The length of a strip measured with a meter rod is 10.0 cm. Its width measured with a vernier callipers is 1.00 cm. The least count of the meter rod is 0.1 cm and that of vernier callipers is 0.01 cm. What will be the error in its area?

Questions from Physical World, Units and Measurements

1. Which of the following relations is correct?

2. The pitch of a screw gauge having divisions on its circular scale is . When the two jaws of the screw gauge are in contact with each other, the zero of the circular scale lies division below the line of graduation. When a wire is placed between the jaws, linear scale divisions are clearly visible while division on the circular scale coincides with the reference line. The diameter of the wire is

3. The external and internal diameters of a hollow cylinder are measured to be cm and cm. The thickness of the wall of the cylinder is

4. The unit of magnetic flux is

5. unit of molar gas constant is

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2. The de Broglie wavelength of an electron moving with kinetic energy of is nearly

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3. A car starts from rest and accelerates at At , a ball is dropped out of a window by a person sitting in the car. What is the velocity and acceleration of the ball at ? (Take

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4. A wheel with metallic spokes each long is rotated with a speed of in a plane perpendicular to a magnetic field of . The induced emf between the axle and rim of the wheel will be,

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5. A barometer is constructed using a liquid (density What would be the height of the liquid column, when a mercury barometer reads ?
(density of mercury

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