11430Phy Guess Paper

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Sample Paper 2013Class X

Subject PhysicsMarks: 80 Time: One Hour and a half Hour

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Answer to this paper must be written on the paper provided separately.You willnotbe allowed to write during the first 15 minutes.

This time is to be spent in reading the question paper.

The time given at the head of this paper is the time allowed for writing the answers.

Section- I is compulsory .Attempt any four question fromSection II.The intended marks for questions or parts of questions are given in the bracket

SECTION I (40 Marks)

Attempt all questions from this section.Question 1.

a) What are forced vibrations? Give one example. [2]

b) What do you mean by the statement power of a device is 200W? [2]c) How does the lateral displacement from a glass block changes when angle

of incidence is increased? [2]

d) What is the function of split ring and carbon brushes in DC motor? [2]e) Why fuse is put in live wire? [2]

Question 2.

a) A girl of mass 45 kg climbs up on stairs to a height of 12 meter. How muchenergy she has spent? [2]

b) What is the unit in which loudness and frequency of sound is measured? [2]c) Which lens always offer magnification less than 1? What is the nature of

image by this lens? [2]

d) What are two main uses of X- rays? [2]

e) Why devices in the house are put in parallel? [2]

Question 3.

a) What is electromagnetic induction? [2]

b) Why we cannot hear echoes in a small room? [2]c) What is thermionic emission? [2]

d) State two uses of radio isotopes. [2]

e) Why ice at 0o is more effective than water at 0o C [2]

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Question 4.

a) Why soldiers are asked to disperse while crossing the suspension bridge? [2]

b) Why a welder uses a special glass while welding? [2]

c) Calculate the height through which a body of mass 0.5 kg should be lifted if theenergy spent for doing so is 1.0 joule ( g= 10 m/s2) [2]

d) State the class of the following machine i) Ice tongs ii) Nut cracker iii) Scissors

iv) Punching machine [2]

e) Show by diagram how can a prism deviate a ray of light by 180o? [2]

SECTION I (40 Marks)

Attempt any four questions from this section.

Question 5a) Show that for the free fall of a body, the sum of the mechanical energy at any [3]

point in its path is constant.

b) A uniform meter scale of weight 50gf is balanced at 30cm mark when weights [4]of 80gf and 60gf act at 5cm mark and 45cm mark respectively. What force must

be applied at 20 cm mark to balance the meter.

c) What do you understand by equilibrium? Give examples of an object to be in [3]static and dynamic equilibrium.

Question 6

a) i)What are two essential conditions of Total internal Reflection ii) Explain why [3]

diamond sparkles so much?b) Which device other than a plane mirror is used to turn a ray of light through 90o? [4]

Draw the diagram in support of your answer. Is this device used in any instrument?

Name the instrument.

c) A man stands between two parallel cliffs and explodes a cracker. He hears first [3]

echo after 0.6s and secondecho after2.4 s. Calculate the distance between cliffs.

Question 7

a) The rear view mirror of a scooter starts vibrating violently at some particular [3]speed of the scooter i) Why does the rear- view mirror vibrate violently?

ii) What is the name of phenomenon which leads to violent vibrations?iii) What step should be taken to stop the violent vibrations?

b) What is Lenzs law? ii) What kind of energy changes takes place when a magnet

is moved towards a coil having a galvanometer at its ends? Name the phenomenon.

c) Draw a neat labeled diagram of an AC generator. [3]




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Question 8

a) Calculate the value of the resistance which must be connected to a 15 ohm [3]

resistance to provide an effective resistance of 6 ohm.b) What are ohmic and non- Ohmic resistors? Give at least one example of each. [4]

Also show their current voltage relationship.

c) An erect ,diminished and virtual image is formed when an object is placed [3]

between the optical centre and principal focus of a lens i) Name the type of lenswhich forms the above image ii) Draw a ray diagram to show the formation of

the image with the above characteristics.

Question 9

a) i) The thermal capacity of a vessel is 428 J/K. What do you understand by the [4]statement? ii) Calculate the amount of heat energy required to raise the temperature

of 200g of copper from 20oC to 70oC ( Sp. heat capacity of copper = 390 J/kg K)b) What is a calorimeter? Draw a neat labeled diagram of a calorimeter. Why is it [3]

made of copper?

c) What happens to the atomic number of an element when an i) Alpha particle [3]ii) Beta particle iii) Gamma particle is emitted?

Question 10

a) i) State two differences between a nuclear change and a chemical change [3]

.ii) Which radiation from a radioactive source causes maximum biological damage?

b) What do you mean by background radiations? Name its sources. Is it possible [4]for us to keep ourselves away from it?

c) The nucleus 2411Na emits a Beta particle to change into magnesium Mg i) Write [3]down the symbolic equation for this process. ii) What are the number 24 and 11

called and what do they signify for the nucleus Na?



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