Physics Quiz

Chapter 1+2: Q.1 : vectors A and B represent at the shown in the figure . what is the angle is of their resultant R= A+B with respect to the positive x axis A .44.5 B .135.5 C.77 : D.99.4 E .112 Answer: D Q.2: consider the following equation X = At +Bt^4 where x distance and T time the unite A in (SI) is: A.m/s^3 B . m/s^2 C m/s^1 D.m/s Answer: D Q.3: A car is moving at constant velocity V . upon applying the break the car decelerate uniformly at stoping after moving distance D if the initial velocity is 2V the stoping distance become : A.2D B. 4D C. D E .6D Answer: B Q.4 a car moving along X axis direction such that its position as function of time is given by X =t^2 + t -2 where x in m and t in second the averge velocity in m/s of the car during the time t =1 to 3 seconds is : A.3 B0 C.10 E .5 Answer: D Q.5 man start from the origin and walk 20m along positive x axis he then turns around and move 12 m along the negative x axis if the time the whole trip is 6s then his averge speed is : A.5.3 B1.3 C.3.3 E.0 Answer: A Q.6 : The position of a particle moving along the x axis is given by x(t) = (21 m) + (22 m/s)t - (6.0 m/s2 )t2 , where t is in s. What is the average velocity during the time interval t = 1.0 s to t = 3.0 s? A) 6.0 B) -8.0 C) -2.0 D) 16.0 E) 8.0 Answer: C Q.7 : A man walks south at a speed of 2.00 m/s for 15.0 minutes. He then turns around and walks north a distance 1000 m in 15.0 minutes. What is the average speed of the man during his entire motion (in m/s)? A) 3.35 Answer: C B) 2.11 C) 1.56 D) 3.21 E) 2.82 Q.8 A car starting from rest travels a distance of 20.0 m with an acceleration of 2.0 m/s. The car then slows to a stop uniformly in 5.00 seconds. The distance traveled by th car during the whole time period (in m) is : A. 36.8 B.42.8 C .50.1 D.58.3 Answer: B Q.9 A ball is thrown vertically upwards with a speed of 12 m/s. If the ball starts at an initial height of 3.5 m, how long In (s) in the air : A 3.3 B. 6.6 C.1.5 D. 2.7 Answer: D Q.10 A car starts from the origin and drives 2.2 km south, then 3.1 km in a direction 53° north of east. What is the car's final position relative to the origin? A.1.9KM East B. 1.9 KM east and 1.3 north C .1.9 km east and 0.3 north D . 5KM north Answer: C Q.11 Vectors A and B are represented as shown in the figure. What is the angle of their resultant with respect to the positive x-axis ? A.-77 B.103 C .283 D.98 Answer D Q.12 : Car moving along straight road changes its velocity from 40m/s to 80m/s in distance 200 m what acceleration of the car during this time : A. 8m/s^2 B .9.6 m/s^2 C.12 m/s^2 D.6.9m/s^2 Answer: C Q.15 : car travels 42 Km in 45 min on straight line what is the average velocity in Km/h A.64 Answer:D B.40 C.48 D.56 Q.16: In period 4 hours man walks 6 Km east and 6 Km west what average speed? A.3.5K/h B. 4km/h C.3 km/h D.2.5km/h Answer: C Q.17: ball is thrown vertically up with initial velocity 10m/s what is the maximum height? A. 1.8M B. 1.2M C.7.2M D. 5 M Answer :D Q.18: ball is dropped and reach the ground after 3s what is the velocity gust before it touch the ground? A. 40m/s B.30m/s C .20m/s D.10m/s Answer: B Q.19:ball is thrown vertically upward from high building with initial velocity 12m/s what is the velocity after 4s ? A.75m/s B 30m/s C.-28m/s D.-38m/s Answer: D Q.20:ball was thrown vertically upward from windows 100m high with speed m/s what the total flight time ??? A.6.2s Answer: A B.4s C.10s D.5.6s Chapter 3+4 Q.1: A stone is thrown vertically upwards. Ignoring air resistance, which of the following statements is correct? a) The sum of the kinetic and potential energies is zero b) As the stone rises the potential energy decreases. c) As the stone descends the kinetic energy decreases d) The total mechanical energy is conserved. answer :D Q.2: A stone is thrown vertically upwards reaches a highest point and returns to the ground. When the stone is at the top of its path, its acceleration? A) changes direction from upwards to downwards B) is zero C) is directed upwards. D) is directed downwards Answer:D Q.3: A stone is thrown vertically upward with a speed of 18 m/s from the edge of a cliff 60 m high. The time in s) it takes the stone to reach the bottom of the cliff is: A) 2.1 B) 28.4 C) 18.2 D) 5.8 Answer :D Q.4: ball is released from rest from top building .How much distance has the ball moved in the time in interval from t=2 to t=3 ? a.45m answer: d b. 5m c.20m d. 25m Q.5: ball is thrown horizontally from the top 80m high building the ball strikes the ground at point 40m from base building what initial velocity of the ball ? a. 10m/s b. 20m/s c.56m/s d.50m/s answer: a Q.6: stone thrown from top building with initial velocity 30m/s at angle 53 dgree above horizontal what magnitude of its velocity at maximum height? a.18m/s b. 20m/s c.30m/s d. 24m/s answer: d Q.7: A ball is thrown at an angle of 30 above the horizontal from the top of a tower with initial speed of 12m/s. The flight time is 5s. What is the height of the tower? A) 95 m B) 50 m C) 125 m D) 155 m Answer :D Q.8: An object is thrown directly upward from the top of a building 50m high with initial velocity of 45m/s. How long does it take to reach the ground? A) 1 s B) 2 s C) 10 s D) 20 s Answer: C Q.9: A stone is thrown vertically upward from the top of a building with an initial speed of 10m/s. The flight time is 5 s. What is the height of the building? A) 175m B) 75 m C) 50 m D) 251 m Answer: C Q.10: A ball is thrown straight upward from the ground and goes to its maximum height and returns to the ground. What is its maximum height if it takes 4 seconds to complete the whole trip? A) 33.75 m B) 11.25 m C) 20 m D) 5.6 m Answer: C Q.10: A ball is thrown horizontally from the top of 80-m high building. The ball strikes the ground at a point 40 m from the base of the building (along the x-axis). What is the initial velocity of the ball? A)10 m/s Answer: A B)20 m/s C)56 m/s D)50 m/s Q.11: A stone is thrown vertically upward with an initial velocity of 20 m/s from the roof of a 50-m high building. How long does it take the stone to come back to the point from which it was thrown (the level of the roof of the building)? A) 4 s B) 2 s C) 8 s D)12s Answer: A Q.12: An object is projected from the surface of the ground with an initial velocity of 50 m/s that makes an angle of 37° with the horizontal. Find the time it takes the object to reach the ground? A) 3 s B) 2 s C) 4 s D) 6 s Answer: D Q.13: A ball is thrown upward from the ground level with an initial velocity of 12 m/s.What is the total flying time of the ball? A) 4.8 s B) 4.0 s C) 3.2 s D) 2.4 s Answer :D Q.14: A ball was thrown downward from a window with speed of 10m/s and it hit the ground with speed of 25m/s. what is the height of the window? A) 75m B) 56 m C) 40 m D) 26 m Answer: C Q.15: A stone is thrown from the top of cliff as an angle of 37° from the horizontal as shown in the figure. The cliff is 100m the ground and the stone hits the ground distances of 200m measured horizontally from the cliff. If the total time of flight stone is 3.95s, what is the maximum attitude (H max) reached by the stone? A) 150m B) 22.5m C)120 m D)122.5 m Answer:D Q.16: A skier slides down a 30° inclineditial velocity of 6 m/s and slides down the hill a distance of 20 m. If the coefficient of kinetic friction between the ice and his skies is 0.15, determine his speed (in m/s) at the bottom of the hill: a.15.7 Answer: c b.17.8 c.13.5 d.22 Q.17: A box of mass M = 50 kg is suspended by two massless cables as shown below. Find the tension in the cable on the left. a.740 b. zero c 140 d.346 Answer: d . Q.18: Two blocks are connected by a massless string which runs over a massless pulley as shown in the figure. The coefficient of kinetic friction between the mass mi and the horizontal surface is mk= 0.40 and mı = 3.0 kg, m2 = 9.0 kg. The acceleration of the system in m/s2) is M1 a.6.4 b.32 c. 9.8 d.4.9 Answer: a M2 Q.19: Two blocks of mass mi = 3.0 kg and mass m2 = 14 kg are sitting on the floor of a container as shown. If the container is accelerating downward at 3.5 m/s2, the magnitude of the force of block 1 on block 2 (in N) is a.19 b. 29 c .49 d.35 Answer: a M1 M2 Q.20: In the figure shown, the coefficient of static friction between the mass M and the vertical wall is u = 0.20. Given that M = 4.0 kg, determine the minimum value of the hos M stationary a.196 Answer:196 b.200 c.47 d.98 Q.21: A force F of 50 N is applied to a box of mass 5 kg moving on the floor as shown in the diagram. How much work (in J) is done by this force as the object moves 60 m? a.2585 b.2598 c.3000 d.1500 Answer: b Q.22: An object of mass 4 kg slides down a rough 30° inclined plane at constant velocity. The value of the coefficient of kinetic friction Mi between the block and the inclined plane is: a. 0 b.0.85 c.0.58 d.0.5 Answer: c Q.23: A skier starts with an initial speed vo = 10 m/s at the bottom of a rough steady upward 30° inclined plane as shown. The skier travels a distance of 6 m along the plane before coming to rest. The value of the coefficient of kinetic friction is: a.0.4 b.0.58 c.0.7 0.91 Answer: a Q.23: A skier slides down a 30° inclineditial velocity of 6 m/s and slides down the hill a distanceof 20 m. If of kinetic friction betw the coefficient een the ice and his skies is 0.15, determine his speed (in m/s) at the bottom of the hill .: a.13.5 Answer: a b.15.7 c.12.6 d.20 Chapter 6: Q.1: A rubber band is stretched by 1.0 cm when a force of 0.35 N is applied to each end. If instead a force a force of 0.70 N is applied to each end, estimate how far the rubber band will stretch from its un-stretched length? a.0.5cm b.0.25cm c.2cm d.1cm answer: c Q.2: A 5 kg block is set into motion with initial speed vi = 10m/s from the bottom of the inclined plane. The block comes to rest after traveling 3m along the inclined plane which is inclined at = 53° to the horizontal. Determine the change in the mechanical energy of the block? a.-83j b.-40j c.-130j d.-183j answer: c ‫ىالةىال‬ ‫ل‬34335 ‫لىت‬of Q.3: What is the spring constant of human femur under compression average cross section 10-3 m2 and length 0.2 m? Young’s Modulus of human bone is 9 × 109 N/m2 a. 4.5 × 107 N/m b. 2.25 × 107 N/m c. 3.25 × 107N/m d. 1 × 107 N/m Answer: a Q.4: Calculate the work done on a 1500-kg elevator car by its cable to lift it 40.0 m at constant speed, assuming friction averages 100 N: a.40000 j answer: b b.592000 j c.560000j d.4500000 Q.5: Calculate the work done by an 85.0-kg man who pushes a crate 4.00 m up along a ramp that makes an angle of 20.0º20.0º with the horizontal. (See Figure.) He exerts a force of 500 N on the crate parallel to the ramp and moves at a constant speed. Be certain to include the work he does on the crate and on his body to get up the ram? a.3140j c.7800j b.4000j d.1256j answer: a Q.6: A 60.0-kg skier with an initial speed of 12.0 m/s coasts up a 2.50-mhigh rise as shown in Figure. What her final speed at the top, given that the coefficient of friction between her skis and the snow is 0.0800? a.9.46m/s b.6.6m/s c.12m/s d.7.6m/s answer: a Q.7: What force must be supplied by an elevator cable to produce an acceleration of 0.800m/s20.800m/s2 against a 200-N frictional force, if the mass of the loaded elevator is 1500 kg? a.16100N b.12230N c .10200N d.7000N answer: a Q.8: What is the average useful power output of a person who does 6.00×106J6.00×106J of useful work in 8.00 h? a.208W answer: a b.220W c.77W d.400W Q.9: How long will it take an 850-kg car with a useful power output of 40.0 hp (1 hp = 746 W) to reach a speed of 15.0 m/s, neglecting friction? a.2.2s b.3.2s c.4s d.5.3s answer: b Q.10: What is the average useful power output of a person who does 6.00×106J6.00×106J of useful work in 8.00 h? a.200W answer: d b.460W c.500W d .208W Chapter 10: *Note ( g = 9.8m/s2) Q1: A blood vessel of radius r splits into three vessels, each of radius r/4. If the velocity in the larger vessel is v, then the velocity in each of smaller vessels is: a) 3 v/16 b) v/3 c) 9 v/4 d) 16 v/3 e) v Answer: d Q2: A 60-kg man just floats in water with all of his body below the water surface. What is his volume (in m3)? a) 1.2 b) 0.08 c) 0.06 d) 0.6 e) 1.0 Answer: c Q3: A 6.0 cm radius horizontal pipe gradually narrows down to 5.0 cm. If P1 = 30 kPa and v2 = 6 m/s, then the value of the pressure P2 (in kPa) is: V1 V2 a) 39.3 b) 63.5 c) 20.7 d) 209.6 e) 24.2 Answer: c V1 Water Flow V2 P1 Q4: The object of density ρ is placed in a fluid of density ρF. Which of the following statements is correct? a) The buoyant force depends on the density of the object. b) The buoyant force is due to the increase in the fluid pressure with depth below the fluid surface. c) If ρF < ρ, the object sinks. d) If ρF > ρ, the object floats. Answer: b Q5: Two balls of the same radius but densities ρ1 = 2 ρL and ρ2 = 4 ρL are placed in a liquid of density ρL. What is the ratio (the weight of ball 1 in the liquid / the weight of ball 2 in the liquid)? a) 2/3 Answer: e b) 1/2 c) 3/4 d) 4/3 e) 1/3 P2 Q6: A balloon is filled with 100 m3 of helium gas (ρHe = 0.179 kg/m3, ρair = 1.29 kg/m3). The weight (in N) of a load that can be lifted using this balloon is: (ignore the mass of the skin of the balloon and the buoyant force on the load). a) 1089 b) 11 c) 111 d) 1880 e) 1000 Answer: a Q7: A small boat is 4m wide and 6m long. When a load is placed on the boat, the boat sinks an additional 4 cm in the river water. What is the weight (in N) of load? (density of sea water is 1025 kg/m3) a) 24600 b) 9643 c) 1025 d) 24108 e) 940 Answer: b Q8: The cross-sectional area of the aorta is 2 cm2 and blood flows through it at 40 cm/s. The mass flow rate (in grams/s) of blood through the aorta is: (Assume density of blood to be 1059 kg/m3) a) 0.1 b) 100 c) 84.7 d) 8470 e) 1059 Answer: c Q9: Water flows into the top floor of a 16 m high building through a pipe of constant 2 cm diameter. At the base of the building (ground level) the water flows into the pipe at a speed 60 cm/s where the gauge pressure is 3.2 atm. The gauge pressure (in atm) in the pipe in the top floor is: a) 0 b) 1.54 Answer: d c) 2.65 d) 1.65 e) 3.2 Q10: When a man stand, his brain is 0.5 m above his heart. If he bends so that his brain is 0.4 m below his heart, by how much does the blood pressure in his brain change? (Assume density of blood is 1059.5 kg/m3). a) 13.3 kPa b) 4.0 kPa c) 13.1 kPa d) 9.3 kPa e) 16.6 KPa Answer: d ‫يي‬ Note: R=8.314 J/(mol.K) Chapter 13: Q1: The linear expansion coefficient for Al is α= 25×10-6C-1. What is the increase in volume of a block of 1 m3 of Al if the temperature of the block is raised by 10 ˚C? (ẞ=3α) a) 250 cm3 b) 500 cm3 c) 25 cm3 d) 750 cm3 e) 75 cm3 Answer: d Q2: One mole of an ideal gas has a temperature of 25˚C. If the volume is held constant and the pressure is doubled, the final temperature (in K) will be: a) 174 b) 323 c) 50 d) 596 e) 25 Answer: b Q3: The temperature of an object is 80 ˚F. What is its absolute temperature on the Kelvin scale? a) 300 K b) 335 K c) 359 K d) 475 K e) 400 K Answer: a Q4: Two cylindrical metal rods of 1 meter in length, one aluminum and one iron, are heated from 20˚C to 80˚C. Given the coefficient of linear expansion for aluminum rod 25×10-6 C-1 and iron rod 12×10-6 C-1 respectively, what is the difference in length of the two metal rods after heating (in mm)? a) 0.078 Answer: b b) 0.78 c) 0.68 d) 0.12 e) 0.5 Q5: Suppose that a gas originally at standard temperature and pressure undergoes a change in which its pressure is quadrupled while its temperature is cut in half. What change in volume does the gas experience during this process? a) Increase by a factor of 2 b) Decrease by a factor of 8 c) Decrease by a factor of 2 d) The volume of gas will not change e) Increase by a factor of 8 Answer: b Q6: What is the volume of 1kg of at 24∘C and .98atm?(M.W of N = 14) a) 888L b) 80.4L c) 951L nitrogen gas (diatomic) d) 40.4L Answer: a Q7: An automobile tire is filled to a gauge pressure of 210 kPa at 10˚C. After a drive of 100 km, the temperature within the tire rises to 40˚C. What is the pressure within the tire now? (Atmospheric pressure = 101 kPa) (Assume the volume of gas is constant). a) 232.3 kPa b) 344 kPa c) 135.5 kPa d) 415 kPa Answer: b Q8: What is the pressure inside a 38.0 L container holding 105 kg of argon gas at 25˚C? (M.W of argon = 40). a) 1.71×105Pa b) 5.5×108Pa c) 1.71×108Pa d) 5.5×105Pa Answer: c Q9: A ball made and filled with iron, with a diameter of 40 cm, at room temperature (20 ° C) the temperature is raised to 30 ° C. How much volume has been increased? (The volume expansion coefficient for iron is ẞ=35×10-6 C-1). a) 1.17×10-5 L b) 1.17L c) 4.3L e) 5.5×10-3L Answer: a Q10: 18˚ below zero on the Celsius scale is what Fahrenheit temperature? a) -10 Answer: d b) 5.5 c) -1.5 d) -0.4 Chapter 16 Note: k= 9×109N.m2/C2 Q1: Three charges, Q1, Q2, and Q3 are located in a straight line. The position of Q2 is 0.268 m to the right of Q1. Q3 is located 0.158 m to the right of Q2. The total force on Q2 is? (Q1= 2.07×10-6 C, Q2= -2.84×10-6 C, Q3= 3.18×10-6 C). a) 5.5 N, to the left. b) 2.5 N, to the left. c) 5.5 N, to the right. d) 2.5 N, to the right. Answer: d Q2: Two point charges, QA = +8 μC and QB = -5 μC, are separated by a distance r = 10 cm. What is the magnitude of the electric force? a) 4×10-9 N b) 40 N c) 36 N d) 3.6×10-4 N Answer: c Q3: What is the magnitude and direction of the electric force at charge B? (Charge A (qA) =+Q , Charge B (qB) = -2Q, Charge C (qC) = -Q) (The distance between charge A and B (rAB) = r, the distance between charge B and C (rBC) = 2r). A B r a) 2.5 kQ2r-2, rightward b) 1.5 kQ2r-2, rightward c) 2.5 kQ2r-2, leftward d) 1.5 kQ2r-2, leftward Answer: C C 2r Q4: Three charges QA, QB, and QC as shown in the figure below. The length of AB = the length of BC = 30 cm. (QA= +3×10-6 C, QB= -10×10-6C, QC= +4×10-6 C). What is the magnitude and direction of the electric force at charge B? A B C a) 5N, ɵ=36.87˚ with negative x-axis b) 5N, ɵ=53.13˚ with positive y-axis c) 5N, ɵ=36.87˚ with positive y-axis d) 5N, ɵ=53.13˚ with positive x-axis Answer: b Q5: Two charges, 5 C and 15 C are separated by some distance. Force between them is 6.75x1013 N. What is the distance between them in cm? a) 15 b) 10 c) 20 d) 5 Answer: b Q6: Two point charges, q₁= +20.0 nC and q₂= +10.0 nC, are located on the x-axis at x= 0 and x=1.00 m, respectively. Where on the x-axis is the electric field will be zero? a) 0.585 m from +20 nC b) 0.585 m from +10 nC c) 0.763 m from +20 nC d) 0.763 m from +10 nC Answer: a Q7: -10 Nc charge is located at (0,0) point. The y component of electric field at point P (4cm, 5cm) is? a) -1.7157 N/C b) 1.7157 N/C c) 17157.72 N/C d) -17157.72 N/C Answer: d Q8: What is the magnitude of positive and negative charges ? _ + a) Positive and negative charges are equal b) Positive charge is twice that negative charge c) Negative charge is twice that positive charge d) The negative charge is four times smaller than the positive charge Answer: b Q9: Three point charges are placed on the x-axis. A charge of 3.00 µC is at the origin. A charge of -5.00 µC is at 20.0 cm, and a charge of 8.00 µC is at 35.0 cm. What is the electric field on the charge at the origin? a) 64.43×105 N/C, rightward b) 64.43×105 N/C, leftward c) 76.19×105 N/C, rightward d) 76.19×105 N/C, leftward Answer: a Q10: In the last question, if an electron (mass=9.11×10-31 kg) is placed at rest at the origin and then released, what will its initial acceleration (direction and magnitude)? (Q of electron=1.6×10-19 C) a) 1.1×1017 m/s2, leftward b) 11.32×1017 m/s2, leftward c) 1.1×1017 m/s2, rightward d) 11.32×1017 m/s2, rightward Answer: b Chapter 23: Q1: A concave mirror has a radius of curvature of 20.0 cm. An object, 2.0 cm high, is placed 30.0 cm from the mirror. How high is the image, and what is it located? a) hi = 1.0 cm, di = -30.0 cm b) hi = 2.0 cm, di = 15.0 cm c) hi = -2.0 cm, di = -30.0 cm d) hi = -1.0 cm, di = 15.0 cm Answer: d Q2: An object, 2.0 cm high, is placed 5.0 cm in front of a concave mirror with a focal length of 10.0 cm. How large is the image, and where is it located? a) hi = 4 cm, di = 10 cm b) hi = -4 cm, di = 10 cm c) hi = 4 cm, di = -10 cm d) hi = -4 cm, di = -10 cm Answer: c Q3: A convex security mirror in a warehouse has a radius of curvature of 1.0 m. A 2.0 m high forklift is 5.0 m from the mirror. What is the location and size of the image? a) hi = 0.18 m, di = -0.45 m b) hi = -0.18 m, di = 0.45 m c) hi = 5.5 m, di = -0.56 m d) hi = -5.5 m, di = 0.56 m Answer: a Q4: One of the following is wrong about the flat mirror imagination: a) The image distance equals the object distance b) The line connection the body and its image is perpendicular to the surface of the mirror c) Real image d) Imagination is sideways reversed Answer: c Q5: What is the angle of refraction in a medium if the angle of incidence in air is 48˚ and the index of refraction of the medium is 1.58? (The indices of refraction for air is 1.00) a) 35˚ b) 60˚ c) 28˚ d) 54˚ e) 11˚ Answer: c Q6: Suppose you are standing 1 m in front of a plane mirror. What should be the minimum vertical size of the mirror so that you can see your full image in it? a) 0.50 m b) 2 m c) Half of your highest d) Twice of your highest Answer: c Q7: What kind of image is created by a concave lens? a) Upright and smaller b) Inverted and smaller c) Inverted and larger d) Upright and smaller Answer: a Q8: An optician prescribes a power = - 0.5 dioptre. The corresponding lens must be a: a) Convex lens of focal length 2 m b) Convex lens of focal length 50 cm c) Concave lens of focal length 2 m d) Concave lens of focal length 50 cm Answer: c Q9: An object is placed 32.0 cm from a convex lens that has a focal length of 8.0 cm. If the object is 3.0 cm high, how high is the image? a) 1.0 cm b) -1.0 cm c) 3.5 cm d) -3.5 cm Answer: b Q10: Light travels from air into water. If the angle of refraction is 30˚, what is the angle of incidence? )The indices of refraction for air is 1.00, and for water is 1.33) a) 85˚ Answer: d b) 23˚ c) 16˚ d) 42˚