ANSWER TO PHY192: Introductory Physics Practical Ii TMA3 IS OUT

 PHY192: Introductory Physics Practical Ii TMA3

Instructions: Answer All .
After Submission, you will not be able to answer these questions

Question 1 : The lens of the human eye is
 concave
 diverging
 converging
 planconcave

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Question 2 : In the circuit diagram shown, the wire PQ has the resistance of $5\Omega$$ and the driver cell has an emf of 2.00 V. What is the value of the resistance R if a balance point is obtained at 0.60 m along PQ when measuring an emf of 6.00mV?
 $195\Omega$
 $495\Omega$
 $95\Omega$
 $995\Omega$

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Question 3 : Diopter measures
 power of lens
 inverse of object distance from lens
 linear magnification of lens
 inverse of image distnce from lens

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Question 4 : In the circuit diagram shown, the device marked X is a -----------------
 jockey
 galvanometer
 voltmeter
 rheostat

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Question 5 : The potentiometer wire plays equivalent role of which of these devices in a circuit?
 galvanometer
 ammeter
 thermostat
 rheostat

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Question 6 : Which of the following is NOT true about a rheostat?
 It is used for varying the current in a circuit
 It is a constant current instrument
 It is a resistor with moving contact
 It is used for varying the resistance in a circuit

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Question 7 : For a metallic conductor, Ohm's law holds provided
 current remains constant
 potential difference varies
 temperature remains constant
 potential difference remains constant

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Question 8 : The image of an object which is between the concave mirror's reflecting surface and its principal focus is
 behind the mirror inverted real and diminished
 behind the mirror erect virtual and enlarged
 in front of the mirror erect real and diminished
 in front of the mirror erect virtual and enlarged

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Question 9 : In an experiment, potential difference is plotted on the vertical axis and current on the horizontal axis. The slope of the graph represents
 resistivity
 resistance
 conductivity
 conductance

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Question 10 : Which of the following is not true about diverging lens
 the principal focus is ngative
 the principal focus is positive
 they form virtual, erect and smaller images of real object
 they poduce virtual images only

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Question 11 : Which of the following precautions is NOT applicable to experiment involving planoconvex lens?
 planoconvex lens should have small focal length
 the surface of the lens should be cleaned properly
 parallax error should be avoided
 the tip of the optical pin should be at the same level with the principal axis of the lens

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Question 12 : The advantage of potentiometer over voltmeter in measurements of emf is that
 the temperatue of the wire must remain constant
 the potentiometer wire is assumed to be uniform
 faults may arise due to breaks or wrong connections in the circuit
 it does not draw current from the circuit under test

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Question 13 : Which of these is not a useful precaution in an electrical experiment?
 readings should be recorded as soon as they are obtained
 the connections in the circuit should be tight
 key should be removed between readings to avoid battery run-down
 jockeys should be dragged on resistance wires

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Question 14 : In practical experiment inloving the use of optical pins, parallax is reduced or removed if on slightly displacing one's eye from side to side
 the object and image are coincident and move together in the same direction
 the object and image move in opposite directions relative to each other
 the object and image are not coincident but move together in same directions
 the object and image are coincident and remain stationary

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Question 15 : A glass prism of refracting angle 60 degrees gives a minimum deviation of 47degrees. What is the refractive index of the glass?
 1.52
 1.41
 1.20
 1.61

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Question 16 : In an experiment to determine the focal length of a convex lens, 1/u $\left(c{m}^{-1}\right)$ was plotted on horizontal and 1/v $\left(c{m}^{-1}\right)$ on the vertical axis, where u and v have their usual meaning. What is the physical significance of the reciprocal of the slope of the graph?
 image distance
 focal length
 linear magnification
 object distance

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Question 17 : Calculate the distance and magnification of an object placed 20cm from a converging lens
 80cm and 3 times the size of object
 20cm and 0.3 times the size of object
 60cm and 0.3 times the size of object
 60cm and 3 times the size of object

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Question 18 : In an experiment to determine the focal length of a convex lens, 1/u $\left(c{m}^{-1}\right)$ was plotted on horizontal and 1/v $\left(c{m}^{-1}\right)$ on the vertical axis, where u and v have their usual meaning. What is the physical significance of the reciprocal of the intercept on the horizontal axis?
 image distance
 focal length
 object distance
 linear magnification

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Question 19 : In an experiment with a concave mirror, the image of an optical pin which is 4 times its size was cast on on a screen 6m from the object pin. How far from the object pin should the mirror be placed?
 2m
 8m
 3m
 6m

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Question 20 : The null condition in potentiometer experiment shows that
 current is varying in the circuit
 potential differences are varying in the circuit
 potential difference are balanced
 the potential difference under test is zero