Class
11 Physics
Important
Questions for Finals.
Q1.Why
is gravitational potential energy always negative?
Q2.Why
mercury does not wet glass?
Q.3
Can a body have energy without momentum ?explain.
Q.4
What is the angle of friction between two surfaces in contact , if coefficient
of friction is 1/√3.
Q.5
Equal masses of two substances of densities
p1 and p2 are mixed together .What is the density
of the mixture.
Q6.A
light body and a heavy body have same momentum , which one has greater KE?
Q.7
A uniform chain of length L and mass M is lying on a smooth table and one third
of its length is hanging vertically down over the edge of the table. If g is
acceleration due to gravity .calculate work required to pull the hanging part
on the table.
Q.8
Find the angle through which a cyclist bends when he covers a circular path
34.3m long in √22 sec .Given g=9.8 m/s2.
Q.9 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
Q.10 If the Kinetic Energy of a body
increases by 300%, by what % will the linear momentum of the body increase?
Q.11 A satellite is revolving is
a circular path close to a planet of density P. find an
expression
for its period of revolution?
Q.12
Which is more elastic rubber or steel? Explain.
Q.13
Explain Magnus Effect with its diagram.
Q.14
State and prove work energy theorem.
Q.15
Explain the principle of working of hydraulic brakes with its diagram.
Q.16
Derive the expression for the rise of liquid in a capillary tube ?
Q.17
Moon does not have atmosphere ,Why? Derive the relation for Escape velocity of
a planet, does it depend upon the mass of satellite.
Q.18.
Derive the expression for elastic potential energy in a stretched wire?
Q.19. 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.
Q.20. Describe the variation of
acceleration due to gravity (g) with depth and draw a graph showing the
variation of g as one moves outwards from the centre of earth.
Q.21.What
is banking of tracks? Find an Expression for the velocity of a car moving along
a banked track. what is optimum velocity?
Q.22
Derive expression for Bernoulli’s theorem?
Q.23Derive the expression for the velocities
of objects in elastic collision in one dimension.
Q.24 Write the number of significant figures in (a) 2.64 × 1024
kg (b) 0.00786 g/cm3
Q.25 Can two streamline cross each other in flowing liquid ?
Explain.
Q.26 In which motion
linear momentum changes but K.E does not?
Q.27What is the time period of simple pendulum at the centre
of the earth?
Q.28 What is the S.I unit and dimensional formula for plancks
constant?
Q.29 Why is difficult to stop bleeding from cut in human body
at high altitudes?
Q.30 When air is blown between two balls suspended closed to
each other. They are attracted towards each other. Why?
Q.31 What will be the effect on the duration of a day on
earth, if the earth suddenly contracts?
Q.32 If the radius of
the earth shrinks by 5%, mass remaining same , then how would the value of
acceleration due to gravity change?
Q.33 Show that impulse of a force is equal to change in linear
momentum produced by the force.
Q.34 why is it easier
to pull than to push a body ?
Q.35 Write the
dimension of aXb in the relation.
F=ax + bt2, where F is
force, x is distance and t is time.
Q.36. A particle is projected with velocity u making an angle
with the horizontal direction. Write formula for:
(a) Time of Flight
(b) Horizontal Range
Q37. At what angle the
horizontal range and the height for a projectile is equal ?
Q.38 Explain Hooke’s law with
stress strain curve.
Q.39 Explain First law of thermodynamics with its
equation.
Q.40 Explain why hollow
shaft is Stronger than solid shaft.
Q.41 A machine has a mass of 20kg. It fires 35gm bullets at
the rate of 4 bullets per second , with the speed of 400 m sec-1.what
force must be applied to the gun to keep it in position ?
Q.42. Define Cp and Cv and Derive the
relation between them..
Q.43. Derive the equation by calculus method
S =
ut + ½ at2
Where symbol has their usual meanings
Q.44
State and prove theorm of parallel axis.
Q.45.Prove
by calculus method , that the change in kinetic energy is equal to workdone.
Q.46 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.
Q.47 What do you mean by bending of cyclist and derive the
expression for the angle of bending.
Q.48.Show the motion of a liquid in a U-tube is simple
harmonic, find an expression for its time period.
Q.49 Find the scalar product
between vectors A=3i - 2j + 4k and B = 2i - 4j + 3k.
Q.50. Write the formula for Kinetic energy, Potential energy
and total energy of a body executing SHM. Prove that energy that energy is
directly proportional to square of amplitude and frequency.
Q.51.Define three coefficients of expansion α, β and γ and derive relation between them..
Q.52 Explain the construction and various operations for an
ideal carnot heat engine working between two temperatures and define its efficiency .
Q.53How much heat
energy is required to heat 1 kg of water at 20 ⁰C to 100 ⁰C?
Q.54.A water pipe entering a holes has a diameter of 2 cm and
the speed of water is 0.1 m/s. Eventually, the pipe tappers the diameter of
1cm.Calculate the speed of water in the trap portion.
Q.55.(a)State and prove parallelogram law of vectors addition.b)The x – t graph for two bodies in
motion is as shown. Which body has more velocity.
Q.56.Derive
the expression for torque in terms of
the Cartesian coordinate system.
Q.57.State Newton’s second law of motion on its basis derived
the relation between force and acceleration.
Q.58.explain
keplers law of planetary motion.
Q.59
Two bodies A and B having masses 5 kg and 6 kg respectively, have there equal
momentum. Find ratio of their Kinetic
energies.
Q.60
Air is pushed into a soap bubble of radius r to double its radius , if the
surface tension of the soap solution is S ,find the workdone.
Q.61
The resistance R=V/I, where V =100 ± 5 V and I =10 ± 0.2 A.Find the % error in
R.
Q.62 Suraj went to Big
Bazaar to purchase certain goods .There he has noticed an old lady struggling
with her shopping. Immediately he showed her the lift and explained to her how
it carries the load from one floor to the next. Even then the Old lady was not
convinced.. Then suraj took her in the lift and showed her how to operate it..
That old lady was very happy. (a)What values does Suraj possess? (b)An elevator
can carry a maximum load of 1800 kg is moving up with a constant speed of 2 m/s
, The frictional force opposing the motion is 4000 N. Determine the minimum
power delivered by the motor to the elevator in watts as well as in horse
power.(Value Based Question)
Q.63
Rakesh
with the intention to win in the interschool sports practiced high jump every
day for about a month. He participated and won I position in the interschool
sports. (a) Comment upon the values Rakesh possesses. (b) Why does an athlete
run some steps before taking a jump?
(Value Based Question)
Q.64 Newton’s
Second law of motion is the real law of
motion , Explain.
Q.65 Draw a graph showing static , limiting and kinetic
friction ?
Q.66 . Having seen
a big stone falling from the top of a tower Ravi pulled his friend Kiran away.
The stone hit Ravi slightly and he got hurt. But he was saved from a major
accident. (a)What made Ravi act in such a way. (b)From the top of a tower 100 m
in height, a ball is dropped and at the same time another ball is projected
vertically upwards from the ground with a velocity of 25 m/s.Find when and
where the two balls meet. Take g = 9.8 m/sec2.(Value Based Question)
Q.67 A monkey is sitting on a tree. Rahim seeing the Monkey
brought some fruits
and gave them to the Monkey, and ran into the house
immediately. On hearing the
sound produced when Rahim was running the monkey was scared
and climbed the
nearby tree. (a) What values of Rahim inspired you?
(b)A monkey of mass 40 Kg climbs on a rope which can stand a
maximum tension of 600 N .
In which of the following cases will the rope will break. The
monkey
(I) Climbs up with an acceleration of 6 m/s2
(II) Climbs down with an acceleration of 4 m/s2
(III) Climbs up with a uniform speed of 5 m/s
(IV) Falls down the rope nearly under gravity?
(Take g= 10 m/s2) (Ignore the mass of the rope) (Value Based Question)
Q.68 A sports
teacher was training the children for march-past. On their way they
come across a bridge .Then the physical education teacher
stopped the children from
marching on the bridge.
(a) Comment upon the
values of sports teacher.
b) Also explain what is meant by Resonance.
Q.69 (a)Ravi has to attend to an interview . He was not well.
He took the help of his friend Raghavan. On the way office Ravi felt giddy, He
vomited on his dress. Raghavan washed his shirt. He made Ravi to drink enough
amount of water. In spite of doing ,a foul smell was coming from the shirt.
Then Raghavan purchased a scent bottle from the nearby cosmetics shop and
applied on Ravi. Ravi attended the interview, Performed well .Finally he was
selected.
(a)What values do you find in Raghavan?
(b)The velocity of air molecules is nearly 500m/s. But the
smell of scent spreads very slowly, Why? (Value
Based Question)
Q.70 Ratan noticed that his grandfather to be suffering from
fever. He took him to the doctor The
doctor gave him some pills .When the pills were used he
sweated much, after some time became
normal.Rahim enquired the Doctor about how his grandfather
became normal .
(a)According to you what values are possessed by Ratan?
(b) A child running a temperature of 101°Fis given an
Antipyria which causes an increase in the rate of evaporation of the body. If
the fever is brought down to 98°F in 20 mts, what is the amount of heat lost by
the body? . The mass of the child is 30 kg.
(Value Based Question)
Q.71 (a) Savita was surprised to see oil spreading on to the
surface of water and asked her mother to explain why oil spreads on to the
surface of water. Her mother explained her daughter the reason behind it. By
going through the explanation she thought of learning more about the other
scientific phenomenon also. What qualities do you can find in Savita?
(b) Oil spreads over the surface of water whereas water does
not spread over the surface of oil. Why?
(Value Based Question)
Q.72(a) A small hair piece has fallen into the eye of Suresh.
It caused itching sensation in the eye of Suresh seeing that Hari, who is a
friend of Suresh, took him to the eye specialist. The Doctor removed it. Suresh
expressed his gratitude to Hari.Comment upon the values of Hari.
(b) A student measure the thickness of a human hair by looking
at it through a microscope of
magnification 100.He makes 20 observations and finds that the
average width of the hair in the field of view of the microscope is 3.5mm. What
is the estimate on the thickness of hair?
Q.73 Vineet saw his uncle planting seeds in the land. His
uncle does not know methods of growing plants. Then he decided to make his
uncle aware of this. He explained the importance of ploughing the land before
planting the seeds. Uncle is convinced with his ideas. He planted accordingly.
The plants grown successfully.
(a) What can you say about Vineet?
(b) What is the utility of ploughing a field? Does it help the
soil to retain moisture
(Value Based Question)
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