1. Choose the correct answer for each from the given options:
(i)The book ‘Kitab-ul-Manazir’ is written by:
(ii)1 picosecond = -······· second
(iii )The rate of change of velocity is known as:
(iv) Newton’s First Law of Motion gives the concept of:
(v)Negative of a vector is that vector which is equal in magnitude, but
(vi)If the centre of gravity of a body is lower than its point of support, then its equilibrium will be:
(vii) The mass of the earth is:
(viii) The S.I. Unit of energy is:
(ix)It is a second kind of lever:
(x)Archimedes’ Principle is applied to determine
(xi)The conversion of liquids into vapours at all temperatures is called:
(xii) Sound waves are
(xiii) For total internal reflection the angle of incidence must be •••••••• the critical angle:
(xiv)A ray of white light thrown onto a glass-prism cannot be
(xv)Three resistances of 3 n are connected in parallel. Their total resistance will be;
(xvi) To measure potential difference the voltmeter is always connected in the circuit in:
(xvii) The elements having atomic number greater than 82 are called:
Note: Answer any 14 questions from this section.
2. Define Physics and write the names of its any four branches
3.Write S.I units of the following physical quantities:
(i) length (ii) electric current (iii) pressure (iv) work (v) volume (vi) force
4.The velocity of a car increases by an acceleration of 2 m/s^2 and becomes 20 m/s in 5 seconds. Find the initial velocity of the car.
5.Write three differences between Mass and Weight.
6.Define Torque. Write down its unit and formula.
7. State Newton’s Law of Gravitation & derive F =G m1 m2 / r^2
8. Define Work and Energy. State the Law of Conservation of Energy.
9. Find the two rectangular components of a force of 100N which is acting at an angle of 60° with X-axis (sin 60° = 0.866, cos 60° = 0.5)
10. Define the following: (i) Lever (ii) Inclined Plane (iii) Pully
11. State the following laws I principles: (i) Hooke’s Law (ii) Pascal’s Law (iii) Archimedes’ Principle
12. Calculate the length of a Second’s Pendulum (g=10ms^-2)
13. Write three characteristics of the image formed in a plane mirror.
14. Find the focal length of a convex lens if p = 5cm, q = 10cm and the image formed is virtual.
15. Define ‘Reflection of Light’. State the two Laws of Reflection of Light.
16.Define the following: (i) Dispersion of light (ii) Photon (iii) Rainbow
17. State the following laws: (i) Coulomb’s Law (ii) Ohm’s Law (iii) Joule’s Law
18. Three resistances of 4 Ohm, 6 Ohm, and 12 Ohm are connected in parallel with a source of 6 volts. Find the current flowing through the circuit.
19. What is an Ammeter? How is a Galvanometer changed into an ammeter? Als,o state how an ammeter is connected in an electrical circuit?
20. Define the following: (i) Electronics (ii) Doping (iii) Rectification
21. The half-life of Radium is 1600 years. Find the amount of Radium left after 4800 years, if its mass is 60g.
22. How much amount of heat is required to raise the temperature of 800 g of iron through 50°c? (Specific heat . of iron = 499.8 J/kg0
NOTE: Attempt 2 questions from this section
23.(a) Derive: S= Vit+1/2 at^2 (05)
(b) State Newton’s Second Law and Third Law of Motion and derive: F = ma. (04)
(c) Draw a Ray Diagram of a Compound Microscope and describe its working. (04)
24.(a) State Boyle’s Law & Charles’ Law. Also derive PV = nRT.
(b) Write two differences between (04)
(i) Stress and Strain. (ii) Kinetic Energy and Potential Energy.
(c) Write two advantages and two disadvantages of Friction
25.(a) With the help of a labeled diagram, explain the construction and working of an Electrical Bell. (05)
(b) Define the following:
(i) Surface Tension (ii) Viscosity (iii) Orbital velocity (iv) Couple (04)
(c) Write two differences between (04)
(i) p-type substance and n-type substance (ii) Fission reaction and Fusion reaction.