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Reg.No: …………………………………….. 3075FEBRUARY 2012 Name: ………………………………………..

FIRST YEAR HIGHER SECONDARY EXAMINATIONPart III

PHYSICSMaximum: 60 Scores

Time: 2 hoursCool off time: 15 Minutes

1) Find Odd One Out

Frequency ,Angular Velocity, Curie, Impulse (1)

2) Velocity of water waves may depends upon their wave length λ, the density of water ρ, and theacceleration due to gravity g.Find the relation between these quantities by method of dimension

(2)

3) a) Can an Object be accelerated without speeding up or slowing down ? Explain by examples (1 )

b) A ball is thrown vertically upwards with velocity 20ms-1. It takes 4sec. to reach to its original

position. Draw velocity – time graph showing entire motion of the ball (2)

4) An object is moving along x-axis in such a way that its displacement is given by x = 30 + 20t2,Where ‘x’ is in metre and‘t’ in seconda) Find acceleration of the object (1)b) What will be initial and final velocities (2)

5) Show that for a projectile time of accent equals time of decent (1 )

6) A rectangular box of mass ‘m’ lies on a rough inclined surface of. The Coefficient friction betweenbox and surface is ‘μ’a) Arrive an expression for angle of inclination ‘φ’of the plane at which box just begin to slide

the plane (2)b) What will be force acting on the plane if angle of inclination of the plane is increased to ‘θ’

Such that θ greater than φ (2)c) Why mountain roads are generally made winding upwards rather than going straight up (1)

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7) Energy possessed by a body by virtue of motion is known as kinetic energya) Derive relation between linear momentum ‘p’ and kinetic energy ‘K’ (2)b) If momentum of the body is increased by 20% , what will be the increase in the kinetic energy

of the body (1 )

c) A body is moving unidirectionally under the influence of a source of constant power. S.T its

displacement in time‘t’ is proportional to t3/2 (1 )

8) The variation of angular position Θ of point on a rotating rigid body with time t is shown below.Is the body is rotating clockwise or anticlockwise

Θ

O t (1)

9) Characteristic of a rigid body rotating about an axis is known as moment of inertia, which isindependent of magnitude of angular speed of the rotating body

a) How can be calculate M.I of a rotating rigid body of mass, M? (1)b) What are the factors on which moment of inertia of rotating body depends upon? (1)c) Why two spheres of same mass and same radius, one Solid and other Hollow have unequal

moment of inertia? (1 )

d) A solid sphere roll down two different inclined planes of same height but different angles of

inclinations .Will it reach the bottom with the same speed in each case (1 )

10) Match the Following

(2)

A BAcceleration due to gravity - ( + )

Gravitational Field Nkg-1

Gravitational Potential GM/R2

Total energy of a satellite Jkg-1

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11) German Astronomer and Scientist Johannes Kepler formulated the three laws of planetarymotion based on the painstaking observations of Tycho Brahe and coworkers’ .These three

laws are known as Kepler’s Laws of Planetary motion.

a) Kepler’s which law used to find distance of planet from the Sun and states the Law (2)

b) Draw aerial velocity versus time graph for earth (1)

12) Material which regain original size and shape on removal of deforming force is known as elastic

a) Is stress a vector quantity. Why? (2)b) What is the Young’s modulus for a perfect rigid body? (1)c) Why modulus of elasticity of most materials decreases with the increase of temperature? (2)

13) One of the consequences of surface tension is that there exists a pressure difference across thecurved surface of a liquid.

a) Arrive an expression for excess pressure inside a liquid drop (2)b) Figure shows the two bubbles of different sizes formed at the end of a tube .When valve is

opened which of the two bubbles grow at the cost of other (1)

14) Degree of hotness of a body is known as temperature. There are different scales for measuringtemperature of a body. Most commonly used scales are Celsius scale and Fahrenheit scale.

a) Write the relation connecting Celsius temperature tC and Fahrenheit temperature tF (1)b) Using above relation express Absolute zero temperature on Fahrenheit scale (1)

15) Water has many unique properties like high specific heat capacity, anomalous expansion etc.

a) Show graphically variation of volume of 1kg. of water when its temperature increases from

0℃ ℃ (1 )

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11) German Astronomer and Scientist Johannes Kepler formulated the three laws of planetarymotion based on the painstaking observations of Tycho Brahe and coworkers’ .These three

laws are known as Kepler’s Laws of Planetary motion.

a) Kepler’s which law used to find distance of planet from the Sun and states the Law (2)

b) Draw aerial velocity versus time graph for earth (1)

12) Material which regain original size and shape on removal of deforming force is known as elastic

a) Is stress a vector quantity. Why? (2)b) What is the Young’s modulus for a perfect rigid body? (1)c) Why modulus of elasticity of most materials decreases with the increase of temperature? (2)

13) One of the consequences of surface tension is that there exists a pressure difference across thecurved surface of a liquid.

a) Arrive an expression for excess pressure inside a liquid drop (2)b) Figure shows the two bubbles of different sizes formed at the end of a tube .When valve is

opened which of the two bubbles grow at the cost of other (1)

14) Degree of hotness of a body is known as temperature. There are different scales for measuringtemperature of a body. Most commonly used scales are Celsius scale and Fahrenheit scale.

a) Write the relation connecting Celsius temperature tC and Fahrenheit temperature tF (1)b) Using above relation express Absolute zero temperature on Fahrenheit scale (1)

15) Water has many unique properties like high specific heat capacity, anomalous expansion etc.

a) Show graphically variation of volume of 1kg. of water when its temperature increases from

0℃ ℃ (1 )

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11) German Astronomer and Scientist Johannes Kepler formulated the three laws of planetarymotion based on the painstaking observations of Tycho Brahe and coworkers’ .These three

laws are known as Kepler’s Laws of Planetary motion.

a) Kepler’s which law used to find distance of planet from the Sun and states the Law (2)

b) Draw aerial velocity versus time graph for earth (1)

12) Material which regain original size and shape on removal of deforming force is known as elastic

a) Is stress a vector quantity. Why? (2)b) What is the Young’s modulus for a perfect rigid body? (1)c) Why modulus of elasticity of most materials decreases with the increase of temperature? (2)

13) One of the consequences of surface tension is that there exists a pressure difference across thecurved surface of a liquid.

a) Arrive an expression for excess pressure inside a liquid drop (2)b) Figure shows the two bubbles of different sizes formed at the end of a tube .When valve is

opened which of the two bubbles grow at the cost of other (1)

14) Degree of hotness of a body is known as temperature. There are different scales for measuringtemperature of a body. Most commonly used scales are Celsius scale and Fahrenheit scale.

a) Write the relation connecting Celsius temperature tC and Fahrenheit temperature tF (1)b) Using above relation express Absolute zero temperature on Fahrenheit scale (1)

15) Water has many unique properties like high specific heat capacity, anomalous expansion etc.

a) Show graphically variation of volume of 1kg. of water when its temperature increases from

0℃ ℃ (1 )

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b) Heating system based on circulation of steam is more efficient in warming a building than

those based on circulation of hot water. Why? ( 1 )

16) Identify and name the thermodynamic processes marked as 1, 2, 3 and 4

(2)

17) Working substance used in Refrigerator is known as refrigerant

a) Give name of commonly used refrigerant (1)

b) A Refrigerator A works between -10℃ and 27℃ while refrigerator B works between -20℃and 17℃, both remove heat equal to 2000J from freezer. Which of the two is better? (2)

OR

a) What do you mean by degree of freedom? (1)

b) Prove that for monatomic gases ratio of specific heats ,γ = (2)

18) Simple harmonic motion may be defined as projection of body executing uniform circularmotion on any diameter of the circle.

a) Plot the reference circle for the S.H.M, x = 3Sin (2πt + π/4), where x is in cm and t is in sec.(Take sense of rotation as anticlock wise) (2)

b) Indicate initial position (t = 0), radius of the circle and angular speed of rotating Particle

(1 )

c) What will happens to the time period of simple pendulum if bob of the pendulum is

completely immersed in water. Explain. (1 )

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19) Velocity of mechanical wave through a medium is determined by elasticity and inertia of

the medium.

a) Velocity of sound is greater in solids than in gases, why? (2)

b) Which assumption were made by Newton for propagation of sound through air (1)

c) Explain why speed of sound through air increases with humidity? (2)

OR

a) Give any two difference between Plane progressive wave and Standing wave (1)

b) S.T in a closed pipe only Odd harmonics are possible (2)

c) Sound produced by Open organ pipe is more shriller than that produced by Closed

Organ pipe. Explain (2)

Prepared ByK.K. RAJEEV, HSST (PHYSICS)

Govt.HSS, ELIMULLUMPLACKALPTA, School Code: 03075

Pin 689 692