Kinematics: Question 1 Of 4

Kinematics: Question 1 of 4 The diagram below shows a worker using a rope to pull a cart. The worker’s pull on the handle of the cart can best be described as a force having

1. 2. 3. 4.

magnitude, only direction, only both magnitude and direction neither magnitude nor direction

Correct Answer Number: 3 Explanation: The worker is pulling with a FORCE. All forces are vectors i.e. have magnitude and direction

Kinematics: Question 2 of 4 A car travels 90. meters due north in 15 seconds. Then the car turns around and travels 40. meters due south in 5.0 seconds. What is the magnitude of the average velocity of the car during this 20.-second interval? 1. 2. 3. 4.

2.5 m/s 5.0 m/s 6.5 m/s 7.0 m/s

Correct Answer Number: 1 Explanation: The basic equation is v = d/t. The DISPLACEMENT of the car is 90 m - 40 m = 50 m, the total time is 20s. V = 50m/20s

Kinematics: Question 3 of 4 How far will a brick starting from rest fall freely in 3.0 seconds? 1. 2. 3. 4.

15 m 29 m 44 m 88 m

Correct Answer Number: 3 Explanation: Basic equation is d=vit+1/2at2. The block starts from rest so the initial velocity is zero. The equation becomes d=1/2at2. The only acceleration the brick feels is the acceleration due to gravity = 9.81m/s2.

Statics: Question 1 of 5 If the sum of all the forces acting on a moving object is zero, the object will 1. 2. 3. 4.

slow down and stop change the direction of its motion accelerate uniformly continue moving with constant velocity

Correct Answer Number: 4 Explanation: For something to change direction or accelerate there must be an UNBALLANCED force acting on it. Newton’s 1st law states that an object in motion will stay in motion at constant velocity unless acted upon by an unbalanced force.

Statics: Question 2 of 5

The graph below represents the relationship between gravitational force and mass for objects near the surface of Earth. The slope of the graph represents the

1. 2. 3. 4.

acceleration due to gravity universal gravitational constant momentum of objects weight of objects

Correct Answer Number: 1 Explanation: When graphing think of the equation y=mx, y is equal to the slope times x. Here the y is gravitational force (weight) and x is mass. W = mg, weight is equal to mass times acceleration due to gravity. Weight is the "Y", mass is the "X" so the slope has to be the acceleration due to gravity.

Statics: Question 3 of 5 A spring scale reads 20. newtons as it pulls a 5.0-kilogram mass across a table. What is the magnitude of the force exerted by the mass on the spring scale? 1. 2. 3. 4.

49 N 20. N 5.0 N 4.0 N

Correct Answer Number: 2 Explanation: Action /reaction forces are equal.

Statics: Question 4 of 5 Note that this question only has three choices. The diagram below shows a block sliding down a plane inclined at angle Θ with the horizontal. As angle Θ is increased, the coefficient of kinetic friction between the bottom surface of the block and the surface of the incline will

1. decrease 2. Increase 3. remain the same 4. Correct Answer Number: 3 Explanation: coefficient of kinetic friction is independent of the angle

Statics: Question 5 of 5

An object weighs 100. newtons on Earth’s surface. When it is moved to a point one Earth radius above Earth’s surface, it will weigh 1. 2. 3. 4.

25.0 N 50.0 N 100. N 400. N

Correct Answer Number: 1 Explanation: Basic equation Fg=Gm1m2/r2. When the object is moved 1 earth radius away from the earth r is now 2r (on the surface of the earth the object is 1 earth radius away from the center of the earth, when the object is moved 1 radius away the distance is now r+r or 2r). When you plug (2r)2 into the denominator of the equation it becomes 4r2. You have to square the 2 as well as the r.

Dynamics: Question 1 of 4 A net force of 10. newtons accelerates an object at 5.0 meters per second2. What net force would be required to accelerate the same object at 1.0 meter per second2? 1. 2. 3. 4.

1.0 N 2.0 N 5.0 N 50. N

Correct Answer Number: 2 Explanation: Use the equation m=F/a (F=ma) to calculate the mass of the object, then use F=ma (F=2kg x 1m/s2)to find the force.

Dynamics: Question 2 of 4

A 2.0 x 103-kilogram car travels at a constant speed of 12 meters per second around a circular curve of radius 30. meters. What is the magnitude of the centripetal acceleration of the car as it goes around the curve? 1. 2. 3. 4.

0.40 m/s2 4.8 m/s2 800 m/s2 9,600 m/s2

Correct Answer Number: 2 Explanation: Centripital acceleration is v2/r

Dynamics: Question 3 of 4 A 2.0 x 103-kilogram car travels at a constant speed of 12 meters per second around a circular curve of radius 30. meters. As the car goes around the curve, the centripetal force is directed 1. 2. 3. 4.

toward the center of the circular curve away from the center of the circular curve tangent to the curve in the direction of motion tangent to the curve opposite the direction of motion

Correct Answer Number: 1 Explanation: centripetal force, and centripetal acceleration, always point in toward the center of the circle.

Dynamics: Question 4 of 4 The amount of work done against friction to slide a box in a straight line across a uniform, horizontal floor depends most on the 1. 2. 3. 4.

time taken to move the box distance the box is moved speed of the box direction of the box’s motion

Correct Answer Number: 2 Explanation: Basic equation W=F x d. the work is dependent on the distance the box is moved.

Momentum: Question 1 of 2 A 1,200-kilogram car traveling at 10. meters per second hits a tree and is brought to rest in 0.10 second. What is the magnitude of the average force acting on the car to bring it to rest? 1. 2. 3. 4.

1.2 × 102N 1.2 × 103N 1.2 × 104N 1.2 × 105N

Correct Answer Number: 4 Explanation: Impulse = change in momentum, J=delta p or Ft = mv. We are given m, v and t. Plug numbers in and solve for F.

Momentum: Question 2 of 2

information below. A 2.0 × 103-kilogram car travels at a constant speed of 12 meters per second around a circular A 1.2-kilogram block and a 1.8-kilogram block are initially at rest on a frictionless, horizontal surface. When a compressed spring between the blocks is released, the 1.8-kilogram block moves to the right at 2.0 meters per second, as shown. What is the speed of the 1.2-kilogram block after the spring is released?

1. 2. 3. 4.

1.4 m/s 2.0 m/s 3.0 m/s 3.6 m/s

Correct Answer Number: 3 Explanation: The momentum of the system before is equal to the momentum of the system after or m1v1 = m2v2 v1 = m2v2/m1.

Power: Question 1 of 1

A 3.0-kilogram block is initially at rest on a frictionless, horizontal surface. The block is moved 8.0 meters in 2.0 seconds by the application of a 12-newton horizontal force, as shown in the diagram below. What is the average power developed while moving the block?

1. 2. 3. 4.

24 W 32 W 48 W 96 W

Correct Answer Number: 3 Explanation: The equation is P=W/t or P=Fd/t. force, distance and time are all given in the question. The mass of the object is extraneous information.

Energy: Question 1 of 2 An object weighing 15 newtons is lifted from the ground to a height of 0.22 meter. The increase in the object’s gravitational potential energy is approximately 1. 2. 3. 4.

310 J 32 J 3.3 J 0.34 J

Correct Answer Number: 3 Explanation: PE=mgh. The weight, 15 N is mg and the height is 0.22 m.

Energy: Question 2 of 2

Note that this question has only three choices As an object falls freely, the kinetic energy of the object 1. decreases 2. increases 3. remains the same 4. Correct Answer Number: 2 Explanation: The kinetic energy is related to the velocity, KE=1/2mv2. As an object falls freely the velocity increases and therefore the kinetic energy increases.

Static Electricity: Question 1 of 3

The diagram below shows three neutral metal spheres, x, y, and z, in contact and on insulating stands. Which diagram best represents the charge distribution on the spheres when a positively charged rod is brought near sphere x, but does not touch it?

1.

2.

3.

4.

Static Electricity: Question 2 of 3

Which graph best represents the electrostatic force between an alpha particle with a charge of +2 elementary charges and a positively charged nucleus as a function of their distance of separation?

1.

2.

3.

4. Correct Answer Number: 1 Explanation: Basic equation Fe = kq1q2/r 2. K, q1 and q2 all remain constant throught the problem, the only thing that changes is r, the distance of seperation. Remember when graphing think of the equation for a line, y=mx. here we are graphing Fe= a constant/r 2. Use your graphing calculator to graph y=1/x2.

Static Electricity: Question 3 of 3 When a neutral metal sphere is charged by contact with a positively charged glass rod, the sphere 1. 2. 3. 4.

loses electrons gains electrons loses protons gains protons

Correct Answer Number: 1 Explanation: To make something positive we are essentially making it less negative. To make it less negative we would need to lose electrons. Protons can not be removed from an atom, except in nuclear reaction that release large amounts of energy.

Electric Current: Question 1 of 1 Moving 2.5 × 10–6 coulomb of charge from point A to point B in an electric field requires 6.3 × 10–4 joule of work. The potential difference between points A and B is approximately 1. 2. 3. 4.

1.6 × 10–9V 4.0 × 10–3V 2.5 × 10–2V 1.0 × 10–14V

Correct Answer Number: 3 Explanation: V=W/q. work and charge are both given in the problem.

Physics: Multiple Choice Questions on Gravitation 1. A reference frame attached to the Earth

cannot be an inertial frame of reference because of the Earth's rotation and revolution. is an inertial frame by definition. is not an inertial frame because the Earth moves with respect to the Sun. is an inertial frame because Newton's laws of motion are applicable inside it. 2. If the escape velocity of a rocket from the surface of the Earth is ve , then the escape velocity of the same rocket from the surface of a planet whose acceleration due to gravity as well as radius are 3 times that of the Earth is 3 ve

ve / 3

ve

9 ve

3. A planet is moving around the Sun in a circular orbit of circumference C. The work done on the planet by the gravitational force F of the Sun is FC/2

F/C

FC

Zero.

4. A satellite is moving around the Earth in a circular orbit with a velocity V. If the gravitational force of the Earth were to suddenly disappear, then the satellite would move with a velocity V, tangentially to its circular orbit. spirally move away from the Earth. move radially outwards with a velocity V. fall towards the surface of the Earth. 5. If the distance between two masses is increased by a factor of 4, the gravitational force of attraction between them will reduce by a factor of 16 increase by a factor of 4 remain Same reduce by a factor of 4 1. A reference frame attached to the Earth

cannot be an inertial frame of reference because of the Earth's rotation and revolution. is an inertial frame by definition. is not an inertial frame because the Earth moves with respect to the Sun. is an inertial frame because Newton's laws of motion are applicable inside it. 2. If the escape velocity of a rocket from the surface of the Earth is ve , then the escape velocity of the same rocket from the surface of a planet whose acceleration due to gravity as well as radius are 3 times that of the Earth is 3 ve

ve / 3

ve

9 ve

3. A planet is moving around the Sun in a circular orbit of circumference C. The work done on the planet by the gravitational force F of the Sun is FC/2

F/C

FC

Zero.

4. A satellite is moving around the Earth in a circular orbit with a velocity V. If the gravitational force of the Earth were to suddenly disappear, then the satellite would move with a velocity V, tangentially to its circular orbit. spirally move away from the Earth. move radially outwards with a velocity V. fall towards the surface of the Earth. 5. If the distance between two masses is increased by a factor of 4, the gravitational force of attraction between them will reduce by a factor of 16 increase by a factor of 4 remain Same reduce by a factor of 4

QUESTION 1*

This and the following question concern the same physical situation. Peter goes for a walk along the x-axis. The walk takes him 400 seconds to complete. The graph shows his position X as a function of time. What was the average velocity of the walk? (a) 0 m/s (b) 1 m/s (c) 2 m/s (d) 3 m/s (e) 4 m/s

QUESTION 2* What was the maximum speed reached during the walk? (a) 0.5 m/s (b) 1.0 m/s (c) 2.0 m/s (d) 4.0 m/s (e) 5.0 m/s

QUESTION 3* This and the following question concern the same physical situation. This velocity vs. time graph represents the motion of a car. What was the acceleration of the car at t = 35 s ? (a) -2 m/s2 (b) -1 m/s2 (c) 0 m/s2 (d) 1 m/s2 (e) 2 m/s2

QUESTION 4** What was the displacement of the car between t = 0 s and t = 40 s? (a) 0 m (b) 200 m (c) 250 m (d) 350 m (e) 550 m

QUESTION 5**

This and the following three questions concern the same physical situation. A 2 kg ball is thrown straight up with an initial velocity of 10 m/s. Your ycoordinate axis is pointing up. When the ball reaches its maximum altitude the y-component of its acceleration is: (a) 0 (b) -g (c) +g

QUESTION 6* What is the maximum altitude reached by the ball? (a) 1 m (b) 2.4 m (c) 5.1 m (d) 9.8 m (e) 19.6 m

QUESTION 7* A second ball, having a mass of 1 kg, is thrown straight up with the same initial velocity as the first ball. Compared to the first ball, the second ball will reach (a) the same altitude. (b) a smaller altitude. (c) a larger altitude.

QUESTION 8** Now consider two identical balls thrown at the same time. Ball 1 is thrown straight up with an initial speed of V0, and ball 2 is thrown at 45° with the same initial speed V0. Which ball hits the ground first? (a) Ball 1. (b) Ball 2. (c) They both hit the ground at the same time.

QUESTION 9* This and the following question concern the same physical situation. A cannon ball is fired at an angle of 30° above horizontal with an initial speed vo = 250 m/s, reaching a maximum height h before hitting the ground.

What is the maximum height h reached by the ball? (a) h = 447 m (b) h = 796 m (c) h = 981 m (d) h = 2420 m (e) h = 3185 m

QUESTION 10* Suppose the answer to the above problem is h. If the cannon is fired with an initial speed of 2 vo, the maximum height reached by the ball will be: (a) 2h (b) 3h (c) 4h

QUESTION 11** Suppose a box having a mass M sits on the floor of an elevator that is moving upward but is slowing down. Compare the weight of the box (Mg) to the magnitude of the normal force exerted by the elevator floor on the box (FN). (a) FN < Mg (b) FN = Mg (c) FN > Mg

QUESTION 12** Three forces act on a ball of mass 2 kg as shown in the figure below. What is the magnitude of the acceleration of the ball? (There is no gravity in this problem.)

(a) (b) (c) (d) (e)

100 m/s2 200 m/s2 300 m/s2 400 m/s2 500 m/s2

QUESTION 13* This and the following question concern the same physical situation. A box of mass M slides down a frictionless inclined plane that makes an angle θ with the horizontal. What is the magnitude of the normal force acting on the box? (a) M g (b) M g cos(θ) (c) M g sin(θ)

QUESTION 14* What is the magnitude of the acceleration of the box? (a) g (b) g cos(θ) (c) g sin(θ)

QUESTION 15* A block of mass M rests on a horizontal frictionless tabletop. A string is attached to this block, passes over a pulley, and attaches to an identical block that hangs over the edge as shown in the figure. Since gravity pulls the hanging block downward, the blocks accelerate as shown. Which one of the following best describes the tension in the string? (a) T = Mg (b) T > Mg (c) T < Mg

QUESTION 16*

(a) (b) (c) (d) (e)

City B is directly north of City A, and a highway runs between them. You are piloting a plane that flies with a speed of VP,A = 200 km/h relative to the air. On a day when the wind is blowing from west to east at VA,G = 100 km/h relative to the ground, what direction θ do you need to point the nose of the plane such that you stay directly above the highway as you fly from A to B? θ = 5° west of north θ = 10° west of north θ = 20° west of north θ = 30° west of north θ = 45° west of north

QUESTION 17* A car is moving to the right. A pendulum is suspended from the ceiling and hangs as shown in the figure. What can we say about the speed of the car? (a) The car has a constant speed. (b) The car’s speed is increasing. (c) The car’s speed is decreasing.

QUESTION 18* This and the following question concern the same physical situation. A block of mass M = 4.0 kg is free to move on a horizontal frictionless surface, and is pulled with a rope that makes an angle of 30° with the horizontal as shown in the drawing below. The tension in the rope is 25 N. What is the acceleration of the block? (a) 4.41 m/s2 (b) 7.81 m/s2 (c) 2.24 m/s2 (d) 3.54 m/s2 (e) 5.41 m/s2

QUESTION 19** What is the magnitude of the normal force, FN, that acts on the block? (a) FN = Mg (b) FN < Mg (c) FN > Mg

QUESTION 20*

This and the following question concern the same physical situation. You apply a horizontal force of 500 N to a 100 kg box on a horizontal floor, and you observe that the box has an acceleration of a = 4 m/s2. What is the kinetic coefficient of friction μK between the box and the floor? (a) μK = 0.10 (b) μK = 0.15 (c) μK = 0.20 (d) μK = 0.25 (e) μK = 0.30

QUESTION 21* If the mass is doubled to 200 kg, but the applied force and the coefficient of friction remain the same, what will the acceleration anew of the box be? (a) anew = 2 m/s2 (b) anew > 2 m/s2 (c) anew < 2 m/s2

QUESTION 22* A sled is traveling at 3 m/s along a horizontal stretch of snow. The kinetic coefficient of friction between the sled and the snow is μK = 0.050. How far does the sled slide before stopping? (a) 5.1 m (b) 7.7 m (c) 8.5 m (d) 9.2 m (e) 11.6 m

QUESTION 23* This and the following question concern the same situation. For these two questions you can ignore the effect of gravity. A physics student ties a 0.5 kg rock to the end of a string and twirls it in a horizontal circle of radius 2 m. If the speed of the rock is 10 m/s, what is the tension T in the string? (a) T = 25 N (b) T = 50 N (c) T = 75 N (d) T = 100 N (e) T = 200 N

QUESTION 24* If the mass of the rock, the speed of the rock, and the radius of the circle, are all doubled, how will the new tension TNEW compare with the tension T found in the above problem? (a) TNEW = 2T (b) TNEW = 4T (c) TNEW = 8T

QUESTION 25* This and the following question concern similar situations. Suppose the distance of the satellite from the center of the earth is R = 108 m. Assuming that G = 6.7 × 10-11 N-m2/kg2 and that the mass of the earth is ME = 5.98 × 1024 kg, what is the speed of the satellite? (a) 1200 m/s (b) 1650 m/s (c) 2000 m/s (d) 2200 m/s (e) 2700 m/s

QUESTION 26* If the satellite instead orbited a new planet whose mass was half of the Earths mass, but the radius of the orbit was the same as in the above question, how would the speed of the satellite around this new planet be different from the speed in the above question. (a) The speed would be the same. (b) The speed would be bigger. (c) The speed would be smaller. 1) A vehicle travels a distance of 160 km in 5 hours. The average speed is (A) 32 km/hr (B) 40 km/hr (C) 80 km/hr (D) 165 km/hr (E) 800 km/hr Move mouse over for answer > 2) Which of the following is a scalar quantity? (A) Velocity (B) Retardation (C) Speed (D) Displacement (E) Acceleration

Move mouse over for answer > 3) A ball is dropped from rest. What is its speed after 3 seconds? (A) 15 m/s (B) 25 m/s (C) 30 m/s (D) 45 m/s (E) 90 m/s Move mouse over for answer > 4) A stone is dropped from rest from rest from the top of a tall building. The fraction (Distance fallen in the first 4 seconds) ------------------------------------------------(Distance fallen in the first 2 seconds) is approximately (A) ½ (B) ¼ (C) 2/1 (D) 4/1 (E) 16/1 Move mouse over for answer > 5) Which system gives the greatest acceleration? (A) 65N acting on 40 kg (B) 10N acting on 8 kg (C) 18N acting on 30 kg (D) 80N acting on 100 kg (E) 90N acting on 80 kg Move mouse over for answer > 6) An elastic spring doubles its unstretched length to 16cm without exceeding its elastic limit when a force of 28N is applied to it. When a force of 7N is applied, the length of the spring is (A) 2 cm (B) 4 cm (C) 7 cm (D) 8 cm (E) 10 cm Move mouse over for answer > 7) Which one of the following is not vector quantity? (A) Acceleration (B) Displacement (C) Force (D) Momentum (E) Speed

Move mouse over for answer > 8) How much work is done when a mass weighing 400N is lifted 3 meters? (A) None (B) 403 Nm (C) 1200J (D) 1200W (E) 133J Move mouse over for answer > 9) A block of wood is pulled along a horizontal bench at a constant speed of 15 m/s by a force of 8N. How much work is done against friction in 6 seconds? (A) 720J (B) 120J (C) 48J (D) 20J (E) 3.2J Move mouse over for answer >

10) What force, F, will be needed such that the uniform beam , pivoted at its middle point, will balance horizontally? (A) 100N (B) 300N (C) 400N (D) 900N (E) 1200N Move mouse over for answer > 11) Below the surface of a liquid the pressure acting in the liquid (A) Decreases as the depth increases (B) Increases as the depth increases (C) Is independent of the depth (D) Is the same for all liquids at a particular depth Move mouse over for answer > 12) A diving bell is to be used at great depths and so its walls are made very thick. The main reason for this is that (A) The water is much colder at great depths (B) Water pressure increases with depth of the water (C) The density of the water is much greater at great depths (D) Ice forms in deep water and could crush the bell (E) A thin-walled vessel would float up to the surface Move mouse over for answer > 13) The hydrostatic pressure on the dam wall at the bottom of a deep reservoir depends

upon the (A) Depth of the water (B) Surface area of the water (C) Length of the reservoir (D) Thickness of the wall (E) Density of the material of the dam wall Move mouse over for answer > 14) A metal rod expands by 1.00 mm when it is heated from 20 C to 80 C. Another rod of the same material, twice as long as the first at 20 C is heated from 20C to 50 C. The second rod will expand by (A) 0.25 mm (B) 0.50 mm (C) 1.00 mm (D) 2.00 mm (E) 4.00 mm Move mouse over for answer > 15) Which one of the following statements about expansion is correct? (A) Pyrex glass expands much less than ordinary glass under the same conditions. (B) Liquids do not expand when heated (C) Gases do not expand when heated (D) Water expands uniformly from 0 C upwards (E) Water expands when it melts Move mouse over for answer > 16) The clinical thermometer acts as one kind of maximum thermometer because it (A) Contains mercury (B) Have thick glass walls (C) Is rather short in length (D) Has a constriction at the bottom of its capillary tube (E) Has a very thin capillary tube Move mouse over for answer > 17) The bulb of a clinical thermometer is made of thin glass so that the (A) Mercury stays at its maximum reading (B) Thermometer is more accurate (C) Mercury is much easier to see (D) Mercury can absorb more heat (E) Thermometer quickly registers the temperature Move mouse over for answer > 18) In order to make a mercury-in-glass thermometer respond more quickly to changes in temperature its construction should be changed by (A) Making the bulb much larger (B) Using thicker glass walls around the bulb

(C) Making the capillary tube thinner (D) Using much thinner glass walls around the bulb (E) Opening the top of the capillary tube to the air Move mouse over for answer > 19) In which of the following units is specific heat capacity measured? (A) J s -1 (B) J K -1 (C) J kg -1 K-1 (D) J kg -1 (E) J m -3 Move mouse over for answer > 20) 2 kg of a substance of specific heat capacity c, and a piece of aluminum of mass 2m and specific heat capacity 2c each received the same quantity of heat. The temperature of the aluminum rose by 8 K. By how much did the temperature of the iron rise? (A) 2 K (B) 4 K (C) 8 K (D) 16 K (E) 32 K Move mouse over for answer > 21) Electric charge is measured in (A) Amperes (B) Volts (C) Joules (D) Watts (E) Coulombs Move mouse over for answer > 22) A volt may be defined as (A) A coulomb per second (B) A joule per second (C) An ampere per coulomb (D) A coulomb per joule (E) A joule per coulomb Move mouse over for answer > 23) Which of the following instruments is used to measure an electric current? (A) Voltmeter (B) Electrometer (C) Ohm-meter (D) Ammeter (E) Micrometer

Move mouse over for answer > 24) A piece of plastic is rubbed with a cloth and is then found to be negatively charged. The most likely explanation of this that (A) Cloths are always negatively charged (B) Plastic is always negatively charged (C) The cloth rubs electrons off the plastic (D) Positive ions are removed from the plastic (E) Electrons are transferred from the cloth to the plastic Move mouse over for answer > 25) Which one of the following is a magnetic material? (A) Manganese (B) Brass (C) Magnesium (D) Iron (E) Copper Move mouse over for answer > 26) A temporary magnet should be made from (A) Copper (B) Steel (C) Tin (D) Aluminum (E) Iron Move mouse over for answer > 27) A neutron has (A) No electric charge (B) A single positive charged (C) A double positive charge (D) A double negative charge (E) A single negative charge Move mouse over for answer > 28) The nucleus of the atom of a certain element contains 5 protons and 6 neutrons. Its mass number is (A) 5 (B) 6 (C) 11 (D) 12 (E) 17 Move mouse over for answer > 29) Isotopes of an element have (A) The same number of neutrons

(B) Different numbers of protons (C) The same physical properties (D) The same number of protons (E) Different number of electrons Move mouse over for answer > 30) Which of the following does not apply to sound waves? (A) They transmit energy (B) They result from vibration (C) They travel fastest in a vacuum (D) They can be diffracted (E) They are propagated by a series of compressions and rare fractions Move mouse over for answer > 31) Which of the following describes particles in a solid? (A) close together and stationary (B) close together and vibrating (C) close together and moving around at random (D) far apart and stationary (E) far apart and moving around at random Move mouse over for answer > 32) Which one of the following statement is correct? (A) the molecules in a solid are all at rest (B) the molecules in a solid are freely moving in all directions (C) the molecules in a liquids are on average much further apart than those in a solid (D) the molecules in a liquid move with limited freedom (E) there are no attractive forces between molecules in a liquid Move mouse over for answer > 33) Gas molecules enclosed in a sealed container exert a pressure by (A) vibrating about a fixed position (B) hitting and rebounding from the container wall (C) hitting and rebounding from each other (D) spinning about their centers (E) repelling one another strongly Move mouse over for answer > 34) For a fixed mass of gas, halving pressure (A) doubles the volume at constant temperature (B) doubles the volume if the temperature doubles also (C) halves the volume if the temperature halves also (D) does not affect the volume at constant temperature Move mouse over for answer >

35) Which of the following temperatures on the absolute (Kelvin) scale corresponds to 100 C°? (A) 0 K (B) 100 K (C) 273 K (D) 373 K (E) -273 K Move mouse over for answer > 36) The image formed in a plane mirror is (A) real and the same size as the object (B) real and nearly the same size as the object (C) virtual and the same size as the object (D) virtual and the half the size of the object Move mouse over for answer >

36) Two plane mirrors are supported with their surfaces at right angles and a small object is placed between them. How many reflected images of this object can be seen in the mirrors? (A) 1 (B) 2 (C) 3 (D) 4 (E) 5 Move mouse over for answer > 37) The image formed by a shaving or make-up mirror is (A) real and erect (B) real and inverted (C) virtual and erect (D) virtual and inverted (E) virtual and the same size as the object Move mouse over for answer > 38) In a dark room a red flag illuminated with blue light will appear (A) red (B) magenta (C) blue (D) black (E) yellow Move mouse over for answer > 39) When a convex lens is used as a magnifying glass the image is (A) real and upright (B) real and inverted

(C) virtual and upright (D) virtual and inverted (E) real and diminished Move mouse over for answer > 40) A longitudinal wave could be (A) a light wave (B) a radio wave (C) a wave on water (D) a sound wave in open air (E) a vibrating piano string Move mouse over for answer > 41) Which of the following types of waves has the highest frequencies? (A) X-rays (B) Infrared (C) Light (D) Ultraviolet (E) Radio Move mouse over for answer > 42) All sound is caused by (A) electromagnetism (B) electrically (C) transverse waves (D) sine waves (E) vibrations Move mouse over for answer > 43) In a medium where the velocity of sound is 45 m/s a source of frequency 150Hz will produce waves with a wavelength of (A) 0.3 m (B) 0.5 m (C) 3.0 m (D) 5.0 m (E) 10.0 m Move mouse over for answer > 44) A neutron has (A) no charge (B) a single positive charge (C) a double positive charge (D) a double negative charge (E) a single negative charge

Move mouse over for answer > 45) Which of the following is a magnetic material? (A) manganese (B) brass (C) iron (D) magnesium (E) copper Move mouse over for answer > 46) A temporary magnet is made from (A) copper (B) steel (C) tin (D) aluminum (E) iron Move mouse over for answer > 47) Which of the following instruments is used to measure an electric current? (A) voltmeter (B) electrometer (C) ohm-meter (D) ammeter (E) micrometer Move mouse over for answer > 48) A mains transformer working on 240V has 400 turns on the primary and 100 turns on the secondary. Assuming no power loss, the secondary output will be (A) 6 V (B) 12 V (C) 24 V (D) 960 V (E) 1440 V Move mouse over for answer > 49) Which of the following is not a correct statement about cathode rays? (A) they are deflected by an electric field (B) they are deflected by a magnetic field (C) they travel in straight lines (D) they are streams of electrons (E) they have a positive charge Move mouse over for answer > 50) An alpha particle consists of (A) 2 protons and 2 electrons (B) 4 protons

(C) 2 protons and 2 neutrons (D) 4 neutrons (E) 2 neutrons and 2 electrons Move mouse over for answer >