Physics 6

PHYSICS 1.

A ball is thrown vertically upward with an initial velocity of 3 m/s from a window of a tall bldg. The ball strikes the ground level 4 seconds later. Determine the height of window above the ground. a) 66.331 m. c) 67.239 m. b) 66.450 m. d) 67.492 m.

Solution: V22 = V12 – 2gh, V2 = V1 –gt1 Answer: S = 66.331m. (Ht of window) 2.

A stone was dropped freely from a balloon at a height of 190 m. above the ground. The balloon is moving upward at a speed of 30 m/s. Determine the velocity of the stone as it hits the ground. a) 69.03 m/s c) 67.30 m/s b) 68.03 m/s d) 69.23 m/s

Solution: V22 = V12 – 2gh,

V32 = V22 – 2g H

Answer: V3 = 68.03 m/s 3.

A ball is thrown vertically at a speed of 20 m/s from a bldg. 100 m. above the ground. Find the velocity and position of the stone above the ground after 5 seconds. a) 4.67 m, 48.30 m/s c) 5, 43 m, 47.69 m/s b) 4.54 m, 47.68 m/s d) 5.68 m, 48.20 m/s

Solution: V22 = V12 – 2gh,

V32 = V22 – 2g H

Answer: V3 = 47.68 m/s 4.

A ball is thrown vertically at a speed of 30 m/s from the top of a tower 200 m. Determine the velocity of the stone and the time that it strikes the ground. a) 11.50 sec, 65.80 m/s c) 10.30 sec, 67.21 m/s b) 11.45 sec, 66.59 m/s d) 10.14 sec, 69.45 m/s

Solution: V22 = V12 – 2gh,

V2 = V1 –gt1

Answer: V3= 69.45 m/s 5.

A ball is thrown vertically with a velocity of 20 m/s. from the top of a bldg. 100 m. high. Find the velocity of the stone at a height of 40 m. above the ground. a) 39.71 m/s c) 39.88 m/s b) 40.23 m/s d) 39.68 m/s

Solution: V22 = V12 – 2gh, Answer: V3 = 39.71 m/s

V32 = V22 – 2g H

6.

A projectile is fired from the top of a cliff 92 m. high with a velocity of 430 m/s directed 45º to the horizontal. Find the range on the horizontal plane through the base of the cliff. a) 18.959 km. c) 15.273 km. b) 23.408 km. d) .20.365 km.

Solution: Y=X tan 45º- ((gx2) / (2V02Cos2Ө)) Answer: x = 18.959 km. 7.

A stone is thrown outward, at an angle of 30º with the horizontal as shown in the drawing, into the river from a cliff that is 120 meters above the water level at a velocity of 36 kilometers per hour. At what height above the water level will the stone start to fall? a) 121.27 m. c) 111.38 m. b) 189.29m. d) 152.22 m.

Solution: Y=X tan Ө - ((gx2) / (2V02Cos2Ө)) Answer: 121.27m 8.

A stone was thrown upward at an angle of 60º with the horizontal and a resultant vertical speed of 100.0 meters per second. If gravity decelerates the speed at 9.8 meters/sec², what is the actual speed of the stone, in meters per second, 10.0 seconds later, in the direction it was thrown? a) 57.77 m/s c) 60.35 m/s b) 64.22 m/s d) 67.23 m/s

Solution: Tan Ө = Vy / Vx Answer: V = 57.77 m/sec. 9.

A projectile is launched at 45º to the horizontal on a level ground at a speed of 60 m/s. Neglecting air resistance, what is the range of the projectile? a) 366.86 m. c) 663.24 m. b) 355.29 m. d) 386.66 m..

Solution: Y=X tan Ө - ((gx2) / (2V02Cos2Ө)) Answer: R = 366.86 m. 10. A ball thrown at an angle of 30º with the horizontal from a point 60 m. from the edge of a vertical cliff 48 m. high. The ball just misses the edge of the cliff. Determine the initial velocity of the ball and the distance beyond the cliff where the ball strikes the ground. a) 28.4 m/sec; 32.6 m. c) 27.5 m/sec; 56.5m b) 26.1 m/sec; 46.9 m. d) 31.1m/sec; 43.2m Solution: Y=X tan Ө - ((gx2) / (2V02Cos2Ө)) Answer:

At point A, V = 26.1 m/sec (initial velocity of the ball) At point B, D = 46.9 m. (distance from the cliff to the point where the ball strikes the ground)

11. A block passes a point 4 m from the edge of a table with a velocity of 5 m/sec. It slides off the edge of the table which is 5 m. high and strikes the floor 3 m from the edge of the table. What was the coefficient of friction between the block and the table? a) 0.65 c) 0.21. b) 1.04. d) 0.11 Solution: Y= ½ (gt 2),

V22 = V12 – 2as,

F=Wa/g

Answer: µ= 0.21 12. A ball is shot at a ground level at an angle of 60 degrees with the horizontal with an initial velocity of 10 m/sec. Which of the following most nearly gives the maximum height (h) attained by the ball? a) 2.47 m c) 4.61 m b) 3.29 m d) 3.82 m Solution: V2 = V02 – 2g H Answer: h = 3.82 m. 13. A stone is thrown upward at an angle of 30º with the horizontal. It lands 60 m. measured horizontally and 2 m. below measured vertically from its point of release. Determine the initial velocity of the stone in m/s. a) 27.35 c) 25.35 b) 28.35 d) 26.35 Solution: Y=X tan Ө - ((gx2) / (2V02Cos2Ө)) Answer: V = 25.35 m/s. 14. A projectile is fired with a muzzle velocity of 300 m/s from a gun aimed upward at an angle of 20º with the horizontal, from the top of a building 30 m. high above a level ground. With what velocity will it hit the ground in m/s? a) 300.98 c) 320.96 b) 310.96 d) 330.96 Solution: V2 = V1 –gt1,

H= ½ (gt2 2)

Answer: V3 = 300.98 m/s 15. A projectile leaves a velocity of reach? a) 31.86 b) 41.26 Solution: V22 = V12 – 2gh Answer:

h = 31.86

50 m/s at an angle of 30 with the horizontal. Find the maximum height that it could c) 28.46 d) 51.26

16. A ball is shot at a ground level at angle of 60 degrees with the horizontal with an initial velocity of 100 m/s. Determine the height of the ball after 2 sec. a) 162.46 m. c) 175.48 m. b) 153.59 m. d) 186.42 m. Solution: Y=X tan Ө - ((gx2) / (2V02Cos2Ө)) Answer: y = 153.59 m. 17. A ball is shot at an average speed of 200 m/s at an angle of 20º with the horizontal. What would be the velocity of the ball after 8 sec.? a) 188.21m/s c) 215.53 m/s b) 154.34m/s d) 198.37 m/s Solution: X=VCos20ºt,

Y=X tan Ө - ((gx2) / (2V02Cos2Ө))

Answer: V = 366.86 m. 18. A projectile has a velocity of 200 m/s acting at an angle of 20º with the horizontal. How long will it take for the projectile to hit the ground surface? a) 13.95 sec. c) 10.11 sec b) 15.75 sec. d) 24.23sec. Solution: Y=X tan Ө - ((gx2) / (2V02Cos2Ө)) Answer: t = 13.95 sec. 19. A stone is thrown upward at an angle of 20º with the horizontal from the top of a tower 30 m. high and hits the ground at a distance of 5976.4 m. horizontally from the base of the tower. Find the time of flight of the stone until it hits the ground. a) 21.20 sec. c) 19.39 sec. b) 22.20 sec d) 24.15 sec. Solution: Y=X tan Ө - ((gx2) / (2V02Cos2Ө)) Answer: t = 21.20 sec. 20. A projectile is fired upward at an angle of 20º with the horizontal from the top of a tower 30 m. high above a level ground. Find the range on the horizontal plane will the ball hit the ground after 20.20seconds. a) 5386.30 m. c) 5415.37 m. b) 5642.22 m. d) 6329.33 m. Solution: X=VCos20ºt, Answer: x = 5415.37 m.

Y=X tan Ө - ((gx2) / (2V02Cos2Ө))

21. A projectile leaves a velocity of 50 m/s at an angle of 30º with the horizontal. Find the time it would take for the projectile to reach the maximum height. a) 2.55 sec. c) 3.10 sec. b) 2.60 sec. d) 2.89 sec. Solution: V22 = V12 – 2gh,

V2 = V1 –gt

Answer: t = 2.55 sec. 22. A baseball is thrown from a horizontal plane following a parabolic path with an initial velocity of 100 m/s at an angle of 30º above the horizontal. How far from the throwing point will the ball attain its original level? a) 890 m. c) 883 m. b) 884 m. d) 875 m. Solution: R= (V2Sin Ө)/g Answer: R = 882.8 m. 23. A shot is fired at an angle of 45ºwith the horizontal and a velocity of 300 fps. Calculate, to the nearest, the range of the projectile. a) 3500 ft. c) 4000 ft. b) 1200 ft. d) 934 yds. Solution: R= (V2Sin Ө)/g Answer: R = 934 yds. 24. Three crates with masses A = 45.2 kg, B = 22.8 kg and C = 34.3 kg and are placed with B along a horizontal frictionless surface. Find the force exerted by B and C by pushing the crates to the right with an acceleration of 1.32 m/sec². a) 45.3 kN c) 43.2kN b) 54.2 KN d) 38.7kN Solution: F = ma Answer: F = 45.3kN 25. Three blocks A, B and C are placed on a horizontal frictionless surface and are connected by chords between A, B and C. determine the tension between block B and C when a horizontal tensile force is applied at C equal to 6.5 N. Masses of the blocks are A = 1.2 kg, B = 2.4 kg and C = 3.1 kg. a) 3.50 N c) 3.89 N b) 4.21 N d) 4.65 N Solution: F = ma; T = ma Answer: T = 3.50 N

26. A constant force P = 750 N acts on the body shown during only the first 6 m. of its motion starting from rest. If u = 0.20, find the velocity of the body after it has moved a total distance of 9m. a) 3.93 m/sec² c) 2.32 m/sec² b) 4.73 m/sec² d) 3.11 m/sec² Solution: ∑positive work-∑negative work = ½ (W/g)(V22-V12) Answer: V2 = 3.93m/sec² 27. A weight of 9 kN is initially suspended on a 150 m. long cable. The cable weighs 0.002 kN/m. If the weight is then raised 100 m. How much work is done in Joules? a) 915000 c) 951000 b) 938700 d) 905100 Solution: W=Fd Answer: 915000 Joules 28. What is the kinetic energy of a 4000 lb. automobile which is moving at 44 fps. a.) 1.21 x 105 ft-lb. c) 1.8 x 105 ft-lb 5 b.) 2.1 x 10 ft-lb. d) 1.12 x 105 ft-lb. Solution: KE= ½ mV 2

or KE= ½ (W/g)V 2

Answer: KE = 1.2 x 105 ft-lb. 29. A box slides from rest from point A down a plane inclined 30º, to the horizontal. After reaching the bottom of the plane, the box moves on horizontal floor at a distance 2 m before coming to rest. If the coefficient of friction between the box and plane and between the box and floor is k0.40, what is the distance of point “A” from the intersection of plane and the floor? a) 7.24 m c) 4.75 m b) 5.21 m d) 9.52 m Solution: Positive work – Negative work = change in K.E Answer: s = 5.21 m. 30. A 400 N block slides on a horizontal plane by applying a horizontal force of 200 N and reaches a velocity of 20 m/s in a distance of 30 m. from rest. Compute the coefficient of friction between the floor and the block. a) 0.18 c) 0.31 b) 0.24 d) 0.40 Solution: Positive work – Negative work = change in K.E, Answer: µ = 0.18

F=μN

31. A car weighing 40 tons is switched to a 2 percent upgrade with a velocity of 30 mph. If the train resistance is 10 lb/ton, how far up the grade will it go? a) 1124 ft. on slope c) 1203 ft on slope b) 2014ft. on slope d) 1402 ft on slope Solution: For small θ, Sin θ = tan θ = 0.02 Cos θ = 1 Answer: 1203 ft on slope 32. A car weighing 10 KN is towed along a horizontal road surface at a uniform velocity of 80 kph. The towing cable is parallel with the road surface. The road is straight and smooth. When the car is at the foot of an incline as shown having an elevation of 30 m, the towing cable was suddenly cut. At what elevation in the inclined road will the car stop in its upward motion? a) 55.16 m c) 51.43 m b) 60.24 m d) 49.62 m Solution: Initial K. E. + Positive work –Negative work = Final K. E. Answer: 915000 Joules 33. A wooden block starting from rest, slides 6 m down a 45º slope, then 3 m along a level surface and then up a 30º incline until it comes to rest again. If the coefficient of friction is 0.15 for all surfaces of contact, compute the total distance traveled. a) 20 m c) 14 m b) 11 m d) 18 m Solution: Positive work –Negative work =Change in K. E. Answer: 14 m 34. A 1000N block on a leveled surface is attached to 250N block hanging on the pulley. The pulley is 3m away from the first block. If the first block started at rest and moves towards the right. What is the velocity of block B as it touches the ground? How far will the block A travel along the horizontal surface if the coefficient of friction between block A and the surface is .20? Assume pulley to be frictionless. a) 1.44 m c) 5.22 m b) 2.55 m d) 3.25 m Solution: F=μN, Answer: 1.44m

V22 = V12 +2as

35. A 500n block on a n incline plane with an angle of 30º has move 3m up the incline plane due to 600N force applied. Find the velocity of the block when it returns to its initial position. a) 8.6m/s c) 6.4m/s b) 5.6m/s d) 7.1m/s Solution: ∑positive work-∑negative work = ½ (W/g)(V22-V12) ∑positive work-∑negative work = ½ (W/g)(V32-V22) Answer: 6.4m/s

36. A 10 Kg block is raised vertically 3 meters. What is the change in potential energy? Answer in SI units closest to: a) 350 kg-m 2/sec c) 350 N-m b) 320 J d) 294J Solution: PE=mgh Answer: 294J 37. A car weighing 40 tons is switched to a 2% upgrade with a velocity of 30 mph. if the car is then allowed to run back, what velocity will it have at the foot of the grade? a) 37 fps c) 43 fps b) 31 fps d) 34 fps Answer: 34 fps 38. A 200 ton train is accelerated from rest to a velocity of 30 mph on a level track. How much useful work was done? a) 12024845 c) 11038738 b) 13827217 d) 10287846 Solution: Work= W/2g(VF2-V12) Answer: 12024845 ft-lbs 39. A drop hammer weighing 40 KN is dropped freely and drives a concrete pile 150 mm into the ground. The velocity of the drop hammer at impact is 6 m/sec. what is the average resistance of the soil in KN? a) 542.4 c) 384.6 b) 489.3 d) 248.7 Solution: RS= ½ (w/g) V 40. A force of 200 lbf acts on a block at an angle of 28º with respect to the horizontal. The block is pushed 2 feet horizontally. What is the work done by this force? a)320 J c)540 J b)480 J d)215 J Solution: W=Fd Answer: 480.14 J 41. A 50 Kg object strikes the unscratched spring attached to a vertical wall having a spring constant of 20 KN/m. Find the maximum deflection of the spring. The velocity of the object before it strikes the spring is 40 m/s. a) 1m c) 3 m b) 2 m d) 4 m Solution: ½ mV2= ½ Kx2 Answer: 2 m 42. To push a 25 Kg crate up a 27º incline plane, a worker exerts a force of 120 N, parallel to the incline. As the crates slides 3.6m, how much is the work done on the crate by the worker and by the force of gravity. a) 400 J c) 380 J b) 420 J d) 350 J Solution: W=mgSin θ d Answer: 400 J

43. A train weighing 12,000 KN is accelerated at a constant rate up a 2% grade with a velocity increasing from 30 kph to 50 kph in a distance of 500 meters. Determine the horse power developed by the train. a) 5.394 kW c) 4.486 kW b) 5.120 kW d) 4.591 kW Solution: P=W Sin θ Answer: 4.468 kW 44. An elevator has an empty weight of 5160 N. It is design to carry a maximum load of 20 passengers from the ground floor to the 25th floor of the building in a time of 18 seconds. Assuming the average weight of a passenger to be 710 N and the distance between floors to be 3.5m, what is the minimum constant power needed for the elevator motor? a) 94.3 kW c) 97.4 kW b) 85.5 kW d) 77.6 kW Solution: W=FS, Answer: 94.3 kW

P= W / T

45. A piano string is 80 cm long and weighs 5 N. if the string is stretched by a force of 500 N. what is the speed of the wave set up when the hammer strikes the string? a) 26 m/s c) 28 m/s b) 27 m/s d) 30 m/s Solution: V″= T/µ Answer: 28 m/s 46. A 16-16 wire cable 100 ft long is stretched between two poles under tension of 500 lb. If the cable is struck at one end, how long will it take for the wave to travel to the far end and return. a) 0.63 s c) 0.65 s b) 0.64 s d) 0.66 s Solution: V″= T/µ Answer: 0.63 s

µ=[(16 lb/32.2 ft/sec″)/(100 ft)]

47. Assume that young modulus for silver is 77.5 G N/m″. If it has density 10.5x10≥kg/m≥, how fast does sound travel through the silver? a) 2600 m/s c) 1600 m/s b) 2700 m/s d) 1700 m/s Solution: V″= E/p Answer: 2700 m/s 48. The speed of a compressional wave in silver, specific gravity 10.5,is 2610 m/s. compute y for silver. a) 71.6 G N/m″ c) 7.16 G N/m″ b) 76 G N/m″ d) 716 G N/m″ Solution: V″= E/p Answer: 71.6 G N/m″ 49. Two waves whose frequencies are 500 and 511 per second travel out from a common point. Find their difference in phase after 1.40 s. a) 143 ° c) 145 ° b) 144 ° d) 146 ° Solution: Ө = 2¶ ft

Answer: 144 °

50. A copper has a density of 9 g/cm≥ and a bulk modulus of 120 G N/m″. What is the speed of a wave through it? a) 3600 m/s c) 6030 m/s b) 6300 m/s d) 1460 m/s Solution: V″= E/p Answer: 3600 m/s 51. What is the velocity of a wave along a cord having a linear mass of 4 g/cm if the cord is stretched to have a tension of 90K dyne? a) 3600 m/s c) 6030 m/s b) 6300 m/s d) 1460 m/s Solution: V″= E/p Answer: 3600 m/s 52. What is the wavelength in air under standard conditions of a compressional wave whose frequency is 250 per second? Assume that the bulk modulus for air is 1.40Mdyne/cm″ and the density of air is 1.29 g/L. a) 132 cm c) 123 cm b) 231 cm d) 321 cm Solution: V= (E/p) = ƒlamda Answer: 132 cm 53. What tension would be required to create a standing wave with four segments in a string 100 cm long weighing 0.50 g. If it is attached to a vibrator with a frequency of 100 Hz? a) 0.125M dyne c) 0.152 dyne b) 0.521M dyne d) 0.251 dyne Solution: V= (T/∝) = ƒlamda Answer: 0.125M dyne 54. What is the velocity of a wave along a chord having a linear mass of 4 g/cm if the chord is stretched to have a tension of 90K dyne? a) 105 cm/s c) 501 cm/s b) 150 cm/s d) 510 cm/s Solution: V= (T/∝) Answer: 150 cm/s 55. What is the theoretical speed of sound in oxygen at 0°C. for a diatomic gas u=1.40, and for oxygen M= 32.00 g/mol. a) 315 m/s c) 500 m/s b) 215 m/s d) 351 m/s Solution: V= (T/∝) Answer: 150 cm/s 56. A sonar device on a submarine sends out a signal and receives an echo 5s later. Assuming the speed of sound in water to be 1452 m/s, how far away is the object that is reflecting the signal? a) 3526 m c) 3625 m b) 4215 m d) 3512 m

Solution: 2s = vt Answer: 3625 m 57. What note is sounded by a siren having a disk with 16 holes and making 20 r/s? a) 320 Hz c) 302 Hz b) 220 Hz d) 230 Hz Solution: F = (16 r¯≠)(20(r/s)) Answer: 320 Hz 58.If one sound is 5.0 dB higher than another, what is the ratio of their intensities? a) 3.16 c) 2.55 b) 31.6 d) 35.1 Answer: 3.16 59. Two sounds have intensities of 0.5 and 10 W/m² respectively. How many a) 1.3 c) 3.1 b) 13 d) 31

decibels is one louder than the other?

Answer: 13 dB 60. Two sound waves have intensities of 100 and 400 ∝W/cm″, respectively. How a) 0.6 dB c) 4 dB b) 6 dB d) 7 dB

much louder is one than the other?

Answer: 6 dB 61. If an unshaded electric lamp is 6 m above a table and is lowered to 3 m, how increase? a) 1 c) 3 b) 2 d) 4

much

has

its

luminance

been

Solution: E= (I/s″) Cos θ Answer: 4 62. A lamp produces a certain luminance on a screen situated 85 cm from it. On placing a glass plate between the lamp and the screen, the lamp must be moved 5 cm closer to the screen to produced same illuminance as before. What percent of the light is stopped by the glass? a) 11 % c) 13 % b) 12 % d) 14 % Solution: E= (I/s″) Cos θ Answer: 11% 63. If a lamp provides an illuminance of 8.0 mc on a book is moved 1.5 times as far sufficient for comfortable reading? a) 2.5 mc c) 3 mc b) 3.6 mc d) 4 mc Solution: Answer: 3.6 mc Comfortable illuminance is 50 fc

away, will the new illumination then be

64. If the light of a full moon is found to produce the same illuminance as a 1.0 cd source does at a distance of 4.0 ft, what is the effective luminous intensity of the moon? (the mean distance of the moon is 239,000 mi.) a) 1 c) 3 b) 2 d) 4 Solution: E= (I/s″) Cos θ Answer: 1.0 x 10 cd 65. An unknown lamped placed 6 m from a photometer screen provides the same m from that same screen. What is the candle power of the unknown lamp. a) 180 cd c) 280 cd b) 200 cd d) 100 cd

illumination as an 80 cd lamp placed 4

Solution: E= (I/s″) Cos θ Answer: 180 cd 66. A standard 48 - cd lamp is placed 30 cm from a photometer screen and produces the same illumination as a 60 -cd lamped placed some distance away. How far away is the 60 -cd lamp from the screen? a) 33.54 cm c) 33.43 cm b) 23.54 cm d) 25.43 cm Solution: (I2/I1)=(S2/S1)1/2 Answer: 33.54 cm 67. Two point sources of light are placed 4.0m apart on a photometer. If one is a standard of 50 cd and they produced equal illuminance at a point 2.5m from the standard source, what is the intensity of the second source. a) 18 cd c) 20 cd b) 19 cd d) 17 cd Solution: E1= E2 I1/S12 = I2/ S22 Answer: 18 cd 68. A point source of light of 10 cd is enclosed at the middle of a hollow sphere having a radius of 4 m. if an opening of 10 m 2 exist in the sphere, what is the luminous flux through the opening. a) 625 m c) 6.25 m b) 62.5 m d) 0.625 m Solution: F= Iw Answer: 6.25 m

w=a/s2

69. Find the candle power of a point source of light that provides 20 mc of a) 320 cd c) 3.20 cd b) 32.0 cd d) 217 cd

illumination on a surface4 m away.

Solution: I= ES2 Answer: 320 cd 70. What is the vertical length of the smallest plane mirror in which a man 2 m tall of his head to his feet? a) 18 cd c) 20 cd b) 19 cd d) 17 cd Solution: Apply similar triangle law Answer: 1 m (vertical length of the smallest plane mirror for viewing full height)

can just see his full height from the top

71. A person backing a car up sees in the rearview mirror a person walking toward him at 5 km/hr. if the car is moving backward at 10 km/hr, how fast does the person as viewed from the mirror approached the car. a) 10 km/h c) 50 km/h b) 20 km /h d) 30 km/h Solution: Velocity as viewed from the mirror= twice the velocity of the person relative to Answer: 30 km /hr

the car

72. The distance of comfortable distinct vision is about 25 cm for the average person. Where should a person hold a plane mirror in order to see himself conveniently. a) 12.5 cm c) 20 cm b) 125 cm d) 10 cm Solution: 2s= 25cm

Answer: 12.5 cm

73. An object is placed 20 cm in front of a concave mirror of radius 60 cm. Where a) 12 cm c) 60 cm b) 25 cm d) 100 cm

is the image?

Solution: 1/p + 1/q = 1/f Answer: -60 cm 74. In what position in front of a spherical mirror should an object be placed to produce a real image which is magnified three times if the radius of curvature of the mirror is 18 cm? a) 12 cm c) 7 cm b) 9 cm d) 10 cm Solution: 1/p + 1/q = 1/f Answer: 12 cm

M= q/p

1/p + 1/3p = 1/9

75. A dentist holds a concave mirror of radius of curvature 6.0 cm at a distance 2.0 magnification of the filling? a) 2 c) 5 b) 4 d) 3 Solution: 1/p + 1/q = 1/f Answer: 3

M= / q/p /

1

76. A convex mirror whose focal length is 15 cm has an object of 10 cm tall and 60 size of the object. For position: a) -12 cm c) -7 cm b) -9 cm d) -10 cm Solution: 1/p + 1/q = 1/f Answer: -12 cm 77. For nature: a) real b) virtual Answer: virtual 78. For size: a) 2 cm b) 3 cm

c) 4 cm d) 1 cm

Solution: for size use similar triangle Answer: 2

cm from a filling in a tooth. What is the

cm away. Find the position, nature, and

79. In what position should an object be placed in front of a concave mirror having a image which is twice as large as the object is formed. a) 12 cm c) 7 cm b) 9 cm d) 10 cm

focal length of 20 cm so that an erect

Solution: use similar triangle Answer: 10 cm 80. The angle of incidence of a ray of light at the surface of water is 40° and the Compute the index of refraction. a) 13.25 c) 1.25 b) 1.325 d) 132.5 cm

observe angle of refraction is 29°.

Solution: nr = sin i / sin r Answer: 1.325 81. The velocity of light in a liquid is 0.80 as fast as it is in air . What is the index of a) 13.25 c) 1.25 b) 1.325 d) 132.5 cm

refraction of the liquid?

Solution: n = c/V Answer: 1.25 82. A ray of light strikes a water surface at an angle. The angle of refraction in the must be the angle of incidence of the light ray have been? a) 45° c) 35° b) 25° d) 40° Solution: nr =1.333(water at 20°) and nr =1.000292(dry air) Answer: 29.95° 0r 30°

water is measured to be 22°. What

n1 sin i = n2sin r

1.

The maximum displacement of a particle in vibration relative to the position of the equilibrium. a) Wave front c) Amplitude b) Frequency d) Period Answer: amplitude

2.

A type of wave in which the particles vibrate in direction at right angles to the direction of the wave travel. a) Wave front c) Longitudinal waves b) Transverse waves d) wave length Answer: Transverse waves

3.

A type of wave in which individual particles vibrate in a direction parallel to the direction of the wave travel. a) Longitudinal waves c) wave front b) Stationary wave d) Transverse waves Answer: Longitudinal wave

4.

A surface that passes through all points in the wave those are in the same phase. a) Longitudinal waves c) wave front b) Transverse waves d) stationary wave Answer: Wave front

5.

6.

Interference in which two waves arrive at a point in phase with each other and the resulting amplitude is the sum of the amplitudes is the sum of the amplitudes of the two original waves. a) Constructive interference b) Destructive interference Answer: Constructive interference the waves arrive a half wave out of phase and the resultant amplitude is the difference between the two amplitude. Destructive interference Constructive interference Answer: Destructive interference

7.

A principle stating that each point on a wave front may be considered as a new source of disturbance sending wavelets in forward direction. At any instant the new wave front is the surface tangent to all wave length. a) Huygen’s principle c) Hugen’s principle b) Hygen’s principle d) Hegyn’s principle Answer: Huygen’s principle

8.

The change of direction of a wave due to speed changes. a) Dispersion c) wave front b) Refraction d) wave misalignment Answer: Refraction

9.

Wave produced when two waves of equal amplitude and frequency travel in opposite directions in a medium. a) Stationary Wave c) wave front b) Antinodes d) wave misalignment

Answer: Stationary wave 10. Points in a stationary wave at which the amplitude is zero. a) antinodes b) nodes Answer: Nodes

11. Points of maximum amplitude. a) antinodes b) nodes Answer: antinodes 12. A disturbance caused by a vibrating body and sense by the ear. a) force vibration c) sound b) resonance d) intensity Answer: sound 13. Set up by an elastic body by another vibrating body. a) resonance b) amplitude b) forced vibration d) super sonic wave Answer: forced vibration 14. Forced vibration where the natural frequency of the coupled body is the same as that of the vibrator. a) resonance b) amplitude b) forced vibration d) super sonic wave Answer: resonance 15. Effect due to the combined action of two set of waves passing through a single region at the same time. a) interference b) Doppler effect b) refraction d) ultrasonic Answer: interference 16. The apparent frequency of a sound source is changed if there is relative motion between the source and the observer a) Doppler effect c) interference b) supersonic d) ultrasonic Answer: Doppler effect 17. A highly concentrated pressure wave caused by an object flying faster than speed of sound. a) sonic-boom shock wave c) supersonic b) ultrasonic d) resonance Answer: sonic- boom shock wave 18. A speed greater than the speed of sound. a) supersonic b) ultrasonic

c) infrasonic d) micro sonic

Answer: supersonic 19. Sound produced by an object that vibrates with a frequency above the range of human hearing. a) supersonic c) infrasonic b) ultrasonic d) micro sonic Answer: ultrasonic 20. The study of sound production and transmission in relation to the human sense of hearing. a) music c) noise b) acoustic d) pitch Answer: acoustic

21. A sound produce by a regular vibration. a) musical tone b) acoustic

c) noise d) pitch

Answer: musical tone 22. Any undesirable sound. a) musical tone b) acoustic

c) noise d) pitch

Answer: noise 23. The highness or lowness of a sound as characterized by the frequency of vibration. a) musical tone c) noise b) acoustic d) pitch Answer: pitch 24. Refers to the complexity of the sound. a) musical tone b) acoustic

c) noise d) pitch

Answer: pitch 25. The magnitude of hearing sensation produced by the sound. a) intensity c) loudness b) intensity level d) bell Answer: loudness 26. The rate at which sound energy flows through a unit area. a) intensity c) loudness b) intensity level d) bell Answer: intensity 27. The logarithm of the ratio of the intensity of a sound to an arbitrary chosen intensity. a) intensity c) loudness b) intensity level d) bell Answer: intensity level 28. The unit of intensity. a) intensity b) intensity level

c) loudness d) bel

Answer: bel 29. The succession of tones related to each other. a) musical tone b) intensity level

c) musical pitch d) music

Answer: musical scale 30. The persistence of sound in a enclose space. a) echo c) reflection b) reverberation d) complexity Answer: reverberation

31. Rebounding of light from certain substances. a) reflection b) interference

c) refraction d) diffraction

Answer: reflection 32. The property of light by which it travels in a straight line. a) intensity c) polarization b) rectilinear propagation d) diffraction Answer: rectilinear propagation 33. The process by which the vibrations of light are confined to a definite plane. a) intensity c) polarization b) rectilinear propagation d) diffraction Answer: polarization 34. A theory which states that light is a special form of wave disturbances. a) wave theory or adulatory theory of light b) quantum theory Answer: wave theory or adulatory theory of light 35. States that energy exchanges between matter occur in discrete amounts of energy which are proportional to the frequency. a) wave theory or adulatory theory of light b) quantum theory Answer: quantum theory 36. Refers to the quantity of visible radiation passing per unit time. a) luminous flux c) lumen b) quantum theory d) candle Answer: luminous flux 136. Unit of luminous intensity a) luminous flux b) luminous intensity

c) lumen d) candle

Answer: candle 137. Unit of luminous flux. a) luminous flux b) luminous intensity

c) lumen d) candle

Answer: lumen 138. Evaluated in terms of the power that causes the brightness sensation from a a) illuminance c) lumen b) luminous intensity d) candle Answer: luminous intensity 139. Luminous flux per unit area that reaches the surface. a) illuminance c) lumen b) luminous intensity d) candle Answer: illuminous

standard candle.

140. A faint blue white glow produced in water and other transparent substances when charges particles pass through the substances at speeds greater than the speed of light through these substances. a) illuminance c) blue tooth b) cherenkov radiation d) radiation Answer: cherenkov radiation 141. Instrument use for comparing luminous intensities of light sourced. a) odometer c) luminance b) luminous tester d) photometer Answer: photometer 142. Source intensity per unit projected area of emitting surface. a) odometer c) luminance b) luminous tester d) photometer Answer: luminance 143. Law of reflection. a) the angle of reflection is equal to the angle of incidence. b) the reflected ray, the incident ray, and the normal to the surface are in the same plane principal focus of a spherical mirror. c) both a and b d) none of the above 144. Rays farther from the principal axis of the spherical mirror are reflected to cross the axis nearer to the mirror than those close to the axis. a) spherical c) vertical length b) aberration d) spherical aberration Answer: spherical aberration 145. The ratio of the speed of light v1 in the first medium to the speed v2 in the second medium. a) absolute index of refraction c) total internal refraction b) index of refraction d) mirage Answer: index of refraction 146. The ratio of the speed of light in empty space to the speed in the medium. a) absolute index of refraction c) total internal refraction b) index of refraction d) mirage Answer: absolute index of refraction 147. Phenomenon due to atmospheric refraction. a) absolute index of refraction c) total internal refraction b) index of refraction d) mirage Answer: mirage 148. Occur when light passes from a medium of less speed to one of greater a) absolute index of refraction c) total internal refraction b) index of refraction d) mirage Answer: total internal refraction

speed.

149. The point at which rays parallel to the principal axis converge after passing a) principal focus c) real image b) focal length d) virtual image

through a converging lens.

Answer: principal focus 150. Distance of principal focus from the lens. a) principal focus b) focal length

c) real image d) virtual image

Answer: focal length 151. When the principal focus is between object and lens. a) primary c) real image b) focal length d) virtual image Answer: real image 152. When object is between lens and principal focus. a) converging lens b) focal length

c) real image d) virtual image

Answer: virtual image 153. A type of lens which causes a set of parallel rays to converge after passing a) converging lens c) real image b) diverging lens d) virtual image

through the lens

Answer: converging lens 154. A lens that causes parallel rays to diverge after refraction. a) converging lens c) real image b) diverging lens d) virtual image Answer: diverging lens 155. It only produces a virtual image of any object regardless of position. a) converging lens c) diverging lens b) first surface d) diverging image Answer: diverging lens 156. The defect of a lens by which rays entering near the edge of the lens are brought to a focus nearer the lens than the rays that enter near the center. a) coma c) astigmatism b) distortion d) spherical aberration Answer: spherical aberration 157. A form of lateral spherical aberration whereby rays from object points not on comet-shaped image. a) coma c) astigmatism b) distortion d) spherical aberration

the principal axis are focused in a

Answer: coma 158. Caused by variations in the magnification of the outermost portion of the image, resulting in a barrel-shaped or pincushion-shaped images of a square- mesh object. a) coma c) astigmatism b) distortion d) spherical aberration Answer: distortion

159. The defect whereby horizontal and vertical lines are brought to a focus at different distances. a) coma c) astigmatism b) distortion d) spherical aberration Answer: astigmatism 160. The adjustment of the eye for seeing at different distances. a) hyperopia c) myopia b) accommodation d) magnifier Answer: accommodation 161. The inability of the eye to clearly see distant objects. a) hyperopia c) myopia b) accommodation d) magnifier Answer: myopia 162. The difficulty of the eye to focus on very close object. a) hyperopia c) myopia b) accommodation d) magnifier Answer: hyperopia 163. A converging lens use to produce an enlargement effect. a) hyperopia c) myopia b) accommodation d) magnifier Answer: magnifier. 164. Ratio of the angle subtended at the eye by the image to the angle subtended a) angular vision c) angular displacement b) angular modulation d) angular magnification

by the object.

Answer: angular magnification 165. The variation of the index of refraction with the wavelength of light. a) angular dispersion b) optical dispersion Answer: optical dispersion. 166. Produces deviation without dispersion. a) prism spectroscope b) fluorescence

c) achromatic prism or lens d) chromatic aberration

Answer: achromatic prism or lens 167. Light rays of different wave lengths originating from a common point are brought to different foci by a lens. a) prism spectroscope c) achromatic prism or lens b) fluorescence d) chromatic aberration Answer: chromatic aberration 168. A combination of a prism an achromatic lenses. Used to separate the various spectrum. a) prism spectroscope c) achromatic prism or lens b) fluorescence d) chromatic aberration Answer: prism spectroscope

wavelengths in a beam of light into its

169. A process in which substance absorbs radiant energy and remits it in wavelengths, different from those absorb. a) phosphorescence c) achromatic prism or lens b) fluorescence d) chromatic aberration Answer: fluorescence 170. Occurs when the process of fluorescence continues after the exciting radiation a) prism spectroscope c) achromatic prism or lens b) fluorescence d) chromatic aberration

is removed.

Answer: phosphorescence 171. The science that seeks to relate the human sense of color perception to the as to produce practical graphical and numerical specification of color. a) colorimetry c) chief spectral hues b) color characterization d) complementary beams

physical light stimulus in such a way

Answer: colorimetry 172. Hue, saturation, brightness, or lightness of a color. a) primaries c) chief spectral hues b) color characterization d) complementary beams Answer: characteristic of color 173. What hue does the color violet, blue, green, yellow, orange, and red belong. a) primaries c) chief spectral hues b) color characterization d) complementary beams Answer: chief spectral hues 174. Monochromatic or polychromatic pairs which when in proper proportions produce the sensation of white. a) primaries c) chief spectral hues b) color characterization d) complementary beams Answer: complementary beams 175. Any three beams having wavelengths near the two extremes and the middle of in correct proportions produce the sensation of white. a) primaries c) chief spectral hues b) color characterization d) chromaticity coordinates

spectrum . These beams when added

Answer: primaries 176. Specification of color quantitatively in terms of relative amounts of three artificial primaries necessary to produce a visual equivalent of that color. a) primaries c) chief spectral hues b) color characterization d) chromaticity coordinates Answer: chromaticity coordinates 177. Interference fringes formed in air films between optical surfaces. The spacing of measuring a) constructive interference c) destructive interference b) Michelson interferometer d) Newton’s ring Answer: Newton’s ring 178. An instrument that uses interference in the measurement of light wavelengths. a) constructive interference c) destructive interference

of the rings provide a sensitive means

b) Michelson interferometer

d) Newton’s ring

Answer: Michelson interferometer 179. The spreading of light into the region behind an obstacle. a) interference c) destructive interference b) diffraction d) Newton’s ring Answer: Diffraction 180. The process by which the vibrations of a wave motion are confined to a definite a) polarization c) angle of polarization b) Malu’s law d) Newton’s ring Answer: polarization 181. Angle at which light reflected from a substance is almost completely planeda) polarization c) angle of polarization b) Malu’s law d) angular displacement

pattern.

polarized.

Answer: angle of polarization 182. Instrument for measuring optical rotation. a) polarization b) Malu’s law

c) polarimeters d) light meter

Answer: polarimeters 183. A branch of physics that deals with the properties of electricity at rest. a) electrical c) electrification b) electrostatics d) magnetism Answer: polarization 184. The process of rubbing two materials together and then separating them to a) energy convention c) electrification b) electrostatics d) magnetism Answer: electrification 185. Bodies of similar charges repel and bodies of unlike charges attract. a) first law of electrostatics c) third law of electrostatics b) second law of electrostatics d) fourth law of electrostatics Answer: first law of electrostatics 186. What charges will be produce if you rub glass rod with silk. a) positive charge b) negative charge c) neutral Answer: positive charge 187. What charges will be produce if you rub rubber rod with fur. a) positive charge b) negative charge does not create energy c) neutral Answer: negative charge

produce charge on the materials.

188. The rubbing of an objects does not create energy but merely changes the electrical neutrality of the substance in contact. a) first law of electrostatics c) law of conservation of charge b) second law of electrostatics d) Newton’s law Answer: law of conservation of charge 189. Small, tightly packed, positively charged mass that consist of protons and neutrons. a) electrons c) nucleus b) neutrons d) free electron Answer: nucleus 190. Negatively charge particles. a) electrons b) neutrons

c) nucleus d) free electron

Answer: electrons 191. Positive charges particles in the nucleus. a) neutrons b) proton

c) insulator d) free electron

Answer: proton 192. Particles that carry no charges. a) neutrons b) proton

c) insulator d) free electron

Answer: neutrons 193. Removed from an atom or atoms due to the influence of nearby atoms. a) neutrons c) insulator b) proton d) free electron Answer: free electron 194. A substance with very few free electrons. a) neutrons b) proton

c) insulator d) semiconductor

Answer: insulator 195. Materials that are ordinarily insulators but which become conductors when under particular conditions. a) neutrons c) insulator b) proton d) semiconductor Answer: semiconductor 196. A device for studying electrostatic phenomena. Consist of very light gold leaf, contact on a flat metal plate which ends in a ball at the upper end. a) electroscope c) force scope b) leaf electroscope d) gold scope

or other thin metal foil, hanged from a

Answer: leaf electroscope 197. A point charged that is repelled by a force of one dyne when place one cm a) statcoulomb b) coulomb Answer: stat coulomb

from an equal charged.

198. The charged transferred through any cross section of a conductor in one second by a constant current of one ampere. a) statcoulomb b) coulomb Answer: coulomb 199. A region in which a charge will be subjected to a force a) electric field b) electric field intensity Answer: electric field 200. A line so drawn in an electric field such that a tangent to it at any point gives the point. a) electric field line c) line of force b) electric field intensity d) tangent line Answer: line of force

direction of the electric field at that