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SET D (PHYSICS 11)
1.Answer in brief any six questions.6*2=12
a.Can the sum of two equal vectors be equal to either of the vector ? explain
b.Why does a crickter lower his hand while catching cricket ball?.
c.Explain the significance of the banking of a curved road?
d.Does the centre of mass and centre of gravity lie at the same point ? explain with example.
e.Why are bridges declared unsafe after long use?
f. what do you understand by a second pendulum ? if it's is taken to moon ,will it gain or loss time ? why
g.A ballet dancer stretches her hands when shw wants to come to rest .Why?
2.Answer in brief any two questions.2*2=4
a.water is earthen pot remains cold in summer ? explain
b.Explain the significance differences between first law and second law of thermodynamics.
c.why are dews formed in the clear night but not in the clody ones ? explain.
3.Answer in brief any two questions.2*2=4
a.If a lenses made of glass is immersed in to water .what will happen power.
b.can a convex mirror ever produce a real image .
4.Answer in brief any two questions.2*2=4
a.Can we give any desired charged to a capacitor .
b.Two electric lines of force never intersect each other.why.
5. Answer any three questions
a.A projectile is fired with a velocity and making an angle with horizontal . derive expression for the maximum height ,time of flight and horizontal range .
b.what is variable force ? show that in an elastic collision on between two partilcles the relative velocity of approach before collsion.
c.what is simple pendulum ? show that motion of the bob of a simple pendulum is simple harmonic .obtain an expression for it's time period .
d.what is surface tension and angle of contact .Deduce an expression for rise of liq in a capillary tube.
6.Answer any two questions
a. Define specific latent heat of fusion of solid . develop an expression for determining of the latent heat of fusion of ice.
b. state and explain Stefan law of black body radiation ?
c. Describe the working of diesel engine with the help of pv diagram.
7.Answer any one question.
a.Deacribe an expression connective refractive index of the material prism with minimum deviations .
b.Describe with labelled daigram the working of an astronomical telescope when image is formed at near point .Also calculate it's magnifying power.
8.Answer any one question
a. Difference between dielectric constant and dielectric strength .deduce an expression for the effective resistance of series and parallel combination.
b. Define electric field and potential gradient and relation between them.
9. solve any three questions
a.A stationery mass explodes in to two parts of mass 4 unit and 40 unit respectively .if the larger mass has an kE 10 j.
b.A constant torque of 200N/m turns a wheel about its centre .The moment of inertia about this axis is 1000 kg/m square .find the KE gained after 20 rev.
c.A simple pendulum 4m long swings with an applitude of O.2 m .compute the velocity of the pendulum at its lowest point and it's acceration at extreme ends .
d.Castroir oil at 20 degree Celsius has a coefficient of viscosity 242NSm square and density 940kg/m cube . calculate the terminal velocity of a steel ball of radius falling under the gravity in the oil.
10.Solve any two questions.
a.A glass flask of vol 50O cm cube is just filled with mercury at O degree Celsius.How much mercury over flows when the temperature of the system is raised to 80 degree Celsius ?
b.A rod 1.3m long consists of a o.8m length of Al joined end to end to a O.5 m length of brass .the free end of the Al section is maintained at 150 degree Celsius and the free end of the brass pieces is maintained at 20 degree Celsius.No heat is loss through the side of the rod .At a steady state .what is the temperature at the point .where the two metals are joined ?( ka= 205 and kb= 110).
c.The density of a gas is 1.175kg/m cube at 27 degree Celsius and 10 ^5 N/m square pressure .if the specific heat capacity at constant pressure is 846jkg/k . find the ratio of specific heat capacity at constant pressure to that at constant volume.
11.solve any one question.
a.A glass prism of an angle 72 degree and index of refraction 1.66 is immersed in a liquid of refractive index .find the angle of minimum deviations for parallel beam of light passing through the prism.
b.A convex lens of focal length 24 cm ( refractive index 1.5) is totally immersed in water ( refractive index 1.33). find its focal length in water.
12.solve any one question.
a.Two capacitor of capacitance 4 micro fard and 6 micro fard respectively are joined in serious with a battery of emf 60V . The connection are broken and the like terminal of the capacitor are then joined .find the final charge of each capacitor.
b.Two charges +1*10^-6C and -4*10^-6C are separated by a distance of 2m . Determine the position of the non point .
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