Students’ First Academy
(For Boys &
Girls)
schedule test: 1st half book
Name: _____________ Class: 1st
year
Subject: physics Total
Marks: 85
Q No: 1
OBJECTIVE /17
(i) Light year is the unit of: a) Light b)Time c)Velocity d) Distance
(ii)Rectangular components have angle
between them:
a) 30 b) 45 c) 60 d)
90
(iii)Cross product of j x k is: a) 0 b) 1 c) i d) –i
(iv)Scalar product of force and velocity
is: a) Work b) Power c)
Energy d) Acceleration
(v)Rate of change of momentum is equal to:
a) Impulse
b) Torque c)
Velocity d) Force
(vi) The dimension of 
is same as that
of: a)Time b) Energy c)Velocity d)Force
vii)The ratio of
velocity of disc to velocity of hoop is:
a) 
b)
c)
d)
viii)In angular motion the centripetal
force Fc is :
a)m2rw b) mr2w c)mrw2 d) mr2w2
ix)One revolution is equal to: a) π rad
b) 2Ï€ rad
c) π/2 rad d)
Ï€/4rad
x)The area under the velocity time graph
gives: a) Force b)
Acceleration c)Distance d) Torque
xi)An example of derived unit is : a) Candela b) Ampere c) coulomb d) Mole
xii)Joule is the unit of : a) K.E b) P.E c) Heat Energy d) All
xiii)Which one is the vector quantity: a) speed
b) volume c) distance
d) velocity
xiv)Nm =….. : a) kgm2s-2 b) kgm2s-1 c)kgm-2s2 d)none
xv)
73.65 can be rounded of as: a) 73.6
b) 73.7 c)
73.65 d)none
xvi)Projectile motion is: a) one dimensional b) two dimensional c)
three dimensional d)none
xvii)If ÆŸ=90,then work done is: a)
zero b)
positive c)
negative d) none
SUBJECTIVE
Ø Q NO.2 ( ATTEMPT ANY 8) 8x2=16
I) Define radian and steradian.
II) Differentiate b/w random error and systematic error.
III) Check the correctness of the relation. v = 
IV) Write the dimension of: a) Pressure b) Density
V) Give the drawback to use the period of a pendulum as
a time standard.
VI) How many seconds are there in one year?
VII) Define range of projectile.
VIII) Can the velocity of an object reverse the direction
when acceleration is constant? If so, give an example.
IX) Define impulse and show that how it is related to
linear momentum?
X) At what point or points in its path does a projectile
have its minimum speed, its maximum speed?
XI) Differentiate b/w elastic and inelastic collision.
XII) What is relation b\/w force and time rate of change
of momentum?
Ø Q No: 3 (ATTEMPT ANY 8) 8x2=16
I) Define Position Vector.
II) Define rectangular coordinate.
III) Write any three properties of cross products.
IV) Two vectors have unequal magnitudes. Can there sum be
zero? Explain.
V) Can the magnitude of a vector have a negative value?
VI) The vector sum of three vectors gives a zero
resultant. What can be the orientation of the vectors?
VII) Define work done by constant force.
VIII) Define work-energy principle.
IX) Define escape velocity.
X) A girl drop a cup from a certain height, which breaks
into pieces. What energy changes are involved?
XI) When a rocket
re-enters the atmosphere, its nose cone becomes very hot. Where does this heat
energy comes from?
XII) An object has one joule potential energy. Explain
what does it mean?
Ø Q No: 4 (ATTEMPT
ANY 6) 6x2=12
I) Prove that 1 rad = 57.3°.
II) What is the relation b/w angular and linear velocity?
III) Define law of conservation of angular momentum.
IV) What is the difference b/w real and apparent weight?
V) What is meant by moment of inertia? Explain its
significance.
VI) Show that orbital angular momentum L0 =
mvr
VII) Why does a
diver change his body positions before and after diving in the pool?
VIII) When mud flies off the tyre of moving bicycle, in
what direction does it fly? Explain.
IX) Describe that should be the minimum velocity, for a
satellite, to orbit close to the earth around it?
LONG QUESTIONS
5) a) Explain Vector addition by rectangular components.
/4
b) A car of mass 800kg travelling at 54kmh-1
is brought to rest in 60m. Find the average retarding force on the car. What
has happened to original kinetic energy? /4
6) a) Prove that:
Fc = 
/4
b) A football is thrown
upward with an angle of 30° with respect to horizontal. To throw a 40m pass.
What must be the initial speed of the ball? /4
7) a) Explain
inter-conversion of potential energy and kinetic energy. /4
b) Given that A= i-2j+3k and B= 3i-4k,
find the projection of A on B. /4
8) a) Explain elastic collision in one dimension and any
two cases. /4
b) A 1000kg car travelling with the speed of 144kmh-1 round a
curve of radius 100m. find the necessary centripetal force. /4
9) a) What is the orbital radius measure from the centre of
the earth, for a geostationary satellite?
/4
b) A diver weighing 750N dies from a boat 10m above the
surface of a pool of water. Use the conservation of mechanical energy to find
his speed at a point 5m above the water surface, neglecting air frictions. /4
I was Born to Rise