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Physics Final Flashcards

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1
Q

The preferred positive direction for angular displacement is the clockwise direction.

A

False

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2
Q

When a rigid body rotates about a fixed axis all the points in the body have the same angular displacement.

A

True

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3
Q

When a rigid body rotates about a fixed axis all the points in the body have the same angular speed.

A

True

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4
Q

When a rigid body rotates about a fixed axis all the points in the body have the same linear displacement.

A

False

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5
Q

When a rigid body rotates about a fixed axis all the points in the body have the same tangential speed.

A

False

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6
Q

When a rigid body rotates about a fixed axis all the points in the body have the same angular acceleration.

A

True

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7
Q

When a rigid body rotates about a fixed axis all the points in the body have the same tangential acceleration.

A

False

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8
Q

What is the quantity used to measure an object’s resistance to changes in rotational motion?

A

moment of inertia

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9
Q

A solid sphere, solid cylinder, and a hollow pipe all have equal masses and radi. If the three are released simultaneously at the top of an inclined plane, which will reach the bottom first?

A

sphere

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10
Q

Two children ride on a merry-go-round, George is at a greater distance from the axis of rotation than Jacques. It is a true statement that

A

Jacques and George have the same angular velocity.

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11
Q

Two children are riding on a merry-go-round. Child A is at a greater distance from the axis of rotation than child B. Which child has the larger linear displacement?

A

Child A

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12
Q

Two children are riding on a merry-go-round. Child A is at a greater distance from the axis of rotation than child B. Which child has the larger angular displacement?

A

They have the same non-zero angular displacement.

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13
Q

Two equal forces are applied to a door. The first force is applied at the midpoint of the door; the second force is applied at the doorknob. Both forces are applied perpendicular to the door. Which force exerts the greater torque?

A

the second at the doorknob

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14
Q

A person sits on a freely spinning lab stool (no friction). When this person extends her arms,

A

her moment of inertia increases and her angular velocity decreases.

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14
Q

An ice skater doing a spin pulls in her arms, decreasing her moment of inertia by a factor of two. How does her angular speed changes?

A

it increases by a factor of two.

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15
Q

A figure skater is spinning slowly with arms outstretched. She brings her arms in close to her body and her moment of inertia decreases by 1/2. Her angular speed increases by a factor of

A

2

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16
Q

A figure skater is spinning slowly with arms outstretched. She brings her arms in close to her body and her angular speed increases dramatically. The speed increase is a demonstration of

A

conservation of angular momentum: her moment of inertia is decreased, and so her angular speed must increase to conserve angular momentum.

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17
Q

A heavy boy and a lightweight girl are balanced on a massless seesaw. If they both move forward so that they are one-half their original distance from the pivot point, what will happen to the seesaw?

A

Nothing, the seesaw will still be balanced.

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18
Q

An ice skater doing a spin pulls in her arms, decreasing her moment of inertia by a factor of two, and doubling her angular speed. Her final rotational kinetic energy

A

is doubled.

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19
Q

A merry-go-round spins freely when Janice moves quickly to the center along a radius of the merry-go-round. It is true to say that

A

the moment of inertia of the system decreases and the angular speed increases.

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20
Q

An electrically neutral atom does not have a net charge.

A

True

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21
Q

A neutron carries a negative charge.

A

False

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22
Q

A neutron is approximately twice as heavy as the electron.

A

False

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23
Q

The coulomb, which is the unit of charge, is the charge on one electron.

A

False

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24
Q

Electric charge is quantized.

A

True

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25
Q

A good conductor of electricity is a bad conductor of heat.

A

False

25
Q

The Coulomb force between two charges can be attractive or repulsive.

A

True

26
Q

A positive charge placed in an electric field experiences a force in the direction of the field.

A

True

26
Q

When the distance between the two charges is doubled, the force between them is

A

reduced by a factor of 4.

27
Q

Two charges, Q1 and Q2, are separated by a certain distance. The ratio of charge @1 to charge 2 is
1:2. The ratio of force on @1 to the force on @2 is

A

1:1.

28
Q

The main difference between conductors and insulators is in terms of
so neutrons.

A

valence or conduction electrons.

28
Q

Two objects, A and B, are rubbed together. As a result, object A acquires an excess negative charge while object B becomes positively charged. In comparison to their masses before the charging process, you can say that

A

the mass of A increased and that of B decreased.

29
Q

Electrical and gravitational forces follow similar equations with one main difference:

A

Gravitational forces are always attractive but electrical forces can be attractive or repulsive.

30
Q

When atom A loses an electron to atom B,

A

atom A becomes a positive ion and atom B becomes a negative ion.

31
Q

The charge on the proton is the same as

A

The charge of an electron, but opposite sign

32
Q

The number of protons in the nucleus of an electrically neutral atom is equal to

A

the number of electrons surrounding the nucleus.

33
Q

Electric potential is a scalar quantity.

A

True

34
Q

When a proton moves in a direction of the electric field, its potential increases but its potential energy decreases.

A

True

34
Q

When an electron moves in a direction opposite to the electric field, its potential increases but the potential energy decreases.

A

True

35
Q

Unlike electric potential, the electric potential energy is a vector quantity.

A

False

35
Q

Conventional current is the flow of positive charge from higher to lower potential.

A

True

36
Q

Electron flow is in the direction of conventional current.

A

False

37
Q

A series circuit is a current divider and a parallel circuit is a voltage divider circuit.

A

False

38
Q

Four unequal resistors connected in series have same current but different voltages.

A

True

39
Q

Four equal resistors connected across a DC voltage source in either series or parallel will have equal voltage drops across each resistor.

A

True

40
Q

Four equal resistors connected in series have same current and same voltage across each resistor

A

True

41
Q

Which one of the following is the correct statement regarding the resistance?

A

The resistance of a wire is directly proportional to the length of the wire.

42
Q

The length of a certain wire is kept same while its radius is doubled. What is the change in the resistance of this wire?

A

It is reduced by a factor of 4.

43
Q

Four unequal resistors are connected in a parallel circuit. Which one of the following statements is correct about this circuit?

A

The total resistance is less than the smallest resistor.

44
Q

Four unequal resistors are connected in a series circuit. Which one of the following statements is correct about this circuit?

A

The total resistance is more than the largest resistor.

44
Q

Which of the following statements is correct?

A

The north pole of a magnet points towards the Earth’s geographic north pole.

45
Q

The field near a long straight wire carrying a current is inversely proportional to the current flowing through the wire.

A

False

45
Q

The magnetic field near a current carrying wire is directly proportional to the distance from the wire.

A

False

46
Q

A current carrying wire placed in a magnetic field perpendicular to the wire experiences a maximum force.

A

True

47
Q

At a given location the direction of the magnetic field is the direction that the north pole of a compass points when placed at that location.

A

True

48
Q

Magnetic field lines can never cross one another.

A

True

49
Q

Magnetic field lines come out of the south pole of a magnet and enter at the north pole.

A

False

49
Q

An electron moving in the positive y direction, at right angles to a magnetic field, experiences a magnetic force in the negative x direction. What is the direction of the magnetic field?

A

It is in the positive z direction.

50
Q

According to the law of reflection of light, the angle of incidence is

A

equal to the angle of reflection.

51
Q

Which one of the following is the correct number for the magnification of a plane mirror?

A

1.0

52
Q

The angle of reflection is the angle between

A

the reflected ray and the normal drawn at the point where this ray meets the mirror

53
Q

The angle of incidence is the angle between

A

the incident ray and the normal drawn at the point where this ray meets the mirror.

53
Q

The image formed in a plane mirror is

A

at the same distance behind the mirror as the object is in front of the mirror

54
Q

Which of the following sets of characteristics describes the image formed by a plane mirror?

A

virtual and upright

Physics (2 decks)

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