Recruitment Test for Physics -- Shahmeen Ameer

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Nov 24, 2024

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Name: Shahmeen Ameer Recruitment Test for Physics Objective 1. Area under velocity time graph represent DISPLACEMENT . A. Force B. Displacement C. Distance D. acceleration 2. Distance covered by a freely falling body in 2 seconds will be 19.6 m . (½)* (9.8)*(4) A. 4.9 m B. 19.6 ft C. 39.2 miles D. 19.6 m 3. An ordinary transistor is bipolar . A. bipolar B. tetrapolar C. tripolar D. none 4. We can construct exclusive -OR gate using which other gates? AND, NOT and OR A. AND, NOT and OR gate only B. AND and NAND gate only C. OR gate only D. all of these 5. The consumption of energy by a 60 watt bulb in 2 sec is 60*2= 120J A. 10 J B. 60 J C. 30 J D. 120 J 6. An electron enters a region where the electric field E is perpendicular to the magnetic field B. It will suffer no deflection if E= BeV/2 A. E = BeV B. B = eE/V C. E = BV D. E = BeV/2 7. The magnetic field strength of solenoid is________ A __________ A. B = μNI B. B = μN/I C. B = μnI

D. Both B and C 8. The roots of the equation 3x 2 – 12x + 10 = 0 are? Irrational and unequal A. rational and unequal B. complex C. real and equal D. irrational and unequal 9. Mr. Z makes an initial investment of $ 5,000 for three years. Find the value of the investment after the three years if the investment earns a return of 10 % compounded continuously. A. $ 6795 B. $ 6749 C. $12000 D. $500 10. What is domain of function f(x)= x 1/2 ? C A. (2, ∞) B. (-∞, 1) C. [0, ∞) D. None Numerical: 1. The 30 V battery source is in series with two resistors that are 30 ohms and 20 ohms respectively. What is the voltage drop across V1? 2. A kangaroo is capable of jumping to a height of 2.62 m. Determine the takeoff speed of the kangaroo. S= 2(9.8)(2.62)= 7.807m/s 3. Calculate the magnitude and direction of the resultant vector that is formed when taking the sum of two vectors shown below Vx=Vcos(theeta) Vy=Vsin(theeta) Magnitude = V= Vx+Vy = 500N Angle= inverse tan (Vy/Vx)=56.30

4. A gas is given 209 J of heat and Gas does the 20 J of work in the expansion resulting from heat given. Find the increase in the Kinetic energy of the gas in the process? 5. Find h’’(x) for the function h(x) = 5x -6 – 2x -7 6. Complete the truth table of the NAND gate with 2 inputs A B Output 0 0 1 0 1 1 1 0 1 1 1 0 7. Sketch the schematic diagram of a current source that will produce a constant output current IO = 20 µA using a reference current IREF = 1 mA. Include only the following components in the circuit: bipolar transistors, resistors, one supply voltage (V+ = +10 V), and ground. Assume that VT = 26 mV and that VBE (on) = 0.7 V at the reference current of 1 mA. Specify the value of every resistor in the circuit.

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DISCUSSION (Internet search is allowed only for this part) What is Electric field and where does it come from? Discuss the similarities between "Electric Field" and "Newton's Gravitation Field". What is the Van De Graff generator and how does it work? (350 words) Use only credible sources to gather material and provide references in APA style. Electric field is defined as the region across the electrically charged particle or an object in which the body experiences the charge. The electric field either attracts or repel the charges in the field. The electric fields are generated by the charges (Presman, 2013). There are two types of charges positive and negative. The similar charges attract each other and opposite charges repel each other (Fried & Boxer, 2015). According to the Newton’s Gravitational Field “Every object in the universe attracts every other object with a force that is directly related to the product of their masses and inversely proportional to the square of the distance between their centers (Barukčića, 2011). The origin of the gravitational field is the masses of the object (Rätzel et al., 2016). The similarities between both the laws are that they both follow the inverse square laws. They both also acts between two bodies (Daniel & Degree, 2019). Both electric field and Newton’s gravitational field are attractive however electric field is also repulsive. The gravitational field strength and electrical field strength both have a relation of 1/r^2 in a radial field. The Van De Graff generator is named after Dr. Robert J. Van De Graff who invented his electrostatic generator in 1935. He invented this generator to study the acceleration of charged particles for exploration of the atom (Furfari, 2005). Van De Graff generator is an electrostatic

generator which is capable of producing static electric potential. The generator is built for the purpose to demonstrate principles of electrostatic forces. Van De Graff generator can produce extremely high voltages due to the friction between the roller and the rubber belt which are made from different materials. These high voltages can only be observed at low currents due to their design. The lower roller begins turning the belt when the motor is turned on (Lee et al., 2017). The roller built a negative charge as the belt is made up of rubber and when induction takes place it will produce positive charge. This imbalance of charge is created because of the triboelectric effect. The generator will continue to make the charge until a potential difference between the grounded base and the sphere of the Van DE Graaff reach up to one-half of a million volts.

References Barukčića, I. (2011). The Equivalence of Time and Gravitational Field. Physics Procedia , 22 , 56–62. https://doi.org/10.1016/j.phpro.2011.11.008 Daniel, J., & Degree, D. (2019). THEORY OF FIELDS AND ENERGY . 6 . https://www.jetir.org/papers/JETIR1906S58.pdf Fried, S. D., & Boxer, S. G. (2015). Measuring Electric Fields and Noncovalent Interactions Using the Vibrational Stark Effect. Accounts of Chemical Research , 48 (4), 998–1006. https://doi.org/10.1021/ar500464j Furfari, F. A. (2005). A history of the Van de Graaff generator. IEEE Industry Applications Magazine , 11 (1), 10–14. https://doi.org/10.1109/mia.2005.1380320 Lee, S.-J., Castro, E. R., Guijt, R. M., Tarn, M. D., & Manz, A. (2017). Van de Graaff generator for capillary electrophoresis. Journal of Chromatography A , 1517 , 195–202. https://doi.org/10.1016/j.chroma.2017.08.026 Presman, A. (2013). Electromagnetic Fields and Life. In Google Books . Springer Science & Business Media. Rätzel, D., Wilkens, M., & Menzel, R. (2016). Gravitational properties of light—the gravitational field of a laser pulse. New Journal of Physics , 18 (2), 023009. https://doi.org/10.1088/1367-2630/18/2/023009

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