# Junior Inter Physics – Important Short Answer Questions for Public Exams

Following important short answer questions for Junior Intermediate Physics of AP and Telangana State Boards. The important questions are given from all the chapters from the examination point of view.

PART - I:

1) A parachutist flying in an aeroplane jumps when it is at a height of 3 km above ground. He opens his parachute when he is about 1 km above ground. Describe his motion.

2) A bird holds a fruit in its beak and flied parallel to the ground. It lets go of the fruit at some height. Describe the trajectory of the fruit as it falls to the ground as seen by (a) the bird (b) a person on the ground.

3) Show that the maximum height reached by a projectile launched at an angle of 45° is one quarter of its range.

4) State parallelogram law of vectors. Derive an expression for the magnitude and direction of the resultant.

5) What is relative motion? Explain it.

6) Show that a boat must move at an angle of 90° with respect to river water in order to cross the river in a minimum time?

7) Define unit vector, null vector and position vector.

8) If , prove that the angle between is 90°.

9) Show that the trajectory of an object thrown at certain angle with the horizontal is a parabola.

10) Explain the terms the average velocity and instantaneous velocity. When are they equal?

11) Show that the maximum height and range of a projectile are respectively where the terms have their regular meanings.

12) A stone of mass 0.1 kg is thrown vertically upwards. Give the magnitude and direction of the net force on the stone (a) during its upward motion ,(b) during the downward motion, (c) at the highest point where it momentarily comes to rest.

13) Define the terms momentum and impulse. State and explain the law of conservation of linear momentum. Give examples.

14) Why are shock absorbers used in motor cycles and cars?

15) Explain the terms limiting friction, dynamic friction and rolling friction.

17) Mention the methods used to decrease friction.

18) State the laws of rolling friction.

19) Why is pulling the lawn roller preferred to pushing it?

20) What is potential energy? Derive an expression for the gravitational potential energy.

21) A lorry and a car moving with the same momentum are brought to rest by the application of brakes which provide equal retarding forces. Which of them will come to rest in shorter time? Which will come to rest in less distance?

22) Distinguish between conservative and non-conservative forces with one example each.

23) Show that in the case of one dimensional elastic collision, the relative velocity of approach of two colliding bodies before collision is equal to the relative velocity of separation after collision.

24) Distinguish between centre of mass and centre of gravity.

25) Explain about the centre of mass of Earth-Moon system and its rotation around the sun.

26) Define vector product. Explain the properties of a vector product with two examples.

27) Define angular velocity ( ). Derive v = r .

28) Define angular acceleration and torque. Establish the relation between angular acceleration and torque.

PART - II

1) Define simple harmonic motion? Give two examples.

2) What is Phase? Discuss the phase relations between displacement velocity and acceleration in simple harmonic motion.

3) Obtain an equation for the frequency of oscillation of spring of force constant k to which a mass m, is attached.

4) Derive the expressions for displacement, velocity and acceleration of a particle executing SHM.

5) State Kepler's laws of planetary motion.

6) Derive the relation between acceleration due to gravity (g) at the surface of a planet and gravitational constant (G).

7) How does the acceleration due to gravity 'g' change for the same values of height (h) and depth (d).

8) What is Orbital velocity ? Obtain an Expression for it.

9) What is escape velocity ? Obtain an expression for it.

10) What is a Geostationary satellite? State its uses.

11) Define Hooke's law of elasticity, proportionality limit, permanent set and breaking stress.

12) Define modulus of elasticity, stress, strain and Poisson's ratio.

14) What is atmospheric pressure and how is it determined using Barometer?

15) What is gauge pressure and how is a manometer used for measuring pressure differences?

16) State Pascal's law and verify it with the help of an experiment.

17) Explain hydraulic lift and hydraulic brakes.

19) Explain how pressure varies with depth.

20) What is Torricelli's law? Explain how the speed of efflux is determined with an experiment.

21) What is Venturi-meter? Explain how it is used.

22) What is Reynold's number? What is it's significance?

23) Explain dynamic lift with examples.

24) Explain Surface Tension and Surface energy.

25) Explain how surface tension can be measured experimentally.

PART - III

1) Explain Celsius and Fahrenheit scales of temperature. Obtain the relation between Celsius and Fahrenheit scales of temperature.

2) Pendulum clocks generally go fast in winter and slow in summer. Why?

3) In what way is the anomalous behaviour of water advantageous to
aquatic animals?

4) Explain conduction, convection and radiation with examples.

5) Write a short notes on triple point of water.

6) Explain how Cp of a gas is greater than Cv?

7) State and explain first law of thermo dynamics.

8) Define two principal specific heats of a gas Which is greater and why?

9) Derive the relation between the two specific heat capacities of a gas on the basis of first law of thermodynamics.

10) Obtain an expression for the work done by and ideal gas during isothermal change.

11) Obtain an expression for the work done by an ideal gas during adiabatic change and explain.

12) Compare isothermal and an adiabatic processes.

13) How specific heat capacity of mono atomic, diatomic and poly atomic gases can be explained on the basis of Law of equipartition of energy?

The student must prepare all VSAQs of all chapters to get full marks.