(guess)
- State sabine’s formula and write the expression for reverberation time for it?
- 2. Define critical angle and mention its relation with refractive indeed?
- Mention the uses of deflection magnetometer?
- Write down the units for
a) Charge b) Permittivity c) Potential d) electric Field Strength
5. When is series combination of cells advantageous and why?
6. What are seebeck effect and Peltier effect?
7. What is transformer ratio?
8. What are de Broglie waves?
9. Define the terms “Mass defect “and “Binding” energy”
10. What is Zener diode? How will a Zener diode be conducted in circuits generally.
11. What are beats? How are they produce? Explain with an example.
12. What is polarization of light? Explain how plane polarized light is obtained by reflection.
13. Derive the equation for the couple acting on a bar magnet placed in a uniform magnetic field making an angle ‘θ’ with the direction of field.
14. Derive the equivalent capacitance when a number of capacitors are connected in parallel.
15. Explain wheatstone bridge principle.
16. State and explain Biot savart’s law.
17. What is nuclear fusion? Explain the carbon-nitrogen cycle.
18. What is rectification? Explain the working of a half wave rectifier.
19. Describe Young’s double slit experiment and give the necessary theory to explain formation of dark & bright interference pattern.
20. (i) Describe the construction & working of a moving coil galvanometer. Derive an expression showing the relation between electric current and deflection of coil.
(ii) A coil in MCG has an area 4 cm2 and 500 turns. The intensity of magnetic induction is 2 T. When a current of 10-4 A is passed through it, the deflection is 20o. Find the couple per unit twist.
21. (i) Describe J.J. Thomson’s experiment to measure e/m of an electron.
(ii) The voltage across the electrodes of a cathode ray tube is 500 v. Calculate the speed of electrons.
INTER 2ND YEAR MAY 2007 PHYSICS
Note:
Answer all of the followingEach Qn carries 2 marks
All are very short answer type questions
Answer in one or two sentences only and in one place in proper order.
- What do u mean by reverberation time of an auditorium?
- the angle of deviation for violet and red colors of a crown prism are 5.23oo respectively. Find the dispersive power of the prism. and 5.15
- Mention any two applications of diffraction phenomenon of light
- Why magnet’s poles are reversed at a given position on deflection magnetometer totake readings?
- What is specific resistance of the material of a conductor? Mention its uses?
- What is specific resistance of the material of a conductor? Mention its units?
- How a table galvanometer is converted into an ammeter and a voltmeter?
- What is Moseley’s law? Give one significant aspect of the law?
- Mention any two uses of radio isotopes?
- 10. What are the important regions of a transistor and what are their main functions?
SECTION – B
Note:
Answer any SIX questions
Each question carries FOUR marks
All are short answer type questions
Limit your answer to 75 words only
11 A motor car approaching a cliff with velocity 108 kmph sounds horn and the echo
is heard after 0.3 sec. Assuming the velocity of sound in air to be 332 m/s. lculate the distance between the car and the cliff when the horn is blow.
12 Draw the ray diagrams of Ramsden’s eye piece and Huygen’s eye – piece and mention two differences between them.
13. How light is polarized by pile of plates? Explain?
14. Explain the effect of dielectric on the energy stored in a capacitor.
1) When battery is disconnected while dielectric is introduced and
2) While dielectric is introduced keeping the battery on in the circuit.
15. What is seebeck effect? Explain how thermo e.m.f. varies with temperature.
16. Derive an expression for Torque acting on a coil with some current through it and kept in a magnetic field.
17. What is nuclear fission and explain liquid drop model of nuclear fission?
18. How junction diode is used as a full wave rectifier? Explain?
SECTION – C
i) Answer any two questions.
ii) All are long answer type questions.
iii) Every correct answer carries eight marks.
iv) Every answer may be limited to 300 words.
A string vibrates with frequency 200 Hz. Its length is increased to 4.3 times the initial length and tension is adjusted till the string vibrates with frequency 300 Hz. What is the ratio of the new tension to the original tension?
20. Describe the construction and working of Vibration Magnetometer. Explain the theory to determine magnetic moment of a Bar magnet and Horizontal component of the Earth’s magnetic induction at a place.
21. What is photo electric effect? Mention the laws of photoelectric effect. Explain these laws using Einstein’s equation of photoelectric effect.
very short answer questions
1. Write any two uses of dimensional formulas.
2. Write the two angles of projection for the same horizontal ranges of a projectile
3. Mention any two advantages of friction
4. For which type of fluids, Bernouli’s theorem is applicable?
5. Write the theoretical limits of “Poisson’s ratio”.
6. Define “Moment of Inertia” and write its SI unit/
7. The pressure of a gas at 100oC is at 2 atm. When the gas is heated by keeping volume constant, at what temperature the pressure raises to 3 atm.?
8. What is “Triple point”? Write the value of triple point of water.
9. Why a gap should be left between the two successive rails?
10. Define “Emissive power” and “Absorptive power”.1. If the units of length and mass are doubled, how the unit of density is changed?
2. Mention the direction of motion of the projectile at the point of its maximum height. At that point, give the value of its velocity.
3. What happens to the frictional force if its surface is moderately polished and heavily polished?
4. Write Poiseuilli’s equation and explain the terms in it.
5. Within elastic limit, if stress is equal to Young’s modulus, what is the final length of the wire undergoing stress.
6. Is steel more elastic or less elastic than rubber? Why?
7. If a glass is compressed isothermally to 1/4th of its volume, find the ratio of initial and final pressures.
8. Define zeroth law of thermodynamics and first la of thermodynamics.
9. If coefficient of areal expansion is 12 X 10-6 oC-1, then find coefficient of cubical expansion of solid.
10. Which metal is used to seal glass? Why?1. Prove that Planck’s constant and angular momentum have same dimensions.
2. Distinguish between centre of mass and centre of gravity
3. Mention the laws of friction?
4. Define “angle of contact”. What are its values for pure water and mercury?
5. What is the significance of capillarity in daily life?
6. State Bernoulli’s theorem. For which type of fluids, Bernoulli’s theorem is applicable?
7. Define Boyle’s law and Charles law of a gas.
8. State first and second laws of thermodynamics.
9. Define triple point. Give the value of triple point of water.
10. Define Kirchhoff’s law of heat radiation and write its mathematical form.11. State “parallelogram Law” of vectors and derive an equation for the magnitude of resultant vector.
12. Show that in case of one dimensional elastic collision, the relative velocity of approach of two colliding bodies before collision is equal to the relative velocity of separation after collision.
13. Find the centre of mass of a system of masses 1kg, 2 kg, 3 kg and 4 kg located at the pints (0,0), (1,0) (1,1) and (0,1).
14. State and prove the parallel axes theorem of “moment of Inertia”.
15. Define Escape Velocity and derive the equation V= √2gR
16. Show that Cp-Cv = R
17. What is Capillarity? What should be the radius of capillary tube? If the water has to raise to a height of 6 cm in it? [Surface tension of water is 7.2 X 10-2 Nm-1 , g = 10 ms-2, Density of water is 103 kg m-3
11. Define parallelogram law of vectors and derive an equation for the magnitude of resultant vector.
12. Show that in the case of one dimensional elastic collision, the relative velocity of approach of two colliding bodies before collision is equal to the relative velocity of separation after collision.
13. Three particles of mass 1 kg, 2 kg, 3 kg, are located at co-ordinates (1,2,3), (2,3,1) and (3,1,2) respectively. Find the co-ordinates of centre of mass of the system.
14. State and prove the perpendicular axes theorem of moment of inertia.
15. Define orbital velocity and derive a formula for it
16. Derive Cp-Cv = R.
17. Define capillarity. Water rises to a length of 3 cm in a capillary tube on the earth, find the height upto which the water rises in the same capillary tube on the moon.
18. Define and explain Kirchhoff’s law. Mention two applications of Kirchhoff’s law.
19. Define potential and kinetic energies and deduce equations for them.
11. If the magnitude of the resultant of two equal vectors is equal to the magnitude of one of the vectors, find the angle between them.
12. Show that the trajectory of an object thrown horizontally from certain height is a parabola.
13. Why pulling the lawn roller is preferred to pushing the lawn roller?
14. Define Escape velocity and derive an equation for it.
15. Define Simple pendulum, Derive an equation for the time period of a simple pendulum,
16. Describe the behaviors of a wire under gradually increasing load.
17. Describe an experiment to determine the coefficient of apparent expansion of a liquid using specific gravity bottle.18. Derive the relation between volume coefficient and pressure coefficient of a gas.
19. What is “Energy”? State and prove the “Law of conservation of Energy “in the case of a freely falling body.
20. What is Simple Harmonic Motion? Derive an equation for the “ Time Period” of a simple pendulum,
The displacement of a body in simple harmonic motion is x = 4 cos (3πt + π/6).
21. Derive the relation between the co-efficients of Apparent and Real expansions of a Liquid. Describe an experiment to determine the coefficient of apparent expansion of a liquid, using specific gravity bottle.
20. Show that the motion of a simple pendulum is simple harmonic and derive an equation for hits time period. The displacement of a body executing simple harmonic motion is given by y= 5 sin ( 2πt + π/4). Find its amplitude and phase difference
21. Derive the relation between the coefficients of apparent and real expansions of a liquid. Describe an experiment to determine the coefficient of apparent expansion of a liquid using specific gravity bottle.
june 2004
19. State the law of conservation of energy and prove it in the case of a body projected vertically upwards
Find the power of an electric motor if it lifts 200 kg of water in 5 minuits from a well of 120 m depth.
20, State and prove the parallel axes theorem of moment of inertia. State the law of conservation of angular momentum.
A fly wheel has mass 140 kg, and radius of gyration 3.5 m, Find the moment of inertia of the fly wheel.
21. Define ideal gas. Describe the method to determine the pressure coefficient of a gas by Jolly’s bulb apparatus.
Give the value of universal gas constant and mention its units.
1. What is a collision? Mention the types of collisions.
It is the process of mutual interaction between the bodies in which redistribution of momentum takes place is called collision. These are of two types.
1. Elastic collision 2. Inelastic collision
2. Which physical quantity remains constant (i) in elastic collision (ii) in an in – elastic collision.
In an elastic collision both momentum and kinetic energy of the system are constant.
In an in-elastic collision only momentum remains constant
3. Define co – efficient of restitution and state its value in case of elastic and inelastic collisions.
The ration between the relative velocity of separation after collision to the relative velocity of approach before collision is called coefficient of restitution. For two colliding bodies e = (v2 – v2 ) / u1 – u2.
4. Distinguish between elastic and in – elastic collisions?
| Elastic collision | Inelastic collision |
| 1. Both momentum and kinetic energy are conserved | Only momentum is conserved |
| 2. for perfectly elastic collision e = 1 | 2. for perfectly in elastic collision e = 0 |
| 3. the bodies move separately after the collision | 3. the bodies stick together after collision |
| 4. temperature of the system does not change | 4. temperature of system changes |
| 5. Ex: Collision between nuclei & fundamental particles | 5. Ex: Collision between grossy bodies. |
For elastic collision e = 1.
For inelastic collision e = 0.
Very short answer questions.
- What is inertia?
Ans: The resistance of the body to change its state of rest or of uniform motion in a straight line is called INERTIA of the body.
- What is the mass of a body?
The property of the body which determines its resistance to change its state is called the mass of the body.
- “Mass is a measure of inertia” Explain?
We know a = F/m . More is the mass, less is the acceleration and more is the inertia. Thus, mass of a body is a quantitative measure of its inertia.
- State and define the unit of force in SI unit?
F = ma. If, m = 1 kg, g = 1 m /s2. we get F = 1N, and the SI unit of force is newton, and it can be defined as the force which when acting on a body of mass 1 kg produces in it an acceleration of 1 m/s2.
- Are the three laws of
No,
- What is ‘Tension’ in a cable?
The force exerted by the cable at any point inside the cable is called the tension in the cable at that point.
- What is an ideal rope thread)?
The rope which is inextensible, torsion less, frictionless is said to be an ideal rope.
- Can internal forces (force exerted on one part of the system by another part of the system) cause motion?
No.
- Can the passengers in a stationary bus make the bus movie by pushing it? Why?
No, because, internal forces can’t cause motion in the system.
- A sail boat cannot be propelled by blowing air on the sail from a fan in the same boat. Why?
No, because, internal forces can’t cause motion in the system.
- A man sitting in a chair cannot lift the chair by pulling is arms. Why?
No, because, internal forces can’t cause motion in the system.
- The dust particles can be removed from the carpet by beating it. What principle is involved here?
Moment of inertia due to rest.
Explanation: When a quick jerk is given in the carpet, all the dust particles remain at rest and the carpet moves away from it, thus dust particles can be removed.
- Passengers in a moving bus tend to fall forward. When the bus stops suddenly. Why?
Moment of inertia due to motion
Explanation: When the bus is in motion, body of the passenger will be under motion along with the bus. When the bus stops suddenly, feet comes to rest where as his body under motion due to the moment of inertia due to motion, thus the passenger falls forward.
- An athlete runs through a distance before taking a long jump or a high jump. Why?
To overcome the moment of inertia due to rest.
- When a bus suddenly turns towards right the passengers inside are pushed to their left. Why?
Moment of inertia due to direction.
- What is the main purpose served by a pulley?
To change the direction of the tension in the rope.
- What is a resultant force? Find the resultant force when two forces are perpendicular?
The vector sum of the all the forces acting on a particle is equal to the resultant force.
Resultant force = √(F12+ F22 + 2 F1F2 cos θ)
Since they are perpendicular to each other θ = 90° and
Resultant force = √(F12+ F22 ).
- Define impulse and state its SI units?
Impulse is defined as product of the large amount of force and the short time for which the force acts. It is a vector. It has the same direction of force. It is expressed in N – S.
- A man weighs 500 N. A lift carrying him falls freely. What is the apparent weight of the man in the lift?
Zero. Since if the lift is feely falling, a = g.
And W’ = mg = ma = 0.
- When a lift moving up with an acceleration twice that of acceleration due to gravity, what is apparent weight of a person whose real weight is 400 N?
Given W = 400 N; a = 2g;
W’ = mg (1 + a/g)
W’ = mg (1 + 2g / g)
W’ = 400 (3) = 1200 N.
- Calculate the impulse on a body at rest when acted upon by a force of 4N for 2 sec
Impulse = F X t = 4 x 2 = 8 N – S.
- If a lorry and a car moving with some momentum, are brought to rest by applying some resistive force, which travels more distance before coming to rest.?
Car, as F x S = P2/2m, but F1 = F2 AND P1 = P2
Therefore S α 1/m, i.e., the distance traveled is inversely proportional to mass.
- At what point in the path of a vertically projected body, the kinetic and potential energies are same?
Ans : If the maximum height reached by the body is H, both P.E and K.E are equal at a height H/2.
- Two bodies of different masses have the same momentum. Which will have more kinetic energy?
Ans : Lesser mass possesses more K.E . since KE α 1/m.
- “A cricket ball gets deformed when it is continuously hit by a bat”. Why?
Ans : Because the force acting on the ball by the bat in very less time . If the time of impact is less more force is acted on it . therefore it deforms .
- A body having a velocity of 2 m/s has 1 j kinetic energy. What is its mass?
Ans : K.E =1/2 mv2
i.e., ½ m(4)=1,
2m=1 => m = ½ kg.
- What happens to KE of a body when 3/4th of its mass is removed, and velocity is doubled?
Ans: K.E = ½ mv2
Now KE is KE1 ,
KE1=1/2 (m/4)(2v)2 =1/2 m/4 4v2
ð KE1=1/2 MV2
ð It is unchanged.
- Why does a cricketer pulls his hands backwards, while taking a catch?
In order to increase the time of impact thereby receiving a less force on his hands due to the ball
Shock absorbers are fitted to vehicles. Why?
When the vehicles cross overt the speed breakers, the shock absorbers will slowly compress and increase the time of impulse. Thereby the rider travels with less opposing force due to the impact- If KE of a body is equal to momentum. Find its velocity in SI units?
Since kinetic energy of the body is equal to its momentum
½ m v2 = mv
31. When a gun fires a bullet out of the gun, and bullet which will have greater momentum and which will have greater K.E?
The gun & bullet will have same momentum. ( from law of conservation of momentum)
K.E = P2/2m
32.Calculate resultant acceleration when two forces of magnitude 13 N and 5 N , which are perpendicular to teach other act on a 2 kg mass?
A = √ (F12 + F22)/m = √ (132 + 52)/2 = √194 / 2 m/sec 2.
33.What is the distance through which a body moves when a constant force of 5 N acts on it to change its K.E from 17 J to 32?
W = Change in K. E.
F x S = ½ m v 2 – ½ m u 2
5 x S = 32 – 17
S = 3 m.
34. Three forces of magnitude F are acting along the directions North, East and West on a body. What is the magnitude and direction of the resultant force?
Magnitude F and direction North.
Since, the forces in East and West directions will nullify each other.
35. Can a body have finite acceleration and zero KE?
Yes, a body can have finite acceleration even though kinetic energy is zero.
Ex: 1) When simple pendulum or a loaded spring is at its extreme position i.e., at maximum displacement point velocity, v = 0, so, kinetic energy is zero. But it has some acceleration directed towards mean position.
2) For a body released from certain height velocity when dropped is zero. So kinetic energy is zero. But still acceleration due to gravity acts on it.
36. State Law of conservation of linear momentum?
The algebraic sum of momentum before collision is equal to the sum of momentum after collision.
m1u1 + m2 u2 = m1 v1 + m2 v2
37. Distinguish between conservative and non conservative forces. Give one example each?
| Conservative forces | Non – conservative forces |
| 1. The work done in a closed path is zero. 2. The work done depends only upon the locations of the two points and independent upon the path followed | 1. The work done by the force on a body along a closed path is not zero. 2. The work done depends upon the path followed |
| 3.Ex: Gravitational force, The elastic force exerted on by an ideal spring | Ex: Frictional force, Electromagnetic induction |
Lesson wise very short answer questions with answers.
(According to board of intermediate academy text book)
- Units and dimensions and errors and approximations
- Elements of vectors
- Kinematics
- Dynamics
- Collisions
- Center of mass
- Friction
- Rotatory motion
- Gravitation
- Simple harmonic motion
- Elasticity
- Surface tension
- Viscosity
- Thermal expansion of materials
- Thermodynamics
- Transmission of heat
- Can the velocity at any point on the path be zero in the case of a body projected vertically upwards? Explain?
Ans:
yes, at the height point when the body projected vertically upwards.
- Define the maximum height, time of ascent and time of descent for an object vertically thrown up.
Ans:
Max height: The distance traveled by a vertically projected body before its velocity becomes zero.
Time of ascent: The time taken by a vertically projected body to reach the max height is called time of ascent.
Time of descent: The time taken by a vertically projected body to traveled from its max height position to the point of projection is called time of descent.
- Can a body moving in a two dimensional plane has acceleration in only 1 dimension?
Ans:
Yes, in case of oblique projectile the body possesses two dimensional motion, but it has acceleration due to gravity, which is one dimensional.
- Mention the direction of motion the projectile at the point of its max height?
Ans:
At the max height position of a projectile, its direction of motion is horizontal.
- Mention the path of an object which is dropped outside through the window, of a moving vehicle. Why is it so?
Ans:
The path is parabola, because it is like a horizontal projectile, whose horizontal velocity is equal to the velocity of the vehicle with respect to the observer on the ground.
- A stone is thrown horizontally and another is dropped freely from the same height. Which of the two will reach the ground early? Explain?
Ans:
Both reach the ground at the same time. The time of journey is given by t = √ (2h / g). as initial velocity in the downward direction for both the cases is zero.
- For a stone what is the ratio of distances covered in 1st, 3rd, and 5th seconds of its free fall?
Ans:
According to
Sn = u + a (n – ½)
S1 = 0 + g (1 – ½) = g/2
S3 = 0 + g (3 – ½) = 5g/2
S5 = 0 + g (5 – ½) = 9g/2
S1 : S3 : S5 = 1: 5 : 9
1. If the units of length and mass are doubled, how the unit of density is changed?
2. Mention the direction of motion of the projectile at the point of its maximum height. At that point, give the value of its velocity.
3. What happens to the frictional force if its surface is moderately polished and heavily polished?
4. Write Poiseuilli’s equation and explain the terms in it.
5. Within elastic limit, if stress is equal to Young’s modulus, what is the final length of the wire undergoing stress.
6. Is steel more elastic or less elastic than rubber? Why?
7. If a glass is compressed isothermally to 1/4th of its volume, find the ratio of initial and final pressures.
8. Define zeroth law of thermodynamics and first la of thermodynamics.
9. If coefficient of areal expansion is 12 X 10-6 oC-1, then find coefficient of cubical expansion of solid.
10. Which metal is used to seal glass? Why?
SECTION – B
11. Define parallelogram law of vectors and derive an equation for the magnitude of resultant vector.
12. Show that in the case of one dimensional elastic collision, the relative velocity of approach of two colliding bodies before collision is equal to the relative velocity of separation after collision.
13. Three particles of mass 1 kg, 2 kg, 3 kg, are located at co-ordinates (1,2,3), (2,3,1) and (3,1,2) respectively. Find the co-ordinates of centre of mass of the system.
14. State and prove the perpendicular axes theorem of moment of inertia.
15. Define orbital velocity and derive a formula for it
16. Derive Cp-Cv = R.
17. Define capillarity. Water rises to a length of 3 cm in a capillary tube on the earth, find the height upto which the water rises in the same capillary tube on the moon.
18. Define and explain Kirchhoff’s law. Mention two applications of Kirchhoff’s law.
19. Define potential and kinetic energies and deduce equations for them.
SECTION – C
________________________________________________________
20. Show that the motion of a simple pendulum is simple harmonic and derive an equation for hits time period. The displacement of a body executing simple harmonic motion is given by y= 5 sin ( 2πt + π/4). Find its amplitude and phase difference
21. Derive the relation between the coefficients of apparent and real expansions of a liquid. Describe an experiment to determine the coefficient of apparent expansion of a liquid using specific gravity bottle.
1. Prove that Planck’s constant and angular momentum have same dimensions.
2. Distinguish between centre of mass and centre of gravity
3. Mention the laws of friction?
4. Define “angle of contact”. What are its values for pure water and mercury?
5. What is the significance of capillarity in daily life?
6. State Bernoulli’s theorem. For which type of fluids, Bernoulli’s theorem is applicable?
7. Define Boyle’s law and Charles law of a gas.
8. State first and second laws of thermodynamics.
9. Define triple point. Give the value of triple point of water.
10. Define Kirchhoff’s law of heat radiation and write its mathematical form.
SECTION – B
11. If the magnitude of the resultant of two equal vectors is equal to the magnitude of one of the vectors, find the angle between them.
12. Show that the trajectory of an object thrown horizontally from certain height is a parabola.
13. Why pulling the lawn roller is preferred to pushing the lawn roller?
14. Define Escape velocity and derive an equation for it.
15. Define Simple pendulum, Derive an equation for the time period of a simple pendulum,
16. Describe the behaviors of a wire under gradually increasing load.
17. Describe an experiment to determine the coefficient of apparent expansion of a liquid using specific gravity bottle.
18. Derive the relation between volume coefficient and pressure coefficient of a gas.
------------------------------------------------------------------------------------------------
19. State the law of conservation of energy and prove it in the case of a body projected vertically upwards
Find the power of an electric motor if it lifts 200 kg of water in 5 minuits from a well of 120 m depth.
20, State and prove the parallel axes theorem of moment of inertia. State the law of conservation of angular momentum.
A fly wheel has mass 140 kg, and radius of gyration 3.5 m, Find the moment of inertia of the fly wheel.
21. Define ideal gas. Describe the method to determine the pressure coefficient of a gas by Jolly’s bulb apparatus.
Give the value of universal gas constant and mention its unit
MARCH 2005 PHYSICS I YEAR PHYSICS PAPER
SECTION - A
1. Write any two uses of dimensional formulas.
2. Write the two angles of projection for the same horizontal ranges of a projectile
3. Mention any two advantages of friction
4. For which type of fluids, Bernouli’s theorem is applicable?
5. Write the theoretical limits of “Poisson’s ratio”.
6. Define “Moment of Inertia” and write its SI unit/
7. The pressure of a gas at 100oC is at 2 atm. When the gas is heated by keeping volume constant, at what temperature the pressure raises to 3 atm.?
8. What is “Triple point”? Write the value of triple point of water.
9. Why a gap should be left between the two successive rails?
10. Define “Emissive power” and “Absorptive power”.
11. State “parallelogram Law” of vectors and derive an equation for the magnitude of resultant vector.
12. Show that in case of one dimensional elastic collision, the relative velocity of approach of two colliding bodies before collision is equal to the relative velocity of separation after collision.
13. Find the centre of mass of a system of masses 1kg, 2 kg, 3 kg and 4 kg located at the pints (0,0), (1,0) (1,1) and (0,1).
14. State and prove the parallel axes theorem of “moment of Inertia”.
15. Define Escape Velocity and derive the equation V= √2gR
16. Show that Cp-Cv = R
17. What is Capillarity? What should be the radius of capillary tube? If the water has to raise to a height of 6 cm in it? [Surface tension of water is 7.2 X 10-2 Nm-1 , g = 10 ms-2, Density of water is 103 kg m-3
18. Define and explain Kirchhoff’s law. Mention any two applications of Kirchoff’s law.
SECTION - C
19. What is “Energy”? State and prove the “Law of conservation of Energy “in the case of a freely falling body.
20. What is Simple Harmonic Motion? Derive an equation for the “ Time Period” of a simple pendulum,
The displacement of a body in simple harmonic motion is x = 4 cos (3πt + π/6).
21. Derive the relation between the co-efficients of Apparent and Real expansions of a Liquid. Describe an experiment to determine the coefficient of apparent expansion of a liquid, using specific gravity bottle.
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SECTION - A
----------------------------------------------------------------------------------
Note:
Answer all of the following
Each Qn carries 2 marks
All are very short answer type questions
Answer in one or two sentences only and in one place in proper order.
___________________________________________________
1. Define critical angle and mention its relationship with refractive index in optics.
2. What is the condition that explains the formation of bright and dark regions in the interference pattern in Young's double slit experiment? Explain its terms?
3. What are Franhofer lines and what is their importance?
4. Mention the uses of vibration magnetomerer?
5. Three capacitances 4 μF, 6μF, 8 μF are connected in parallel, what is the ratio of charges in them and what is the ratio of potential differences across them?
6. When is the series combination of cells advantageous and why?
7. What are Peltier and Thomson effects?
8. If a proton and an electron have same de-broglie wavelength, which has more momentum and kinetic energy?
9. What are the conditions necessary for a chain reaction to take place?
10. What are the charge carriers inside of p-n-p and n-p-n transistors?
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SECTION - B
-------------------------------------------------------------------------------------
Note:
Answer any SIX questions
Each question carries FOUR marks
All are short answer type questions
Limit your answer to 75 words only
------------------------------------------------------------------------------------
11. What are beats? How are they produced? Explain with two examples?
12. Draw the ray diagram for Ramsden eye produced? Explain with two examples.
13. Explain how plane polarized light is obtained by reflection?
14. How are the magnetic moments of two short bar magnets compared by equal distance method in Tan A position?
15. Four charges of equal magnitude 2 μC are kept at the four corners of a square of side 5 cm. Find the force experienced by any one of them?
16. Explain how a galvanometer can be converted into an ammeter and a voltmeter?
17. What are mass defect and binding energy? How are they related?
18. What is rectification? Explain the working of p-n junction diode as a full wave rectifier?
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SECTION C
--------------------------------------------------------------------------------------
i) Answer any two questions.
ii) All are long answer type questions.
iii) Every correct answer carries eight marks.
iv) Every answer may be limited to 300 words.
19. Explain the formation of stationary waves in stretched strings and state the laws of transverse waves in stretched string.
A wire of length 1 m and mass 20 grams is stretched by a tension of 800N. Find its fundamental frequency
20. State and explain Kirchoff’s laws in electricity and apply them to derive whatstone bridge principle.
Four resistances P, Q, R, S of v alues 2Ω, 2Ω, 2Ω , and 3Ω are arranged to form a wheatstone bridge. Calculate the value of resistance to be connected in parallel to S so that the bridge is balanced.
21. Describe Thomson’s experiment to measure specific charge of an electron. Calculate the velocity of electrons accelerated by a potential difference of 104 V. The charge of the electron is 1.6x10 -19 C and mass is 9.11 x 10 -31 kg.
ALL THE BEST
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