PHYSICS REVISION ( class 7 )

1) Define the term measurement.
2) What are fundamental physical quantities?
3) Give four examples of fundamental and four examples of derived physical quantities.
4) Define:- length,area,volume,mass,weight,time period, amplitude of a simple pendulum and effective length of a simple pendulum.
5)Mention 2 factors on which the time period of a simple pendulum depends.

decimal problems (cottonians)

1) A boy had 3 ropes,their lengths were 4.4m, 3.09m and 2.25m. What was the total length of the ropes?
2) A bag of sand weighed 35.75kg, if some sand fell out and the bag now weighed 29.25 kg, what was the weight of the sand that fell out?
3) The cost of a pen is Rs. 12.4, what will be the cost of 5 similar pens?

HEAT

1) Explain with the help of an experiment to show thermal expansion.
2)Explain with the help of an experiment to show that gases expand on heating.