33 Years NEET-AIPMT Chapterwise Solutions - Physics 2020

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Electric Charges and FieldsTelegram @unacademyplusdiscounts1CHAPTER1Physical World **This chapter is an introductory one. It covers some basic informationabout definition of Physics, scope of Physics, Physics and technology,four fundamental forces and nature of Physical laws. No questionshave been asked from this chapter in the NEET/ AIPMT till date.
Telegram @unacademyplusdiscounts2 NEET-AIPMT Chapterwise Topicwise Solutions PhysicsCHAPTER2Units andMeasurements2.2 The International System of Units1. The unit of thermal conductivity is(a) W m –1 K –1 (b) J m K –1(c) J m –1 K –1 (d) W m K –1 (NEET 2019)2. The damping force on an oscillator is directlyproportional to the velocity. The units of the constantof proportionality are(a) kg m s –1 (b) kg m s –2(c) kg s –1 (d) kg s (2012)3. The unit of permittivity of free space, e 0 , is(a) coulomb/newton-metre(b) newton-metre 2 /coulomb 2(c) coulomb 2 /newton-metre 2(d) coulomb 2 /(newton-metre) 2 (2004)2.6 Accuracy, Precision of Instruments andErrors in Measurement4. A screw gauge has least count of 0.01 mm and thereare 50 divisions in its circular scale. The pitch of thescrew gauge is(a) 0.01 mm (b) 0.25 mm(c) 0.5 mm (d) 1.0 mm (NEET 2020)5. In an experiment, the percentage of error occurredin the measurement of physical quantities A, B, Cand D are 1%, 2%, 3% and 4% respectively. Then themaximum percentage of error in the measurementX, where X AB 2 1/2= , will be13 / 3C D(a) 10% (b) (3/13)%(c) 16% (d) –10% (NEET 2019)6. The main scale of a vernier callipers hasn divisions/cm. n divisions of the vernier scalecoincide with (n – 1) divisions of main scale. Theleast count of the vernier callipers is1(a)cm (b) 1( n+ 1)( n−1)n cm1(c)2n cm 1(d) cmnn ( + 1)(Odisha NEET 2019)7. A student measured the diameter of a small steelball using a screw gauge of least count 0.001 cm.The main scale reading is 5 mm and zero of circularscale division coincides with 25 divisions above thereference level. If screw gauge has a zero error of–0.004 cm, the correct diameter of the ball is(a) 0.521 cm (b) 0.525 cm(c) 0.053 cm (d) 0.529 cm (NEET 2018)8. In an experiment, four quantities a, b, c and d aremeasured with percentage error 1%, 2%, 3% and4% respectively. Quantity P is calculated as follows3 2abP =cd. % error in P is(a) 7% (b) 4% (c) 14% (d) 10%(NEET 2013)9. A student measures the distance traversed in free fallof a body, initially at rest, in a given time. He uses thisdata to estimate g, the acceleration due to gravity. Ifthe maximum percentage errors in measurement ofthe distance and the time are e 1 and e 2 respectively,the percentage error in the estimation of g is(a) e 2 – e 1 (b) e 1 + 2e 2(c) e 1 + e 2 (d) e 1 – 2e 2 (Mains 2010)10. If the error in the measurement of radius of a sphereis 2%, then the error in the determination of volumeof the sphere will be(a) 8% (b) 2% (c) 4% (d) 6% (2008)11. The density of a cube is measured by measuringits mass and length of its sides. If the maximumerror in the measurement of mass and lengths are3% and 2% respectively, the maximum error in themeasurement of density would be(a) 12% (b) 14% (c) 7% (d) 9%. (1996)12. Percentage errors in the measurement of mass andspeed are 2% and 3% respectively. The error in theestimate of kinetic energy obtained by measuringmass and speed will be(a) 8% (b) 2% (c) 12% (d) 10%. (1995)
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33 Years NEET-AIPMT Chapterwise Solutions - Physics 2020

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