King Saud University College of Science Department of Physics and Astronomy Girls section Second Term (1435-36) PHYS145 Make-up to Second Midterm 10:00 - 11:30 a.m. Tuesday, May 19, 2015 Name: ID number: Section: Classroom: Write your selected answer for each question here: Q1 Q2 Q3 Q4 Q5 A C C D A Q6 Q7 Q8 Q9 Q10 B E A C B Q11 Q12 Q13 Q14 Q15 B A D E B 1) Please do not forget to write your name on this page 2) Separate this page for the 2 other pages 3) Return only this page at the end of the exam Assume g = 9.8 m/s2 in all questions. The density of water is ρ = 1000 kg m-3. The atmospheric pressure is Patm = 1.01 × 105 Pa PHYS145_MID II_MAKE-UP_GIRLS_ANS_SPRING 2015 1. A student is located 0.8 m from a plane mirror. How far is the image from the student? A) 1.6 m B) 0.9 m C) 0 m D) 2.7 m E) 3.6 m 2. A lens (n=1.5) has an inner radius of curvature (concave surface) of 2.5 cm and an outer radius of curvature (convex surface) of 2 cm. The focal length of the lens is: A) -10 cm B) 4.5 cm C) 20 cm D) 10 cm E) -17 cm 3. When the distance from a real object to a converging lens is greater than the focal length, the image formed is: A) Virtual and inverted B) Virtual, upright and reduced D) Virtual, upright and enlarged E) Real and upright C) Real and inverted 4. What is the current through resistor R1 in the circuit? Α) 0.2 A B) 0.02 A C) 0.4 A D) 0.1 A E) 0.04 A 5. A Copper wire has a cross-sectional area of 1mm2 and conductivity of 5.8 x 107 Ω-1 m-1. What length of this wire will have a resistance of 100 Ω? A) 5.8 km B) 4.8 km C) 3.7 km D) 6.4 km E) 10 km 6. The voltage across R3 is (A) 9 V (B) 4.5 V (C) 2.5 V (D) 3 V (E) 6 V 7. Each second, 5525 m3 of water flows over the 670-m-wide cliff of the Horseshoe Falls portion of Niagara Falls. The water is approximately 2 m deep as it reaches the cliff. What is its speed at that instant? A) 6 m/s B) 8 m/s C) 2 m/s D) 5 m/s E) 4 m/s 8. Water enters the basement of a building flowing through a pipe with a velocity 0.9 m/s at an absolute pressure of 3.03 × 105 Pa. A hose is used to water plants at a garden 10 m above the basement. Find the velocity of the water as it leaves the hose. A ) 14.44 m/s B) 12.36 m/s C) 17.82 m/s PHYS145_MID II_MAKE-UP_GIRLS_ANS_SPRING 2015 D) 23.63 m/s E) 8.24 m/s 9. Let v be the velocity of a fluid flowing in a horizontal cylindrical pipe with a radius of 2 cm. If the radius is reduced to 0.5 cm what will be the new velocity of flow? A) v/4 B) 4v C) 16v D) v/16 E) v/8 10. A 10 A current is maintained in a simple circuit with a total resistance of 200 Ω. The charge passing through any point in the circuit during one minute is: A) 200 C B) 600 C C) 500 C D) 400 C E) 1200 C 11.When two light bulbs are connected in series, the A) current through each light bulb is proportional to the resistance of the bulb. B)same amount of current always flows through each bulb. C) neither A nor B D) A and B are correct 12.An upright (erect) image is reduced to one-fourth of the object’s height when the object is placed 27 cm from a thin lens. The focal length of the lens is: A) - 9 cm . B) -7 cm C) 7 cm D) 9 cm E) 12 cm 13.A thin converging lens produces a real inverted image that is twice as large as the object and is located at 15 cm from the lens. What is the focal length of the lens? A) 0.5 cm B) 30 cm C) 15 cm D) 5 cm E) 1.5 cm 14.Instead of describing fluids in terms of masses and forces, we use the________ and the________ A) B) C) D) E) mass , pressure density , force velocity , acceleration displacement , acceleration density , pressure 15. How high can water rise in the pipes of a building if the pressure at the ground floor is 2 × 105 Pa? A) 30.5 m B) 20.4 m C) 25.8 m PHYS145_MID II_MAKE-UP_GIRLS_ANS_SPRING 2015 D) 15.6 m E) 9.5 m