Jr. Inter Physics Model Paper 1

SECTION - A
Note: a) All questions are of very short answer type.
c) Each question carries 2 marks. 10 \$ 2 = 20
1. "Equations v = u+at and v2 = u2+2as can be derived by method of dimensional analysis''. Is this statement correct or not? why?
2. What is coefficient of restitution? Mention its values under different conditions.
3. A particle of mass 2Kg moves with velocity 2 i Λ +3 Λ jms-1, and
another particle of mass 3Kg moves with velocity 4 Λ i-6 Λ jms-1.
Find the velocity of centre of mass of this system.
4. What is angle of friction? What is the relation between the angle of friction and the coefficient of friction?
5. What is radius of gyration? On what factors it depends?
6. What is schwarzchild radius? Write an expression for it and mention the factors in the equation.
7. A drop of mercury at 20°C has radius 3mm. Surface tension of mercury at that temperature is 4.65×10-1Nm-1. What is the excess pressure inside the mercury drop?
8. Can you find any substance that contracts upon heating? Give an example.
9. Certain mass of ice is converting into water form. Is this process Isothermal? or Adiabatic? Why?
10. Top of the ceilings of houses are generally painted white in summer. Why?

SECTION - B
Note: a) All questions are of short answer type.
c) Each question carries 4 Marks. 6 \$ 4 = 24
11. Write the law of parallelogram law of forces. Derive expressions
for the magnitude of the resultant and the direction.
12. Show that the path of a projectile is a parabola.
13. Explain why it is easier to pull the lawn roller than to push it.
14. Write the principle of conservation of angular momentum and mention two applications.
15. Derive an expression for the variation of 'g' with altitude (h).
''It is erroneous to conclude that at h = R/2, g = 0; R is the radius of the earth''. Explain why this statement is correct?