Chapter 10 - Geometrical Optics
1. A lens is a piece of opaque material that can focus a transmitted beam of light.
2. A lens is a piece of transparent material that can focus transmitted light.
3. A lens is a piece of transparent material that can focus reflected beam of light.
4. A lens is usually bounded by two spherical surfaces.
5. A lens is usually bounded by two plane surfaces.
6. A lens is usually bounded by the spherical and plane surfaces.
7. Lenses fall into two categories.
8. A convex lens is thicker in the middle and thinner on the edges.
9. A convex lens is thinner in the middle and thicker on the edges.
10. A convex lens converges the light rays towards its optical axis.
11. A convex lens diverges the light rays away from the optical axis.
12. A concave lens is thinner in the middle and thicker on the edges.
13. A diverging lens is thicker in the middle and thinner on the edges.
14. A concave lens bends the light rays from its optical axis.
15. A diverging lens converges the light rays from its optical axis.
16. The point to which the light rays are brought to focus is called Principal Focus.
17. The point to which the light rays are brought to focus is called optical axis.
18. Optical centre of the lens is the point in it whrough which the light rays will pass without any deviation.
19. In converging lens when the object is placed at 2F then its image will form beyond 2F on the other side of the lens.
20. The focal length of the converging lens is taken as positive.
21. The reciprocal of the focal length of equivalent lens is equal to the sum of the reciprocals of the focal lengths of the two lenses.
22. The power of the equivalent lens is equal to the sum of the power of the two lenses.
23. The defect in the lens due to the fact that different wave lengths of the light refracted by lens focus at different points is called chromatic aberration.
24. The lens defect call spherical aberration can by minimized by using the central part of the lens.
25. Magnification of the lens is defined as the ratio of the size of the object to the size of the image.
26. The apparent size of an object does not depend upon the visual angle.
27. The least distance of distinct vision for a normal person is 25cm.
28. Compound microscope consists of three lenses.
29. In compound microscope the focal length of the objective is less than the focal length of eye-piece.
30. Compound microscope gives the higher magnification than that of magnifying glass.
31. Astronomical Telescope consists of two diverging lenses.
32. The magnifying power of the astronomical telescope is the ratio of focal length of eye-piece to the focal length of the objective.
33. In Galilean telescope the concave lens will be used as an eye piece.
34. In terrestrial telescope third lens is called erecting lens.
35. In spectrometer collimeter is fixed to the base of the instruments.
36. The spectrum of the light, which consists of a series of bright lines is called Line Spectrum.
37. In eye the iris is a muscular diaphragm that controls the size of the pupil.
38. When the eye produces an image of distant object behind retina, the abnormality is known as Myopia.
39. In the abnormality named as Hyperopia the person is said to be far sighted.
40. Far sightedness can be corrected by using the convex lens.
Showing posts with label Physics Class XI (BIEK). Show all posts
Showing posts with label Physics Class XI (BIEK). Show all posts
Physics XI Karachi Board True and False - Chapter 9
Chapter 9 - Wave Aspect of Light
1. Maxwell presented wave theory of light.
2. No phenomenon can be explained from both particle and wave nature of light.
3. Newton suggested corpuscular theory for light.
4. Changing magnetic field can produce electric field.
5. Stationary magnetic field can produce electric field.
6. The speed of light in free space is 3 x 108 m/s.
7. Maxwell presented electromagnetic theory.
8. The wavelength of visible light is less than 4000A°.
9. The wavelength of X-rays is of order of 1 nm.
10. Millikan was awarded Noble Prize in 1923.
11. Photoelectric effect and Compton effect can be explained by corpuscular theory.
12. The distance between two consecutive wave fronts is equal to one half of wavelength.
13. When two monochromatic waves of light reach at a point in phase, they are said to interfere destructively.
14. Interference of light is a result of superposition of two waves.
15. Light waves are electromagnetic waves.
16. X-rays are mechanical waves.
17. Light waves are longitudinal in nature.
18. Light can not be polarized.
19. Newton’s rings are formed due to diffraction of light.
20. In thin film interference, the condition for constructive and destructive interference is same as that for ordinary interference.
21. To obtain Newton’s rings a convex lex of very large radius of curvature is required.
22. Diffraction is a special type of interference.
23. Diffraction is observed due to obstructed parts of a wave front.
24. Newton’s rings can be obtained by using ordinary light.
25. In Newton’s rings the central ring is always bright.
26. Two independent monochromatic sources can produce interference pattern in Young’s Experiment.
27. Semi silvered plate is used in Michelson’s interferometer to obtain phase coherence.
28. Newton’s rings are formed due to the phenomenon of thin film interference.
29. The formation of interference fringes in Michelson’s Interferometer can be explained on the basis of thin film interference.
30. In Michelson’s Interferometer a broad or exteded source of monochromatic light is required.
31. Diffraction grating can also be termed as interference grating.
32. X-rays can be diffracted by using a diffraction grating.
33. The grating element is equal to the length of diffraction grating.
34. A diffraction grating is a glass plate on which few lines are ruled per cm.
35. In Michelson’s Interferometer both complete mirrors should be moveable.
36. In Fraunhofer’ diffraction both screen and source are removed at a large distance from the diffracting object.
37. In Fresnel diffraction only screen is at finite distance where as source is at infinite distance from diffracting object.
38. Interference fringes can be obtained in Young’s Experiment by using ordinary light.
39. Longitudinal waves can be detected by using the phenomenon of polarization.
40. Intensity of light increases while passing through tourmaline crystal.
41. When light passes through tourmaline crystal magnetic vector is absorbed completely.
42. Polarization can be used to determine the concentration of sugar in solution.
43. The relation ml = d sin q is called Bragg’s Law.
44. In diffraction pattern the bright hands are of non-uniform intensity.
45. For constructive interference, in thin film interference, the path difference should be zero or integral multiple of wavelength.
1. Maxwell presented wave theory of light.
2. No phenomenon can be explained from both particle and wave nature of light.
3. Newton suggested corpuscular theory for light.
4. Changing magnetic field can produce electric field.
5. Stationary magnetic field can produce electric field.
6. The speed of light in free space is 3 x 108 m/s.
7. Maxwell presented electromagnetic theory.
8. The wavelength of visible light is less than 4000A°.
9. The wavelength of X-rays is of order of 1 nm.
10. Millikan was awarded Noble Prize in 1923.
11. Photoelectric effect and Compton effect can be explained by corpuscular theory.
12. The distance between two consecutive wave fronts is equal to one half of wavelength.
13. When two monochromatic waves of light reach at a point in phase, they are said to interfere destructively.
14. Interference of light is a result of superposition of two waves.
15. Light waves are electromagnetic waves.
16. X-rays are mechanical waves.
17. Light waves are longitudinal in nature.
18. Light can not be polarized.
19. Newton’s rings are formed due to diffraction of light.
20. In thin film interference, the condition for constructive and destructive interference is same as that for ordinary interference.
21. To obtain Newton’s rings a convex lex of very large radius of curvature is required.
22. Diffraction is a special type of interference.
23. Diffraction is observed due to obstructed parts of a wave front.
24. Newton’s rings can be obtained by using ordinary light.
25. In Newton’s rings the central ring is always bright.
26. Two independent monochromatic sources can produce interference pattern in Young’s Experiment.
27. Semi silvered plate is used in Michelson’s interferometer to obtain phase coherence.
28. Newton’s rings are formed due to the phenomenon of thin film interference.
29. The formation of interference fringes in Michelson’s Interferometer can be explained on the basis of thin film interference.
30. In Michelson’s Interferometer a broad or exteded source of monochromatic light is required.
31. Diffraction grating can also be termed as interference grating.
32. X-rays can be diffracted by using a diffraction grating.
33. The grating element is equal to the length of diffraction grating.
34. A diffraction grating is a glass plate on which few lines are ruled per cm.
35. In Michelson’s Interferometer both complete mirrors should be moveable.
36. In Fraunhofer’ diffraction both screen and source are removed at a large distance from the diffracting object.
37. In Fresnel diffraction only screen is at finite distance where as source is at infinite distance from diffracting object.
38. Interference fringes can be obtained in Young’s Experiment by using ordinary light.
39. Longitudinal waves can be detected by using the phenomenon of polarization.
40. Intensity of light increases while passing through tourmaline crystal.
41. When light passes through tourmaline crystal magnetic vector is absorbed completely.
42. Polarization can be used to determine the concentration of sugar in solution.
43. The relation ml = d sin q is called Bragg’s Law.
44. In diffraction pattern the bright hands are of non-uniform intensity.
45. For constructive interference, in thin film interference, the path difference should be zero or integral multiple of wavelength.
Physics XI Karachi Board True and False - Chapter 8
Chapter 8 - Wave Motion and Sound
1. In SHM acceleration is proportional to displacement and is directed towards mean position.
2. SHM is a motion under elastic-restoring force.
3. In SHM the system must have friction.
4. The motion of the particle moving in a circle is SHM.
5. The motion of the projection of a particle moving in a circle along one of its diameter is simple harmonic.
6. The motion of a simple pendulum is always SHM.
7. The motion of simple pendulum may be simple harmonic.
8. The time period of a simple pendulum increases with its length.
9. The time period of a simple pendulum changes from place to place.
10. Kinetic energy of a system executing SHM is always conserved.
11. Potential energy of a system executing SHM is always conserved.
12. Total energy of system executing SHM is always conserved.
13. The total energy of a particle executing SHM is directly proportional to the frequency of oscillation.
14. The total energy of a particle executing SHM is directly proportional to square of its amplitude of oscillation.
15. If pendulum is transported to moon. It will go fast.
16. The particle velocity is minimum at the nodal points in a stationary waves.
17. The distance between any two successive nodes in a stationary waves is equal to a quarter of its wavelength.
18. Sound waves can travel through water.
19. Sound waves travel faster in air then iron.
20. In dense atmosphere of gases, sound waves travel faster in air then iron.
21. The velocity of sound in a fluid medium varies directly as its absolute temperature.
22. The change in pressure and volume of a gas due to propagation of a sound wave through it is isothermal.
23. In a closed organ pipe, a node is formed at the close end.
24. When the intensity of sound wave is great, its loudness is also great.
25. In debating halls, it is good to have low flat ceiling.
26. The velocity of sound in air is directly proportional to the pressure of air.
27. The frequency of transverse vibration in a sonometer is doubled when the tension is increased four times, keeping other factors constant.
28. The pitch of a sound note decreases as the source of sound approaches the observer.
29. The pitch of a sound note increases as both source and listener move towards each other.
30. The frequency of the beats produced by two simultaneously exicited turning forks decreases when the tuning fork of higher frequency is loaded with little wax.
31. Normal human ear can detect upto twenty beats per second.
32. The pitch of a musical note increases with the amplitude of vibration.
33. When stationary waves are produced in a stretched string, the tension is maximum at the nodes.
34. In case of stationary waves produced in a stretched string, the tension is maximum at the nodes.
35. In case of stationary waves produced in a stretched string, first multiple is equal to second harmonic.
36. In case of sonometer, the velocity of standing waves produced is directly proportional to the mass per unit length of vibrating wire.
37. Laplace’s correction was suggested in Newton’s formula due to fact that propagation of sound waves through air is adiabatic.
38. The terms quality and timber are used for the same property.
39. When two tuning forks of frequencies 256Hz and 259 Hz, excited together and are sounded simultaneously. The frequency of beats produced is 6.
40. The term acoustics is used to describe the way in which sound is reproduced in practical situations.
41. The standing waves are produced due to exactly similar progressive waves travelling through any medium in the same direction.
42. The simple pendulum comes to rest after some time due to the pull of earth.
43. When sound waves strike a hard surface, they are completely absorbed.
44. The sound waves are longitudinal in nature.
45. The sound waves are electromagnetic waves.
1. In SHM acceleration is proportional to displacement and is directed towards mean position.
2. SHM is a motion under elastic-restoring force.
3. In SHM the system must have friction.
4. The motion of the particle moving in a circle is SHM.
5. The motion of the projection of a particle moving in a circle along one of its diameter is simple harmonic.
6. The motion of a simple pendulum is always SHM.
7. The motion of simple pendulum may be simple harmonic.
8. The time period of a simple pendulum increases with its length.
9. The time period of a simple pendulum changes from place to place.
10. Kinetic energy of a system executing SHM is always conserved.
11. Potential energy of a system executing SHM is always conserved.
12. Total energy of system executing SHM is always conserved.
13. The total energy of a particle executing SHM is directly proportional to the frequency of oscillation.
14. The total energy of a particle executing SHM is directly proportional to square of its amplitude of oscillation.
15. If pendulum is transported to moon. It will go fast.
16. The particle velocity is minimum at the nodal points in a stationary waves.
17. The distance between any two successive nodes in a stationary waves is equal to a quarter of its wavelength.
18. Sound waves can travel through water.
19. Sound waves travel faster in air then iron.
20. In dense atmosphere of gases, sound waves travel faster in air then iron.
21. The velocity of sound in a fluid medium varies directly as its absolute temperature.
22. The change in pressure and volume of a gas due to propagation of a sound wave through it is isothermal.
23. In a closed organ pipe, a node is formed at the close end.
24. When the intensity of sound wave is great, its loudness is also great.
25. In debating halls, it is good to have low flat ceiling.
26. The velocity of sound in air is directly proportional to the pressure of air.
27. The frequency of transverse vibration in a sonometer is doubled when the tension is increased four times, keeping other factors constant.
28. The pitch of a sound note decreases as the source of sound approaches the observer.
29. The pitch of a sound note increases as both source and listener move towards each other.
30. The frequency of the beats produced by two simultaneously exicited turning forks decreases when the tuning fork of higher frequency is loaded with little wax.
31. Normal human ear can detect upto twenty beats per second.
32. The pitch of a musical note increases with the amplitude of vibration.
33. When stationary waves are produced in a stretched string, the tension is maximum at the nodes.
34. In case of stationary waves produced in a stretched string, the tension is maximum at the nodes.
35. In case of stationary waves produced in a stretched string, first multiple is equal to second harmonic.
36. In case of sonometer, the velocity of standing waves produced is directly proportional to the mass per unit length of vibrating wire.
37. Laplace’s correction was suggested in Newton’s formula due to fact that propagation of sound waves through air is adiabatic.
38. The terms quality and timber are used for the same property.
39. When two tuning forks of frequencies 256Hz and 259 Hz, excited together and are sounded simultaneously. The frequency of beats produced is 6.
40. The term acoustics is used to describe the way in which sound is reproduced in practical situations.
41. The standing waves are produced due to exactly similar progressive waves travelling through any medium in the same direction.
42. The simple pendulum comes to rest after some time due to the pull of earth.
43. When sound waves strike a hard surface, they are completely absorbed.
44. The sound waves are longitudinal in nature.
45. The sound waves are electromagnetic waves.
Physics XI Karachi Board True and False - Chapter 7
Chapter 7 - Work, Energy and Power
1. The dot product of force and displacement is called power.
2. Work is the scalar product of force and velocity.
3. When the force and displacement are parallel to each other then the work is maximum.
4. The work done on the body is minimum when the force and displacement are perpendicular to each other.
5. The nature of the work is positive when the force and displacement are in the opposite direction.
6. The cross product of force and moment arm is called torque.
7. The dot product of force and velocity is called power.
8. Power is a vector quantity.
9. One joule is equal to 103 erg.
10. One horse power is equal to 550 ft.lb/s.
11. The expression for absolute potential energy of mass m at the surface of the earth is .
12. Power is defined as the rate of doing work.
13. Energy of a body is a vector quantity.
14. Work energy equation is simply law of conservation of energy.
15. The rate of change of momentum multiplied by displacement is called work.
16. The unit of power is watt-hour.
17. Work done in the gravitational field depends upon the path followed.
18. Work done in the gravitational field along a closed path is equal to zero.
19. Einstein’s mass energy equation relation is E = mc2.
20. The tidal energy is due to the rotation of the earth around sun.
21. The dimension of work are ML2T-2.
22. The dimension of work are ML3T-2.
23. Power is the rate of expenditure of energy.
24. When a body falls down from a table then gravitational potential energy transform into kinetic energy.
25. Transformer does not convert one type of energy into another.
26. The unit of work and energy is the same.
27. The energy of a body due to its motion is called kinetic energy.
28. The energy of body due to its change of position is called potential
29. The ability of a body to perform the work is called its power.
30. The source of geothermal energy is the radioactive decay in the earth’s interior.
31. The absolute potential energy of a body in the gravitational field is directly proportional to the mass of the body.
32. The source of nuclear energy is the process of fission of heavy nucleus.
33. The amount of work done in lifting a body from the surface of the earth to the zero point is called the absolute gravitational potential energy.
34. In physics the unit of energy of elementary particles is electron volt.
35. The range of energy of first atomic bomb is about 1012 joules.
1. The dot product of force and displacement is called power.
2. Work is the scalar product of force and velocity.
3. When the force and displacement are parallel to each other then the work is maximum.
4. The work done on the body is minimum when the force and displacement are perpendicular to each other.
5. The nature of the work is positive when the force and displacement are in the opposite direction.
6. The cross product of force and moment arm is called torque.
7. The dot product of force and velocity is called power.
8. Power is a vector quantity.
9. One joule is equal to 103 erg.
10. One horse power is equal to 550 ft.lb/s.
11. The expression for absolute potential energy of mass m at the surface of the earth is .
12. Power is defined as the rate of doing work.
13. Energy of a body is a vector quantity.
14. Work energy equation is simply law of conservation of energy.
15. The rate of change of momentum multiplied by displacement is called work.
16. The unit of power is watt-hour.
17. Work done in the gravitational field depends upon the path followed.
18. Work done in the gravitational field along a closed path is equal to zero.
19. Einstein’s mass energy equation relation is E = mc2.
20. The tidal energy is due to the rotation of the earth around sun.
21. The dimension of work are ML2T-2.
22. The dimension of work are ML3T-2.
23. Power is the rate of expenditure of energy.
24. When a body falls down from a table then gravitational potential energy transform into kinetic energy.
25. Transformer does not convert one type of energy into another.
26. The unit of work and energy is the same.
27. The energy of a body due to its motion is called kinetic energy.
28. The energy of body due to its change of position is called potential
29. The ability of a body to perform the work is called its power.
30. The source of geothermal energy is the radioactive decay in the earth’s interior.
31. The absolute potential energy of a body in the gravitational field is directly proportional to the mass of the body.
32. The source of nuclear energy is the process of fission of heavy nucleus.
33. The amount of work done in lifting a body from the surface of the earth to the zero point is called the absolute gravitational potential energy.
34. In physics the unit of energy of elementary particles is electron volt.
35. The range of energy of first atomic bomb is about 1012 joules.
Physics XI Karachi Board True and False - Chapter 6
Chapter 6 - Gravitation
1. Newton made the hypothesis that every body in the universe exerts a gravitation force of attraction on every other body.
2. The moon’s orbit is about circular.
3. The moon is freely falling to earth.
4. The time taken by the moon to complete one revolution around the earth is 2.36 x 106 seconds.
5. The acceleration of the moon is about 2.72 x 10-3 m/s2.
6. The value of orbits radius of the moon is about 3.84 x 106m.
7. The centripetal acceleration of the moon is given by 4p2R/T.
8. According to the law of gravitation the force of attraction between the two bodies is directly proportional to the sum of their masses.
9. According to the law of gravitation the force of attraction between two bodies is inversely proportional to the square of the distance between their centres.
10. The force with which the earth attracts any body towards its centre is called its weight.
11. The value of g increases with the increase of the distance from the centre of the earth.
12. The value of gravitational constant is 6.673 x 1011 N-m2 /kg2.
13. If the cable carrying the elevator breaks, the elevator descends with acceleration equal to ‘g’.
14. The force of gravity on a body varies slightly from place to place on earth for two reasons, first the shape of the earth and secondly its rotation.
15. Acceleration due to gravity decreases at a faster rate for a point above the surface of earth than for the same point below the surface of earth.
16. Weight of body is a vector quantity.
17. The magnitude of the weight is expressed in the units of force such as Newton.
18. The gravitational force is responsible for the motion of the planets around the sun.
19. An Astronaut in a satellite orbitting the earth experiences a state of weightlessness because the satellite orbitting with a centripetal acceleration equal to ‘g’.
20. Artificial gravity is produced in satellite by spinning it abut its own axis.
21. If the mass of the earth becomes four times then the value of g will be doubled.
22. The acceleration due to gravity varies with latitude on the Earth.
23. Planets revolve round the sun due to gravitational attraction between sun and the planets.
24. Spring balance is used to measure the apparent weight of the body.
25. The value of ‘g’ is directly proportional to the square of the radius of earth.
26. The acceleration due to gravity on moon is about one-fourth the acceleration due to gravity on the surface of the earth.
27. Acceleration due to gravity at the centre of the earth is zero.
28. On the surface of the moon the weight of a body increases as compare to its weight on earth.
29. The value of gravitational acceleration at a distance equal to earth, radius above the earth’s surface is one fourth that of on the surface of the earth.
30. The weight of a body at the pole is greater than at equator.
31. The gravitational pull at equator is more than at poles.
32. The gravitational force of attraction between the two bodies does not depend upon their shape.
33. Weightlessness in artificial satellite is due to out of reach of gravity.
34. The force required to prevent a body from falling or accelerating in a frame of reference is called the apparent weight of the body.
35. When a frame of reference is ascending with a constant acceleration then the apparent weight of the body increases.
1. Newton made the hypothesis that every body in the universe exerts a gravitation force of attraction on every other body.
2. The moon’s orbit is about circular.
3. The moon is freely falling to earth.
4. The time taken by the moon to complete one revolution around the earth is 2.36 x 106 seconds.
5. The acceleration of the moon is about 2.72 x 10-3 m/s2.
6. The value of orbits radius of the moon is about 3.84 x 106m.
7. The centripetal acceleration of the moon is given by 4p2R/T.
8. According to the law of gravitation the force of attraction between the two bodies is directly proportional to the sum of their masses.
9. According to the law of gravitation the force of attraction between two bodies is inversely proportional to the square of the distance between their centres.
10. The force with which the earth attracts any body towards its centre is called its weight.
11. The value of g increases with the increase of the distance from the centre of the earth.
12. The value of gravitational constant is 6.673 x 1011 N-m2 /kg2.
13. If the cable carrying the elevator breaks, the elevator descends with acceleration equal to ‘g’.
14. The force of gravity on a body varies slightly from place to place on earth for two reasons, first the shape of the earth and secondly its rotation.
15. Acceleration due to gravity decreases at a faster rate for a point above the surface of earth than for the same point below the surface of earth.
16. Weight of body is a vector quantity.
17. The magnitude of the weight is expressed in the units of force such as Newton.
18. The gravitational force is responsible for the motion of the planets around the sun.
19. An Astronaut in a satellite orbitting the earth experiences a state of weightlessness because the satellite orbitting with a centripetal acceleration equal to ‘g’.
20. Artificial gravity is produced in satellite by spinning it abut its own axis.
21. If the mass of the earth becomes four times then the value of g will be doubled.
22. The acceleration due to gravity varies with latitude on the Earth.
23. Planets revolve round the sun due to gravitational attraction between sun and the planets.
24. Spring balance is used to measure the apparent weight of the body.
25. The value of ‘g’ is directly proportional to the square of the radius of earth.
26. The acceleration due to gravity on moon is about one-fourth the acceleration due to gravity on the surface of the earth.
27. Acceleration due to gravity at the centre of the earth is zero.
28. On the surface of the moon the weight of a body increases as compare to its weight on earth.
29. The value of gravitational acceleration at a distance equal to earth, radius above the earth’s surface is one fourth that of on the surface of the earth.
30. The weight of a body at the pole is greater than at equator.
31. The gravitational pull at equator is more than at poles.
32. The gravitational force of attraction between the two bodies does not depend upon their shape.
33. Weightlessness in artificial satellite is due to out of reach of gravity.
34. The force required to prevent a body from falling or accelerating in a frame of reference is called the apparent weight of the body.
35. When a frame of reference is ascending with a constant acceleration then the apparent weight of the body increases.
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