1. 1. Derive the equation S = u t + 1/2 at ² using graphical method where the terms have usual meaning.

1. 1. A car travels the first third of a distance with a speed of 10 kmph, the second third with a speed of 20kmph and the last third with a speed of 60kmph. Calculate the average speed of the car for the entire distance.

1. 1. A bus starting from rest moves with a uniform acceleration of 0.2 m/s² for 60 seconds. Find the speed acquired by the bus and its distance travelled.

1. 1. A spherical ball is dropped from the top of a building and simultaneously another identical ball is thrown horizontally with some velocity from the same place. Which ball lands first? Explain your answer.

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

1. 1. Position-time graphs and Velocity-time graphs.

LESSION – 3 – Motion in a Plane (4 MARKS IMPORTANT QUESTIONS)

1. 1. A person in a running train projected a ball in vertically upward direction. What is the path of the ball observed by a person?

1. 1. sitting inside the train

1. 1. standing outside the train

1. 1. A ball is dropped from the roof of a tall building and simultaneously another ball thrown horizontally with some velocity from the same roof. Which ball lands first explain your answer?

1. 1. State parallelogram law of vectors. Derive an expression for the magnitude and direction of the resultant vector?

1. 1. Show that the path of a projectile is a parabola with necessary diagram?

1. 1. Show that the maximum height reached by a projectile when it is projected at an angle of 45° is equal to one fourth of its range?

1. 1. What are the properties of scalar product.

1. 1. |a+b|=|a-b| prove that the angle between a and b is 90°?

1. 1. Define range and obtain an expression for range of the projectile in terms of initial velocity and angle of projection?

1. 1. Define time of flight and obtain relation between time of flight and range of the projectile.

LESSION – 4 – Laws of Motion (4 MARKS IMPORTANT QUESTIONS)

1. 1. Explain the advantages and disadvantages of friction?

1. 1. Give the methods used to reduce the friction?

1. 1. What is kinetic friction and give the laws of static friction?

1. 1. Why is pulling the lawn roller preferred instead of pushing it?

1. 1. State the laws of rolling friction?

1. 1. State Newton’s second law of motion. Hence derive the equation of motion F = ma from it?

LESSION – 6 – System of Particles and Rotatory Motion

(4 MARKS IMPORTANT QUESTIONS)

1. 1. Distinguish between center of mass and center of gravity?

1. 1. Define vector product. Explain the properties of vector product.

1. 1. Define angular acceleration and torque and obtain the relation between angular acceleration (α) and torque (τ)?

1. 1. Find the torque of a force 7i + 3j – 5k about the origin. The force act on a vertical whose position vector is i – j + k? (where i, j and k are unit vectors along x, y and z axes respectively)

1. 1. Define angular velocity? derive the relation between linear velocity and angular velocity i.e. v = rω?

1. 1. Find the center of mass of three particles at the vertices of an equilateral triangle. The masses of the particles are 100 g, 150g, and 200g respectively. Each side of the equilateral triangle is 0.5 m long; 100 grams mass is at origin and 150g mass is on the X-axis.

LESSION – 7 – Gravitation (4 MARKS IMPORTANT QUESTIONS)

1. 1. Explain Kepler’s laws of planetary motion with necessary diagrams?

1. 1. Define orbital velocity? Obtain an expression for it?

1. 1. What is escape velocity? Obtain an expression for it and give the relation between orbital velocity and escape velocity?

1. 1. What is a geostationary satellite? Explain the uses geostationary satellites.

1. 1. Derive the relation between acceleration due to gravity(g) at the surface of a planet   of mass M, and Gravitational constant(G).

LESSION – 8 – Mechanical Properties of Solids

(4 MARKS IMPORTANT QUESTIONS)

1. 1. Define strain energy and derive the equation for the same?

1. 1. Define Young’s modulus, Bulk modulus and shear modulus.

1. 1. Describe the behaviour of a wire under gradually increasing load.

1. 1. Define stress and explain different types of stress.

1. 1. Explain the concept of Elastic Potential Energy in a stretched wire and hence obtain the expression for it.

1. 1. Define strain and explain the types of strain.

LESSION – 9 – Mechanical Properties of Fluids

(4 MARKS IMPORTANT QUESTIONS)

1. 1. Explain hydraulic lift and hydraulic brakes.

1. 1. What is Torricelli’s law? Obtain an expression for speed of efflux of water coming from a water tank.

1. 1. Explain how Venturi meter used to determine the speed of liquid.

1. 1. What is Reynold’s number. Explain is significance.

1. 1. Explain Stoke’s law.

LESSION – 10 – Thermal Properties of Matter

(4 MARKS IMPORTANT QUESTIONS)

1. 1. What is anomalous behaviour of water and explain how the anomalous behaviour of water advantages to aquatic animals?

1. 1. Give the reason for pendulum clock goes faster in winter slower in summer?

1. 1. Explain conduction, convection and radiation with example?

1. 1. Write a short note on triple point of water.

1. 1. At what temperature Fahrenheit scale and ⁰C scale shows same value? Obtain it.

1. 1. Explain Newton’s law of cooling.

1. 1. Explain the concept of bimetallic strip. How it is useful.

1. 1. Give the differences between heat and temperature.

1. 1. Explain about co-efficient of thermal conductivity and write an expression for it.

LESSION – 12 – Kinetic Theory of Gases

(4 MARKS IMPORTANT QUESTIONS)

1. 1. What are the assumptions of Kinetic theory of gases?

1. 1. Prove that the mean kinetic energy of molecules of an ideal gas is directly proportional to the temperature of the gas.

1. 1. Find the ratio of rms speed of oxygen and hydrogen molecules at the same temperature.

LESSION – 14 – Waves (4 MARKS IMPORTANT QUESTIONS)

1. 1. Define longitudinal and transverse waves and give examples.

1. 1. What are the differences between longitudinal and transverse waves?

1. 1. What are beats? Explain their occurrence and give their uses.