PHYSICS, GROUP FIRST
TIME: 20 MINUTES
MARKS: 17
OBJECTIVE

NOTE: You have four choices for each objective type question as A, B, C and D the choices which You think (is correct, fill that circle in front or that question number. Use marker or per to fill the circles, Cutting or filling two or more: circles will result in zero mark in that question, Attempt as many questions as given in objector type question paper and leave others blank, Write the letter. A B C or D in the column (Write correct option) against each question If the is contradiction in the bubble and hand write answer bubble option will be considered correct

QUESTION NO I

• The number of basic physical quantity in the SI system is:
  

(A) Four         
(B) Five                
(C) Six                  
(D) Seven

• One fern to equals 
  

(A) 10^-15            
(B) 10^-12               
(C) 10^-12                 
(D) 10^-15   

• The dot product of a vector A i:
  

(A) 0                
(B) 1                      
(C) A                     
(D) A²

• The time of flight of a projectile is
  

(A) Vi sin ɵ        
(B) 2 Vi Sin ɵ  
(C) Vi Sin ɵ            
(D) 2 Vi Sin ɵ

• The result of adding A into - A i:
  

(A) 0    
(B) 1                   
(C) A                     
(D) A2

• 1 KWH equals
  

(A) 0.36 MJ           
(B) 3.6 MJ       
(C) 36 MJ          
(D) 360 MJ

• π Radian equal 
  

(A) 60°                          
(B) 90°                  
(C) 80°                  
(D) 360°

• Moment of inertia is equal to
  

(A) m²r
(B) m²r²             
(C) mr                  
(D) mr²

• The frictional effect between different layers of a. moving fluid is called
  

(A) Fluidity                   
(B) Density     
(C) Viscosity          
(D) Flow rate

• If the time period of simple pendulum is 2 seconds its frequency will be
  

(A) 1.0 Hz       
(B) 0.5 Hz      
(C) 15 Hz       
(D) 2 Hz

• Velocity of sound in free space at 0-1 C:
  

(A) 332 ms^-1 
(B) 224 ms^-1
(C) 76 ms^-1
(D) 0

• The number of anti node between tyro nodes is
  

(A) 1                
(B) 2                      
(C) 3                      
(D) 4

• The Michelson interferometer is used to find:
  

(A) The refractive index of glass         .
(B) The thickness of glass plate
(C) The distance with very high precision          
(D) Optical rotation

• Brilliant and beautiful colors in soap bubbles are due to

(A) Diffraction of light
(B) Polarization of light
(C) interference flight
(D) Reflection of light

• The least distance of distant vision
  

(A) 5 C.m                        
(B) 10 C.m                          
(C) 25 C.m                          
(D) 50 C.m

• For an adiabatic process First law of thermodynamics becomes
  

(A) Q = ∆U+W        
(B) Q = ∆U              
(C) Q = W            
(D) ∆U = - w

• The difference between Cp and a is equal to
  

(A) Avogadro's constant
(B) Plank’s constant
(C) Universal gas constant
(D) Boltzmann constant

15(obj)-1 2012-60000
SEQUENCE —1
PHYSICS, GROUP FIRST
116 CLASS - 12012)   
2.40 HOURS
SUBJECTIVE
MARKS :68
SECTION-1

 QUESTION NO:2 Write short answers any Eight (8) questions of the following

• Why do we find it useful to have two units for amount of substance, the kilogram and The mole?
• Define random and systematic error
• Density of air is 1.2 Kg/m³ change it into gm/Cm³
• If A + B = 0 what can you say about the components of the two vectors
• Under what circumstances would a vector have components that are equal in magnitude?
• Prove that A. B = Ax Bx + Ay By + Az Bz
• At what point or points in its path does a projectile have its minimum speed, Its maximum speed.
• Motion with a constant velocity is a special case of motion with a constant acceleration,Is this statement true, Discuss
• An atheolete wishes to generate a long jump. At what angle he should jump
• Prove that 1 K.W.H 3.6 MJ
• What are the essential conditions for conservative field
• Calculate the work done in Kilo-Joules in lifting a mass of 10 Kg through a vertical
  distance (Height) of 10 m
  

QUESTION No. 3 Write short answers any Eight (8) questions of the following 16

• Describe what should be the minimum velocity, for a satellite, to orbit close to the Earth around it.
•  Why does a diver changes his body positions before and after diving in the pool? 
• How many minimum number of geo-stationary satellites are required for global coverage of T,V transmission
• Explain what do you understand the term viscosity?
• Why fog droplets appear to be suspended in air?
• How an aeroplane is lifted up ?
• Can we realize an ideal simple pendulum?
• Does frequency depands on amplitude for harmonic oscillator
• Show that in S.H.M the acceleration is zero when velocity is greatest and the velocity is zero when acceleration is greatest
• What features do longitudinal waves have in common with transverse waves?
• How beats are useful in tuning musical instruments
• Explain why sound travels faster in warm air than cold air?
  

 QUESTION NO. 4 Write short answers any Six (6) questions of the following: 12

• State Huygen’s principle which enable us to determine the shape and location of new wave fronts  
• Under what conditions two or more sources of light behave as coherent sources?
• How would you manage to get more orders of spectra using a diffraction grating?
• Explain how a convex tens is used as a magnifier?
• Why would it be advantageous to use blue light with a compound microscope?
• What is spectra meter? Write the name of its parts
• State any two postulates of kinetic theory of gases
• Why is the average velocity, of the molecules in a gas zero but the average of the square of velocities is not zero?
  

SECTION-11

Note: Attempt any THREE questions from this section : 8x3-24  

5. (a) What is a projectile. Derive relations for    
(i) Time of flight     (ii) Range of the projectile              1+2+2
(b) The magnitude of dot and cross product of two vectors are   and 6 respeovely. Find the angle between the vectors         3

6. (a) Define rotationaI K.E. Also derive formula for rotational K.E. of a disc and a hoop coming down an inclined plan. 5
(b)  How large a force is required to accelerate an electron (m = 9.1 x 10^-13 Kg) from rest to a Speed of 2.0 x 10⁷mS^-1 through a distance of 5.0 Cm ?      3

7.(a)    State Bernoulli's Equation. Derive its mathematical form
(b) A heat engine performs 100J of work and at the same time rejects 400J of heat energy to the cold reservoirs, What is the efficiency of the engine? 3

8. (a) what is Doppler's Effect. Derive mathematical formula for apparent frequencies in any two different possible case    5
(b) A block of mass 4.0 k.g is dropped from a height of 0.8(.1 in on to a spring of spring constant K = 1960 Nm^-1 Find the maximum distance through which the spring will be compressed . 3

9. (a)   Define magnification, Describe the construction and working of a compound microscope. Derive expression for its magnification
(b) Sodium light (λ= 589 nm) is incident normally on a grating having 3000 lines per centimeter. What is the highest order of the spectrum obtained with the grating?