CBSE Class 12 Term 2 Sample Paper 1

Unit Conversion MCQs and VSAs

SECTION – A (PHYSICS) 1. Give one-word answers (2 x ½ = 1) (i) Convert one quintal into grams ____________ (ii) Convert 100 centimetres into kilometre ____________ 2. Fill in the blanks. (2 x ½ = 1) (i) Measurement of a physical quantity consists of a ________ and the _______ of the unit. (ii) Measurement is the comparison of an _________ quantity with _______ quantity. 3. Write true or false. (4 x ¼ = 1) (i) Submultiples of standard units are used to make large measurements. _____________ (ii) In scientific work, accuracy of measurement is not required. _____________ (iii) We can measure similar quantities with different instruments. _____________ (iv) Accurate measurements are always necessary in our day-to-day life. _____________ 4. Choose the most appropriate answer. (4 x ¼ = 1) (i) Which one of these is not a reliable unit of measurement? a. Handspan ...

Tips for Isometric projection of machine blocks

Orthographic projection gives us views of objects from a particular direction only. Looking from the front, we get front elevation and from the top, we get a plan or the top view. The orthographic projection is complete in one direction only. To have an entire detail, we need to prepare at least three different views from three different directions. Still, for a quick reference, a pictorial view will be a better option. We have several ways of drawing pictorial drawings on a two-dimensional plane. It can be a perspective or oblique or isometric pictorial drawing. For Engineering Graphics, we usually use isometric projection to obtain the pictorial impression. In isometric projection, there are three principal axes inclined to each other at an angle of 120 degrees. The corresponding planes are the horizontal plane, the vertical plane, and the profile plane. For machine blocks, we usually practice with simple cubes, prisms, and pyramids with different orientations. The sol...

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