Note :- Attempt six question in all ,selecting Three questions from section ‘A’ two questions from section ‘B’ and one question from section ‘C’
1.(a) Derive the equation 2aS = vf2 – vi2 . (05)
(b) Write the contribution of each of the following in the field of physics. (04)
(i) Al – Beruni (ii) Yaqoob Al- kindi.
(c) A mass of 10 kg at the end of a string is being whirled in a circle of radius Sm with a speed of 4m/s. what will be the centripetal force? (03) .
(d) One milliampere= 10-3 ampere. (01)
2.(a) State Pascal’s Law and explain the working of a hydraulic brake system with the help of diagram . (05)
(b) Write two points of differences between the following.
(i) Scalar and Vector quantities (ii) ‘g’ and ‘G’
(c) A car moving with a velocity of 36 km /hr is brought to rest in 5 seconds; find its deceleration. (03)
(d) The point at which the whole weight of a body appears to act is called center of gravity. (01)
3.(a) Define Newton’s law of Gravitation and find the equation for the mass of earth with the help of the formula (05) F = G m1 m2 / r2
(b) A 100 kg car is accelerated from at rest at 4 m/s 2 for 10 seconds, calculate the work done.
(c) State the following Laws:- (i)Hooke’s Law (ii) Law of inertia (iii) Law of Conservation of energy (03)
(d) Steam produces more severe burn on the body than the hot water. (Give the scientific reason.) (01)
4.(a) Draw a labelled diagram of a refrigerator and describe the working of its main parts.
(b) Write two points of difference between the following.
(i) Distance and displacement (04)
(ii) Kinetic Energy and Potential Energy (03)
(c) Define the following terms:
(i) Elasticity. (ii) Newton (unit) (iii) Force
(d) The fundamental unit of length in S.I. system is meter.
5.(a) Define evaporation and write any four factors on which the rate of evaporation depends .
(b) What is Kinetic Energy of a 200 kg car which is traveling with a velocity of 36 km /hr? (04)
(c) Write three methods of reducing friction. (03)
(d) Mechanical Advantage of a screw jack (M.A.)=2~/d
6.(a) With the help of labelled diagram ,explain the working of an electric bell. (04)
(b) A body is kept at a distance of 10 cm from a concave mirror. The radius of curvature of the mirror is 10 cm, find the position and nature of the image. (04)
(c) Define the following:- (03)
(i) Focal length (ii) Farad (iii) Critical angle.
(d) The device which collects the charge is called capacitor.
7 .(a) Explain the working of a compound microscope with the help of a ray diagram. (04)
(b) Write two points of difference between the following. (4)
(i) Direct current’s and alternating current.
(ii) Real image and virtual image.
(c) Define coulomb’s law and derive its formula: (03)
(d) The substance used as a medium between the two plates of a capacitor is called Dielectric.
8.(a) With the help of a ray diagram showing the nature, size, and position of the image formed in a concave mirror when:
(i) the object is placed beyond ‘C’
(ii) the object is placed between ‘C’ and ‘F’
(b) Find the current passing through the heater which has a resistance of 20 ohms and a potential difference of 220 V is supplied to it. (04)
(c) Define photon and write two of its characteristics. (03)
(d) If a low resistance is connected parallel to a galvanometer, it is converted into Ammeter. (01)
9.(a) Define loudness of sound .Give any three factors on which it depends. (04)
(i) Alpha Rays and Beta Rays
(ii) Fission Reaction and Fusion Reaction.
(c) Write three advantages of a Transistor. (03)
(d) The number of protons in a nucleus is called Atomic Number.
10.(a) Define Radio- Isotopes and write any three uses of radio- isotopes in industry. (04)
(b) When a sound wave of frequency 200 Hz and wavelength 3 m passes through a medium, calculate the velocity of the wave in that medium. (04)
(c) Define the following (03)
(i) Time period (ii) Amplitude (iii) Doping
(d) The sound of the explosion on the sun is not heard on the earth. (Give the scientific reason.) (01)