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The temperatures of two bodies measured by a thermometer are $t_{1}=20^{\circ} C \pm 0.5^{\circ} C$ and $t_{2}=50^{\circ} C \pm 0.5^{\circ} C$ Calculate the temperature difference and the error theirin.
The photograph of a house occupies an area of $1.75\; cm^2$ on a $35\; mm$ slide. The slide is projected on to a screen, and the area of the house on the screen is $1.55\; m^2$. What is the linear magnification of the projector-screen arrangement
The least count of the main scale of a screw gauge is $1\, mm$. The minimum number of divisions on its circular scale required to measure $5\,\mu m$ diameter of a wire is