Enrollment No: _______________________	     Exam Seat No:_______________________
C.U.SHAH UNIVERSITY
Winter Examination-2015

Subject Name :  Physics-I  

Subject Code :4SC01PHC1                                            Branch :B.Sc (All)
			
Semester :1       Date :07/12/2015     Time :10:30 To 1:30           Marks :70
Instructions:
(1)	Use of Programmable calculator & any other electronic instrument is prohibited.
(2)	Instructions written on main answer book are strictly to be obeyed.
(3)	Draw neat diagrams and figures (if necessary) at right places.
Assume suitable data if needed.		 		 
Q-1		Attempt the following questions:	(14) 	
	a)		Write down the formula of Newton's law of Universal Gravitation.		
	b)		Give the value of Gravitational constant (G) with its unit.		
	c)		Give the full form of PRT.		
	d)		What is specific heat?		
	e)		How many types of waves are there? Which?		
	f)		Give the range of Audible waves.		
	g)		Give the statement of Newton's third low of motion.		
	h)		What is elastic collision?		
	i)		State the definition and unit of stress.		
	j)		On which factor does the co-efficient of elasticity/modulus of elasticity depend?		
	k)		Define: Torque		
	l)		What are the units of emf and self inductance?		
	m)		Give the statement of Thevenin's theorem.		
	n)		What is multimeter? Give its application.		

Attempt any four questions from Q-2 to Q-8
	
Q-2		Attempt all questions		
	1	Explain Compound pendulum with neat and clean diagram. Also derive formulla for the same.	7	
	2	Explain with diagram about the gravitational potential self energy/potential energy of a planet or uniform sphere.	7	
Q-3		Attempt all questions		
	1	What is Pyrometer? Give their types. Explain Fery's total radiation pyrometer.	7	
	2	Explain construction and working of platinum resistor thermometer with its merits and demerits.

	7	
Q-4		Attempt all questions		
	1	State the differences between the transverse and longitudinal waves.
	5	
	2	Give the statement of Work-energy theorem. Derive its formulla.	5	
	3	Write down the applications of the ultrasonic waves.	4	
Q-5		Attempt all questions		
	1	Explain any one method of production of ultrasonic waves.	7	
	2	Explain the types of collision.	7	
Q-6		Attempt all questions		
	1	Calculate the self energy of the earth by using the following detail.
Gravitational constanat = 6.6×10-11Nm2/Kg2
radius of the earth = 6.37×106m
mass of the earth = 5.98×1024Kg.	5	
	2	A load of 2 gm produces an extension of 1 mm in a wire of 3 meters in length and 1 mm in diameter. Calculate Young modulus of the wire, giving its unit.	5	
	3	Two particles of mass 1kg and 3 kg have position vector 2i+3j and -2i+3j-4k. Find the center  of mass.	4	
Q-7		Attempt all questions		
	1	Describe the formulla of relation between angular momentum and torque.	5	
	2	Explain the theorem of parallal axis for moment of inertia with necessary diagram.	5	
	3	Explain about the Bulk modulus.	4	
Q-8		Attempt all questions		
	1	Explain with necessary circuit diagram and formulla about the growth of current in L-R circuit with dc source.	7	
	2	Explain maximum power transfer theorem with necessary diagram and state its applications too.	7