2012 Annual
INTERMEDIATE PART -I   (11th Class)     
(New Pattern)
PHYSICS- I 
2012(A)
Time Allowed: 20:Minutes
Maximum Marks: 17
OBJECTIVE

NOTE: Write answer  to questions on the objective answer sheet provided. For possible answers (A),(B),(C) and (D) to each question are given. You consider correct, fill the circle in front of (A),(B),(C) pr ( D) with pen ink to each question the  answer sheet provided.

• Slope al velocity time graph describe a physical quantity called:

(A) Displacement
(B) Average velocity
(C) Average acceleration
(D) Momentum

• A solar cell converts light energy into:

(A)Heat energy
(B) Chemical energy
(C) Electric energy
(D) Atomic energy

• The apparent weight of a man in a lift moving down with an acceleration of 9.8m/82

(A) Zero
(B) 9.8 N
(C) 19.6 N
(D) Infinite

• The angular displacement of one revolution is equal to:

(A) 1 radian
(B) π/2
(C) π radian
(D) 2π radian

• When a body is falling under the action of gravity with terminal velocity, its acceleration is:

(A) Constant
(B) Zero
(C) Variable 
(D) 9.8 m/s²

• 10 cm extension is produced in a spring due a force of 20N. The spring constant is:

(A) 2Nm^-1
(B) 20Nm^-1
(C) 200Nm^-1
(D) 2000Nm^-1

• If the speed of sound in air at a given pressure is V, then increasing the pressure to double, the new speed becomes:

(A) 0.5V
(B) V
(C) 2V
(D) 4V

• Two waves can interfere only if they have:

(A) Phase Coherence
(B) Same velocity
(C) Difference frequencies
(D) Different wavelength

• A surface on which all the points have same phase of vibration is known as:

(A) Crest
(B) Trough
(C) Wave front
(D) Wavelength

• Optical rotation, a property of optically active substances can be used to determine their:

(A) Density
(B) Viscosity
(c) Concentration in solution
 (D) Elasticity

• The ratio of the size of image to the size of object is called:

(A) Focal length
(B) Visual angle
(C) Resolving power
(D) Magnification

• Boyle's Law is applicable to:

(A) Isobaric Process 
(B) Isochoric Proces
(C) Isothermal process
(D) Adiabetic process

• The efficiency of l diesel Engine ranges from about:

(a) 25% - 30%
(b) 30% - 35%
(c) 35% - 40%
(d) 40% - 45%

• The sum of three numbers 2.7513, 4.10 and 1.273, upto correct decimal place is:
  

(a) 8.12   
(b) 8.13
(c) 8.1273       
(d) 8.127

• Number of colours used in the process of colour printing to produce the entire range  of colours is:
  

(a) Four  
(b) Five
(c) six     
(d) Seven

• Mathematically unit vector is given by:
  

(a) Â=A
(b) Â=A/
(c) Â=/A
(d) Â=.

• Torque of a force is given by r= ṝx It has maximum Value when  and are at an angle of:

(A) 90°
(B) 0°
(C) 30°
(D) 60°

INTERMEDIATE PART-1
(11th Class)
PHYSICS PAPER-I
2012A 
Time allowed:2.40 Hours
Maximum Mark: 68
Subjective

NOTE: Write short answers to any twenty two questions of Section-I and attempt any three questions from Section-II. Write same question number and its part number in answers book, as given in the question paper.

Section-I
22x2=44

Q.No.2: Attempt any eight parts.

• Difference between Base Units and Derived Units.
• Shows that the famous “Einstein Equation” E= me2 is dimensionally consistent.
• How many years are there in 1 second?
• What are rectangular component of a vector? At what angle there components are equal?
• Write any two characteristics of cross product.
• Can you add zero to a null vector?
• State First and Second laws of  motion.
• Derive expression for the range of projectile.
• Show that the force is the rate of change of linear momentum.
• Calculate the work done in Kilo Joules in lifting a mass of 10kg (at a steady velocity) through vertical height of 10m.
• A boy uses a catapult to throw a stone which accidentally shames a green house window. List the possible energy changes.
• What sort of Energy is stored in:
  (a) Compressed spring (b) Water in a high darn.

Q.No.3:

• Explain what is meant by Centripetal force. How is it converted of angular velocity?
• Derive the relation between linear and angular velocity.
• A disc and hoop start moving down from the top of an inclined plane at the same time. Which one will reach faster at the bottom?
• Explain what do you understand by the term viscosity.
• Why fog droplets appear to be suspended in air?
• Briefly explain “Viscous Drag”.
• Name two characteristics of simple harmonic motion.
• Does frequency depend on amplitude for harmonic oscillators?
• Describe some common phenomena in which resonance plays an important.
• Explain why sound travel faster in warm air than in cold air?
• How are beats useful in tuning musical instruments?
• What is Progressive Wave? Give the name of two kinds of Progressive Waves.

Q.No.4 : Attempt any six parts.

• Under what condition two or more sources of light behave as coherent sources?
• Can visible light produce interference fringes? Explain.
• How would you manage to get more order of spectra using diffraction grating?
• What do you understand by linear magnification and angular magnification?
• Why would it be advantageous to use blue light with a compound microscope?
• How the light signal is transmitted through the optical fiber?
• Give two examples of adiabatic processes.
• Why does the pressure of a gas in a car tyre increase when it is driven through some distance?
• Is it possible to construct a heat engine that will not expel into the atmosphere?

Section-II

NOTE:  Attempt any three question.

Q.5 (a) Define Linear Momentum with unit. Also state prove law of conservation of linear Momentum. 5
(b) Find the projection of vector Â= 2ȋ-8ĵ+Ќ in the direction of the vector B=3ȋ+4ĵ+12Ќ.  3

Q.6 (a) Write difference between real and apparent weight. Explain how real and apparent weight are different in a lift moving with some acceleration. 5
(b) How large a force is required to accelerate an electron (m =9.1 x 10³¹Kg) from rest to a speed of 2 x 10⁷ m^-1through a distance of 5.0 cm?  3

Q.7(a) Define Molar specific Heat. Show that Cp-Cv=R. 5
(b) What guage pressure is required in the city mains for a stream from a Fire House connected to the mains to reach a vertical height of 15m.  3

Q.8(a) Explain energy conservation in S.H.M. 5
(b) Find the temperature at which the velocity of sound in air is two times its velocity at 10°C.  3

Q.9(a) Describe the Young’s Double slit experiment for demonstration of interference of light. Also derive an equation for fringes spacing or width.  5
(b) An astronomical telescope having magnifying power of two thin lenses 24 cm. apart. Find focal length of Lenses.  3