NEW TRUST SCIENCE ACADEMY

Physics 9^th  

             Phase-1                                                                                                                            UNIT 9

Name: ______________                                                                                                           Date:____________________

Q.1 Tick the correct answer.                                                        (1*5=5)

1. In which of the following molecules do not leave their positions?

• liquid s                            solids                           gases                          none

1. The density of substance can be found with the help of?

• Newton’s law                         Pascal’s law       Hook’s law               Archimedes principle
• What should be the approximate length of glass tube to construct a water barometer?
• 1m                             5m                          1.5m                            0.5m

1. One Pascal=……..???

• 101325Nm                     1Nm                 1Nm^-1                               1 Nm^-2

1. The S.I unit of young’s modulus is?

• Nm                                  Nm^-1                    Nm^-2                                    Nm^-3

Q#2 Answer the following.                                          (2*8=16)

1. Define elastic limit and up thrust.
2. Why a heavy ship floats over water but a piece of stone sinks in water.
3. Define density also give its formula and S.I units.
4. Define elasticity and elastic limit.
5. State Hooke’s law.
6. Define stress and tensile strain.
7. Why mercury is preferred over water as a thermometric material?
8. State principle of flotation.

Q#3 write detail note on following.                                       (5+4=9)

(a) A steel wire of cross sectional area 2*10^-5m² is stretched through 2mm by a force of 4000N. Find Young’s modulus of the wire the length of wire is 2m. (4)

(b)   Define and explain Archimedes principle.  (5)

BEST OF LUCK…!