The lower and upper fixed points of a mercury-in-glass thermometer are marked X and 180 mm respectively. On a particular day the mercury meniscus in the thermometer rises to 60mm. If the corresponding reading on a Celsius scale is 20 ° C, what is the value X?

When water is heated between 0°C and 4°C, it's density

If N.E.P.A. charges 65 kobo per kilowatt-hour for electricity supplied to consumers, what bill would an electric iron rated at 750 watts attract when used for 24 hours?

An object is placed 15cm in front of a concave mirror of focal length 20cm. The image formed is

Given the same amount of beat, a quantity of water will reach a higher temperature in a brass pot than in a clay pot of the same mass because