"OM Sai Ram"
"Er.Shyam Pachori Science Classes"
PHYSICS(Theory)
CLASS:XI
Time:1:30
Min
M.M :50
General
Instruction:
1. All questions
are compulsory.
2. There are 30
questions in total. Question 1 and 4 carry 1 marks each. Question 5 to 9 carry
2 marks each. Question 10 to 16 carry 3 marks each and question 17 to 19 carry
5 marks each.
3.There is no
overall choice in paper , however some internal choices are mentioned in the
paper.
Q1.Why is
gravitational potential energy always negative?
Q2.Why there are
two propellers in helicopters?
Q3.Why do we prefer
a wrench of longer arm?
Q4. When air is
blown between two balls suspended closed to each other. They are attracted towards each other. Why?
Q5. Which is more
elastic rubber or steel? Explain
Q6. Explain the
principle of working of hydraulic brakes with its diagram.
Q7..Explain why hollow shaft is Stronger than solid
shaft.
Q8. Define angle of
contact for adhesive and cohesive forces of a liquid.
Q9.
Derive the expression for elastic potential energy of a stretched wire .
Q10. Eight rain drops of radius 1mm. each falling down with the
terminal velocity of 5 cm/s combine to form a bigger drop. Find the terminal
velocity of bigger drop.
Q11.
Obtain on expression showing variation of
acceleration due to gravity with
height? How far away
from the surface of earth does the value of g is reduced to 4% of
its value on the surface of the earth Given radius of earth =
6400km.
Q12.
Derive the expression for excess pressure inside a soap bubble.
Q13. Deduce the law
of gravitation from kepler’s law of planetary motion.
Q.14.
Calculate the work done in splitting a drop of water of radius 1 cm to 106
droplets. Given surface Tension of water = 0.072 N/m
Q15. Define three coefficients of expansion α, β and γ and derive relation between them..
Q16. Padma‘s
little sister was crying. Then she took a piece of camphor and put it in water.
By seeing the camphor piece dancing on the surface of water, the little one
stopped crying.(a) What can you say about the qualities of Padma?
(b)Why
do small pieces of camphor dance on the surface of water? (Value based question)
Q17. State and
prove Bernoulli’s theorem with its one application.
Q18.State and prove
theorm of parallel axis.
OR
Derive the expression for Torque in terms of the Cartesian coordinate system.
Q19. Moon does not
have atmosphere ,Why? Obtained an
expression for escape velocity of the body from the surface of earth , does it
depends upon mass of satellite ?
OR
Derive the expression for
height of a liquid in a capillary tube of insufficient length.
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