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Created by Master Student

Physics Practice Test #8

1 / 40

The volt is a measure of electrical potential and may be defined as

2 / 40

A string, fixed at both ends, supports a standing wave with a total of 4 nodes. If the length of the string is 6 m, what is the wavelength of the wave?

3 / 40

Which of the following must always be true? I. If an object's acceleration is constant, then it must move in a straight line. II. If an object's acceleration is zero, then its speed must remain constant. III. If an object's speed remains constant, then its acceleration must be zero.

4 / 40

All of the following are examples of electromagnetic waves EXCEPT

5 / 40

A uniform bar is lying on a flat table. Besides the gravitational and normal forces (which cancel), the bar is acted upon by exactly two other forces, F1 and F2, which are parallel to the surface of the table. If the net force on the rod is zero, then which one of the following is true?

6 / 40

A student uses a magnetic compass to perform a laboratory experiment in the Northern Hemisphere. She then carries the same magnetic compass with her to the Southern Hemisphere, taking care not to damage the compass in any way. When she reaches her destination at the equivalent latitude and longitude in the Southern Hemisphere, she prepares to perform the same laboratory experiment. The student looks at the compass before performing the experiment to see if the compass needle has changed. How has the compass changed?

7 / 40

A block of mass m = 4 kg on a frictionless, horizontal table is attached to one end of a spring of force constant k = 400 N/m and undergoes simple harmonic oscillations about its equilibrium position (x = 0) with amplitude A = 6 cm. If the block is at x = 6 cm at time t = 0, then which of the following equations (with x in centimeters and t in seconds) gives the block's position as a function of time?

8 / 40

A bicycle wheel spins on its axis at a constant rate but has not yet made a complete rotation. Which of the following statements is correct?

9 / 40

When a light ray strikes a perfectly reflective mirror at an angle, which of the following happens?

10 / 40

During a collision between two objects, the kinetic energy is conserved. Which statement best describes the momentum after the collision?

11 / 40

A light ray passes from a material of low refractive index to one of high refractive index. Which of the pairs of quantities listed below describes the light ray as it strikes and passes through the interface between the two materials? Match the descriptions below with the statement that best describes the situation. The light ray inside the material with the higher index of refraction bends toward the normal.

12 / 40

The planet Pluto has 1/500 the mass and 1/15 the radius of Earth. What is the value of g on the surface of Pluto?

13 / 40

Scientists can determine whether a star is approaching the earth by looking at its

14 / 40

A metal whose work function is 6.0 eV is struck with light of frequency 7.2e15 Hz. What is the maximum kinetic energy of photoelectrons ejected from the metal's surface?

15 / 40

An electric current is applied to a gas discharge tube, causing it to glow. When the discharge is viewed through a spectroscope, which type of spectrum is seen?

16 / 40

The processes of constructive interference and destructive interference occur in

17 / 40

What is the one factor that distinguishes each element from every other element?

18 / 40

How does one use the right hand rule to determine the direction of the force applied to a current carrying wire?

19 / 40

If 50g of water at a temperature of 30 degrees celsius is added to 200g of water at a temperature of 100 degrees celsius,what will the new temperature of the water be?

20 / 40

The images formed by convex mirrors

21 / 40

The force a magnetic field exerts on an electron is largest when the path of the electron is oriented

22 / 40

During a pool game the cue ball is shot at the red ball. When the cue ball strikes the red ball, the cue ball stops dead, and the red ball moves away at the same velocity the cue ball had before the collision. The type of collision represented in this example is

23 / 40

rue statements about the relationship between the electric field and electric potential include which of the following? I. If the electric field at a certain point is zero, then the electric potential at the same point is also zero. II. If the electric potential at a certain point is zero, then the electric field at the same point is also zero. III. The electric potential is inversely proportional to the strength of the electric field.

24 / 40

Protons are found in the nucleus of the atom. The nuclear protons with the greatest mass are located

25 / 40

Each and every person on earth is made of atoms that originated in

26 / 40

Two objects A and B are placed into free fall 14.7 m above the ground at exactly the same time. Object A reaches the ground in exactly 1 second, and object B reaches the ground in exactly 3 seconds. Which of the following is/are true? I. Object B was thrown horizontally. II. Both objects were thrown. III. Neither object was thrown.

27 / 40

Electrical energy is converted into mechanical energy by which of the following?

28 / 40

As a rock of mass 4 kg drops from the edge of a 40-meter-high cliff, it experiences air resistance, whose average strength during the descent is 20 N. At what speed will the rock hit the ground?

29 / 40

A laser beam passes from the air into a piece of plexiglass. All of the following are false EXCEPT

30 / 40

In Young's double-slit interference experiment, what is the difference in path length of the light waves from the two slits at the center of the first bright fringe above the central maximum?

31 / 40

Characteristics of simple harmonic motion include which of the following? I. The acceleration is constant. II. The restoring force is proportional to the displacement. III. The frequency is independent of the amplitude.

32 / 40

During each cycle, a heat engine with an efficiency of 25% takes in 800 J of energy. How much waste heat is expelled during each cycle?

33 / 40

The purpose of a transformer is to do which of the following?

34 / 40

The symbols used in writing nuclear equations. Atomic nuclei are typically written in the form . Which letter represents the name of the nuclide?

35 / 40

Whether a substance is a solid, liquid or gas is determined by

36 / 40

Through a series of thermodynamic processes, the internal energy of a sample of confined gas is increased by 560 J. If the net amount of work done on the sample by its surroundings is 320 J, how much heat was transferred between the gas and its environment?

37 / 40

Materials called dielectrics are placed between the plates of capacitors to

38 / 40

An astronaut is standing on an asteroid when he accidentally drops a wrench. He observes that the gravitational acceleration on the asteroid is 2.4 m/s2. If he had thrown the wrench at an upward angle instead, he would have found the gravitational acceleration on the asteroid to be

39 / 40

A 1,000 kg car rolls without friction down a hill that is 20 m long and inclined at 15 degrees celsius from the horizontal. What is the velocity of the car at the bottom of the hill?

40 / 40

Which provides the basis for the observation that the universe is expanding?