Physics
1st Year Important Questions
Short Questions
1.
What is difference between precision and accuracy?
2.
What is the dimension? Write the uses of dimension.
3.
What is the principle of homogeneity?
4.
Does a dimensional analysis give any information on constant of proportionality that may appear in an algebraic
expression? Explain?
5.
Write the dimensions of (i) Pressure (ii) Density?
6.
Three students measured the length of a needle with a scale on which minimum division is 1mm and recorded as (i)
0.2145m (ii) 0.21m (iii) 0.214m which record is correct and why?
7.
Add the following masses given in kg upto appropriate precision.2.189, 0.089, 11.8 and 5.32?
8.
What are the dimensions and units of gravitational constant G in the formula
F
G m1 m2 𝑟2
9.
Show that the famous “Einstein equation” E = mc
2
is dimensionally consistent.
10.
Show that the expression
V
f
Vi
at
is dimensionally correct, where
V
i
is the velocity at t =0, a is
acceleration and
V
f
is the velocity at time t.
F l
11.
Check the correctness of the relation
v
where v is the speed of transverse wave on a stretched
m
string of tension F, length l and mass m.
12.
Find the dimensions and hence, the SI units of coefficient of viscosity
in the relation of Stokes’ law for the
drag force F for a spherical object of radius r moving with velocity v given as F 6 r v ?
13.
Prove that vector addition is commutative.
14.
Prove that scalar product is commutative.
15.
Write four steps for vector addition of rectangular components.
16.
How vector addition by rectangular components is reverse process of vector addition.
17.
Define the terms (i) unit vector (ii) Position vector and (iii) Components of a vector?
18.
The vector sum of three vectors gives a zero resultant. What can be the orientation of the vectors?
19.
Is it possible to add a vector quantity to a scalar quantity? Explain.
20.
Can you add zero to a null vector?
21.
Show that the sum and difference of two perpendicular vectors of equal lengths are also perpendicular and of the same
length?
22.
How the two vectors of the same magnitude would have to be oriented, were to be combined to give a resultant equal to
a vector of the same magnitude?
23.
If
all
the
components
of
the
vectors
A
1
and
A
2
were reversed, how would this alter A1 A2 ?
24.
What is the unit vector in the direction of the vector A 4iˆ 3 ˆj .
25.
Can moving objects have impulse? Explain.
26.
What is elastic collision and inelastic collision?
27.
Calculate the formula for force due to water flow.
28.
What is fuel in jet engine?
29.
What is ballistic missile and ballistic trajectory of projectile?
30.
Define impulse and show that how it is related to linear momentum.
31.
At what point or points in its path does a projectile have its minimum speed, itsmaximum speed?
Find the angle of projection of a projectile for which its maximum height and horizontal range are equal.
32.
What is work? Define one joule work?
33.
What is variable force? Give one example.
34.
What is power, instantaneous power? Also define one watt.
35.
Prove
that
P=
F
.
v
