## NOUN TMA Solutions: PHY192 - Introductory Physics Practical II

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### NOUN TMA Solutions: PHY192 - Introductory Physics Practical II

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Q1 In the circuit shown, what is the current flowing through the battery?

2.6A

Q2 In the circuit shown, what is the equivalent resistance in the circuit?

4.7$\Omega$

Q3 A ray of light travels from air to glass. The incident ray makes an angle of 45 degrees while the refracted ray makes and angle of 30 degrees with the normal to the interface. The speed of light in air is $3.0\times10^{8}$m/s. What is the of speed of light in glass?

$2.12\times10^{8}$m/s

Q4 The physical principle which accounts for the travelling of sound through longer distances at night is called-----------

refraction

Q5 Images formed by plane mirrors are -------------

laterally inverted

Q6 The ------------ of the eye plays an equivalent role of the screen in optical experiments

retina

Q7 The physical phenomenon which accounts for apparent depth of a pool of water is called

refraction
Q8 Beyond the critical angle, a ray of light moving from dense to rare medium suffers ------

total interna l reflection

Q9 A Wheatstone bridge ABCD (labelled in clockwise direction) with a galvanometer G joined to the junctions B and D. A cell E is connected across AC. Resistances of 15, 10, 4 and X ohms are inserted into the arms AB, BC, CD and DA respectively. The value of X is ------- ohms

2.67

Q10 A current of 0.5A flowing through a wire produces 21J of heat in 1/2 min. The resistance of the wire is ----------- ohms to 1 place of decimal

2.8$\Omega$

Q11 In an experiment to determine the relationship between the current I through a piece of tungsten wire and the potential difference V across it, the theoretical relationship used was $I = kV^{n}$ , where k and n are constants which may be obtianed from a straight line graph of the form y = mx + c, the symbols having their usual meaning. The corresponding linear equation for this experiment is ----------

logI = nlogV + logk

Q12 Two resistances $2\Omega$ and $3Omega$ are in parallel. The combination is in series with $1.5\Omega resistance and a power supply of voltage V. There is a current of 3A through the$2\Omega4 resistane. What are the values of the current I delivered by, and the voltage V across the power supply?

4A and 12V

Q13 Two wires P ad Q, each of the same length and same material, are connected in parallel to a battery. The diameter of P is half that of Q. What fraction of the total current passes through P?

0.20

Q14 In an experiment with a potentiometer, the balanced length of 30cm was recorded when a standard cell (Daniel cell) of electromotive force $E_{1} = 1.1V$ was introduced in the circuit. The standard cell was then replaced by a Leclanche cell and the balance length recorded was 40cm. The electromotive force $E_{2}$ of the Leclanche cell is ---------------- to 1 place of decimal

1.4V

Q15 constant 60V d.c. supply is connected across two resistors of resistances $400 k\Omega$ and $200 k\Omega$. What is the reading of of the voltmeter, also of resistance $200 k\Omega$ when connected across the $200 k\Omega$ resistor?

12V

Q16 A battery of emf E and negligible internal resistance is connected to two resistances $R_{1}$ and $R_{2}$ in series. What the potential difference across $R_{2}$?

$\frac{E R_{2}}{R_{1} + R_{2}}$

Q17 An electrical source with internal resistance r is used to operate a lamp of resistance R. What fraction of the total power is delivered to the lamp?

$\frac{R}{R + r}$

Q18 What is the reading of the voltmeter

betw een zero and 3 V

Q19 What is the current flowing through the voltmeter?

$\frac{2}{R}$A

Q20 In the circuit shown, resistors X and Y, each of resistance R, are connected to a 6V battery of negligible internal resistance. A voltmeter, also of resistance R is connected across Y. What is the current flowing through X?

$\frac{4}{R}$A

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### Re: NOUN TMA Solutions: PHY192 - Introductory Physics Practical II

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Q41 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? 995\Omega Q42 In the circuit diagram shown, the device marked X is a ----------------- galvan ometer Q43 The null condition in potentiometer experiment shows that potential difference are balanced Q44 The potentiometer wire plays equivalent role of which of these devices in a circuit? rheostat Q45 The advantage of potentiometer over voltmeter in measurements of emf is that it does not draw current from the circuit under te st Q46 Which of these is not a useful precaution in an electrical experiment? jockeys should be dragged on resistance wires Q47 Which of the following is NOT true about a rheostat? It is a constant current instrument Q48 In an experiment, potential difference is plotted on the vertical axis and current on the horizontal axis. The slope of the graph represents resistance Q49 For a metallic conductor, Ohm's law holds provided temperature remains con stant Q50 The lens of the human eye is convergi ng Q51 Which of the following precautions is NOT applicable to experiment involving planoconvex lens? planoconvex lens should have small focal length Q52 A glass prism of refracting angle 60 degrees gives a minimum deviation of 47degrees. What is the refractive index of the glass? 1.61 Q53 Calculate the distance and magnification of an object placed 20cm from a converging lens 80cm and 3 times the size of object Q54 Diopter measures inverse of obj ect distance from lens Q55 Which of the following is not true about diverging lens the principal focus is ngative Q56 In an experiment to determine the focal length of a convex lens, 1/u (cm^{-1}) was plotted on horizontal and 1/v (cm^{-1}) 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? object distan ce Q57 In an experiment to determine the focal length of a convex lens, 1/u (cm^{-1}) was plotted on horizontal and 1/v (cm^{-1}) 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? linear magnification Q58 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 dire ction Q59 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 Q60 The image of an object which is between the concave mirror's reflecting surface and its principal focus is behind the mirror erect virtual and enlarged Solutions2tma@gmail.com Whatsapp: 08155572788 Stay informed when you download our app https://play.google.com/store/apps/deta ... m.nounites Adele Posts: 507 Joined: Mon Nov 06, 2017 3:24 pm Contact: ### Re: NOUN TMA Solutions: PHY192 - Introductory Physics Practical II Solutions2tma@gmail.com Whatsapp: 08155572788 Stay informed when you download our app https://play.google.com/store/apps/deta ... m.nounites Q61 diopter is the unit of power of lens Q62 In an experiment involving the convex lens images obtained must be magnified Q63 Describe the image of candle positioned 20cm in front of a concave mirror of focal length 30cm virtua,l erect, 60cm behind mirror and magnified 3 time Q64 Which of the following is correct about tracing ray digrams with curved mirrors rays parallel and close to the principal axis are reflected through th e pricipal focus Q65 Convex mirrors are mostly used as driving mirrors Q66 In an experiment involving a spherical mirror, 1/v was plotted on the vertical axis and 1/u on the horizontal axis. What is the linear magnification? inverse of the the s lope of the graph Q67 Which of the following is NOT true of experiments involving curved mirrors? image distance is negative for for real image Q68 In an expreiment, derived values such as those obtained from four figure tables should be recorded to at least ------- decimal places 3 Q69 Which of the following is NOT applicable when plotting the graph of experimntal data? the scale must be chosen to make the graph occ upy as small as possible of the graph page Q70 An estimate of the refractive index of glass is 1.5. If the angle of incidence is$$30^{o}$$the angle of refraction is$$19^{o} $$Q71 The critcal angle for total internal reflection at an air - water interface is approximately$$48^{o}$$. In which of the following situations will total internal reflection occur. light incident in water at$$55^{o}$$Q72 In experimental observations involving rectangular glass blocks, the angle of refraction is less than the angle of incidence when light is entering the block Q73 Which of the following is NOT a precaution in optical experiments that involve glass blocks? Optical pins must cluster together Q74 When refraction occurs which of the following remains unchanged? frequecy Q75 From the graph, what is the critical angle for glass - air interface?$$42^{o}$$Q76 From the graph, what is the critical angle for water - air interface?$$48^{o}$$Q77 Light in glass is incident at the surface with air at an angle of$$30^{o}$$. From the graph, at what angle is it refracted?$$56^{o}$$Q78 Light in water is incident at the surface with air at an angle of$$30^{o}$$. From the graph, at what angle is it refracted?$$42^{o}$$Q79 According to the graph, at what angle is light refracted if it strikes the surface of glass at an angle of$$30^{o}$$?$$17^{o} $$Q80 According to the graph, at what angle is light refracted if it strikes the surface of water at an angle of$$30^{o}$$?$$24^{o}$$Solutions2tma@gmail.com Whatsapp: 08155572788 Stay informed when you download our app https://play.google.com/store/apps/deta ... m.nounites Adele Posts: 507 Joined: Mon Nov 06, 2017 3:24 pm Contact: ### Re: NOUN TMA Solutions: PHY192 - Introductory Physics Practical II Solutions2tma@gmail.com Whatsapp: 08155572788 Stay informed when you download our app https://play.google.com/store/apps/deta ... m.nounites Q21 The bending of a ray of light as it travels from one transparent medium to another is called -------- refraction Q22 In the construction of an ammeter, a low resistance called resistance------------ is connected in parallel to a suitable galvanometer shunt Q23 The unit of electrical energy expended per unit time is calledd --------- watt Q24 The name of the device which provides sliding contact with the potentiometer wire is called ----------- jockey Q25 The difference between the emf of a battery and the lost volts when discharging is called terminal voltage Q26 A device known as ---------- may be used for comparison of resistances Wheatstone bridge Q27 A device which may be used to compare the potential differences of electric cells is called ----------- potentio meter Q28 The term "lost volts" is used to describe ---------- of a cell energy dissipated in the inter nal resistance Q29 The time rate of flow of charge across a unit cross-sectional area of a conductor defines electric cirrent Q30 A 1m\Omega resistor is to be made from a 1-mm diameter wire of resistivity 2.8\time10{-8}.Find the length of the wire 2.8cm Q31 Which of the following is correct? Kirchoff's loop rule represents conservation of energy Q32 Two resistances of 2\Omega each are connected in parallel and then connected in series to a 1\Omega resistance. What is the equivalent resistance 2\Omega Q33 A slide-wire potentiometer is balanced against 1.0182V standard cell at slide contact of 40.2cm. For an unknown emf the slide contact is 11.9cm.What is the emf of the unknown cell? 0.30V Q34 The slide wire of the figure shown is balanced when the the uniform slide wire AB is divided as shown. The value of the resistance X is _________________$$\Omega$\$

2

Q35 The diagram shown is called a ________________

wheatstone bridge

Q36 The advantage of potentiometer over voltmeter in measurements of emf is that

it does not draw current from the circuit under te st

Q37 Which of these is not a useful precaution in an electrical experiment?

jockeys should be dragged on resistance wires

Q38 Which of the following is not true about a rheostat?

It is a constant current instrument

Q39 In an experiment, potential difference is plotted on the ordinate (vertical axis) and current on the abscissa(horizontal axis). The slope of the graph represents

resistance

Q40 For a metallic conductor, Ohm's law holds provded

temperature remains con stant

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