[3 Mark Question Answer] - PHYSICS STD 6 Questions - Vidyadip

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Question 13 Marks

Explain the working of a beam balance.

Answer

A beam balance is the simplest instrument to measure mass (weight). In a beam balance, the mass of an object is measured by comparing it with standard masses called standard weights. A simple beam balance consists of a straight beam of a metal (generally iron), supported at its centre with the help of an iron loop. A pointer is fixed at the centre of the iron loop. Two identical pans are suspended at equal distances from the centre, at the two ends of the beam.

Working : The object whose mass has to be measured is placed on one of the pans (generally the right pan). Standard weights are placed on the other pan until the metallic beam becomes horizontal and the pointer becomes vertical. The sum total of all weights used gives the mass of the object.

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Question 23 Marks

Describe a method by which you can measure the volume of an irregular solid.

Answer

Aim : To measure the volume of an irregularly shaped stone. Materials Required : Some water, a measuring cylinder, a string and a small stone.

Procedure : Pour some water in the measuring cylinder and read its level from the scale’ marked on the wall of the container. Now tie the string around the stone and lower it into the cylinder without touching its walls until it is completely immersed in water. The level of water in the cylinder rises as the stone is immersed in it. Read the level of water again.Observation and conclusion : Initial reading of water level = 80 mL (say) Final reading of water level = 130 mL (say) Hence, the volume of the stone = 130 mL – 80 mL = 50 mL.

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Question 33 Marks

Describe the Celsius and Fahrenheit scales.

Answer

Celsium and Fahrenheit scales are two most common scales used to measure temperature.
The Celsius scale is named after Anders Celsius. The unit of temperature is degree Celsius (°C). The lower fixed point (at which ice melts or water freezes : ice point) is taken as O degree while the upper fixed point (at which water boils :

steam point) is taken as 100 degrees. The distance between these two fixed points is divided into 100 equal parts. Each of these divisions is called 1°C.
The Fahrenheit scale is named after Daniel Gabriel Fahrenheit. The unit of temperature is degree Fahrenheit (°F). The lower fixed point is taken as 32 degrees and the upper fixed point is taken as 212 degrees. The distance between these two points is divided into 180 equal parts. Each of these divisions is called 1°F.

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