# SAT 2 Physics Full-length Practice Test 7: Part B

### Test Information

15 questions

12 minutes

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1. An electron is allowed to freely move between a pair of parallel plates that have a 1.5 volt potential difference. The electron starts at the negative plate. The velocity of the electron as it strikes the positive plate is most nearly

A. 7.3 × 10-8 m/s
B. 7.3 × 10-5 m/s
C. 7.3 × 105 m/s
D. 7.3 × 108 m/s
E. 7.3 × 1011 m/s

2. The half-life of a radioisotope is one week. How much of the substance is left after a 28-day period?

A. 1/2
B. 1/4
C. 1/8
D. 1/16
E. 1/32

3. All of the following are examples of electromagnetic waves EXCEPT

A. X-rays.
B. gamma rays.
C. sound waves.
E. light waves.

4. A batter hits a long fly ball. Neglecting air resistance, the baseball's horizontal component of speed is constant because it

A. is not acted upon by any forces.
B. is not acted upon by gravitational sources.
C. is not acted upon by any vertical forces.
D. is not acted upon by any horizontal forces.
E. the net forces acting on the baseball are zero.

5. Two spheres are placed into free fall from rest. Sphere B has a mass three times larger than sphere A. Which statement(s) correctly explains the situation?

I. Sphere B falls faster.

II. Sphere B has more momentum when the two reach the ground.

III. Both spheres reach the ground with the same kinetic energy.

A. I only
B. II only
C. I and III only
D. II and II only
E. I, II, and III

6. When Johannes Kepler developed his laws for the movement of planetary bodies, one of the laws stated that the orbits of the planets about the sun are

A. circular.
B. elliptical.
C. parabolic.
D. sinusoidal.
E. straight lines.

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

A. Change voltage
B. Reduce resistance
C. Decrease heat transfer
D. Increase magnetic fields
E. Reverse current flow

8. Astronomers can tell whether a star is approaching or receding from the earth by the

A. absorption spectra of the star.
B. Doppler shift of the starlight.
C. temperature of the star.
D. brightness of the starlight.
E. thermal signature of the star.

9. A batter hits a long fly ball. Neglecting friction, which of the following statements is/are true?

I. The time the ball is in free fall determines the horizontal distance it travels.

II. The ball reaches its maximum velocity at the highest point of its flight.

III. The upward velocity can never be greater than the horizontal velocity.

A. I only
B. II only
C. I and III only
D. II and III only
E. I, II, and III

10. Electromagnetic induction occurs in a wire when a change occurs in the

A. current in the wire.
B. intensity of the electric field of the wire.
C. voltage applied to the wire.
D. magnetic field intensity applied to the wire.
E. resistance is added to the wire.

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

A. conductivity.
B. number of protons.
C. temperature.
D. number of neutrons.
E. resistively.

12. A pile of 11 books weighing 2 N each is sitting on a table. With what total force does the table push back on the books?

A. 2N
B. 11N
C. 22N
D. 33N
E. 44N

13. Which of the following statements best describes the relationship between two objects that are in thermal equilibrium?

A. Their masses are equal.
B. Their volumes are equal.
C. Their density is equal.
D. Their heat content is equal.
E. Their temperatures are equal.

14. Two vectors X and Y are added together. Which of the following statements could be true?

I. The resultant magnitude is smaller than X.

II. The resultant magnitude is larger than Y.

III. The resultant direction is the same as either X or Y.

A. I only
B. II only
C. I and III only
D. II and III only
E. I, II, and III

15.

Five blocks having equal mass but made of different substances, as shown above, are heated to 100°C and placed on separate 10 kg blocks of ice that are at a temperature of 0°C. Which substance melts the greatest amount of ice?

A. The substance with the lowest specific heat.
B. The substance with the highest specific heat.
C. The substance with the greatest surface area.
D. The substance with the smallest surface area.
E. The substance that started with the highest temperature.

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