Checked by:_______________ Rechecked by:_____________ Sign Invigilator:_____________
Q1. Circle the correct answer. (10)
1.What is the unit for strain?
a) no unit b) Nm-1 c) Nm-2 d) none of these
2.The attractive forces between the molecules of solid are
a) less weak b) very weak c) very strong d) none of these
3.Matter is composed of very small particles called
a) electrons b) protons c) molecules d) neutrons
4.The pressure of a gas in a container depends upon:
a) temperature b) type of a gas
c) volume of container d) shape of container
5.The S.I unit of young’s modulus is:
a) Nm b) Nm-2 c) Nm2 d) all
6.The density of a substance can be found with a help of :
a) Pascal’s law b) Archimedes principle
c) hook’s law d) principal of floatation
7.The S.I unit of density is
a) liter b) kgm-2
c) kgm-3 d) Nm
8.The molecules in gases are
a) closely packed b) loosely packed c) much far apart d) none of these
9.Mass per unit volume is called
a) pressure b) density c) weight d) stress
10.The liquid pressure will ______ with increase in depth
a) increase b) decrease c) not change d) none
Q2. Write short answers to these questions: (15)
1.Define the term pressure write its formula and S1 unit.
2.The density of air is 1.3 kg .. Find the mass of air in a room measuring 8mx5mx4m.
3.Why does the atmospheric pressure vary with attitude?
4.What is upthurst force.؟
5.What do you mean by young’s modulus?