Class - XI
Subject : Physics Time : 3hrs hrs. Marks.
75
1. a) Explain scalar and Vector product with
figures. 6
b) State and explain law of parallelogram
for two vectors acting at a common point. 5
c) A = 4i + j + 3k and B= 2i - j + 2k,
find a unit vector normal to the plane A and B.
or d) Define instantaneous velocity and show
that r = ro + vot + 
a t2, where
the quantities
a t2, where
the quantities
express the
used meaning. 6
e) Establish the relation V = 
r. 5
r. 5
f) What will be the angle of projection
of a projectile, so that its horizontal range becomes
equal to
the maximum height? 4
2. a) Show that the pressure of gas is, P = 
C2. 
6
C2. 6
b) Describe how the relative humidity is
determined with the help of the dry and wet bulb
hygrometer.
5
c) If the pressure of a gas at temperature
O0c
is 3x105 Pa, what is the
pressure at 600c?
4
or d) Describe the construction and working
process of on optical pyrometer. 6
e) State and explain zeroth law of thermodynamics
and hence define temperature? 5
f) A defective thermometer read 40c at liquid ice and at dry vapor 980c
at normal pressure.
What will
be the temperature of the thermometer when it reads 500c? 4
3. a) Distinguish between transverse wave and
longitudinal wave? 5
b) The equation of a particle on
travelling wave is derived as 6
Y
= a sin 
( vt - x).
( vt - x).
c) The frequencies of two tuning forks are
128 and 384 H2. Determine the
ratio of wavelengths
of the
sound produced from them. 4
or, d) Explain standing wave with the help of
mathematical analysis ? 5
e) What is interference of sound? What are
the constructive and destructive interference 6
of sound?
f) The difference in wavelength of sound
wave of frequency in air and water is 4.16 m. If the
velocity of
sound in air is 352 m s -1 then determine the velocity of sound in
water? 4
4. a) What is simple harmonic motion ?
Describe the characteristics of simple harmonic motion. 3
b) Establish a relation between wavelength
wave velocity and frequency. 3
5. Describe the
construction of a mercury thermometer. And working process of it. 6
6. a) Prove that A. (
B + C ) = A . B + A. C 3
b) Determine the angle between the two
vectors, P = 3i + 4j + 2k and
Q
= 2i - 4j + 3k. 3
7. What are the
characteristics of projectile motion? Show that the path of motion of
projectile 6
is
parabolic.
8. What is
angle of static friction and angle of repose? Show that they are equal. 6
9. a) State and explain principle of conservation
of linear momentum. 3
b) A car of mass 750 kg is speeding with a
velocity 80 km. hr -1. Determine the force
applied to
stop the car at a distanced 150 m. 3
or c) What is radius of gyration of a rigid
body? 2
d) Calculate the moment of inertia of a
uniform bar about an axis passing througth the mid
point and
normal at the length of the bar. 4
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