1. VERY SHORT QUESTIONS:
QUESTION NO-1
1. What is the discovery of C.V. Raman?
2. What are the fundamental forces in nature?
3. What is the contribution of S. Chandra Sekhar to physics?
4. What is physics?
5. Which of the following has symmetry?
a) Acceleration due to gravity
b) Law of gravitation
6.Express unified atomic mass unit in kg.
7.How can systematic errors be minimized or eliminated?
8. Distinguish between fundamental units and derived units.
9. Why do we have different units for the same physical quantity?
10.Distinguish between accuracy and precision.
11.What are the significant numbers? Write the number of significant digits in the measurement of 0.002308.
12. What is the acceleration of a projectile at the top of its trajectory?
13.(a) Two forces of magnitudes 3 units and 5 units act at 60º with each other. What is the magnitude of their Resultant?
(b) When two right angled vectors of magnitude 7 units and 24 units combine, what is the magnitude of their resultant?
14. (a) A=i+j. What is the angle between the vector and x-axis?
(b) The vertical component of a vector is equal to its horizontal component. What is the angle made by the vector with x-axis?
15.If P=2i+4+14k and Q = 4+4+10k find the magnitude of P+Q.
16. Can a vector of magnitude zero have a non-zero components?
17.What happens to the coefficient of friction, if the weight of the body is doubled?
18. Can the coefficient of friction be greater than one?
19. A horse has to pull harder during the start of the motion than later. Explain.
20.If a bomb at rest explodes into two pieces, the pieces must travel in opposite directions. Explain.
21. What is inertia? What gives the measure of inertia?
22.Why does the car with a flattened tyre stop sooner than the one with inflated tyres?
23. A batsman hits back a ball straight in the direction of the bowler without changing its initial speec m/s. If the mass of the ball is 0.15 kg. determine the impulse imparted to the ball. (Assume linear of the ball)
24.
(a) Give the expression for the excess pressure in a soap bubble in air.
(b) If the diameter of a soap bubble is 10mm and its surface tension is 0.04N/m. Find the excess inside the bubble
25.Why are drops and bubbles spherical?
(a) Give the expression for the excess pressure in a liquid drop
(b) Give the expression for the excess pressure in an air bubble inside the liquid.
26.What are water proofing agents and water wetting agents? What do they do?
27. What is hydrostatic paradox?
28.What is the principle behind the carburettor of an automobile.
28.What is Magnus effect?
29.What is angle of contact? What are its values for pure water and mercury?
30.Define average pressure. Mention its units and dimensional formula. 4.
31. Define viscosity? What are its units and dimensions?
32. Mention any two applications of Bernoulli’s theorem.
33. Why gaps are left between rails on a railway track?
34. Can a substance contract on heating? Give an example.
35.Can a substance contract on heating? Give an example.
36.Distinguish between heat and temperature.
37. What are the lower and upper fixing points in Celsius and Fahrenheit scales?
(a) What is latent heat of vaporization?
(b) What is latent heat of fusion?
38. Does a body radiate at heat 0°K? Does it radiate at heat 0°C?
39. State Wien’s displacement law?
40.Why utensils are coated black? Why is the bottom of the utensils made of coppe
41. What is greenhouse effect? Explain global warming?
42. State Newton’s law of cooling?
43. The roof of buildings are often painted white during summer. Why?
44.Define mean free path.
45. State Dalton’s law of partial pressures.
46.When does a real gas behave like an ideal gas!
47. What is the expression between pressure and kinetic energy of a gas molecule?
48. What is the law of equipartition of energy?
49. State Boyle’s Law and Charles Law.
50. If the absolute temperature of a gas increased to 3 times, what will be the increase i the gas molecule?
51. When pressure increases by 2%. What is the percentage decreases in the volume of Boyle’s law is obeyed.
52. Explain the concept of degrees of freedom for molecules of a gas.
53.What is the ratio of r.m.s. speed of Oxygen and Hydrogen molecules at the same temperature?
54. Is it necessary that a mass should be present at the centre of mass of any system?
55.Why are spokes provided in a bicycle wheel?
56. By spinning eggs on a table top, how will you distinguish a hardboiled egg from a raw egg?
57. If the polar ice caps of the earth were to melt, what would the effect of the length of the day be?
58. What is the moment of inertia of a rod of mass M. Length about an axis perpendicular to it through one end?
SHORT ANSWER QUESTION:
1. A car travels the first third of a distance with a speed of 10kmph, the second third at 20kmph and the last third at 60kmph. What is its mean speed over the entire distance?
2. A ball is dropped from the roof of a tall building and simultaneously another ball is thrown horizontally with some velocity from the same roof. Which ball lands first? Explain your answer.
3. A man runs across the roof of a tall building and jumps horizontally on to the (lower) roof of an adjacent building. If his speed is 9 m/s and the horizontal distance between the building is 10m and the height difference between the roofs is 9m, will he be able to land on the next building. (Take g = 10 m/s²).
4.Explain the terms the average velocity and instantaneous velocity. When are they equal?
5. Derive the equation x = vol+ 1/2 at² using graphical method where the terms have usual meaning.
6. 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.
7.State parallelogram law of vectors. Derive an expression for the magnitude and direction of the resultant vector.
8.Show that the trajectory of an object thrown at certain angle with the horizontal is a parabola..
9.
(b). Show that the maximum height reached by a projectile launched at an angle of 45° is one quarter of its range.
10. Define Unit vector, Null vector and Position vector.
11.Explain advantages and disadvantages of friction.
12. Mention the methods used to decrease friction.
13.Define the terms momentum and impulse. State and explain the law of conservation of linear momentum.Give examples.
14.State the laws of rolling friction.
15.Explain the terms limiting friction, dynamic friction and rolling friction.
16. Define angular velocity (w). Derive V = ro
17. Distinguish between centre of mass and centre of gravity.
18. Find torque of a force 7i+3j-5k about the origin, The force acts on a particle whose position vector is i-j+k.
19. State and prove the principle of conservation of angular momentum. Explain the principle of conservation of angular momentum with examples
20. Find the scalar and vector products of two vectors a = a=3i-4j+5k and b = -2i+j-3k
21.Define angular acceleration and torque. Establish the relation between angular acceleration and torque.
22.Define vector product. Explain the properties of vector product with two examples
23. Find the centre of mass of three particles at the vertices of an equilateral triangle. The masses of the particles are 100-gram, 150 grams and 200 grams respectively. Each side of the equilateral triangle is 0.5m long.
24.Write the equation of motion for a particle rotating about a fixed axis.
25.When 100J of work is done on a fly wheel, its angular velocity is increased from 60 rpm to 180 rpm. What is the moment of inertia of the wheel?
26.What is a geostationary satellite? State its uses.
27. What is escape velocity? Obtain an expression for it.
28. What is orbital velocity? Obtain an expression for it.
29.State Kepler’s laws of planetary motion.
30. Derive the relation between acceleration due to gravity(g) at the surface of a planet and Gravitational constant(G).
31.The wenght of an object is more at the poles than at the equator. At which of these can we get more sugar For the same weight? State the reason for your answer.
32. Define Young’s modulus, Bulk modulus and shear modulus.
33.Describe the behaviour of a wire under gradually increasing load.
34.Define stress and explain the types of stress.
35. Explain the concept of Elastic Potential Energy in a stretched wire and hence obtain the expression for it.
36.Define strain and explain the types of strain.
37. Pendulum clocks generally go fast in winter and slow in summer. Why?
38. In what way is the anomalous behaviour of water advantageous to aquatic animals?
39.Explain conduction, convection and radiation with example.
40. Explain Celsius and Fahrenheit scales of temperature. Obtain the relation between Celsius and Fahrenheit scales of temperature.
41. Write a short note on triple point of water.
LONG ANSWER QUESTIONS:
42.(a) What are collisions? Explain the possible types of collisions? Develop the theory unlocity of approach of two colliding bodies
imensional.
qual to the
ic mass unit is k