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M P Keshari » ICSE (IX) GUESS PAPER IN PHYSICS FOR 2012.

ICSE (IX) GUESS PAPER IN PHYSICS FOR 2012.

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ICSE (IX) Guess Paper in Physics for 2012.

Time 1 ½ hrs]                                 Physics                              [Max. Marks = 80.

Section – I (40 Mark)

Answer ALL questions.

Q.1.

(a) State whether the following are scalar or vector quantities :

(i) Speed          (ii) Force          (iii) Acceleration         (iv) Displacement                    (v) Distance     (vi) Energy             (vii) Velocity               (viii) Retardation.        [2]

(b) Give the SI and CGS unit of :

(i) Velocity                              (ii) Acceleration.                                             [2]

(c) What is meant by force? State the SI and CGS unit of force.                              [2]

(d) State two advantages of friction.                                                                          [2]

(e) Can longitudinal waves travel in solid, liquid and gas?                                        [2]

(f) State the following terms with respect to sound waves.

(i) Amplitude                          (ii) Frequency.                                                 [2]

(g) State the law of floatation. What is the waterline?                                               [2]

(h) State the principle of moments. Draw a diagram to illustrate the moment of couple.[2]

(i) Can the centre of gravity be situated outside the body? Explain your answer with two examples.                                                                                                                     [2]

(j) Explain why a man leans forward while climbing up a hill.                                   [2]

(k) Distinguish between heat and temperature.                                                          [2]

(l) What is the temperature of a healthy person on :

(i) Celsius scale                       (ii) Fahrenheit scale.                            [2]

(m) Define co-efficient of linear expansion of a solid and state its unit.                   [2]

(n) Explain what is meant by anomalous expansion of water.                                    [2]

(o) Name the mode of transmission of heat in :

(i) Solids                      (ii) Liquids

(iii) Gases                    (iv) Through vacuum.                          [2]

(p) Define the following terms :

(i) Absolute humidity

(ii) Relative humidity.                                                                                     [2]

(q) Explain the following with reference to spherical mirror :

(i) Aperture                             (ii) Focus

(iii) Pole                                   (iv) radius of curvature.                                  [2]

(r) Identify conductors and insulators from the list :

(i) Silver          (ii) Glass          (iii) Human body         (iv) Rubber

(v) Mica           (vi) Silk           (vii) Plastic                  (viii) Wood.                 [2]

(s) Draw a simple electric circuit when the following components are given :

(i) Cell                         (ii) Load                      (iii) Key

(iv) Ammeter               (v) Voltmeter              (vi) Rheostat.                          [2]

(t) Define the following terms :

(i) Magnetic pole                     (ii) Magnetic meridian

(iii) Magnetic equator (iv) Geographic meridian.                               [2]

 

Section – II (40 Marks)

Answer ANY FOUR questions.

Q.2.

(a) State the effects that a force can produce and give an example in each case.      [3]

(b) A force of 400 N produced an acceleration of 5 ms –2 on a body. Calculate the mass of the body.                                                                                                                    [3]

(c) Explain two ways to reduce and two ways to increase friction.                           [4]

Q.3.

(a) State Archimedes’ Principle. Describe an experiment to verify Archimedes’ Principle. Draw a neat labeled diagram of a hydrometer.                                                       [4]

(b) A uniform metre scale of weight 50 gf is balanced at 40 cm mark, when a weight of 100 gf is suspended at 5 cm mark. Where must a weight of 80 gf be suspended to balance the metre scale?                                                                                                        [3]

(c) Change –100º C to the Kelvin scale.                                                                     [3]

Q.4.

(a) What do you mean by real expansion and apparent expansion of liquid. Describe an experiment to explain the fact.                                                                             [3]

(b) What are land and sea breezes? What part does conduction and convection play in this.                                                                                                                                   [3]

(c) What is a green house? How does air inside it remain warm?                              [4]

Q.5.

(a) What is a pinhole camera? State the principle on which the pinhole camera is constructed.                                                                                                                    [3]

(b) State the law of reflection. Describe an experiment to verify the laws of reflection. [3]

(c) State the uses of plane mirror. Explain the term lateral inversion with the help of a diagram.                                                                                                                 [4]

Q.6.

(a) State the nature of image obtained in a convex mirror. Write four uses of convex mirror. Explain why is it used as a rear view mirror in cars.                                            [3]

(b) Draw a ray diagram for the following position of the object, by using:

(i) convex and             (ii) concave mirror.                                                      [4]

(c) Describe an experiment to show that sound requires a material medium for its propagation.                                                                                                                  [3]

Q.7.

(a) State the two purposes of an electroscope. Describe the pith ball electroscope. Describe an experiment using a pith ball electroscope to demonstrate that like charges repel and unlike charges attract.                                                                               [3]

(b) A gold leaf electroscope is given a positive charge so that the leaves are partially diverged. How is the divergence of the leaves affected, when :

(i) A positive charge is brought near the cap; (ii) A negative charge is brought near the cap; (iii) An uncharged object, such as the hand is brought near the cap?                   [4]

(c) Describe an experiment to show that the charge developed on each conductor are equal and opposite.                                                                                                             [3]

Q.8.

(a) What do you mean by the term an electric current? State the S.I. unit of electric current. Name the device to measure electric current.                                             [3]

(b) Define volt. What is voltmeter? What do you understand the terms :

(i) Open circuit                        (ii) Closed circuit.                               [3]

(c) What is an electric cell? What are series and parallel connection? Draw a diagram to illustrate each (connection) in case of three bulbs, sand give comments on the brightness of each bulb (for each connection).                                                                               [4]

Q.9.

(a) What is a natural magnet? What are its properties? State the advantages of an artificial magnet over a natural magnet.                                                                                   [3]

(b) What are the poles of a magnet? Is it possible to isolate the poles of a magnet? What is length of a magnet?                                                                                        [3]

(c) (i) Explain the term magnetic induction with suitable example.

(ii) ‘Induction precedes attraction’. Explain.

(iii) You are given a piece of steel. How will you check whether it is a magnet if : (1) A magnet is available (2) No magnet is available.                                                     [4]

 

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