimum