**S.B. Roll No.___________**

**APPLIED PHYSICS-I**

**1**

^{st}Exam/Common/2355/Dec-2011**Duration: 3Hrs. Max. Marks: 75**

**SECTION-A**

**Q1. A) Choose the correct answer**

(i)
The
waves length associated with a particle of mass ‘m’ and moving with velocity V is given by where
‘n’ is Plank’s constant.

(a)
ML

^{2}T (b) ML^{1}T^{-1}
(c)M

^{1}L^{-1}T^{-1 }(d) ML^{2}T^{-1}
(ii)
If then angle between and is

(a) 0 (c)

(b) (d) 5

(iii)
A body is not in transletory equilibrium
when

(a) Resultant
force on it is zero (b) It is
at rest

(b) It
is in accelerated motion (d)
It is in uniform motion.

(iv)
A boat anchor is rocked by waves whose
crests are 100m apart and whose velocity is 25m/s. These waves strike the boat
once every:

(a) 2500sec (c)
0.25sec

(b) 1500sec (d)
4sec

(v)
Hydrogen and nitrogen are at the same
temperature. The modules of which one of them will have more average K.E?

(a) Hydrogen

(b) Both
have equal K.E.

(c) Depends upon actual value of temperature

(d) Nitrogen

**B) State true or false**

(i)
All molecular motion cases at O

^{o}C
(ii)
All materials expand when heated

(iii)
Steel is more elastic than rubber.

(iv)
All parts of rotating wheel have same
angular acceleration.

(v)
A cyclist cannot negotiate a curve
without bending himself.

**C) Fill in the blanks:**

(1) If a light and heavy body have equal K.E, the lighter
body has …… momentum.

(2) If normal reaction is doubled, the co-efficient of
friction is……….

(3) If then is a ……… vector.

(4) W=Mass X……… X……..

(5) When sand is poured on a rotating disc its angular
velocity will……..

**SECTION-B**

Q2. Attempt any six
questions.

(i)
The
frequency of vibration (v) of a stretched string depends upon the load applied
T, length l, and its mass per unit length . Find dimensionally the formula of
frequency.

(ii)
Find
a unit vector that perpendicular to both where and

(iii)
State
and prove Newton’s third law of motion.

(iv)
A
ball is dropped from rest at a height of 12m. If it loses 25% of its K.E. on
striking the ground, what is the height to which it bounces? How do you account
for this loss in K.E?

(v)
What
do you mean by banking of roads? Why is it done? A train has to negotiate a
curve of radius 400m. By how much the outer as compared with the linear for a
speed of 48km/n? Given that the distance between rails is in.

**1**

^{ST}EXAM/COMMON/2355
Q3. Attempt any three
questions.

1. (a)
Distinguish between streamline and turbulent flow.

(b)State and prove- Bermoulli’s theorem.

2.
What are ultrasonic’s? Explain how
these are produced by piczoelectric method. Give two applications of ultra
Sonics?

3.
(a) What are systematic errors?
Explain with example different types of systematic errors. How can each of
these be minimized?

(b)The
young’s modulus (y) of material is given by the relation y=. If the percentage
error in W(=Mg), L, r and l are 0.5%, 1%, 3%, 4% respectively. What is the
percentage error in y.

4.
(a) Distinguish among positive,
negative and zero work done? Give example of each.

(b)Define power obtain expression of
power in terms of force and velocity?

(c)What
should be the power of an engine required to lift 90 tonnes of coat per hour
from a mine whose depth is 200m? (g=9.8m/s

^{2}, 1 tonne=1000kg)
5.
(a) Define the terms torque and
angular momentum. What is the relation between the two?

(b) A man
sitting at the centre of rotating table with his arms out stretched. Angular
speed of table is 40rpm. If the man folds his hands to reduce his moment of
inertia to 2/5 of its initial values, what will be new angular speed?

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